Wells Fargo & Company (WFC) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 25, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	WELLS FARGO & COMPANY/MN
Entity Central Index Key	72,971
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		4,872,873,834

Consolidated Statement of Incom

Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Interest income
Debt securities (1)(2)		$ 3,414	$ 3,173	[1],[2]
Mortgages held for sale (2)		179	182	[2]
Loans held for sale (1)		24	10	[1]
Loans		10,579	10,141
Equity investments		231	175	[1]
Other interest income (1)		920	532	[1]
Total interest income (2)		15,347	14,213	[2]
Interest expense
Deposits (2)		1,090	536	[2]
Short-term borrowings		311	114
Long-term debt (2)		1,576	1,147	[2]
Other interest expense		132	92
Total interest expense (2)		3,109	1,889	[2]
Net interest income (2)		12,238	12,324	[2]
Provision for credit losses		191	605
Net interest income after provision for credit losses		12,047	11,719
Noninterest income
Service charges on deposit accounts		1,173	1,313
Trust and investment fees		3,683	3,570
Card fees		908	945
Other fees		800	865
Mortgage banking		934	1,228
Insurance		114	277
Net gains from trading activities (1)		243	272	[1]
Net gains on debt securities (3)	[3]	1	36
Net gains from equity securities (1)(4)	[4]	783	570	[1]
Lease income		455	481
Other		602	374	[2]
Total noninterest income (2)		9,696	9,931	[2]
Noninterest expense
Salaries		4,363	4,261
Commission and incentive compensation		2,768	2,725
Employee benefits		1,598	1,686
Equipment		617	577
Net occupancy		713	712
Core deposit and other intangibles		265	289
FDIC and other deposit assessments		324	333
Other		4,394	3,209
Total noninterest expense		15,042	13,792
Income before income tax expense (2)		6,701	7,858	[2]
Income tax expense (2)		1,374	2,133	[2]
Net income before noncontrolling interests (2)		5,327	5,725	[2],[5]
Less: Net income from noncontrolling interests		191	91
Wells Fargo net income (2)		5,136	5,634	[2],[6]
Less: Preferred stock dividends and other		403	401
Wells Fargo net income applicable to common stock (2)		$ 4,733	$ 5,233	[2]
Per share information
Earnings per common share (in dollars per share)		$ 0.97	$ 1.05	[2]
Diluted earnings per common share (in dollars per share)		0.96	1.03	[2]
Dividends declared per common share (in dollars per share)		$ 0.39	$ 0.38
Average common shares outstanding (in shares)		4,885.7	5,008.6
Diluted average common shares outstanding (in shares)		4,930.7	5,070.4
[1]	(1)Financial information for the prior period has been revised to reflect the impact of the adoption of Accounting Standards Update (ASU) 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(3)Total other-than-temporary impairment (OTTI) losses were $17 million and $43 million for first quarter 2018 and 2017, respectively. Of total OTTI, losses of $10 million and $52 million were recognized in earnings, and losses (reversal of losses) of $7 million and $(9) million were recognized as non-credit-related OTTI in other comprehensive income for first quarter 2018 and 2017, respectively.
[4]	(4)Includes OTTI losses of $20 million and $77 million for first quarter 2018 and 2017, respectively.
[5]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[6]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

Consolidated Statement of Inco3

Consolidated Statement of Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Noninterest income
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Equity Securities and Nonmarketable Equity Securities	$ 20	$ 77
Debt securities [Member]
Noninterest income
Total OTTI losses (reversal of losses) recorded on debt securities	17	43
Total recorded as part of gross realized losses	10	52
Total reversal of losses recognized in OCI as non-credit-related impairment	$ 7	$ (9)

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Wells Fargo net income (2)		$ 5,136	$ 5,634	[1],[2]
Debt securities (1):
Net unrealized gains (losses) arising during the period	[3]	(3,443)	369
Reclassification of net (gains) losses to net income	[3]	68	(145)
Derivatives and hedging activities:
Net unrealized losses arising during the period (2)		(242)	(362)	[2]
Reclassification of net (gains) losses to net income		60	(202)
Defined benefit plans adjustments:
Net actuarial and prior service gains (losses) arising during the period		6	(7)
Amortization of net actuarial loss, settlements and other to net income		32	38
Foreign currency translation adjustments:
Net unrealized gains (losses) arising during the period		(2)	16
Other comprehensive loss, before tax (2)		(3,521)	(293)	[2]
Income tax benefit related to other comprehensive income (2)		862	123	[2]
Other comprehensive loss, net of tax (2)		(2,659)	(170)	[2]
Less: Other comprehensive income from noncontrolling interests (2)		0	14	[2]
Wells Fargo other comprehensive loss, net of tax (2)		(2,659)	(184)	[2]
Wells Fargo comprehensive income (2)		2,477	5,450	[2]
Comprehensive income from noncontrolling interests		191	105
Total comprehensive income (2)		$ 2,668	$ 5,555	[2]
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(1)Per the adoption of ASU 2016-01, the quarter ended March 31, 2018, reflects only net unrealized gains and reclassification of net gains to net income from debt securities. The quarter ended March 31, 2017, includes net unrealized gains from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million.

Consolidated Statement of Comp5

Consolidated Statement of Comprehensive Income (Unaudited) Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net unrealized gains (losses) arising during the period, Before tax	[1]	$ (3,443)	$ 369
Reclassification of net (gains) losses to net income, Before tax	[1]	68	$ (145)
Accounting Standards Update 2016-01 [Member]
Net unrealized gains (losses) arising during the period, Before tax		61
Reclassification of net (gains) losses to net income, Before tax		$ (116)
[1]	(1)Per the adoption of ASU 2016-01, the quarter ended March 31, 2018, reflects only net unrealized gains and reclassification of net gains to net income from debt securities. The quarter ended March 31, 2017, includes net unrealized gains from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million.

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks		$ 18,145	$ 23,367
Interest-earning deposits with banks (1)		184,250	192,580	[1]
Total cash, cash equivalents, and restricted cash (1)		202,395	215,947	[1]
Federal funds sold and securities purchased under resale agreements (1)		73,550	80,025	[1]
Debt securities:
Trading, at fair value (2)		59,866	57,624	[2]
Available-for-sale Securities, Debt Securities		271,656	276,407	[2]
Held-to-maturity, at cost (fair value $138,323 and $138,985)		141,446	139,335
Mortgages held for sale (includes $13,859 and $16,116 carried at fair value) (3)	[3]	17,944	20,070
Loans held for sale (includes $1,695 and $1,023 carried at fair value) (2)		3,581	1,131	[2]
Loans (includes $352 and $376 carried at fair value) (3)	[3]	947,308	956,770
Allowance for loan losses		(10,373)	(11,004)
Net loans		936,935	945,766
Mortgage servicing rights:
Measured at fair value		15,041	13,625
Amortized		1,411	1,424
Premises and equipment, net		8,828	8,847
Goodwill		26,445	26,587
Derivative assets		11,467	12,228
Equity securities (includes $35,561 and $39,227 carried at fair value) (2)		58,935	62,497	[2]
Other assets (2)		85,888	90,244	[2]
Total assets	[4]	1,915,388	1,951,757
Liabilities
Noninterest-bearing deposits		370,085	373,722
Interest-bearing deposits		933,604	962,269
Total deposits		1,303,689	1,335,991
Short-term borrowings		97,207	103,256
Derivative liabilities		7,883	8,796
Accrued expenses and other liabilities		73,397	70,615
Long-term debt		227,302	225,020
Total liabilities	[5]	1,709,478	1,743,678
Wells Fargo stockholders' equity:
Preferred stock		26,227	25,358
Common stock – $1-2/3 par value, authorized 9,000,000,000 shares; issued 5,481,811,474 shares		9,136	9,136
Additional paid-in capital		60,399	60,893
Retained earnings		147,928	145,263
Cumulative other comprehensive income (loss)		(4,921)	(2,144)
Treasury stock – 607,928,993 shares and 590,194,846 shares		(31,246)	(29,892)
Unearned ESOP shares		(2,571)	(1,678)
Total Wells Fargo stockholders' equity		204,952	206,936
Noncontrolling interests		958	1,143
Total equity		205,910	208,079
Total liabilities and equity		$ 1,915,388	$ 1,951,757
[1]	(1)Financial information has been revised to reflect the impact of the adoption of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[3]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.
[4]	(4)Our consolidated assets at March 31, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $111 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $13.0 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $28 million and $306 million; Other assets, $230 million and $342 million; and Total assets, $13.4 billion and $13.6 billion, respectively.
[5]	(5)Our consolidated liabilities at March 31, 2018, and December 31, 2017, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Derivative liabilities, $4 million and $5 million; Accrued expenses and other liabilities, $127 million and $132 million; Long-term debt, $947 million and $1.5 billion; and Total liabilities, $1.1 billion and $1.6 billion, respectively.

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Assets
Held-to-maturity, at fair value		$ 138,323	$ 138,985
Mortgages held for sale, carried at fair value		13,859	16,116
Loans held for sale, carried at fair value		1,695	1,023
Loans, carried at fair value		352	376
Equity investments, carried at fair value		35,561	39,227
Cash and due from banks		18,145	23,367
Net loans		936,935	945,766
Derivative assets		11,467	12,228
Other assets		85,888	90,244	[1]
Equity securities (includes $35,561 and $39,227 carried at fair value) (2)		58,935	62,497	[1]
Assets	[2]	1,915,388	1,951,757
Liabilities
Derivative liabilities		7,883	8,796
Accrued expenses and other liabilities		73,397	70,615
Long-term debt		227,302	225,020
Total liabilities	[3]	$ 1,709,478	$ 1,743,678
Wells Fargo stockholders' equity:
Common stock, par value		$ 1.666602371	$ 1.666602371
Common stock, shares issued		5,481,811,474	5,481,811,474
Common stock, shares authorized		9,000,000,000	9,000,000,000
Treasury stock, shares		607,928,993	590,194,846
Interest-earning deposits with banks (1)		$ 184,250	$ 192,580	[4]
VIEs that we consolidate [Member]
Assets
Cash and due from banks		111	116
Debt securities		0	0
Net loans		13,000	12,500
Derivative assets		0	0
Other assets		230	342
Equity securities (includes $35,561 and $39,227 carried at fair value) (2)		28	306
Assets		13,384	13,617
Liabilities
Derivative liabilities		4	5
Accrued expenses and other liabilities		127	132
Long-term debt		947	1,479
Total liabilities		1,078	1,616
Wells Fargo stockholders' equity:
Interest-earning deposits with banks (1)		$ 8	$ 371
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(4)Our consolidated assets at March 31, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $111 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $13.0 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $28 million and $306 million; Other assets, $230 million and $342 million; and Total assets, $13.4 billion and $13.6 billion, respectively.
[3]	(5)Our consolidated liabilities at March 31, 2018, and December 31, 2017, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Derivative liabilities, $4 million and $5 million; Accrued expenses and other liabilities, $127 million and $132 million; Long-term debt, $947 million and $1.5 billion; and Total liabilities, $1.1 billion and $1.6 billion, respectively.
[4]	(1)Financial information has been revised to reflect the impact of the adoption of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions		Total		Total Wells Fargo stockholders' equity [Member]	Preferred stock [Member]	Common stock [Member]	Additional paid-in capital [Member]	Retained Earnings [Member]	Cumulative other comprehensive income [Member]	Treasury stock [Member]	Unearned ESOP Shares [Member]	Noncontrolling interests [Member]
Stockholders' Equity Period Increase (Decrease)
Transition Adjustment | Accounting Standards Update 2017-12 [Member]	[1]	$ (213)		$ (213)				$ (381)	$ 168
Beginning balance, adjusted balance		200,284		199,368	$ 24,551	$ 9,136	$ 60,234	132,694	(2,969)	$ (22,713)	$ (1,565)	$ 916
Beginning balance at Dec. 31, 2016		200,497		199,581	$ 24,551	$ 9,136	60,234	133,075	(3,137)	(22,713)	(1,565)	916
Beginning balance, shares at Dec. 31, 2016					11,532,712	5,016,109,326
Stockholders' Equity Period Increase (Decrease)
Net income		5,634	[2],[3]	5,634				5,634
Net income attributable to noncontrolling interests		91										91
Net income	[2],[4]	5,725
Other comprehensive income (loss) attributable to parent, net of tax		(184)	[3]	(184)					(184)
Other comprehensive income (loss) attributable to noncontrolling interest, net of tax		14	[3]									14
Other comprehensive income (loss), net of tax	[3]	(170)
Noncontrolling interests, adjustments to Additional Paid in Capital				2			2
Noncontrolling interests												(32)
Total change in noncontrolling interests		(30)
Common stock issued		1,406		1,406			3	(184)		1,587
Common stock, shares issued						33,699,497
Common stock repurchased		(2,175)		(2,175)			750			(2,925)
Common stock repurchased, shares						(53,074,224)
Preferred stock issued to ESOP		0		0	$ 950		31				(981)
Preferred stock issued to ESOP, shares					950,000
Preferred stock released by ESOP		0		0			0				0
Preferred stock converted to common shares		0		0	$ 0		0			0
Preferred stock converted to common shares, shares					0	0
Common stock warrants repurchased/exercised		(44)		(44)			(44)
Preferred stock issued		0		0	$ 0		0
Preferred stock, shares issued					0
Common stock dividends		(1,903)		(1,903)			12	(1,915)
Preferred stock dividends		(401)		(401)				(401)
Stock incentive compensation expense		389		389			389
Net change in deferred compensation and related plans		(771)		(771)			(792)			21
Net change		2,026		1,953	$ 950	$ 0	351	3,134	(184)	(1,317)	(981)	73
Net change, shares					950,000	(19,374,727)
Ending balance at Mar. 31, 2017		202,310		201,321	$ 25,501	$ 9,136	60,585	135,828	(3,153)	(24,030)	(2,546)	989
Ending balance, shares at Mar. 31, 2017					12,482,712	4,996,734,599
Stockholders' Equity Period Increase (Decrease)
Transition Adjustment | Accounting Standards Update 2016-01 [Member]	[5]	(24)		(24)				94	(118)
Beginning balance, adjusted balance		208,055		206,912	$ 25,358	$ 9,136	60,893	145,357	(2,262)	(29,892)	(1,678)	1,143
Beginning balance at Dec. 31, 2017		208,079		206,936	$ 25,358	$ 9,136	60,893	145,263	(2,144)	(29,892)	(1,678)	1,143
Beginning balance, shares at Dec. 31, 2017					11,677,235	4,891,616,628
Stockholders' Equity Period Increase (Decrease)
Net income		5,136		5,136				5,136
Net income attributable to noncontrolling interests		191										191
Net income		5,327
Other comprehensive income (loss) attributable to parent, net of tax		(2,659)		(2,659)					(2,659)
Other comprehensive income (loss) attributable to noncontrolling interest, net of tax		0
Other comprehensive income (loss), net of tax		(2,659)
Noncontrolling interests, adjustments to Additional Paid in Capital				7			7
Noncontrolling interests												(376)
Total change in noncontrolling interests		(369)
Common stock issued		1,208		1,208			25	(231)		1,414
Common stock, shares issued						28,425,759
Common stock repurchased		(3,029)		(3,029)			0			(3,029)
Common stock repurchased, shares						(50,567,457)
Preferred stock issued to ESOP		0		0	$ 1,100		43				(1,143)
Preferred stock issued to ESOP, shares					1,100,000
Preferred stock released by ESOP		231		231			(19)				250
Preferred stock converted to common shares		0		0	$ (231)		5			226
Preferred stock converted to common shares, shares					(231,000)	4,407,551
Common stock warrants repurchased/exercised		(157)		(157)			(157)
Preferred stock issued		0		0
Preferred stock, shares issued
Common stock dividends		(1,911)		(1,911)			13	(1,924)
Preferred stock dividends		(410)		(410)				(410)
Stock incentive compensation expense		437		437			437
Net change in deferred compensation and related plans		(813)		(813)			(848)			35
Net change		(2,145)		(1,960)	$ 869	$ 0	(494)	2,571	(2,659)	(1,354)	(893)	(185)
Net change, shares					869,000	(17,734,147)
Ending balance at Mar. 31, 2018		$ 205,910		$ 204,952	$ 26,227	$ 9,136	$ 60,399	147,928	$ (4,921)	$ (31,246)	$ (2,571)	$ 958
Ending balance, shares at Mar. 31, 2018					12,546,235	4,873,882,481
Stockholders' Equity Period Increase (Decrease)
Transition Adjustment | Accounting Standards Update 2016-01 [Member]								$ 106
[1]	(1)Effective January 1, 2017, we adopted changes in hedge accounting pursuant to ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[4]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[5]	(2)Effective January 1, 2018, we adopted ASU 2016-04 – Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products, ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, and ASU 2014-09 – Revenue from Contracts With Customers (Topic 606) and subsequent related Updates. See Note 1 (Summary of Significant Accounting Policies) in this Report for more information.

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Cash flows from operating activities:
Net income before noncontrolling interests (2)	$ 5,327		$ 5,725	[1],[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	191		605
Changes in fair value of MSRs, MHFS and LHFS carried at fair value	(788)		8
Depreciation, amortization and accretion	1,431		1,237
Other net (gains) (1)(2)	(2,309)		(1,158)	[2],[3]
Stock-based compensation	792		740
Originations and purchases of mortgage held for sale (1)	(38,460)		(37,664)	[3]
Proceeds from sales of and paydowns on mortgages originated for sale (1)	31,236		25,269	[3]
Net change in:
Debt and equity securities, held for trading (1)	10,861		14,628	[3]
Loans held for sale (1)	(602)		202	[3]
Deferred income taxes	484		1,007
Derivative assets and liabilities (2)	(20)		(709)	[2]
Other assets (2)	3,331		3,618	[2]
Other accrued expenses and liabilities (2)	3,756		(370)	[2]
Net cash provided by operating activities	15,230		13,138
Net change in:
Federal funds sold and securities purchased under resale agreements (3)	4,566		(12,395)	[4]
Available-for-sale debt securities:
Proceeds from sales (1)	3,458		3,023	[3]
Prepayments and maturities	6,909		11,016
Purchases	(14,179)		(14,495)
Held-to-maturity debt securities:
Paydowns and maturities	2,304		1,470
Equity securities, not held for trading:
Proceeds from sales and capital returns (1)	1,920		1,533	[3]
Purchases (1)	(1,234)		(698)	[3]
Loans:
Loans originated by banking subsidiaries, net of principal collected (4)	1,238		5,123	[5]
Proceeds from sales (including participations) of loans held for investment	3,803		2,504
Purchases (including participations) of loans	(268)		(1,148)
Principal collected on nonbank entities’ loans (4)	2,210		2,788	[5]
Loans originated by nonbank entities (4)	(1,655)		(1,927)	[5]
Net cash paid for acquisitions	0		(46)
Proceeds from sales of foreclosed assets and short sales	935		1,519
Other, net	154		(166)
Net cash provided (used) by investing activities	10,161		(1,899)
Net change in:
Deposits	(32,276)		19,365
Short-term borrowings	(5,165)		(1,064)
Long-term debt:
Proceeds from issuance	15,517		12,975
Repayment	(11,625)		(11,937)
Preferred stock:
Cash dividends paid	(418)		(408)
Common stock:
Proceeds from issuance	382		572
Stock tendered for payment of withholding taxes (1)	(307)		(359)
Repurchased	(3,029)		(2,175)
Cash dividends paid	(1,867)		(1,859)
Net change in noncontrolling interests	(113)		(30)
Other, net	(42)		(29)
Net cash provided (used) by financing activities	(38,943)		15,051
Net change in cash, cash equivalents, and restricted cash (3)	(13,552)		26,290	[4]
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period (3)	215,947	[6]	221,043	[4]
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period (3)	202,395		247,333	[4]
Supplemental cash flow disclosures:
Cash paid for interest	3,002		1,612
Cash paid for income taxes	$ 158		$ 215
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(1)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[4]	(3)Financial information has been revised to reflect the impact of the adoption of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.
[5]	(4)Prior periods have been revised to reflect classification changes due to entity restructuring activities
[6]	(1)Financial information has been revised to reflect the impact of the adoption of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1: Summary of Significant Accounting Policies Wells Fargo & Company is a diversified financial services company. We provide banking, trust and investments, mortgage banking, investment banking, retail banking, brokerage, and consumer and commercial finance through banking locations, the internet and other distribution channels to consumers, businesses and institutions in all 50 states, the District of Columbia, and in foreign countries. When we refer to “Wells Fargo,” “the Company,” “we,” “our” or “us,” we mean Wells Fargo & Company and Subsidiaries (consolidated). Wells Fargo & Company (the Parent) is a financial holding company and a bank holding company. We also hold a majority interest in a real estate investment trust, which has publicly traded preferred stock outstanding. Our accounting and reporting policies conform with U.S. generally accepted accounting principles (GAAP) and practices in the financial services industry. For discussion of our significant accounting policies, see Note 1 (Summary of Significant Accounting Policies) in our Annual Report on Form 10-K for the year ended December 31, 2017 ( 2017 Form 10-K). To prepare the financial statements in conformity with GAAP, management must make estimates based on assumptions about future economic and market conditions (for example, unemployment, market liquidity, real estate prices, etc.) that affect the reported amounts of assets and liabilities at the date of the financial statements, income and expenses during the reporting period and the related disclosures. Although our estimates contemplate current conditions and how we expect them to change in the future, it is reasonably possible that actual conditions could be worse than anticipated in those estimates, which could materially affect our results of operations and financial condition. Management has made significant estimates in several areas, including: • allowance for credit losses (Note 6 (Loans and Allowance for Credit Losses)); • valuations of residential mortgage servicing rights (MSRs) (Note 9 (Securitizations and Variable Interest Entities) and Note 10 (Mortgage Banking Activities)) and financial instruments (Note 15 (Fair Values of Assets and Liabilities)); • liabilities for contingent litigation losses (Note 13 (Legal Actions)); and • income taxes. Actual results could differ from those estimates. These unaudited interim financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the periods presented. These adjustments are of a normal recurring nature, unless otherwise disclosed in this Form 10-Q. The results of operations in the interim financial statements do not necessarily indicate the results that may be expected for the full year. The interim financial information should be read in conjunction with our 2017 Form 10-K. Accounting Standards Adopted in 2018 In first quarter 2018 , we adopted the following new accounting guidance: • Accounting Standards Update (ASU or Update) 2017-09 – Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting; • ASU 2017-07 – Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost; • ASU 2017-05 – Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets; • ASU 2017-01 – Business Combinations (Topic 805): Clarifying the Definition of a Business; • ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash; • ASU 2016-16 – Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory; • ASU 2016-15 – Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; • ASU 2016-04 – Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products; • ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities; and • ASU 2014-09 – Revenue from Contracts With Customers (Topic 606) and subsequent related Updates. ASU 2017-09 clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the ASU, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The Update is applied to awards modified on or after the adoption date and accordingly, did not have a material impact on our consolidated financial statements. ASU 2017-07 requires that the service cost component of net benefit cost be reported in the same line item as other compensation costs arising from services rendered by employees during the period, and the other pension cost components (interest cost, expected return on plan assets and amortization of actuarial gains and losses) be presented in the income statement separate from the service cost component. The income statement line item used to present the other pension cost components must be disclosed. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements. ASU 2017-05 provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The ASU applies to nonfinancial assets, including real estate (e.g., buildings, land, windmills, solar farms), ships and intellectual property. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements. ASU 2017-01 requires that when substantially all of the fair value of gross assets acquired is concentrated in a single asset (or a group of similar assets), the assets acquired would not represent a business. The Update is applied prospectively and accordingly, did not have a material impact on our consolidated financial statements. ASU 2016-18 requires that restricted cash and cash equivalents are included with the total cash and cash equivalents in the consolidated statement of cash flows. In addition, the nature of any restrictions will be disclosed in the footnotes to the financial statements. We adopted this change in first quarter 2018. Our retrospective adoption includes changes to our presentation of cash and cash equivalents in our consolidated statement of cash flows to include both cash and due from banks as well as interest-earning deposits with banks. In addition, we had corresponding changes on our consolidated balance sheets. ASU 2016-16 requires us to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the period in which the transfer occurs. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements. ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice for reporting in the statement of cash flows. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements. ASU 2016-04 modifies the accounting for certain prepaid card products to require the recognition of breakage. Breakage represents the estimated amount that will not be redeemed by the cardholder for goods or services. We adopted this change in first quarter 2018. Upon adoption, we recorded a cumulative-effect adjustment that increased retained earnings, given estimated breakage, by $20 million . ASU 2016-01 changes the accounting for certain equity securities to record at fair value with unrealized gains or losses reflected in earnings, as well as improve the disclosures of equity securities and the fair value of financial instruments. The Update also requires that for purposes of disclosing the fair value of financial instruments recorded at amortized cost, including loans and long-term debt, the valuation methodology is based on an exit price notion. We adopted the Update in first quarter 2018 and recorded a cumulative-effect adjustment as of January 1, 2018, that increased retained earnings by $106 million as a result of a transition adjustment to reclassify $118 million in net unrealized gains from other comprehensive income to retained earnings, partially offset by a transition adjustment to decrease retained earnings by $12 million primarily to adjust the carrying value of our auction rate securities from cost to fair value. No transition adjustment was recorded for investments changed to the measurement alternative (described below), which was applied prospectively. As a result of adopting this ASU, our investments in marketable equity securities, including those previously classified as available-for-sale, are accounted for at fair value with unrealized gains or losses reflected in earnings. Additionally, our share of unrealized gains or losses related to marketable equity securities held by our equity method investees are reflected in earnings. Prior to adoption, such unrealized gains and losses were reflected in other comprehensive income. Our investments in nonmarketable equity securities previously accounted for under the cost method of accounting, except for federal bank stock, are now accounted for either at fair value with unrealized gains and losses reflected in earnings or using the measurement alternative. The measurement alternative is similar to the cost method of accounting, except the carrying value is adjusted through earnings for impairment, if any, and changes in observable and orderly transactions in the same or similar investment. We account for substantially all of our private equity securities, previously using the cost method of accounting, now under the measurement alternative. Our auction rate securities portfolio is now accounted for at fair value with unrealized gains or losses reflected in earnings. In connection with our adoption of this Update, we have modified our balance sheet and income statement presentation to report marketable and nonmarketable equity securities and their results separately from debt securities by now reporting all equity securities in a new line labeled “Equity securities” in both the balance sheet and income statement. Additionally we now report loans held for trading purposes in loans held for sale and have reclassified net gains and losses on marketable equity securities used as economic hedges of deferred compensation obligations from “Net gains for trading activities” to “Net gains from equity securities”. All prior periods have been revised to conform to these changes in reporting. Table 1.1 provides a summary of our reporting changes implemented in connection with our adoption of ASU 2016-01. Table 1.1: Summary of Reporting Changes Financial instrument or transaction type As previously reported Revised reporting Balance Sheet Marketable equity securities Trading assets and available for sale investment securities Equity securities (new caption) Nonmarketable equity securities Other assets Equity securities (new caption) Loans held for trading Trading assets Loans held for sale Debt securities held for trading Trading assets Debt securities (formerly “Investment securities”) Income Statement Interest income: Marketable equity securities Trading assets and investment securities Equity securities (new caption) Nonmarketable equity securities Other Equity securities (new caption) Loans held for trading Trading assets Loans held for sale Debt securities held for trading Trading assets Debt securities (formerly “Investment securities”) Noninterest income: Deferred compensation gains (1) Net gains from trading activities Net gains from equity securities (1) Reclassification of net gains and losses on marketable equity securities economically hedging our deferred compensation obligations. Table 1.2 summarizes financial assets and liabilities by form and measurement accounting model. Table 1.2: Accounting Model for Financial Assets and Liabilities Balance sheet caption Measurement model(s) Financial statement Note reference Cash and due from banks Cost N/A Interest-earning deposits with banks Cost N/A Federal funds sold and securities purchased under resale agreements Amortized cost N/A Debt securities: Trading FV-NI (1) Note 4: Trading Activities Available-for-sale FV-OCI (2) Note 5: Debt Securities Held-to-maturity Amortized cost Note 5: Debt Securities Mortgages held for sale FV-NI (1) LOCOM (3) Note 15: Fair Values of Assets and Liabilities Loans held for sale FV-NI (1) Note 15: Fair Values of Assets and Liabilities Loans Amortized cost FV-NI (1) Note 6: Loans and Allowance for Credit Losses Derivative assets and liabilities FV-NI (1) FV-OCI (2) Note 4: Trading Activities Equity securities: Marketable FV-NI (1) Note 4: Trading Activities Note 15: Fair Values of Assets and Liabilities Nonmarketable FV-NI (1) Cost method Equity method MA (4) Note 4: Trading Activities Other assets Amortized cost (5) Note 8: Other Assets Deposits Amortized cost N/A Short-term borrowings Amortized cost N/A Long-term debt Amortized cost N/A (1) FV-NI represents the fair value through net income accounting model. (2) FV-OCI represents the fair value through other comprehensive income accounting model. (3) LOCOM represents the lower of cost or market accounting model. (4) MA represents the measurement alternative accounting model. (5) Other assets are generally carried at amortized cost, except for bank-owned life insurance which is carried at cash surrender value. ASU 2014-09 modifies the guidance used to recognize revenue from contracts with customers for transfers of goods or services and transfers of non-financial assets, unless those contracts are within the scope of other guidance. Upon a modified retrospective adoption, we recorded a cumulative-effect adjustment that decreased retained earnings by $32 million , due to changes in the timing of revenue for corporate trust services that are provided over the life of the associated trust. In addition, we changed the presentation of some costs such that underwriting expenses of our broker-dealer business that were previously netted against revenue are now included in noninterest expense, and card payment network charges that were previously included in noninterest expense are now netted against card fee revenue. Private Share Repurchases From time to time we enter into private forward repurchase transactions with unrelated third parties to complement our open-market common stock repurchase strategies, to allow us to manage our share repurchases in a manner consistent with our capital plans submitted annually under the Comprehensive Capital Analysis and Review (CCAR) and to provide an economic benefit to the Company. Our payments to the counterparties for these contracts are recorded in permanent equity in the quarter paid and are not subject to re-measurement. The classification of the up-front payments as permanent equity assures that we have appropriate repurchase timing consistent with our capital plans, which contemplate a fixed dollar amount available per quarter for share repurchases pursuant to Federal Reserve Board (FRB) supervisory guidance. In return, the counterparty agrees to deliver a variable number of shares based on a per share discount to the volume-weighted average stock price over the contract period. There are no scenarios where the contracts would not either physically settle in shares or allow us to choose the settlement method. Our total number of outstanding shares of common stock is not reduced until settlement of the private share repurchase contract. We had no unsettled private share repurchase contracts at both March 31, 2018 and March 31, 2017 . Supplemental Cash Flow Information Significant noncash activities are presented in Table 1.3. Table 1.3: Supplemental Cash Flow Information Quarter ended March 31, (in millions) 2018 2017 Trading debt securities retained from securitization of MHFS $ 8,776 20,929 Transfers from loans to MHFS 1,297 1,657 Transfers from loans to LHFS 1,973 479 Transfers from available-for-sale debt securities to held-to-maturity debt securities 4,451 9,897 Subsequent Events We have evaluated the effects of events that have occurred subsequent to March 31, 2018 , and there have been no material events that would require recognition in our first quarter 2018 consolidated financial statements or disclosure in the Notes to the consolidated financial statements, except that on April 20, 2018, we reached an agreement with the Consumer Financial Protection Bureau (CFPB) and Office of the Comptroller of the Currency (OCC) to pay a total of $1 billion in civil money penalties to resolve matters regarding our compliance risk management program and our past practices involving certain automobile collateral protection insurance policies and certain mortgage interest rate lock extensions (the “CFPB/OCC matter”). This agreement was considered to be a recognizable subsequent event under GAAP and required adjustment to our first quarter 2018 consolidated financial statements. Accordingly, we provided for an additional legal accrual that increased operating losses within noninterest expense by $800 million and, as a result, reduced net income for the quarter ended March 31, 2018, by $800 million , or $0.16 per diluted common share. See Note 13 (Legal Actions) for additional information.

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Business Combinations	Note 2: Business Combinations We regularly explore opportunities to acquire financial services companies and businesses. Generally, we do not make a public announcement about an acquisition opportunity until a definitive agreement has been signed. For information on additional contingent consideration related to acquisitions, which is considered to be a guarantee, see Note 12 (Guarantees, Pledged Assets and Collateral, and Other Commitments). We completed no acquisitions during first quarter 2018 and had no business combinations pending as of March 31, 2018. In February 2018, we completed the sale of Wells Fargo Shareowner Services.

Cash, Loan and Dividend Restric

Cash, Loan and Dividend Restrictions	3 Months Ended
	Mar. 31, 2018
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Cash, Loan and Dividend Restrictions	Note 3: Cash, Loan and Dividend Restrictions Cash and cash equivalents may be restricted as to usage or withdrawal. Federal Reserve Board (FRB) regulations require that each of our subsidiary banks maintain reserve balances on deposit with the Federal Reserve Banks. Table 3.1 provides a summary of restrictions on cash equivalents in addition to the FRB reserve cash balance requirements . Table 3.1: Nature of Restrictions on Cash Equivalents (in millions) Mar 31, Dec 31, Average required reserve balance for FRB (1) $ 12,025 12,306 Reserve balance for non-U.S. central banks 427 617 Segregated for benefit of brokerage customers under federal and other brokerage regulations 574 666 Related to consolidated variable interest entities (VIEs) that can only be used to settle liabilities of VIEs 119 487 (1) FRB required reserve balance represents average for first quarter 2018 and for the year ended December 31, 2017 . We are subject to additional loan and dividend restrictions. We have a state-chartered subsidiary bank that is subject to state regulations that limit dividends. Under these provisions and regulatory limitations, our national and state-chartered subsidiary banks could have declared additional dividends of $14.2 billion at March 31, 2018 , without obtaining prior regulatory approval. Our nonbank subsidiaries are also limited by certain federal and state statutory provisions and regulations covering the amount of dividends that may be paid in any given year. I n addition, under a Support Agreement dated June 28, 2017, among Wells Fargo & Company, the parent holding company (the “Parent”), WFC Holdings, LLC, an intermediate holding company and subsidiary of the Parent (the “IHC”), and Wells Fargo Bank, N.A., Wells Fargo Securities, LLC, and Wells Fargo Clearing Services, LLC, each an indirect subsidiary of the Parent, the IHC may be restricted from making dividend payments to the Parent if certain liquidity and/or capital metrics fall below defined triggers. Based on retained earnings at March 31, 2018, our nonbank subsidiaries could have declared additional dividends of $24.8 billion at March 31, 2018 , without obtaining prior regulatory approval. For additional information see Note 3 ( Cash, Loan and Dividend Restrictions) in our 2017 Form 10-K. The FRB’s Capital Plan Rule (codified at 12 CFR 225.8 of Regulation Y) establishes capital planning and prior notice and approval requirements for capital distributions including dividends by certain large bank holding companies. The FRB has also published guidance regarding its supervisory expectations for capital planning, including capital policies regarding the process relating to common stock dividend and repurchase decisions in the FRB’s SR Letter 15-18. The effect of this guidance is to require the approval of the FRB (or specifically under the Capital Plan Rule, a notice of non-objection) for the Company to repurchase or redeem common or perpetual preferred stock as well as to raise the per share quarterly dividend from its current level of $0.39 per share as declared by the Company’s Board of Directors on April 24, 2018, payable on June 1, 2018.

Trading Activities

Trading Activities	3 Months Ended
	Mar. 31, 2018
Trading Activities [Abstract]
Trading Activities	Note 4: Trading Activities We engage in trading activities to accommodate the investment and risk management activities of our customers. These activities predominantly occur in our Wholesale Banking businesses and to a lesser extent other divisions of the Company. Assets and liabilities associated with our trading activities include debt and equity securities, derivatives, loans and short sales. Our trading assets and liabilities are carried on the balance sheet at fair value with changes in fair value recognized in net gains from trading activities and interest income and interest expense recognized in net interest income. Table 4.1 presents a summary of our trading assets and liabilities measured at fair value through earnings . Table 4.1: Trading Assets and Liabilities Mar 31, Dec 31, (in millions) 2018 2017 Trading assets: Debt securities $ 59,866 57,624 Equity securities 25,327 30,004 Loans held for sale 1,695 1,023 Gross trading derivative assets 30,644 31,340 Netting (1) (20,112 ) (19,629 ) Total trading derivative assets 10,532 11,711 Total trading assets 97,420 100,362 Trading liabilities: Short sale 23,303 18,472 Gross trading derivative liabilities 29,717 31,386 Netting (1) (22,569 ) (23,062 ) Total trading derivative liabilities 7,148 8,324 Total trading liabilities $ 30,451 26,796 (1) Represents balance sheet netting for trading derivative asset and liability balances, and trading portfolio level counterparty valuation adjustments. Table 4.2 provides a summary of the net interest income earned from trading securities, and net gains and losses due to the realized and unrealized gains and losses from trading activities. Table 4.2: Net Interest Income and Net Gains (Losses) on Trading Activities Quarter ended March 31, (in millions) 2018 2017 Interest income (1): Debt securities $ 631 513 Equity securities 141 114 Loans held for sale 8 9 Total interest income 780 636 Less: Interest expense (2) 128 93 Net interest income 652 543 Net gains (losses) from trading activities: Debt securities (499 ) 149 Equity securities (469 ) 927 Loans held for sale 8 24 Derivatives (3) 1,203 (828 ) Total net gains from trading activities (4) 243 272 Total trading-related net interest and noninterest income $ 895 815 (1) Represents interest and dividend income earned on trading securities. (2) Represents interest and dividend expense incurred on trading securities we have sold but have not yet purchased. (3) Excludes economic hedging of mortgage banking and asset/liability management activities, for which hedge results (realized and unrealized) are reported with the respective hedged activities. (4) Represents realized gains (losses) from our trading activities and unrealized gains (losses) due to changes in fair value of our trading positions, attributable to the type of asset or liability. Customer accommodation trading activities include our actions as an intermediary to buy and sell financial instruments and market-making activities. We also take positions to manage our exposure to customer accommodation activities. We hold financial instruments for trading in long positions (assets), as well as short positions where we sold financial instruments we have not yet purchased (liabilities), to facilitate our trading activities. As an intermediary we interact with market buyers and sellers to facilitate the purchase and sale of financial instruments to meet the anticipated or current needs of our customers. For example, we may purchase or sell a derivative to a customer who wants to manage interest rate risk exposure. We typically enter into an offsetting derivative or security position to manage our exposure to the customer transaction. We earn income based on the transaction price difference between the customer transaction and the offsetting position, which is reflected in the fair value changes of the positions recorded in the net gains from trading activities. Our market-making activities include taking long and short trading positions to facilitate customer order flow. These activities are typically executed on a short term basis. As a market-maker we earn income due to: (1) difference between the price paid or received for the purchase and sale of the security (bid-ask spread), (2) the net interest income of the positions, and (3) the changes in fair value of the trading positions held on our balance sheet. Additionally, we may enter into separate derivative or security positions to manage our exposure related to our long and short trading positions taken in our market-making activities. Income earned on these market-making activities are reflected in the fair value changes of these positions recorded in net gains from trading activities.

AFS and HTM Debt Securities

AFS and HTM Debt Securities	3 Months Ended
	Mar. 31, 2018
AFS and HTM Debt Securities [Abstract]
AFS and HTM Debt Securities	Note 5: Available-for-Sale and Held-to-Maturity Debt Securities Table 5.1 provides the amortized cost and fair value by major categories of available-for-sale debt securities, which are carried at fair value, and held-to-maturity debt securities, which are carried at amortized cost. The net unrealized gains (losses) for available-for-sale debt securities are reported on an after-tax basis as a component of cumulative OCI. Information on debt securities held for trading is included in Note 4 (Trading Activities) to Financial Statements in this Report. Table 5.1: Amortized Cost and Fair Value (in millions) Amortized Cost Gross unrealized gains Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ 6,426 1 (148 ) 6,279 Securities of U.S. states and political subdivisions 49,117 939 (413 ) 49,643 Mortgage-backed securities: Federal agencies 160,216 431 (3,833 ) 156,814 Residential 4,233 243 (2 ) 4,474 Commercial 4,722 78 (10 ) 4,790 Total mortgage-backed securities 169,171 752 (3,845 ) 166,078 Corporate debt securities 6,918 299 (34 ) 7,183 Collateralized loan and other debt obligations (1) 36,360 394 (2 ) 36,752 Other (2) 5,596 131 (6 ) 5,721 Total available-for-sale debt securities 273,588 2,516 (4,448 ) 271,656 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies 44,727 — (548 ) 44,179 Securities of U.S. states and political subdivisions 6,307 26 (102 ) 6,231 Federal agency and other mortgage-backed securities (3) 89,748 35 (2,537 ) 87,246 Collateralized loan obligations 567 3 — 570 Other (2) 97 — — 97 Total held-to-maturity debt securities 141,446 64 (3,187 ) 138,323 Total $ 415,034 2,580 (7,635 ) 409,979 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ 6,425 2 (108 ) 6,319 Securities of U.S. states and political subdivisions 50,733 1,032 (439 ) 51,326 Mortgage-backed securities: Federal agencies 160,561 930 (1,272 ) 160,219 Residential 4,356 254 (2 ) 4,608 Commercial 4,487 80 (2 ) 4,565 Total mortgage-backed securities 169,404 1,264 (1,276 ) 169,392 Corporate debt securities 7,343 363 (40 ) 7,666 Collateralized loan and other debt obligations (1) 35,675 384 (3 ) 36,056 Other (2) 5,516 137 (5 ) 5,648 Total available-for-sale debt securities 275,096 3,182 (1,871 ) 276,407 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies 44,720 189 (103 ) 44,806 Securities of U.S. states and political subdivisions 6,313 84 (43 ) 6,354 Federal agency and other mortgage-backed securities (3) 87,527 201 (682 ) 87,046 Collateralized loan obligations 661 4 — 665 Other (2) 114 — — 114 Total held-to-maturity debt securities 139,335 478 (828 ) 138,985 Total $ 414,431 3,660 (2,699 ) 415,392 (1) Available-for-sale debt securities include collateralized debt obligations (CDOs) with a cost basis and fair value of $869 million and $1.0 billion , respectively, at March 31, 2018 , and $887 million and $1.0 billion , respectively, at December 31, 2017 . (2) The “Other” category of available-for-sale debt securities largely includes asset-backed securities collateralized by student loans. Included in the “Other” category of held-to-maturity debt securities are asset-backed securities collateralized by automobile leases or loans and cash with a cost basis and fair value of $97 million each at March 31, 2018 , and $114 million each at December 31, 2017 . (3) Predominantly consists of federal agency mortgage-backed securities at both March 31, 2018 and December 31, 2017 . Gross Unrealized Losses and Fair Value Table 5.2 shows the gross unrealized losses and fair value of available-for-sale and held-to-maturity debt securities by length of time those individual securities in each category have been in a continuous loss position. Debt securities on which we have taken credit-related OTTI write-downs are categorized as being “less than 12 months” or “12 months or more” in a continuous loss position based on the point in time that the fair value declined to below the cost basis and not the period of time since the credit-related OTTI write-down. Table 5.2: Gross Unrealized Losses and Fair Value Less than 12 months 12 months or more Total (in millions) Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (56 ) 4,037 (92 ) 2,203 (148 ) 6,240 Securities of U.S. states and political subdivisions (26 ) 5,292 (387 ) 10,526 (413 ) 15,818 Mortgage-backed securities: Federal agencies (2,211 ) 103,361 (1,622 ) 38,197 (3,833 ) 141,558 Residential (1 ) 161 (1 ) 53 (2 ) 214 Commercial (9 ) 430 (1 ) 109 (10 ) 539 Total mortgage-backed securities (2,221 ) 103,952 (1,624 ) 38,359 (3,845 ) 142,311 Corporate debt securities (10 ) 664 (24 ) 395 (34 ) 1,059 Collateralized loan and other debt obligations (1 ) 1,476 (1 ) 162 (2 ) 1,638 Other (1 ) 169 (5 ) 323 (6 ) 492 Total available-for-sale debt securities (2,315 ) 115,590 (2,133 ) 51,968 (4,448 ) 167,558 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (494 ) 42,710 (54 ) 1,469 (548 ) 44,179 Securities of U.S. states and political subdivisions (36 ) 2,967 (66 ) 1,653 (102 ) 4,620 Federal agency and other mortgage-backed securities (1,411 ) 58,073 (1,126 ) 26,991 (2,537 ) 85,064 Collateralized loan obligations — — — — — — Other — — — — — — Total held-to-maturity debt securities (1,941 ) 103,750 (1,246 ) 30,113 (3,187 ) 133,863 Total $ (4,256 ) 219,340 (3,379 ) 82,081 (7,635 ) 301,421 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (27 ) 4,065 (81 ) 2,209 (108 ) 6,274 Securities of U.S. states and political subdivisions (17 ) 6,179 (422 ) 11,766 (439 ) 17,945 Mortgage-backed securities: Federal agencies (243 ) 52,559 (1,029 ) 44,691 (1,272 ) 97,250 Residential (1 ) 47 (1 ) 58 (2 ) 105 Commercial (1 ) 101 (1 ) 133 (2 ) 234 Total mortgage-backed securities (245 ) 52,707 (1,031 ) 44,882 (1,276 ) 97,589 Corporate debt securities (4 ) 239 (36 ) 503 (40 ) 742 Collateralized loan and other debt obligations (1 ) 373 (2 ) 146 (3 ) 519 Other (1 ) 37 (4 ) 483 (5 ) 520 Total available-for-sale debt securities (295 ) 63,600 (1,576 ) 59,989 (1,871 ) 123,589 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (69 ) 11,255 (34 ) 1,490 (103 ) 12,745 Securities of U.S. states and political subdivisions (5 ) 500 (38 ) 1,683 (43 ) 2,183 Federal agency and other mortgage-backed securities (198 ) 29,713 (484 ) 28,244 (682 ) 57,957 Collateralized loan obligations — — — — — — Other — — — — — — Total held-to-maturity debt securities (272 ) 41,468 (556 ) 31,417 (828 ) 72,885 Total $ (567 ) 105,068 (2,132 ) 91,406 (2,699 ) 196,474 We have assessed each debt security with gross unrealized losses included in the previous table for credit impairment. As part of that assessment we evaluated and concluded that we do not intend to sell any of the debt securities and that it is more likely than not that we will not be required to sell prior to recovery of the amortized cost basis. We evaluate, where necessary, whether credit impairment exists by comparing the present value of the expected cash flows to the debt securities’ amortized cost basis. For descriptions of the factors we consider when analyzing debt securities for impairment, see Note 1 (Summary of Significant Accounting Policies) and Note 5 (Investment Securities) to Financial Statements in our 2017 Form 10-K. There were no material changes to our methodologies for assessing impairment in the first quarter 2018 . Table 5.3 shows the gross unrealized losses and fair value of the available-for-sale and held-to-maturity debt securities by those rated investment grade and those rated less than investment grade, according to their lowest credit rating by Standard & Poor’s Rating Services (S&P) or Moody’s Investors Service (Moody’s). Credit ratings express opinions about the credit quality of a debt security. Debt securities rated investment grade, that is those rated BBB- or higher by S&P or Baa3 or higher by Moody’s, are generally considered by the rating agencies and market participants to be low credit risk. Conversely, debt securities rated below investment grade, labeled as “speculative grade” by the rating agencies, are considered to be distinctively higher credit risk than investment grade debt securities. We have also included debt securities not rated by S&P or Moody’s in the table below based on our internal credit grade of the debt securities (used for credit risk management purposes) equivalent to the credit rating assigned by major credit agencies. The unrealized losses and fair value of unrated debt securities categorized as investment grade based on internal credit grades were $25 million and $5.0 billion , respectively, at March 31, 2018 , and $32 million and $6.9 billion , respectively, at December 31, 2017 . If an internal credit grade was not assigned, we categorized the debt security as non-investment grade. Table 5.3: Gross Unrealized Losses and Fair Value by Investment Grade Investment grade Non-investment grade (in millions) Gross unrealized losses Fair value Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (148 ) 6,240 — — Securities of U.S. states and political subdivisions (392 ) 15,551 (21 ) 267 Mortgage-backed securities: Federal agencies (3,833 ) 141,558 — — Residential (1 ) 146 (1 ) 68 Commercial (2 ) 379 (8 ) 160 Total mortgage-backed securities (3,836 ) 142,083 (9 ) 228 Corporate debt securities (10 ) 370 (24 ) 689 Collateralized loan and other debt obligations (2 ) 1,638 — — Other (4 ) 443 (2 ) 49 Total available-for-sale debt securities (4,392 ) 166,325 (56 ) 1,233 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (548 ) 44,179 — — Securities of U.S. states and political subdivisions (102 ) 4,620 — — Federal agency and other mortgage-backed securities (2,529 ) 84,695 (8 ) 369 Collateralized loan obligations — — — — Other — — — — Total held-to-maturity debt securities (3,179 ) 133,494 (8 ) 369 Total $ (7,571 ) 299,819 (64 ) 1,602 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (108 ) 6,274 — — Securities of U.S. states and political subdivisions (412 ) 17,763 (27 ) 182 Mortgage-backed securities: Federal agencies (1,272 ) 97,250 — — Residential (1 ) 42 (1 ) 63 Commercial (1 ) 183 (1 ) 51 Total mortgage-backed securities (1,274 ) 97,475 (2 ) 114 Corporate debt securities (13 ) 304 (27 ) 438 Collateralized loan and other debt obligations (3 ) 519 — — Other (2 ) 469 (3 ) 51 Total available-for-sale debt securities (1,812 ) 122,804 (59 ) 785 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (103 ) 12,745 — — Securities of U.S. states and political subdivisions (43 ) 2,183 — — Federal agency and other mortgage-backed securities (680 ) 57,789 (2 ) 168 Collateralized loan obligations — — — — Other — — — — Total held-to-maturity debt securities (826 ) 72,717 (2 ) 168 Total $ (2,638 ) 195,521 (61 ) 953 Contractual Maturities Table 5.4 shows the remaining contractual maturities and contractual weighted-average yields (taxable-equivalent basis) of available-for-sale debt securities. The remaining contractual principal maturities for MBS do not consider prepayments. Remaining expected maturities will differ from contractual maturities because borrowers may have the right to prepay obligations before the underlying mortgages mature. Table 5.4: Contractual Maturities Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Yield Amount Yield Amount Yield Amount Yield Amount Yield March 31, 2018 Available-for-sale debt securities (1): Fair value: Securities of U.S. Treasury and federal agencies $ 6,279 1.59 % $ 117 1.60 % $ 6,114 1.59 % $ 48 1.90 % $ — — % Securities of U.S. states and political subdivisions 49,643 4.75 2,089 2.70 8,343 3.05 4,293 3.16 34,918 5.48 Mortgage-backed securities: Federal agencies 156,814 3.29 7 2.06 194 3.29 5,139 2.81 151,474 3.30 Residential 4,474 3.61 — — 23 5.70 8 2.36 4,443 3.60 Commercial 4,790 3.45 — — — — 219 3.10 4,571 3.46 Total mortgage-backed securities 166,078 3.30 7 2.06 217 3.54 5,366 2.83 160,488 3.32 Corporate debt securities 7,183 5.11 335 5.08 2,658 5.48 3,280 4.73 910 5.38 Collateralized loan and other debt obligations 36,752 3.29 — — 37 2.09 14,788 3.27 21,927 3.31 Other 5,721 2.85 66 4.26 582 3.06 1,480 2.34 3,593 3.00 Total available-for-sale debt securities at fair value $ 271,656 3.56 % $ 2,614 2.98 % $ 17,951 2.92 % $ 29,255 3.28 % $ 221,836 3.66 % December 31, 2017 Available-for-sale debt securities (1): ` Fair value: Securities of U.S. Treasury and federal agencies $ 6,319 1.59 % $ 81 1.37 % $ 6,189 1.59 % $ 49 1.89 % $ — — % Securities of U.S. states and political subdivisions 51,326 5.88 2,380 3.47 9,484 3.42 2,276 4.63 37,186 6.75 Mortgage-backed securities: Federal agencies 160,219 3.27 15 2.03 210 3.08 5,534 2.82 154,460 3.28 Residential 4,608 3.52 — — 24 5.67 11 2.46 4,573 3.51 Commercial 4,565 3.45 — — — — 166 2.69 4,399 3.48 Total mortgage-backed securities 169,392 3.28 15 2.03 234 3.35 5,711 2.82 163,432 3.30 Corporate debt securities 7,666 5.12 443 5.54 2,738 5.56 3,549 4.70 936 5.26 Collateralized loan and other debt obligations 36,056 2.98 — — 50 1.68 15,008 2.96 20,998 3.00 Other 5,648 2.46 71 3.56 463 2.72 1,466 2.13 3,648 2.53 Total available-for-sale debt securities at fair value $ 276,407 3.72 % $ 2,990 3.70 % $ 19,158 3.11 % $ 28,059 3.24 % $ 226,200 3.83 % (1) Weighted-average yields displayed by maturity bucket are weighted based on fair value and predominantly represent contractual coupon rates without effect for any related hedging derivatives. Table 5.5 shows the amortized cost and weighted-average yields of held-to-maturity debt securities by contractual maturity. Table 5.5: Amortized Cost by Contractual Maturity Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Yield Amount Yield Amount Yield Amount Yield Amount Yield March 31, 2018 Held-to-maturity debt securities (1): Amortized cost: Securities of U.S. Treasury and federal agencies $ 44,727 2.12 % $ — — % $ 32,336 2.04 % $ 12,391 2.32 % $ — — % Securities of U.S. states and political subdivisions 6,307 4.93 — — 50 5.88 793 5.16 5,464 4.89 Federal agency and other mortgage-backed securities 89,748 3.10 — — 15 2.70 11 2.62 89,722 3.10 Collateralized loan obligations 567 3.22 — — — — 567 3.22 — — Other 97 1.83 — — 97 1.83 — — — — Total held-to-maturity debt securities at amortized cost $ 141,446 2.87 % $ — — % $ 32,498 2.05 % $ 13,762 2.52 % $ 95,186 3.20 % December 31, 2017 Held-to-maturity debt securities (1): Amortized cost: Securities of U.S. Treasury and federal agencies $ 44,720 2.12 % $ — — % $ 32,330 2.04 % $ 12,390 2.32 % $ — — % Securities of U.S. states and political subdivisions 6,313 6.02 — — 50 7.18 695 6.31 5,568 5.98 Federal agency and other mortgage-backed securities 87,527 3.11 — — 15 2.81 11 2.49 87,501 3.11 Collateralized loan obligations 661 2.86 — — — — 661 2.86 — — Other 114 1.83 — — 114 1.83 — — — — Total held-to-maturity debt securities at amortized cost $ 139,335 2.92 % $ — — % $ 32,509 2.05 % $ 13,757 2.55 % $ 93,069 3.28 % (1) Weighted-average yields displayed by maturity bucket are weighted based on amortized cost and predominantly represent contractual coupon rates. Table 5.6 shows the fair value of held-to-maturity debt securities by contractual maturity. Table 5.6: Fair Value by Contractual Maturity Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Amount Amount Amount Amount March 31, 2018 Held-to-maturity debt securities: Fair value: Securities of U.S. Treasury and federal agencies $ 44,179 — 32,014 12,165 — Securities of U.S. states and political subdivisions 6,231 — 49 788 5,394 Federal agency and other mortgage-backed securities 87,246 — 15 11 87,220 Collateralized loan obligations 570 — — 570 — Other 97 — 97 — — Total held-to-maturity debt securities at fair value $ 138,323 — 32,175 13,534 92,614 December 31, 2017 Held-to-maturity debt securities: Fair value: Securities of U.S. Treasury and federal agencies $ 44,806 — 32,388 12,418 — Securities of U.S. states and political subdivisions 6,354 — 49 701 5,604 Federal agency and other mortgage-backed securities 87,046 — 15 11 87,020 Collateralized loan obligations 665 — — 665 — Other 114 — 114 — — Total held-to-maturity debt securities at fair value $ 138,985 — 32,566 13,795 92,624 Realized Gains and Losses Table 5.7 shows the gross realized gains and losses on sales and OTTI write-downs related to available-for-sale debt securities. Table 5.7: Realized Gains and Losses Quarter ended March 31, (in millions) 2018 2017 Gross realized gains $ 21 124 Gross realized losses (10 ) (36 ) OTTI write-downs (10 ) (52 ) Net realized gains from available-for-sale debt securities $ 1 36 Other-Than-Temporarily Impaired Debt Securities Table 5.8 shows the detail of total OTTI write-downs included in earnings for available-for-sale debt securities. There were no OTTI write-downs on held-to-maturity debt securities during first quarter 2018 and 2017 . Table 5.8: Detail of OTTI Write-downs Quarter ended March 31, (in millions) 2018 2017 Debt securities OTTI write-downs included in earnings: Securities of U.S. states and political subdivisions $ 2 8 Mortgage-backed securities: Residential 1 3 Commercial 7 25 Corporate debt securities — 16 Total debt securities OTTI write-downs included in earnings $ 10 52 Table 5.9 shows the detail of OTTI write-downs on available-for-sale debt securities included in earnings and the related changes in OCI for the same securities. Table 5.9: OTTI Write-downs Included in Earnings and the Related Changes in OCI Quarter ended March 31, (in millions) 2018 2017 OTTI on debt securities Recorded as part of gross realized losses: Credit-related OTTI $ 9 52 Intent-to-sell OTTI 1 — Total recorded as part of gross realized losses 10 52 Changes to OCI for losses (reversal of losses) in non-credit-related OTTI (1): Securities of U.S. states and political subdivisions (2 ) (5 ) Residential mortgage-backed securities (1 ) 3 Commercial mortgage-backed securities 10 (7 ) Total changes to OCI for non-credit-related OTTI 7 (9 ) Total OTTI losses recorded on debt securities $ 17 43 (1) Represents amounts recorded to OCI for impairment of debt securities, due to factors other than credit, that have also had credit-related OTTI write-downs during the period. Increases represent initial or subsequent non-credit-related OTTI on debt securities. Decreases represent partial to full reversal of impairment due to recoveries in the fair value of debt securities due to non-credit factors. Table 5.10 presents a rollforward of the OTTI credit loss that has been recognized in earnings as a write-down of available-for-sale debt securities we still own (referred to as “credit-impaired” debt securities) and do not intend to sell. Recognized credit loss represents the difference between the present value of expected future cash flows discounted using the security’s current effective interest rate and the amortized cost basis of the security prior to considering credit loss. Table 5.10: Rollforward of OTTI Credit Loss Quarter ended March 31, (in millions) 2018 2017 Credit loss recognized, beginning of period $ 742 1,043 Additions: For securities with initial credit impairments — 6 For securities with previous credit impairments 9 46 Total additions 9 52 Reductions: For securities sold, matured, or intended/required to be sold (101 ) (7 ) For recoveries of previous credit impairments (1) (1 ) (2 ) Total reductions (102 ) (9 ) Credit loss recognized, end of period $ 649 1,086 (1) Recoveries of previous credit impairments result from increases in expected cash flows subsequent to credit loss recognition. Such recoveries are reflected prospectively as interest yield adjustments using the effective interest method.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans and Allowance for Credit Losses	Note 6: Loans and Allowance for Credit Losses Table 6.1 presents total loans outstanding by portfolio segment and class of financing receivable. Outstanding balances include a total net reduction of $3.2 billion and $3.9 billion at March 31, 2018 , and December 31, 2017 , respectively, for unearned income, net deferred loan fees, and unamortized discounts and premiums. Table 6.1: Loans Outstanding (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 334,678 333,125 Real estate mortgage 125,543 126,599 Real estate construction 23,882 24,279 Lease financing 19,293 19,385 Total commercial 503,396 503,388 Consumer: Real estate 1-4 family first mortgage 282,658 284,054 Real estate 1-4 family junior lien mortgage 37,920 39,713 Credit card 36,103 37,976 Automobile 49,554 53,371 Other revolving credit and installment 37,677 38,268 Total consumer 443,912 453,382 Total loans $ 947,308 956,770 Our foreign loans are reported by respective class of financing receivable in the table above. Substantially all of our foreign loan portfolio is commercial loans. Loans are classified as foreign primarily based on whether the borrower’s primary address is outside of the United States. Table 6.2 presents total commercial foreign loans outstanding by class of financing receivable. Table 6.2: Commercial Foreign Loans Outstanding (in millions) Mar 31, Dec 31, Commercial foreign loans: Commercial and industrial $ 59,696 60,106 Real estate mortgage 8,082 8,033 Real estate construction 668 655 Lease financing 1,077 1,126 Total commercial foreign loans $ 69,523 69,920 Loan Purchases, Sales, and Transfers Table 6.3 summarizes the proceeds paid or received for purchases and sales of loans and transfers from loans held for investment to mortgages/loans held for sale at lower of cost or fair value. This loan activity also includes participating interests, whereby we receive or transfer a portion of a loan. The table excludes PCI loans and loans for which we have elected the fair value option, including loans originated for sale because their loan activity normally does not impact the allowance for credit losses. Table 6.3: Loan Purchases, Sales, and Transfers 2018 2017 (in millions) Commercial Consumer (1) Total Commercial Consumer (1) Total Quarter ended March 31, Purchases $ 256 — 256 1,159 2 1,161 Sales (460 ) — (460 ) (287 ) (62 ) (349 ) Transfers to MHFS/LHFS (420 ) (1,553 ) (1,973 ) (479 ) — (479 ) (1) Excludes activity in government insured/guaranteed real estate 1-4 family first mortgage loans. As servicer, we are able to buy delinquent insured/guaranteed loans out of the Government National Mortgage Association (GNMA) pools, and manage and/or resell them in accordance with applicable requirements. These loans are predominantly insured by the Federal Housing Administration (FHA) or guaranteed by the Department of Veterans Affairs (VA). Accordingly, these loans have limited impact on the allowance for loan losses. Commitments to Lend A commitment to lend is a legally binding agreement to lend funds to a customer, usually at a stated interest rate, if funded, and for specific purposes and time periods. We generally require a fee to extend such commitments. Certain commitments are subject to loan agreements with covenants regarding the financial performance of the customer or borrowing base formulas on an ongoing basis that must be met before we are required to fund the commitment. We may reduce or cancel consumer commitments, including home equity lines and credit card lines, in accordance with the contracts and applicable law. We may, as a representative for other lenders, advance funds or provide for the issuance of letters of credit under syndicated loan or letter of credit agreements. Any advances are generally repaid in less than a week and would normally require default of both the customer and another lender to expose us to loss. These temporary advance arrangements totaled approximately $89 billion and $85 billion at March 31, 2018 and December 31, 2017 , respectively. We issue commercial letters of credit to assist customers in purchasing goods or services, typically for international trade. At March 31, 2018 , and December 31, 2017 , we had $1.1 billion and $982 million , respectively, of outstanding issued commercial letters of credit. We also originate multipurpose lending commitments under which borrowers have the option to draw on the facility for different purposes in one of several forms, including a standby letter of credit. See Note 12 (Guarantees, Pledged Assets and Collateral, and Other Commitments) for additional information on standby letters of credit. When we make commitments, we are exposed to credit risk. The maximum credit risk for these commitments will generally be lower than the contractual amount because a significant portion of these commitments is expected to expire without being used by the customer. In addition, we manage the potential risk in commitments to lend by limiting the total amount of commitments, both by individual customer and in total, by monitoring the size and maturity structure of these commitments and by applying the same credit standards for these commitments as for all of our credit activities. For loans and commitments to lend, we generally require collateral or a guarantee. We may require various types of collateral, including commercial and consumer real estate, automobiles, other short-term liquid assets such as accounts receivable or inventory and long-lived assets, such as equipment and other business assets. Collateral requirements for each loan or commitment may vary based on the loan product and our assessment of a customer’s credit risk according to the specific credit underwriting, including credit terms and structure. The contractual amount of our unfunded credit commitments, including unissued standby and commercial letters of credit, is summarized by portfolio segment and class of financing receivable in Table 6.4 . The table excludes the issued standby and commercial letters of credit and temporary advance arrangements described above. Table 6.4: Unfunded Credit Commitments (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 325,091 326,626 Real estate mortgage 7,233 7,485 Real estate construction 15,612 16,621 Lease financing — — Total commercial 347,936 350,732 Consumer: Real estate 1-4 family first mortgage 32,220 29,876 Real estate 1-4 family junior lien mortgage 38,817 38,897 Credit card 111,427 108,465 Other revolving credit and installment 27,635 27,541 Total consumer 210,099 204,779 Total unfunded credit commitments $ 558,035 555,511 Allowance for Credit Losses Table 6.5 presents the allowance for credit losses, which consists of the allowance for loan losses and the allowance for unfunded credit commitments. Table 6.5: Allowance for Credit Losses Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 11,960 12,540 Provision for credit losses 191 605 Interest income on certain impaired loans (1) (43 ) (48 ) Loan charge-offs: Commercial: Commercial and industrial (164 ) (253 ) Real estate mortgage (2 ) (5 ) Real estate construction — — Lease financing (17 ) (7 ) Total commercial (183 ) (265 ) Consumer: Real estate 1-4 family first mortgage (41 ) (69 ) Real estate 1-4 family junior lien mortgage (47 ) (93 ) Credit card (405 ) (367 ) Automobile (300 ) (255 ) Other revolving credit and installment (180 ) (189 ) Total consumer (973 ) (973 ) Total loan charge-offs (1,156 ) (1,238 ) Loan recoveries: Commercial: Commercial and industrial 79 82 Real estate mortgage 17 30 Real estate construction 4 8 Lease financing 5 2 Total commercial 105 122 Consumer: Real estate 1-4 family first mortgage 59 62 Real estate 1-4 family junior lien mortgage 55 70 Credit card 73 58 Automobile 92 88 Other revolving credit and installment 31 33 Total consumer 310 311 Total loan recoveries 415 433 Net loan charge-offs (741 ) (805 ) Other (54 ) (5 ) Balance, end of period $ 11,313 12,287 Components: Allowance for loan losses $ 10,373 11,168 Allowance for unfunded credit commitments 940 1,119 Allowance for credit losses $ 11,313 12,287 Net loan charge-offs (annualized) as a percentage of average total loans 0.32 % 0.34 Allowance for loan losses as a percentage of total loans 1.10 1.17 Allowance for credit losses as a percentage of total loans 1.19 1.28 (1) Certain impaired loans with an allowance calculated by discounting expected cash flows using the loan’s effective interest rate over the remaining life of the loan recognize changes in allowance attributable to the passage of time as interest income. Table 6.6 summarizes the activity in the allowance for credit losses by our commercial and consumer portfolio segments. Table 6.6: Allowance Activity by Portfolio Segment 2018 2017 (in millions) Commercial Consumer Total Commercial Consumer Total Quarter ended March 31, Balance, beginning of period $ 6,632 5,328 11,960 7,394 5,146 12,540 Provision (reversal of provision) for credit losses 169 22 191 (89 ) 694 605 Interest income on certain impaired loans (11 ) (32 ) (43 ) (15 ) (33 ) (48 ) Loan charge-offs (183 ) (973 ) (1,156 ) (265 ) (973 ) (1,238 ) Loan recoveries 105 310 415 122 311 433 Net loan charge-offs (78 ) (663 ) (741 ) (143 ) (662 ) (805 ) Other (4 ) (50 ) (54 ) (5 ) — (5 ) Balance, end of period $ 6,708 4,605 11,313 7,142 5,145 12,287 Table 6.7 disaggregates our allowance for credit losses and recorded investment in loans by impairment methodology. Table 6.7: Allowance by Impairment Methodology Allowance for credit losses Recorded investment in loans (in millions) Commercial Consumer Total Commercial Consumer Total March 31, 2018 Collectively evaluated (1) $ 6,029 3,580 9,609 499,578 418,877 918,455 Individually evaluated (2) 669 1,025 1,694 3,743 14,401 18,144 PCI (3) 10 — 10 75 10,634 10,709 Total $ 6,708 4,605 11,313 503,396 443,912 947,308 December 31, 2017 Collectively evaluated (1) $ 5,927 4,143 10,070 499,342 425,919 925,261 Individually evaluated (2) 705 1,185 1,890 3,960 14,714 18,674 PCI (3) — — — 86 12,749 12,835 Total $ 6,632 5,328 11,960 503,388 453,382 956,770 (1) Represents loans collectively evaluated for impairment in accordance with Accounting Standards Codification (ASC) 450-20, Loss Contingencies (formerly FAS 5), and pursuant to amendments by ASU 2010-20 regarding allowance for non-impaired loans. (2) Represents loans individually evaluated for impairment in accordance with ASC 310-10, Receivables (formerly FAS 114), and pursuant to amendments by ASU 2010-20 regarding allowance for impaired loans. (3) Represents the allowance and related loan carrying value determined in accordance with ASC 310-30 , Receivables – Loans and Debt Securities Acquired with Deteriorated Credit Quality (formerly SOP 03-3) and pursuant to amendments by ASU 2010-20 regarding allowance for PCI loans. Credit Quality We monitor credit quality by evaluating various attributes and utilize such information in our evaluation of the appropriateness of the allowance for credit losses. The following sections provide the credit quality indicators we most closely monitor. The credit quality indicators are generally based on information as of our financial statement date, with the exception of updated Fair Isaac Corporation (FICO) scores and updated loan-to-value (LTV)/combined LTV (CLTV). We obtain FICO scores at loan origination and the scores are generally updated at least quarterly, except in limited circumstances, including compliance with the Fair Credit Reporting Act (FCRA). Generally, the LTV and CLTV indicators are updated in the second month of each quarter, with updates no older than December 31, 2017 . See the “Purchased Credit-Impaired Loans” section in this Note for credit quality information on our PCI portfolio. COMMERCIAL CREDIT QUALITY INDICATORS In addition to monitoring commercial loan concentration risk, we manage a consistent process for assessing commercial loan credit quality. Generally, commercial loans are subject to individual risk assessment using our internal borrower and collateral quality ratings. Our ratings are aligned to Pass and Criticized categories. The Criticized category includes Special Mention, Substandard, and Doubtful categories which are defined by bank regulatory agencies. Table 6.8 provides a breakdown of outstanding commercial loans by risk category. Of the $16.3 billion in criticized commercial and industrial loans and $4.6 billion in criticized commercial real estate (CRE) loans at March 31, 2018 , $1.5 billion and $800 million , respectively, have been placed on nonaccrual status and written down to net realizable collateral value. Table 6.8: Commercial Loans by Risk Category (in millions) Commercial and industrial Real estate mortgage Real estate construction Lease financing Total March 31, 2018 By risk category: Pass $ 318,334 121,151 23,647 18,120 481,252 Criticized 16,269 4,392 235 1,173 22,069 Total commercial loans (excluding PCI) 334,603 125,543 23,882 19,293 503,321 Total commercial PCI loans (carrying value) 75 — — — 75 Total commercial loans $ 334,678 125,543 23,882 19,293 503,396 December 31, 2017 By risk category: Pass $ 316,431 122,312 23,981 18,162 480,886 Criticized 16,608 4,287 298 1,223 22,416 Total commercial loans (excluding PCI) 333,039 126,599 24,279 19,385 503,302 Total commercial PCI loans (carrying value) 86 — — — 86 Total commercial loans $ 333,125 126,599 24,279 19,385 503,388 Table 6.9 provides past due information for commercial loans, which we monitor as part of our credit risk management practices. Table 6.9: Commercial Loans by Delinquency Status (in millions) Commercial and industrial Real estate mortgage Real estate construction Lease financing Total March 31, 2018 By delinquency status: Current-29 days past due (DPD) and still accruing $ 332,432 124,148 23,706 19,077 499,363 30-89 DPD and still accruing 615 617 130 123 1,485 90+ DPD and still accruing 40 23 1 — 64 Nonaccrual loans 1,516 755 45 93 2,409 Total commercial loans (excluding PCI) 334,603 125,543 23,882 19,293 503,321 Total commercial PCI loans (carrying value) 75 — — — 75 Total commercial loans $ 334,678 125,543 23,882 19,293 503,396 December 31, 2017 By delinquency status: Current-29 DPD and still accruing $ 330,319 125,642 24,107 19,148 499,216 30-89 DPD and still accruing 795 306 135 161 1,397 90+ DPD and still accruing 26 23 — — 49 Nonaccrual loans 1,899 628 37 76 2,640 Total commercial loans (excluding PCI) 333,039 126,599 24,279 19,385 503,302 Total commercial PCI loans (carrying value) 86 — — — 86 Total commercial loans $ 333,125 126,599 24,279 19,385 503,388 CONSUMER CREDIT QUALITY INDICATORS We have various classes of consumer loans that present unique risks. Loan delinquency, FICO credit scores and LTV for loan types are common credit quality indicators that we monitor and utilize in our evaluation of the appropriateness of the allowance for credit losses for the consumer portfolio segment. Many of our loss estimation techniques used for the allowance for credit losses rely on delinquency-based models; therefore, delinquency is an important indicator of credit quality and the establishment of our allowance for credit losses. Table 6.10 provides the outstanding balances of our consumer portfolio by delinquency status. Table 6.10: Consumer Loans by Delinquency Status (in millions) Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Credit card Automobile Other revolving credit and installment Total March 31, 2018 By delinquency status: Current-29 DPD $ 253,542 37,046 35,198 48,136 37,320 411,242 30-59 DPD 1,449 273 244 991 135 3,092 60-89 DPD 589 141 188 306 84 1,308 90-119 DPD 290 93 167 116 78 744 120-179 DPD 279 104 304 4 27 718 180+ DPD 1,105 238 2 1 33 1,379 Government insured/guaranteed loans (1) 14,795 — — — — 14,795 Total consumer loans (excluding PCI) 272,049 37,895 36,103 49,554 37,677 433,278 Total consumer PCI loans (carrying value) 10,609 25 — — — 10,634 Total consumer loans $ 282,658 37,920 36,103 49,554 37,677 443,912 December 31, 2017 By delinquency status: Current-29 DPD $ 251,786 38,746 36,996 51,445 37,885 416,858 30-59 DPD 1,893 336 287 1,385 155 4,056 60-89 DPD 742 163 201 392 93 1,591 90-119 DPD 369 103 192 146 80 890 120-179 DPD 308 95 298 3 30 734 180+ DPD 1,091 243 2 — 25 1,361 Government insured/guaranteed loans (1) 15,143 — — — — 15,143 Total consumer loans (excluding PCI) 271,332 39,686 37,976 53,371 38,268 440,633 Total consumer PCI loans (carrying value) 12,722 27 — — — 12,749 Total consumer loans $ 284,054 39,713 37,976 53,371 38,268 453,382 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. Loans insured/guaranteed by the FHA/VA and 90+ DPD totaled $9.4 billion at March 31, 2018 , compared with $10.5 billion at December 31, 2017 . Of the $2.8 billion of consumer loans not government insured/guaranteed that are 90 days or more past due at March 31, 2018 , $903 million was accruing, compared with $3.0 billion past due and $1.0 billion accruing at December 31, 2017 . Real estate 1-4 family first mortgage loans 180 days or more past due totaled $1.1 billion , or 0.4% of total first mortgages (excluding PCI), at both March 31, 2018 and December 31, 2017 . Table 6.11 provides a breakdown of our consumer portfolio by FICO. Most of the scored consumer portfolio has an updated FICO of 680 and above, reflecting a strong current borrower credit profile. FICO is not available for certain loan types, or may not be required if we deem it unnecessary due to strong collateral and other borrower attributes. Substantially all loans not requiring a FICO score are securities-based loans originated through retail brokerage, and totaled $8.7 billion at March 31, 2018 , and $8.5 billion at December 31, 2017 . Table 6.11: Consumer Loans by FICO (in millions) Real estate 1-4 family first mortgage (1) Real estate 1-4 family junior lien mortgage (1) Credit card Automobile Other revolving credit and installment Total March 31, 2018 By FICO: < 600 $ 4,674 1,601 3,407 8,546 828 19,056 600-639 3,405 1,223 2,915 5,161 862 13,566 640-679 6,717 2,274 5,352 6,936 1,906 23,185 680-719 14,313 4,604 7,304 8,049 3,397 37,667 720-759 27,119 6,007 7,808 7,215 4,947 53,096 760-799 54,227 6,918 6,065 6,036 6,223 79,469 800+ 141,351 14,506 2,922 7,399 8,252 174,430 No FICO available 5,448 762 330 212 2,525 9,277 FICO not required — — — — 8,737 8,737 Government insured/guaranteed loans (1) 14,795 — — — — 14,795 Total consumer loans (excluding PCI) 272,049 37,895 36,103 49,554 37,677 433,278 Total consumer PCI loans (carrying value) 10,609 25 — — — 10,634 Total consumer loans $ 282,658 37,920 36,103 49,554 37,677 443,912 December 31, 2017 By FICO: < 600 $ 5,145 1,768 3,525 8,858 863 20,159 600-639 3,487 1,253 3,101 5,615 904 14,360 640-679 6,789 2,387 5,690 7,696 1,959 24,521 680-719 14,977 4,797 7,628 8,825 3,582 39,809 720-759 27,926 6,246 8,097 7,806 5,089 55,164 760-799 55,590 7,323 6,372 6,468 6,257 82,010 800+ 136,729 15,144 2,994 7,845 8,455 171,167 No FICO available 5,546 768 569 258 2,648 9,789 FICO not required — — — — 8,511 8,511 Government insured/guaranteed loans (1) 15,143 — — — — 15,143 Total consumer loans (excluding PCI) 271,332 39,686 37,976 53,371 38,268 440,633 Total consumer PCI loans (carrying value) 12,722 27 — — — 12,749 Total consumer loans $ 284,054 39,713 37,976 53,371 38,268 453,382 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. LTV refers to the ratio comparing the loan’s unpaid principal balance to the property’s collateral value. CLTV refers to the combination of first mortgage and junior lien mortgage (including unused line amounts for credit line products) ratios. LTVs and CLTVs are updated quarterly using a cascade approach which first uses values provided by automated valuation models (AVMs) for the property. If an AVM is not available, then the value is estimated using the original appraised value adjusted by the change in Home Price Index (HPI) for the property location. If an HPI is not available, the original appraised value is used. The HPI value is normally the only method considered for high value properties, generally with an original value of $1 million or more, as the AVM values have proven less accurate for these properties. Table 6.12 shows the most updated LTV and CLTV distribution of the real estate 1-4 family first and junior lien mortgage loan portfolios. We consider the trends in residential real estate markets as we monitor credit risk and establish our allowance for credit losses. In the event of a default, any loss should be limited to the portion of the loan amount in excess of the net realizable value of the underlying real estate collateral value. Certain loans do not have an LTV or CLTV due to industry data availability and portfolios acquired from or serviced by other institutions. Table 6.12: Consumer Loans by LTV/CLTV March 31, 2018 December 31, 2017 (in millions) Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total By LTV/CLTV: 0-60% $ 135,883 15,854 151,737 133,902 16,301 150,203 60.01-80% 103,368 12,274 115,642 104,639 12,918 117,557 80.01-100% 14,297 6,179 20,476 13,924 6,580 20,504 100.01-120% (1) 1,757 2,245 4,002 1,868 2,427 4,295 > 120% (1) 715 902 1,617 783 1,008 1,791 No LTV/CLTV available 1,234 441 1,675 1,073 452 1,525 Government insured/guaranteed loans (2) 14,795 — 14,795 15,143 — 15,143 Total consumer loans (excluding PCI) 272,049 37,895 309,944 271,332 39,686 311,018 Total consumer PCI loans (carrying value) 10,609 25 10,634 12,722 27 12,749 Total consumer loans $ 282,658 37,920 320,578 284,054 39,713 323,767 (1) Reflects total loan balances with LTV/CLTV amounts in excess of 100%. In the event of default, the loss content would generally be limited to only the amount in excess of 100% LTV/CLTV. (2) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. NONACCRUAL LOANS Table 6.13 provides loans on nonaccrual status. PCI loans are excluded from this table because they continue to earn interest from accretable yield, independent of performance in accordance with their contractual terms. Table 6.13: Nonaccrual Loans (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 1,516 1,899 Real estate mortgage 755 628 Real estate construction 45 37 Lease financing 93 76 Total commercial 2,409 2,640 Consumer: Real estate 1-4 family first mortgage (1) 4,053 4,122 Real estate 1-4 family junior lien mortgage 1,087 1,086 Automobile 117 130 Other revolving credit and installment 53 58 Total consumer 5,310 5,396 Total nonaccrual loans (excluding PCI) $ 7,719 8,036 (1) Includes MHFS of $137 million and $136 million at March 31, 2018 , and December 31, 2017 , respectively. LOANS IN PROCESS OF FORECLOSURE Our recorded investment in consumer mortgage loans collateralized by residential real estate property that are in process of foreclosure was $5.9 billion and $6.3 billion at March 31, 2018 and December 31, 2017 , respectively, which included $3.9 billion and $4.0 billion , respectively, of loans that are government insured/guaranteed. We commence the foreclosure process on consumer real estate loans when a borrower becomes 120 days delinquent in accordance with Consumer Finance Protection Bureau Guidelines. Foreclosure procedures and timelines vary depending on whether the property address resides in a judicial or non-judicial state. Judicial states require the foreclosure to be processed through the state’s courts while non-judicial states are processed without court intervention. Foreclosure timelines vary according to state law. LOANS 90 DAYS OR MORE PAST DUE AND STILL ACCRUING Certain loans 90 days or more past due as to interest or principal are still accruing, because they are (1) well-secured and in the process of collection or (2) real estate 1-4 family mortgage loans or consumer loans exempt under regulatory rules from being classified as nonaccrual until later delinquency, usually 120 days past due. PCI loans of $1.0 billion at March 31, 2018 , and $1.4 billion at December 31, 2017 , are not included in these past due and still accruing loans even when they are 90 days or more contractually past due. These PCI loans are considered to be accruing because they continue to earn interest from accretable yield, independent of performance in accordance with their contractual terms. Table 6.14 shows non-PCI loans 90 days or more past due and still accruing by class for loans not government insured/guaranteed. Table 6.14: Loans 90 Days or More Past Due and Still Accruing (in millions) Mar 31, 2018 Dec 31, 2017 Total (excluding PCI): $ 10,753 11,997 Less: FHA insured/guaranteed by the VA (1)(2) 9,786 10,934 Total, not government insured/guaranteed $ 967 1,063 By segment and class, not government insured/guaranteed: Commercial: Commercial and industrial $ 40 26 Real estate mortgage 23 23 Real estate construction 1 — Total commercial 64 49 Consumer: Real estate 1-4 family first mortgage (2) 164 219 Real estate 1-4 family junior lien mortgage (2) 48 60 Credit card 473 492 Automobile 113 143 Other revolving credit and installment 105 100 Total consumer 903 1,014 Total, not government insured/guaranteed $ 967 1,063 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. (2) Includes mortgages held for sale 90 days or more past due and still accruing. IMPAIRED LOANS Table 6.15 summarizes key information for impaired loans. Our impaired loans predominantly include loans on nonaccrual status in the commercial portfolio segment and loans modified in a TDR, whether on accrual or nonaccrual status. These impaired loans generally have estimated losses which are included in the allowance for credit losses. We have impaired loans with no allowance for credit losses when loss content has been previously recognized through charge-offs and we do not anticipate additional charge-offs or losses, or certain loans are currently performing in accordance with their terms and for which no loss has been estimated. Impaired loans exclude PCI loans. Table 6.15 includes trial modifications that totaled $198 million at March 31, 2018 , and $194 million at December 31, 2017 . For additional information on our impaired loans and allowance for credit losses, see Note 1 (Summary of Significant Accounting Policies) in our 2017 Form 10-K. Table 6.15: Impaired Loans Summary Recorded investment (in millions) Unpaid principal balance (1) Impaired loans Impaired loans with related allowance for credit losses Related allowance for credit losses March 31, 2018 Commercial: Commercial and industrial $ 3,182 2,231 1,978 432 Real estate mortgage 1,554 1,307 1,281 196 Real estate construction 105 61 54 8 Lease financing 177 144 144 33 Total commercial 5,018 3,743 3,457 669 Consumer: Real estate 1-4 family first mortgage 13,692 11,934 4,888 618 Real estate 1-4 family junior lien mortgage 2,072 1,860 1,352 230 Credit card 386 386 386 139 Automobile 153 83 34 5 Other revolving credit and installment 146 138 127 33 Total consumer (2) 16,449 14,401 6,787 1,025 Total impaired loans (excluding PCI) $ 21,467 18,144 10,244 1,694 December 31, 2017 Commercial: Commercial and industrial $ 3,577 2,568 2,310 462 Real estate mortgage 1,502 1,239 1,207 211 Real estate construction 95 54 45 9 Lease financing 132 99 89 23 Total commercial 5,306 3,960 3,651 705 Consumer: Real estate 1-4 family first mortgage 14,020 12,225 6,060 770 Real estate 1-4 family junior lien mortgage 2,135 1,918 1,421 245 Credit card 356 356 356 136 Automobile 157 87 34 5 Other revolving credit and installment 136 128 117 29 Total consumer (2) 16,804 14,714 7,988 1,185 Total impaired loans (excluding PCI) $ 22,110 18,674 11,639 1,890 (1) Excludes the unpaid principal balance for loans that have been fully charged off or otherwise have zero recorded investment. (2) Includes the recorded investment of $1.4 billion at both March 31, 2018 and December 31, 2017 , of government insured/guaranteed loans that are predominantly insured by the FHA or guaranteed by the VA and generally do not have an allowance. Impaired loans may also have limited, if any, allowance when the recorded investment of the loan approximates estimated net realizable value as a result of charge-offs prior to a TDR modification. Commitments to lend additional funds on loans whose terms have been modified in a TDR amounted to $559 million and $579 million at March 31, 2018 and December 31, 2017 , respectively. Table 6.16 provides the average recorded investment in impaired loans and the amount of interest income recognized on impaired loans by portfolio segment and class. Table 6.16: Average Recorded Investment in Impaired Loans Quarter ended March 31, 2018 2017 (in millions) Average recorded investment Recognized interest income Average recorded investment Recognized interest income Commercial: Commercial and industrial $ 2,404 36 3,675 33 Real estate mortgage 1,244 28 1,394 27 Real estate construction 58 1 84 1 Lease financing 129 — 119 — Total commercial 3,835 65 5,272 61 Consumer: Real estate 1-4 family first mortgage 12,073 172 14,132 190 Real estate 1-4 family junior lien mortgage 1,889 29 2,131 31 Credit card 370 10 302 8 Automobile 85 3 83 3 Other revolving credit and installment 133 2 106 2 Total consumer 14,550 216 16,754 234 Total impaired loans (excluding PCI) $ 18,385 281 22,026 295 Interest income: Cash basis of accounting $ 81 78 Other (1) 200 217 Total interest income $ 281 295 (1) Includes interest recognized on accruing TDRs, interest recognized related to certain impaired loans which have an allowance calculated using discounting, and amortization of purchase accounting adjustments related to certain impaired loans. TROUBLED DEBT RESTRUCTURINGS (TDRs) When, for economic or legal reasons related to a borrower’s financial difficulties, we grant a concession for other than an insignificant period of time to a borrower that we would not otherwise consider, the related loan is classified as a TDR, the balance of which totaled $17.1 billion and $17.8 billion at March 31, 2018 and December 31, 2017 , respectively. We do not consider loan resolutions such as foreclosure or short sale to be a TDR. We may require some consumer borrowers experiencing financial difficulty to make trial payments generally for a period of three to four months, according to the terms of a planned permanent modification, to determine if they can perform according to those terms. These arrangements represent trial modifications, which we classify and account for as TDRs. While loans are in trial payment programs, their original terms are not considered modified and they continue to advance through delinquency status and accrue interest according to their original terms. Table 6.17 summarizes our TDR modifications for the periods presented by primary modification type and includes the financial effects of these modifications. For those loans that modify more than once, the table reflects each modification that occurred during the period. Loans that both modify and pay off within the period, as well as changes in recorded investment during the period for loans modified in prior periods, are not included in the table. Table 6.17: TDR Modifications Primary modification type (1) Financial effects of modifications (in millions) Principal (2) Interest rate reduction Other concessions (3) Total Charge- offs (4) Weighted average interest rate reduction Recorded investment related to interest rate reduction (5) Quarter ended March 31, 2018 Commercial: Commercial and industrial $ — 9 488 497 6 1.07 % $ 9 Real estate mortgage — 6 98 104 — 1.24 6 Real estate construction — — 3 3 — — — Lease financing — — 39 39 — — — Total commercial — 15 628 643 6 1.15 15 Consumer: Real estate 1-4 family first mortgage 46 10 306 362 1 2.40 35 Real estate 1-4 family junior lien mortgage 1 8 28 37 1 2.22 9 Credit card — 86 — 86 — 11.32 86 Automobile 1 4 14 19 9 6.48 4 Other revolving credit and installment — 15 2 17 — 7.94 15 Trial modifications (6) — — 15 15 — — — Total consumer 48 123 365 536 11 8.20 149 Total $ 48 138 993 1,179 17 7.55 % $ 164 Quarter ended March 31, 2017 Commercial: Commercial and industrial $ — 6 928 934 65 0.82 % $ 6 Real estate mortgage — 14 181 195 — 1.00 14 Real estate construction — — 3 3 — 2.00 — Lease financing — — 3 3 — — — Total commercial — 20 1,115 1,135 65 0.95 20 Consumer: Real estate 1-4 family first mortgage 74 72 291 437

Equity Securities

Equity Securities	3 Months Ended
	Mar. 31, 2018
Equity Securities [Abstract]
Equity Securities	Note 7: Equity Securities Table 7.1 provides a summary of our equity securities by business purpose and accounting model, including equity securities with readily determinable fair values (marketable) and those without readily determinable fair values (nonmarketable). Table 7.1: Equity Securities Mar 31, Dec 31, (in millions) 2018 2017 Held for trading at fair value: Marketable equity securities $ 25,327 30,004 Not held for trading: Fair value: Marketable equity securities (1) 4,931 4,356 Nonmarketable equity securities (2) 5,303 4,867 Total equity securities at fair value 10,234 9,223 Equity method: LIHTC (3) 10,318 10,269 Private equity 3,840 3,839 Tax-advantaged renewable energy 1,822 1,950 New market tax credit and other 268 294 Total equity method 16,248 16,352 Other: Federal bank stock and other at cost (4) 5,780 5,828 Private equity (5) 1,346 1,090 Total equity securities not held for trading 33,608 32,493 Total equity securities $ 58,935 62,497 (1) Includes $ 3.5 billion and $ 3.7 billion at March 31, 2018, and December 31, 2017, respectively, related to securities held as economic hedges of our deferred compensation plan obligations. (2) Includes $ 5.0 billion and $ 4.9 billion at March 31, 2018, and December 31, 2017, respectively, related to investments in which we elected fair value option. See Note 15 (Fair Value of Assets and Liabilities) for additional information. (3) Represents low-income housing tax credit investments. (4) Includes $ 5.7 billion and $ 5.4 billion at March 31, 2018, and December 31, 2017, respectively, related to investments in Federal Reserve Bank and Federal Home Loan Bank stock. (5) Represents nonmarketable equity securities for which we have elected to account for the security under the measurement alternative. Equity Securities Held for Trading Equity securities held for trading purposes are marketable equity securities traded on organized exchanges. These securities, which are held as part of our customer accommodation trading activities, are carried at fair value with changes in fair value reflected in net gains from trading activities. More information on these activities can be found in Note 4 (Trading Activities) to Financial Statements in this Report. Equity Securities Not Held for Trading We also hold equity securities unrelated to trading activities. These securities include private equity and tax credit investments, securities held as economic hedges or to meet regulatory requirements (for example, Federal Reserve Bank and Federal Home Loan Bank stock). Equity securities not held for trading purposes are accounted for at either fair value, equity method, cost or the measurement alternative. FAIR VALUE Equity securities accounted for using the fair value method are recorded at fair value with changes in fair value reflected in net gains from equity securities. Marketable equity securities held for purposes other than trading mostly consist of exchange - traded equity funds held to economically hedge obligations related to our deferred compensation plans and to a lesser extent other holdings of publicly traded equity securities held for investment purposes. Nonmarketable equity securities represent securities that do not have a readily determinable fair value for which we have elected to account for using the fair value method. Substantially all of these nonmarketable equity securities are economically hedged with equity derivatives. EQUITY METHOD Under the equity method of accounting, we carry the security at cost adjusted for our share of the investee’s earnings less any impairment write-downs. Our equity method investments consist of tax credit and private equity securities, the majority of which are our low-income housing tax credit (LIHTC) investments. We invest in affordable housing projects that qualify for the LIHTC, which is designed to promote private development of low-income housing. These investments generate a return mostly through realization of federal tax credit and other tax benefits. In first quarter 2018, we recognized pre-tax losses of $ 280 million related to our LIHTC investments, compared with $230 million in first quarter 2017. These losses were recognized in other noninterest income. We also recognized total tax benefits of $ 359 million in first quarter 2018, which included tax credits recorded to income taxes of $ 290 million . In first quarter 2017, total tax benefits were $ 347 million , which included tax credits of $ 261 million . We are periodically required to provide additional financial support during the investment period. Our liability for unfunded commitments was $ 3.5 billion at March 31, 2018, and $3.6 billion at December 31, 2017. Substantially all of this liability is expected to be paid over the next three years . This liability is included in long-term debt. OTHER The remaining portion of our nonmarketable equity securities portfolio consists of securities accounted for using the cost method or measurement alternative. Cost method securities are held at cost less impairment. If impaired, the carrying value is written down to fair value. The measurement alternative is similar to the cost method of accounting, except the carrying value is adjusted up or down to fair value through net gains from equity securities upon the occurrence of orderly observable transactions in the same or similar security of the same issuer. Impairment write-downs are recorded on these securities when the carrying value of these securities exceeds the fair value of the investment or we identify possible indicators of impairment. Realized Gains and Losses Table 7.2 provides a summary of the net gains and losses for equity securities. Gains and losses for securities held for trading are reported in net gains from trading activities. Table 7.2: Net Gains (Losses) from Equity Securities Quarter ended March 31, (in millions) 2018 2017 Net gains (losses) from equity securities carried at fair value: Marketable equity securities $ 8 283 Nonmarketable equity securities 109 482 Total equity securities carried at fair value 117 765 Net gains (losses) from nonmarketable equity securities not carried at fair value: Impairment write-downs (20 ) (76 ) Net unrealized gains (losses) related to measurement alternative observable transactions 228 — Net realized gains on sale 498 326 All other 18 29 Total nonmarketable equity securities not carried at fair value 724 279 Net gains (losses) from economic hedge derivatives (1) (58 ) (474 ) Total net gains (losses) from equity securities $ 783 570 (1) Includes net gains (losses) on derivatives not designated as hedging instruments. Measurement Alternative Table 7.3 provides additional information about the impairment write-downs and observable price adjustments related to nonmarketable equity securities accounted for under the measurement alternative. Gains and losses related to these adjustments are also included in Table 7.2. Table 7.3: Measurement Alternative Quarter ended March 31, (in millions) 2018 Net gains (losses) recognized in earnings during the period: Gross unrealized gains due to observable price changes $ 228 Gross unrealized losses due to observable price changes — Impairment write-downs (7 ) Realized net gains (losses) from sale 75 Total net gains (losses) recognized during the period $ 296 Cumulative gains (losses) due to observable price changes (1): Gross unrealized gains $ 228 Gross unrealized losses — (1) Cumulative balances are recorded for nonmarketable equity securities accounted for under the measurement alternative that are recognized on the balance sheet as of March 31, 2018.

Other Assets

Other Assets	3 Months Ended
	Mar. 31, 2018
Other Assets [Abstract]
Other Assets	Note 8: Other Assets Table 8.1 presents the components of other assets. Table 8.1: Other Assets (in millions) Mar 31, Dec 31, Corporate/bank-owned life insurance $ 19,589 19,549 Accounts receivable (1) 37,322 39,127 Interest receivable 5,824 5,688 Core deposit intangibles 577 769 Customer relationship and other amortized intangibles 766 841 Foreclosed assets: Residential real estate: Government insured/guaranteed (1) 103 120 Non-government insured/guaranteed 239 252 Non-residential real estate 229 270 Operating lease assets 9,382 9,666 Due from customers on acceptances 196 177 Other 11,661 13,785 Total other assets $ 85,888 90,244 (1) Certain government-guaranteed residential real estate mortgage loans upon foreclosure are included in Accounts receivable. Both principal and interest related to these foreclosed real estate assets are collectible because the loans were predominantly insured by the FHA or guaranteed by the VA. For more information on the classification of certain government-guaranteed mortgage loans upon foreclosure, see Note 1 (Summary of Significant Accounting Policies) to Financial Statements in our 2017 10-K.

Securitizations and Variable In

Securitizations and Variable Interest Entities	3 Months Ended
	Mar. 31, 2018
Securitizations and Variable Interest Entities [Abstract]
Securitizations and Variable Interest Entities	Note 9: Securitizations and Variable Interest Entities Involvement with Special Purpose Entities (SPEs) In the normal course of business, we enter into various types of on- and off-balance sheet transactions with SPEs, which are corporations, trusts, limited liability companies or partnerships that are established for a limited purpose. Generally, SPEs are formed in connection with securitization transactions and are considered variable interest entities (VIEs). For further description of our involvement with SPEs, see Note 8 (Securitizations and Variable Interest Entities) to Financial Statements in our 2017 Form 10-K. We have segregated our involvement with VIEs between those VIEs which we consolidate, those which we do not consolidate and those for which we account for the transfers of financial assets as secured borrowings. Secured borrowings are transactions involving transfers of our financial assets to third parties that are accounted for as financings with the assets pledged as collateral. Accordingly, the transferred assets remain recognized on our balance sheet. Subsequent tables within this Note further segregate these transactions by structure type. Table 9.1 provides the classifications of assets and liabilities in our balance sheet for our transactions with VIEs. Table 9.1: Balance Sheet Transactions with VIEs (in millions) VIEs that we do not consolidate VIEs that we consolidate Transfers that we account for as secured borrowings Total March 31, 2018 Cash $ — 111 — 111 Interest-earning deposits with banks — 8 — 8 Debt securities: Trading debt securities 2,011 — 200 2,211 Available-for-sale debt securities (1) 3,405 — 343 3,748 Held-to-maturity debt securities 502 — — 502 Loans 2,766 13,007 106 15,879 Mortgage servicing rights 14,977 — — 14,977 Derivative assets 124 — — 124 Equity securities 10,683 28 — 10,711 Other assets — 230 7 237 Total assets 34,468 13,384 656 48,508 Short-term borrowings — — 512 512 Derivative liabilities 45 4 (2) — 49 Accrued expenses and other liabilities 245 127 (2) 10 382 Long-term debt 3,507 947 (2) 107 4,561 Total liabilities 3,797 1,078 629 5,504 Noncontrolling interests — 31 — 31 Net assets $ 30,671 12,275 27 42,973 December 31, 2017 Cash $ — 116 — 116 Interest-earning deposits with banks — 371 — 371 Debt securities: Trading debt securities 1,305 — 201 1,506 Available-for-sale debt securities (1) 3,288 — 358 3,646 Held-to-maturity debt securities 485 — — 485 Loans 4,274 12,482 110 16,866 Mortgage servicing rights 13,628 — — 13,628 Derivative assets 44 — — 44 Equity securities 10,740 306 — 11,046 Other assets — 342 6 348 Total assets 33,764 13,617 675 48,056 Short-term borrowings — — 522 522 Derivative liabilities 106 5 (2) — 111 Accrued expenses and other liabilities 244 132 (2) 10 386 Long-term debt 3,590 1,479 (2) 111 5,180 Total liabilities 3,940 1,616 643 6,199 Noncontrolling interests — 283 — 283 Net assets $ 29,824 11,718 32 41,574 (1) Excludes certain debt securities related to loans serviced for the Federal National Mortgage Association (FNMA), Federal Home Loan Mortgage Corporation (FHLMC) and GNMA. (2) There were no VIE liabilities with recourse to the general credit of Wells Fargo for the periods presented. Transactions with Unconsolidated VIEs Our transactions with unconsolidated VIEs include securitizations of residential mortgage loans, CRE loans, student loans, automobile loans and leases, certain dealer floorplan loans; investment and financing activities involving collateralized debt obligations (CDOs) backed by asset-backed and CRE securities, tax credit structures, collateralized loan obligations (CLOs) backed by corporate loans, and other types of structured financing. We have various forms of involvement with VIEs, including servicing, holding senior or subordinated interests, entering into liquidity arrangements, credit default swaps and other derivative contracts. Involvements with these unconsolidated VIEs are recorded on our balance sheet in debt and equity securities, loans, MSRs, derivative assets and liabilities, other assets, other liabilities, and long-term debt, as appropriate. Table 9.2 provides a summary of unconsolidated VIEs with which we have significant continuing involvement, but we are not the primary beneficiary. We do not consider our continuing involvement in an unconsolidated VIE to be significant when it relates to third-party sponsored VIEs for which we were not the transferor (unless we are servicer and have other significant forms of involvement) or if we were the sponsor only or sponsor and servicer but do not have any other forms of significant involvement. Significant continuing involvement includes transactions where we were the sponsor or transferor and have other significant forms of involvement. Sponsorship includes transactions with unconsolidated VIEs where we solely or materially participated in the initial design or structuring of the entity or marketing of the transaction to investors. When we transfer assets to a VIE and account for the transfer as a sale, we are considered the transferor. We consider investments in securities (other than those held temporarily in trading), loans, guarantees, liquidity agreements, written options and servicing of collateral to be other forms of involvement that may be significant. We have excluded certain transactions with unconsolidated VIEs from the balances presented in the following table where we have determined that our continuing involvement is not significant due to the temporary nature and size of our variable interests, because we were not the transferor or because we were not involved in the design of the unconsolidated VIEs. We also exclude from the table secured borrowing transactions with unconsolidated VIEs (for information on these transactions, see the Transactions with Consolidated VIEs and Secured Borrowings section in this Note). Table 9.2: Unconsolidated VIEs Carrying value – asset (liability) (in millions) Total VIE assets Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Net assets March 31, 2018 Residential mortgage loan securitizations: Conforming (2) $ 1,171,619 2,851 14,044 — (190 ) 16,705 Other/nonconforming 13,057 552 68 — — 620 Commercial mortgage securitizations 146,886 2,350 865 (43 ) (35 ) 3,137 Collateralized debt obligations: Debt securities 1,010 — — 5 (20 ) (15 ) Loans (3) — — — — — — Asset-based finance structures 2,192 1,749 — — — 1,749 Tax credit structures 32,270 11,345 — — (3,507 ) 7,838 Collateralized loan obligations 7 — — — — — Investment funds 212 51 — — — 51 Other (4) 2,002 469 — 117 — 586 Total $ 1,369,255 19,367 14,977 79 (3,752 ) 30,671 Maximum exposure to loss Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Total exposure Residential mortgage loan securitizations: Conforming $ 2,851 14,044 — 1,257 18,152 Other/nonconforming 552 68 — — 620 Commercial mortgage securitizations 2,350 865 45 10,328 13,588 Collateralized debt obligations: Debt securities — — 5 20 25 Loans (3) — — — — — Asset-based finance structures 1,749 — — 71 1,820 Tax credit structures 11,345 — — 1,242 12,587 Collateralized loan obligations — — — — — Investment funds 51 — — — 51 Other (4) 469 — 134 157 760 Total $ 19,367 14,977 184 13,075 47,603 (continued on following page) (continued from previous page) Carrying value – asset (liability) (in millions) Total VIE assets Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Net assets December 31, 2017 Residential mortgage loan securitizations: Conforming (2) $ 1,169,410 2,100 12,665 — (190 ) 14,575 Other/nonconforming 14,175 598 73 — — 671 Commercial mortgage securitizations 144,650 2,198 890 28 (34 ) 3,082 Collateralized debt obligations: Debt securities 1,031 — — 5 (20 ) (15 ) Loans (3) 1,481 1,443 — — — 1,443 Asset-based finance structures 2,333 1,867 — — — 1,867 Tax credit structures 31,852 11,258 — — (3,590 ) 7,668 Collateralized loan obligations 23 1 — — — 1 Investment funds 225 50 — — — 50 Other (4) 2,257 577 — (95 ) — 482 Total $ 1,367,437 20,092 13,628 (62 ) (3,834 ) 29,824 Maximum exposure to loss Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Total exposure Residential mortgage loan securitizations: Conforming $ 2,100 12,665 — 1,137 15,902 Other/nonconforming 598 73 — — 671 Commercial mortgage securitizations 2,198 890 42 10,202 13,332 Collateralized debt obligations: Debt securities — — 5 20 25 Loans (3) 1,443 — — — 1,443 Asset-based finance structures 1,867 — — 71 1,938 Tax credit structures 11,258 — — 1,175 12,433 Collateralized loan obligations 1 — — — 1 Investment funds 50 — — — 50 Other (4) 577 — 120 157 854 Total $ 20,092 13,628 167 12,762 46,649 (1) Includes total equity interests of $10.7 billion at both March 31, 2018 , and December 31, 2017 . Also includes debt interests in the form of both loans and securities. Excludes certain debt securities held related to loans serviced for FNMA, FHLMC and GNMA. (2) Excludes assets and related liabilities with a recorded carrying value on our balance sheet of $1.2 billion and $2.2 billion at March 31, 2018 , and December 31, 2017 , respectively, for certain delinquent loans that are eligible for repurchase from GNMA loan securitizations. The recorded carrying value represents the amount that would be payable if the Company was to exercise the repurchase option. The carrying amounts are excluded from the table because the loans eligible for repurchase do not represent interests in the VIEs. (3) Represents senior loans to trusts that are collateralized by asset-backed securities. The trusts invested in senior tranches from a diversified pool of U.S. asset securitizations, of which all were current and 100% were rated as investment grade by the primary rating agencies at December 31, 2017 . These senior loans were accounted for at amortized cost and were subject to the Company’s allowance and credit charge-off policies. The securitization was terminated in first quarter 2018. (4) Includes structured financing and credit-linked note structures. Also contains investments in auction rate securities (ARS) issued by VIEs that we do not sponsor and, accordingly, are unable to obtain the total assets of the entity. In Table 9.2 , “Total VIE assets” represents the remaining principal balance of assets held by unconsolidated VIEs using the most current information available. For VIEs that obtain exposure to assets synthetically through derivative instruments, the remaining notional amount of the derivative is included in the asset balance. “Carrying value” is the amount in our consolidated balance sheet related to our involvement with the unconsolidated VIEs. “Maximum exposure to loss” from our involvement with off-balance sheet entities, which is a required disclosure under GAAP, is determined as the carrying value of our involvement with off-balance sheet (unconsolidated) VIEs plus the remaining undrawn liquidity and lending commitments, the notional amount of net written derivative contracts, and generally the notional amount of, or stressed loss estimate for, other commitments and guarantees. It represents estimated loss that would be incurred under severe, hypothetical circumstances, for which we believe the possibility is extremely remote, such as where the value of our interests and any associated collateral declines to zero, without any consideration of recovery or offset from any economic hedges. Accordingly, this required disclosure is not an indication of expected loss. For complete descriptions of our types of transactions with unconsolidated VIEs with which we have a significant continuing involvement, but we are not the primary beneficiary, see Note 8 (Securitizations and Variable Interest Entities) to Financial Statements in our 2017 Form 10-K. INVESTMENT FUNDS Subsequent to adopting ASU 2015-02 ( Amendments to the Consolidation Analysis ) in first quarter 2016, we do not consolidate these investment funds because we do not hold variable interests that are considered significant to the funds. We voluntarily waived a portion of our management fees for certain money market funds that are exempt from the consolidation analysis to ensure the funds maintained a minimum level of daily net investment income. The amount of fees waived was $13 million and $14 million in first quarter 2018 and 2017 , respectively. OTHER TRANSACTIONS WITH VIEs Other VIEs include certain entities that issue auction rate securities (ARS) which are debt instruments with long-term maturities, that re-price more frequently, and preferred equities with no maturity. At March 31, 2018 , we held $292 million of ARS issued by VIEs compared with $400 million at December 31, 2017 . We acquired the ARS pursuant to agreements entered into in 2008 and 2009. We do not consolidate the VIEs that issued the ARS because we do not have power over the activities of the VIEs. TRUST PREFERRED SECURITIES VIEs that we wholly own issue debt securities or preferred equity to third party investors. All of the proceeds of the issuance are invested in debt securities or preferred equity that we issue to the VIEs. The VIEs’ operations and cash flows relate only to the issuance, administration and repayment of the securities held by third parties. We do not consolidate these VIEs because the sole assets of the VIEs are receivables from us, even though we own all of the voting equity shares of the VIEs, have fully guaranteed the obligations of the VIEs and may have the right to redeem the third party securities under certain circumstances. In our consolidated balance sheet at March 31, 2018 , and December 31, 2017 , we reported the debt securities issued to the VIEs as long-term junior subordinated debt with a carrying value of $2.0 billion at both dates and the preferred equity securities issued to the VIEs as preferred stock with a carrying value of $2.5 billion at both dates. These amounts are in addition to the involvements in these VIEs included in the preceding table. Loan Sales and Securitization Activity We periodically transfer consumer and CRE loans and other types of financial assets in securitization and whole loan sale transactions. We typically retain the servicing rights from these sales and may continue to hold other beneficial interests in the transferred financial assets. We may also provide liquidity to investors in the beneficial interests and credit enhancements in the form of standby letters of credit. Through these transfers we may be exposed to liability under limited amounts of recourse as well as standard representations and warranties we make to purchasers and issuers. Table 9.3 presents the cash flows for our transfers accounted for as sales. Table 9.3: Cash Flows From Sales and Securitization Activity 2018 2017 (in millions) Mortgage loans Other financial assets Mortgage loans Other financial assets Quarter ended March 31, Proceeds from securitizations and whole loan sales $ 50,587 — 58,257 21 Fees from servicing rights retained 845 — 854 — Cash flows from other interests held (1) 185 — 834 — Repurchases of assets/loss reimbursements (2): Non-agency securitizations and whole loan transactions 1 — 2 — Agency securitizations (3) 33 — 23 — Servicing advances, net of repayments (36 ) — (142 ) — (1) Cash flows from other interests held include principal and interest payments received on retained bonds and excess cash flows received on interest-only strips. (2) Consists of cash paid to repurchase loans from investors and cash paid to investors to reimburse them for losses on individual loans that are already liquidated. (3) Represent loans repurchased from GNMA, FNMA, and FHLMC under representation and warranty provisions included in our loan sales contracts. First quarter 2018 and 2017 exclude $ 2.9 billion and $2.3 billion , respectively, in delinquent insured/guaranteed loans that we service and have exercised our option to purchase out of GNMA pools. These loans are predominantly insured by the FHA or guaranteed by the VA. In first quarter 2018 and 2017 , we recognized net gains of $700 million and $132 million , respectively, from transfers accounted for as sales of financial assets. These net gains predominantly relate to whole loans sales, commercial mortgage securitizations, and residential mortgage securitizations where the loans were not already carried at fair value. Sales with continuing involvement during first quarter 2018 and 2017 l argely related to securitizations of residential mortgages that are sold to the government-sponsored entities (GSEs), including FNMA, FHLMC and GNMA (conforming residential mortgage securitizations). During first quarter 2018 and 2017 , we transferred $47.3 billion and $55.5 billion , respectively, in fair value of residential mortgages to unconsolidated VIEs and third-party investors and recorded the transfers as sales. Substantially all of these transfers did not result in a gain or loss because the loans were already carried at fair value. In connection with all of these transfers, in first quarter 2018 , we recorded a $533 million servicing asset, measured at fair value using a Level 3 measurement technique, securities of $3.8 billion , classified as Level 2, and a $3 million liability for repurchase losses which reflects management’s estimate of probable losses related to various representations and warranties for the loans transferred, initially measured at fair value. In first quarter 2017 , we recorded a $546 million servicing asset, securities of $2.8 billion , and an $8 million liability. Table 9.4 presents the key weighted-average assumptions we used to measure residential mortgage servicing rights at the date of securitization. Table 9.4: Residential Mortgage Servicing Rights Residential mortgage servicing rights 2018 2017 Quarter ended March 31, Prepayment speed (1) 9.6 % 10.3 Discount rate 7.3 6.8 Cost to service ($ per loan) (2) $ 117 134 (1) The prepayment speed assumption for residential mortgage servicing rights includes a blend of prepayment speeds and default rates. Prepayment speed assumptions are influenced by mortgage interest rate inputs as well as our estimation of drivers of borrower behavior. (2) Includes costs to service and unreimbursed foreclosure costs, which can vary period to period depending on the mix of modified government-guaranteed loans sold to GNMA. During first quarter 2018 and 2017 , we transferred $3.1 billion and $3.3 billion , respectively, in carrying value of commercial mortgages to unconsolidated VIEs and third-party investors and recorded the transfers as sales. These transfers resulted in gains of $69 million and $96 million for the same periods, respectively, because the loans were carried at lower of cost or market value (LOCOM). In connection with these transfers, in first quarter 2018 , we recorded a servicing asset of $34 million , initially measured at fair value using a Level 3 measurement technique, and no securities. In first quarter 2017 , we recorded a servicing asset of $45 million and no securities. Retained Interests from Unconsolidated VIEs Table 9.5 provides key economic assumptions and the sensitivity of the current fair value of residential mortgage servicing rights and other interests held to immediate adverse changes in those assumptions. “Other interests held” relate to residential and commercial mortgage loan securitizations. Residential mortgage-backed securities retained in securitizations issued through GSEs, such as FNMA, FHLMC and GNMA, are excluded from the table because these securities have a remote risk of credit loss due to the GSE guarantee. These securities also have economic characteristics similar to GSE mortgage-backed securities that we purchase, which are not included in the table. Subordinated interests include only those bonds whose credit rating was below AAA by a major rating agency at issuance. Senior interests include only those bonds whose credit rating was AAA by a major rating agency at issuance. The information presented excludes trading positions held in inventory. Table 9.5: Retained Interests from Unconsolidated VIEs Other interests held Residential mortgage servicing rights (1) Interest-only strips Commercial (2) ($ in millions, except cost to service amounts) Subordinated bonds Senior bonds Fair value of interests held at March 31, 2018 $ 15,041 18 611 443 Expected weighted-average life (in years) 6.8 3.6 6.4 5.0 Key economic assumptions: Prepayment speed assumption (3) 9.3 % 18.3 Decrease in fair value from: 10% adverse change $ 546 1 25% adverse change 1,298 2 Discount rate assumption 7.2 % 15.4 3.8 3.5 Decrease in fair value from: 100 basis point increase $ 729 — 42 18 200 basis point increase 1,394 1 71 36 Cost to service assumption ($ per loan) 136 Decrease in fair value from: 10% adverse change 451 25% adverse change 1,127 Credit loss assumption 8.0 — Decrease in fair value from: 10% higher losses 13 — 25% higher losses 17 — Fair value of interests held at December 31, 2017 $ 13,625 19 596 468 Expected weighted-average life (in years) 6.2 3.3 6.7 5.2 Key economic assumptions: Prepayment speed assumption (3) 10.5 % 20.0 Decrease in fair value from: 10% adverse change $ 565 1 25% adverse change 1,337 2 Discount rate assumption 6.9 % 14.8 4.1 3.1 Decrease in fair value from: 100 basis point increase $ 652 — 32 20 200 basis point increase 1,246 1 61 39 Cost to service assumption ($ per loan) 143 Decrease in fair value from: 10% adverse change 467 25% adverse change 1,169 Credit loss assumption 1.8 — Decrease in fair value from: 10% higher losses — — 25% higher losses — — (1) See narrative following this table for a discussion of commercial mortgage servicing rights. (2) Prepayment speed assumptions do not significantly impact the value of commercial mortgage securitization bonds as the underlying commercial mortgage loans experience significantly lower prepayments due to certain contractual restrictions, impacting the borrower’s ability to prepay the mortgage. (3) The prepayment speed assumption for residential mortgage servicing rights includes a blend of prepayment speeds and default rates. Prepayment speed assumptions are influenced by mortgage interest rate inputs as well as our estimation of drivers of borrower behavior. In addition to residential mortgage servicing rights (MSRs) included in the previous table, we have a small portfolio of commercial MSRs with a fair value of $2.3 billion and $2.0 billion at March 31, 2018 , and December 31, 2017 , respectively. The nature of our commercial MSRs, which are carried at LOCOM, is different from our residential MSRs. Prepayment activity on serviced loans does not significantly impact the value of commercial MSRs because, unlike residential mortgages, commercial mortgages experience significantly lower prepayments due to certain contractual restrictions, impacting the borrower’s ability to prepay the mortgage. Additionally, for our commercial MSR portfolio, we are typically master/primary servicer, but not the special servicer, who is separately responsible for the servicing and workout of delinquent and foreclosed loans. It is the special servicer, similar to our role as servicer of residential mortgage loans, who is affected by higher servicing and foreclosure costs due to an increase in delinquent and foreclosed loans. Accordingly, prepayment speeds and costs to service are not key assumptions for commercial MSRs as they do not significantly impact the valuation. The primary economic driver impacting the fair value of our commercial MSRs is forward interest rates, which are derived from market observable yield curves used to price capital markets instruments. Market interest rates significantly affect interest earned on custodial deposit balances. The sensitivity of the current fair value to an immediate adverse 25% change in the assumption about interest earned on deposit balances at March 31, 2018 , and December 31, 2017 , results in a decrease in fair value of $325 million and $278 million , respectively. See Note 10 (Mortgage Banking Activities) for further information on our commercial MSRs. We also have a loan to an unconsolidated third party VIE that we extended in fourth quarter 2014 in conjunction with our sale of government guaranteed student loans. The loan is carried at amortized cost and approximates fair value at March 31, 2018 , and December 31, 2017 . The carrying amount of the loan at March 31, 2018 , and December 31, 2017 , was $1.2 billion and $1.3 billion , respectively. The estimated fair value of the loan is considered a Level 3 measurement that is determined using discounted cash flows that are based on changes in the discount rate due to changes in the risk premium component (credit spreads). The primary economic assumption impacting the fair value of our loan is the discount rate. Changes in the credit loss assumption are not expected to affect the estimated fair value of the loan due to the government guarantee of the underlying collateral. The sensitivity of the current fair value to an immediate adverse increase of 200 basis points in the risk premium component of the discount rate assumption is a decrease in fair value of $19 million and $25 million at March 31, 2018 , and December 31, 2017 , respectively. The sensitivities in the preceding paragraphs and table are hypothetical and caution should be exercised when relying on this data. Changes in value based on variations in assumptions generally cannot be extrapolated because the relationship of the change in the assumption to the change in value may not be linear. Also, the effect of a variation in a particular assumption on the value of the other interests held is calculated independently without changing any other assumptions. In reality, changes in one factor may result in changes in others (for example, changes in prepayment speed estimates could result in changes in the credit losses), which might magnify or counteract the sensitivities. Off-Balance Sheet Loans Table 9.6 presents information about the principal balances of off-balance sheet loans that were sold or securitized, including residential mortgage loans sold to FNMA, FHLMC, GNMA and other investors, for which we have some form of continuing involvement (including servicer). Delinquent loans include loans 90 days or more past due and loans in bankruptcy, regardless of delinquency status. For loans sold or securitized where servicing is our only form of continuing involvement, we would only experience a loss if we were required to repurchase a delinquent loan or foreclosed asset due to a breach in representations and warranties associated with our loan sale or servicing contracts. Table 9.6: Off-Balance Sheet Loans Sold or Securitized Net charge-offs Total loans Delinquent loans and foreclosed assets (1) Quarter ended Mar 31, (in millions) Mar 31, 2018 Dec 31, 2017 Mar 31, 2018 Dec 31, 2017 2018 2017 Commercial: Real estate mortgage $ 101,784 100,875 2,622 2,839 10 295 Total commercial 101,784 100,875 2,622 2,839 10 295 Consumer: Real estate 1-4 family first mortgage 1,122,010 1,126,208 11,823 13,393 116 200 Total consumer 1,122,010 1,126,208 11,823 13,393 116 200 Total off-balance sheet sold or securitized loans (2) $ 1,223,794 1,227,083 14,445 16,232 126 495 (1) Includes $1.2 billion of commercial foreclosed assets at both dates and $892 million and $879 million of consumer foreclosed assets at March 31, 2018 , and December 31, 2017 , respectively. (2) At March 31, 2018 , and December 31, 2017 , the table includes total loans of $1.1 trillion at both dates, delinquent loans of $7.9 billion and $9.1 billion , and foreclosed assets of $628 million and $619 million , respectively, for FNMA, FHLMC and GNMA. Net charge-offs exclude loans sold to FNMA, FHLMC and GNMA as we do not service or manage the underlying real estate upon foreclosure and, as such, do not have access to net charge-off information. Transactions with Consolidated VIEs and Secured Borrowings Table 9.7 presents a summary of financial assets and liabilities for asset transfers accounted for as secured borrowings and involvements with consolidated VIEs. Carrying values of “Assets” are presented using GAAP measurement methods, which may include fair value, credit impairment or other adjustments, and therefore in some instances will differ from “Total VIE assets.” For VIEs that obtain exposure synthetically through derivative instruments, the remaining notional amount of the derivative is included in “Total VIE assets.” On the consolidated balance sheet, we separately disclose the consolidated assets of certain VIEs that can only be used to settle the liabilities of those VIEs. Table 9.7: Transactions with Consolidated VIEs and Secured Borrowings Carrying value (in millions) Total VIE assets Assets Liabilities Noncontrolling interests Net assets March 31, 2018 Secured borrowings: Municipal tender option bond securitizations $ 647 550 (522 ) — 28 Residential mortgage securitizations 109 106 (107 ) — (1 ) Total secured borrowings 756 656 (629 ) — 27 Consolidated VIEs: Commercial and industrial loans and leases 8,652 8,607 (420 ) (10 ) 8,177 Nonconforming residential mortgage loan securitizations 2,386 2,092 (653 ) — 1,439 Commercial real estate loans 2,594 2,594 — — 2,594 Structured asset finance 7 5 (4 ) — 1 Investment funds 24 24 — — 24 Other 70 62 (1 ) (21 ) 40 Total consolidated VIEs 13,733 13,384 (1,078 ) (31 ) 12,275 Total secured borrowings and consolidated VIEs $ 14,489 14,040 (1,707 ) (31 ) 12,302 December 31, 2017 Secured borrowings: Municipal tender option bond securitizations $ 658 565 (532 ) — 33 Residential mortgage securitizations 113 110 (111 ) — (1 ) Total secured borrowings 771 675 (643 ) — 32 Consolidated VIEs: Commercial and industrial loans and leases 9,116 8,626 (915 ) (29 ) 7,682 Nonconforming residential mortgage loan securitizations 2,515 2,212 (694 ) — 1,518 Commercial real estate loans 2,378 2,378 — — 2,378 Structured asset finance 10 6 (4 ) — 2 Investment funds 305 305 (2 ) (230 ) 73 Other 100 90 (1 ) (24 ) 65 Total consolidated VIEs 14,424 13,617 (1,616 ) (283 ) 11,718 Total secured borrowings and consolidated VIEs $ 15,195 14,292 (2,259 ) (283 ) 11,750 INVESTMENT FUNDS Subsequent to adopting ASU 2015-02 – Amendments to the Consolidation Analysis in first quarter 2016, we consolidate certain investment funds because we have both the power to manage fund assets and hold variable interests that are considered significant. For complete descriptions of our accounting for transfers accounted for as secured borrowings and involvements with consolidated VIEs, see Note 8 (Securitizations and Variable Interest Entities) to Financial Statements in our 2017 Form 10-K.

Mortgage Banking Activities

Mortgage Banking Activities	3 Months Ended
	Mar. 31, 2018
Mortgage Banking Activities [Abstract]
Mortgage Banking Activities	Note 10: Mortgage Banking Activities Mortgage banking activities, included in the Community Banking and Wholesale Banking operating segments, consist of residential and commercial mortgage originations, sale activity and servicing. We apply the amortization method to commercial MSRs and apply the fair value method to residential MSRs. Table 10.1 presents the changes in MSRs measured using the fair value method. Table 10.1: Analysis of Changes in Fair Value MSRs Quarter ended March 31, (in millions) 2018 2017 Fair value, beginning of period $ 13,625 12,959 Servicing from securitizations or asset transfers (1) 573 583 Sales and other (2) (4 ) (47 ) Net additions 569 536 Changes in fair value: Due to changes in valuation model inputs or assumptions: Mortgage interest rates (3) 1,253 152 Servicing and foreclosure costs (4) 34 27 Prepayment estimates and other (5) 43 (5 ) Net changes in valuation model inputs or assumptions 1,330 174 Changes due to collection/realization of expected cash flows over time (483 ) (461 ) Total changes in fair value 847 (287 ) Fair value, end of period $ 15,041 13,208 (1) Includes impacts associated with exercising our right to repurchase delinquent loans from GNMA loan securitization pools. (2) Includes sales and transfers of MSRs, which can result in an increase of total reported MSRs if the sales or transfers are related to nonperforming loan portfolios or portfolios with servicing liabilities. (3) Includes prepayment speed changes as well as other valuation changes due to changes in mortgage interest rates (such as changes in estimated interest earned on custodial deposit balances). (4) Includes costs to service and unreimbursed foreclosure costs. (5) Represents changes driven by other valuation model inputs or assumptions including prepayment speed estimation changes and other assumption updates. Prepayment speed estimation changes are influenced by observed changes in borrower behavior and other external factors that occur independent of interest rate changes. Table 10.2 presents the changes in amortized MSRs. Table 10.2: Analysis of Changes in Amortized MSRs Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 1,424 1,406 Purchases 18 18 Servicing from securitizations or asset transfers 34 45 Amortization (65 ) (67 ) Balance, end of period (1) $ 1,411 1,402 Fair value of amortized MSRs: Beginning of period $ 2,025 1,956 End of period 2,307 2,051 (1) Commercial amortized MSRs are evaluated for impairment purposes by the following risk strata: agency (GSEs) for multi-family properties and non-agency. There was no valuation allowance recorded for the periods presented on the commercial amortized MSRs. We present the components of our managed servicing portfolio in Table 10.3 at unpaid principal balance for loans serviced and subserviced for others and at book value for owned loans serviced. Table 10.3: Managed Servicing Portfolio (in billions) Mar 31, 2018 Dec 31, 2017 Residential mortgage servicing: Serviced for others $ 1,201 1,209 Owned loans serviced 337 342 Subserviced for others 5 3 Total residential servicing 1,543 1,554 Commercial mortgage servicing: Serviced for others 510 495 Owned loans serviced 125 127 Subserviced for others 10 9 Total commercial servicing 645 631 Total managed servicing portfolio $ 2,188 2,185 Total serviced for others $ 1,711 1,704 Ratio of MSRs to related loans serviced for others 0.96 % 0.88 Table 10.4 presents the components of mortgage banking noninterest income. Table 10.4: Mortgage Banking Noninterest Income Quarter ended March 31, (in millions) 2018 2017 Servicing income, net: Servicing fees: Contractually specified servicing fees $ 916 907 Late charges 44 48 Ancillary fees 40 50 Unreimbursed direct servicing costs (1) (94 ) (123 ) Net servicing fees 906 882 Changes in fair value of MSRs carried at fair value: Due to changes in valuation model inputs or assumptions (2) (A) 1,330 174 Changes due to collection/realization of expected cash flows over time (483 ) (461 ) Total changes in fair value of MSRs carried at fair value 847 (287 ) Amortization (65 ) (67 ) Net derivative losses from economic hedges (3) (B) (1,220 ) (72 ) Total servicing income, net 468 456 Net gains on mortgage loan origination/sales activities 466 772 Total mortgage banking noninterest income $ 934 1,228 Market-related valuation changes to MSRs, net of hedge results (2)(3) (A)+(B) $ 110 102 (1) Includes costs associated with foreclosures, unreimbursed interest advances to investors, and other interest costs. (2) Refer to the analysis of changes in fair value MSRs presented in Table 10.1 in this Note for more detail. (3) Represents results from economic hedges used to hedge the risk of changes in fair value of MSRs. See Note 14 (Derivatives Not Designated as Hedging Instruments) for additional discussion and detail. Table 10.5 summarizes the changes in our liability for mortgage loan repurchase losses. This liability is in “Accrued expenses and other liabilities” in our consolidated balance sheet and adjustments to the repurchase liability are recorded in net gains on mortgage loan origination/sales activities in “Mortgage banking” in our consolidated income statement. Because of the uncertainty in the various estimates underlying the mortgage repurchase liability, there is a range of losses in excess of the recorded mortgage repurchase liability that is reasonably possible. The estimate of the range of possible loss for representations and warranties does not represent a probable loss, and is based on currently available information, significant judgment, and a number of assumptions that are subject to change. The high end of this range of reasonably possible losses exceeded our recorded liability by $166 million at March 31, 2018 , and was determined based upon modifying the assumptions (particularly to assume significant changes in investor repurchase demand practices) used in our best estimate of probable loss to reflect what we believe to be the high end of reasonably possible adverse assumptions. Table 10.5: Analysis of Changes in Liability for Mortgage Loan Repurchase Losses Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 181 229 Provision for repurchase losses: Loan sales 3 8 Change in estimate (1) 1 (8 ) Net additions to provision 4 — Losses (4 ) (7 ) Balance, end of period $ 181 222 (1) Results from changes in investor demand and mortgage insurer practices, credit deterioration and changes in the financial stability of correspondent lenders.

Intangible Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Note 11: Intangible Assets Table 11.1 presents the gross carrying value of intangible assets and accumulated amortization. Table 11.1: Intangible Assets March 31, 2018 December 31, 2017 (in millions) Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value Amortized intangible assets (1): MSRs (2) $ 3,928 (2,517 ) 1,411 3,876 (2,452 ) 1,424 Core deposit intangibles 12,834 (12,257 ) 577 12,834 (12,065 ) 769 Customer relationship and other intangibles 3,994 (3,228 ) 766 3,994 (3,153 ) 841 Total amortized intangible assets $ 20,756 (18,002 ) 2,754 20,704 (17,670 ) 3,034 Unamortized intangible assets: MSRs (carried at fair value) (2) $ 15,041 13,625 Goodwill 26,445 26,587 Trademark 14 14 (1) Excludes fully amortized intangible assets. (2) See Note 10 (Mortgage Banking Activities) for additional information on MSRs. Table 11.2 provides the current year and estimated future amortization expense for amortized intangible assets. We based our projections of amortization expense shown below on existing asset balances at March 31, 2018 . Future amortization expense may vary from these projections. Table 11.2: Amortization Expense for Intangible Assets (in millions) Amortized MSRs Core deposit intangibles Customer relationship and other intangibles (1) Total Three months ended March 31, 2018 (actual) $ 65 192 75 332 Estimate for the remainder of 2018 $ 202 577 223 1,002 Estimate for year ended December 31, 2019 229 — 116 345 2020 199 — 97 296 2021 172 — 82 254 2022 155 — 68 223 2023 128 — 59 187 (1) The three months ended March 31, 2018 balance includes $2 million for lease intangible amortization. Table 11.3 shows the allocation of goodwill to our reportable operating segments. Table 11.3: Goodwill (in millions) Community Banking Wholesale Banking Wealth and Investment Management Consolidated Company December 31, 2016 $ 16,849 8,585 1,259 26,693 Reduction in goodwill related to divested businesses and other — (27 ) — (27 ) March 31, 2017 $ 16,849 8,558 1,259 26,666 December 31, 2017 $ 16,849 8,455 1,283 26,587 Reduction in goodwill related to divested businesses and other (142 ) — — (142 ) March 31, 2018 $ 16,707 8,455 1,283 26,445 We assess goodwill for impairment at a reporting unit level, which is one level below the operating segments. See Note 21 (Operating Segments) for further information on management reporting.

Guarantees, Pledged Assets and

Guarantees, Pledged Assets and Collateral	3 Months Ended
	Mar. 31, 2018
Guarantees [Abstract]
Guarantees, Pledged Assets and Collateral	Note 12: Guarantees, Pledged Assets and Collateral, and Other Commitments Guarantees are contracts that contingently require us to make payments to a guaranteed party based on an event or a change in an underlying asset, liability, rate or index. Guarantees are generally in the form of standby letters of credit, securities lending and other indemnifications, written put options, recourse obligations, and other types of arrangements. For complete descriptions of our guarantees, see Note 14 (Guarantees, Pledged Assets and Collateral, and Other Commitments) to Financial Statements in our 2017 Form 10-K. Table 12.1 shows carrying value, maximum exposure to loss on our guarantees and the related non-investment grade amounts. Table 12.1: Guarantees – Carrying Value and Maximum Exposure to Loss Maximum exposure to loss (in millions) Carrying value of obligation (asset) Expires in one year or less Expires after one year through three years Expires after three years through five years Expires after five years Total Non- investment grade March 31, 2018 Standby letters of credit (1) $ 38 14,930 7,984 2,891 554 26,359 8,501 Securities lending and other indemnifications (2) — — — 2 1,028 1,030 2 Written put options (3) (227 ) 15,044 12,739 3,748 891 32,422 20,462 Loans and MHFS sold with recourse (4) 51 169 537 1,172 9,208 11,086 8,289 Factoring guarantees (5) — 814 — — — 814 715 Other guarantees 1 4 — 2 3,828 3,834 4 Total guarantees $ (137 ) 30,961 21,260 7,815 15,509 75,545 37,973 December 31, 2017 Standby letters of credit (1) $ 39 15,357 7,908 3,068 645 26,978 8,773 Securities lending and other indemnifications (2) — — — 2 809 811 2 Written put options (3) (455 ) 14,758 12,706 3,890 1,038 32,392 19,087 Loans and MHFS sold with recourse (4) 51 165 533 934 9,385 11,017 8,155 Factoring guarantees (5) — 747 — — — 747 668 Other guarantees 1 7 — 2 4,175 4,184 7 Total guarantees $ (364 ) 31,034 21,147 7,896 16,052 76,129 36,692 (1) Total maximum exposure to loss includes direct pay letters of credit (DPLCs) of $7.7 billion and $8.1 billion at March 31, 2018 , and December 31, 2017 , respectively. We issue DPLCs to provide credit enhancements for certain bond issuances. Beneficiaries (bond trustees) may draw upon these instruments to make scheduled principal and interest payments, redeem all outstanding bonds because a default event has occurred, or for other reasons as permitted by the agreement. We also originate multipurpose lending commitments under which borrowers have the option to draw on the facility in one of several forms, including as a standby letter of credit. Total maximum exposure to loss includes the portion of these facilities for which we have issued standby letters of credit under the commitments. (2) Includes indemnifications provided to certain third-party clearing agents. Outstanding customer obligations under these arrangements were $100 million and $92 million with related collateral of $929 million and $717 million at March 31, 2018 , and December 31, 2017 , respectively. Estimated maximum exposure to loss was $1.0 billion at March 31, 2018 and $809 million at December 31, 2017 . (3) Written put options, which are in the form of derivatives, are also included in the derivative disclosures in Note 14 (Derivatives). Carrying value net asset position is a result of certain deferred premium option trades. (4) Represent recourse provided, predominantly to the GSEs, on loans sold under various programs and arrangements. Under these arrangements, we repurchased $1 million of loans associated with these agreements in the first quarter 2018 , and $1 million in the same period of 2017 . (5) Consists of guarantees made under certain factoring arrangements to purchase trade receivables from third parties, generally upon their request, if receivable debtors default on their payment obligations. “Maximum exposure to loss” and “Non-investment grade” are required disclosures under GAAP. Non-investment grade represents those guarantees on which we have a higher risk of being required to perform under the terms of the guarantee. If the underlying assets under the guarantee are non-investment grade (that is, an external rating that is below investment grade or an internal credit default grade that is equivalent to a below investment grade external rating), we consider the risk of performance to be high. Internal credit default grades are determined based upon the same credit policies that we use to evaluate the risk of payment or performance when making loans and other extensions of credit. Credit quality indicators we usually consider in evaluating risk of payments or performance are described in Note 6 (Loans and Allowance for Credit Losses). Maximum exposure to loss represents the estimated loss that would be incurred under an assumed hypothetical circumstance, despite what we believe is a remote possibility, where the value of our interests and any associated collateral declines to zero. Maximum exposure to loss estimates in Table 12.1 do not reflect economic hedges or collateral we could use to offset or recover losses we may incur under our guarantee agreements. Accordingly, this required disclosure is not an indication of expected loss. We believe the carrying value, which is either fair value for derivative-related products or the allowance for lending-related commitments, is more representative of our exposure to loss than maximum exposure to loss. Pledged Assets As part of our liquidity management strategy, we pledge various assets to secure trust and public deposits, borrowings and letters of credit from the FHLB and FRB, securities sold under agreements to repurchase (repurchase agreements), securities lending arrangements, and for other purposes as required or permitted by law or insurance statutory requirements. The types of collateral we pledge include securities issued by federal agencies, GSEs, domestic and foreign companies and various commercial and consumer loans. Table 12.2 provides the total carrying amount of pledged assets by asset type and pledged off-balance sheet securities for securities financings. The table excludes pledged consolidated VIE assets of $13.4 billion and $13.6 billion at March 31, 2018 , and December 31, 2017 , respectively, which can only be used to settle the liabilities of those entities. The table also excludes $656 million and $675 million in assets pledged in transactions with VIE's accounted for as secured borrowings at March 31, 2018 , and December 31, 2017 , respectively. See Note 9 (Securitizations and Variable Interest Entities) for additional information on consolidated VIE assets and secured borrowings. Table 12.2: Pledged Assets (in millions) Mar 31, Dec 31, Held for trading: Debt securities $ 83,742 96,993 Equity securities 11,662 12,161 Total pledged assets held for trading (1) 95,404 109,154 Not held for trading: Debt securities and other (2) 66,739 73,592 Mortgages held for sale and loans (3) 450,605 469,554 Total pledged assets not held for trading 517,344 543,146 Total pledged assets $ 612,748 652,300 (1) Consists of pledged assets held for trading of $43.3 billion and $41.9 billion at March 31, 2018 , and December 31, 2017 , respectively and off-balance sheet securities of $52.1 billion and $67.3 billion as of the same dates, respectively, that are pledged as collateral for repurchase agreements and other securities financings. Total pledged assets held for trading includes $95.3 billion and $109.0 billion at March 31, 2018 , and December 31, 2017 , respectively that permit the secured parties to sell or repledge the collateral. (2) Includes carrying value of $4.7 billion and $5.0 billion (fair value of $4.5 billion and $ 5.0 billion ) in collateral for repurchase agreements at March 31, 2018 , and December 31, 2017 , respectively, which are pledged under agreements that do not permit the secured parties to sell or repledge the collateral. Also includes $7 million and $64 million in collateral pledged under repurchase agreements at March 31, 2018 , and December 31, 2017 , respectively, that permit the secured parties to sell or repledge the collateral. Substantially all other pledged securities are pursuant to agreements that do not permit the secured party to sell or repledge the collateral. (3) Includes mortgages held for sale of $1.0 billion and $2.6 billion at March 31, 2018 , and December 31, 2017 , respectively. Substantially all of the total mortgages held for sale and loans are pledged under agreements that do not permit the secured parties to sell or repledge the collateral. Amounts exclude $1.2 billion and $2.2 billion at March 31, 2018 , and December 31, 2017 , respectively, of pledged loans recorded on our balance sheet representing certain delinquent loans that are eligible for repurchase from GNMA loan securitizations. Securities Financing Activities We enter into resale and repurchase agreements and securities borrowing and lending agreements (collectively, “securities financing activities”) typically to finance trading positions (including securities and derivatives), acquire securities to cover short trading positions, accommodate customers’ financing needs, and settle other securities obligations. These activities are conducted through our broker-dealer subsidiaries and to a lesser extent through other bank entities. Most of our securities financing activities involve high quality, liquid securities such as U.S. Treasury securities and government agency securities, and to a lesser extent, less liquid securities, including equity securities, corporate bonds and asset-backed securities. We account for these transactions as collateralized financings in which we typically receive or pledge securities as collateral. We believe these financing transactions generally do not have material credit risk given the collateral provided and the related monitoring processes. OFFSETTING OF RESALE AND REPURCHASE AGREEMENTS AND SECURITIES BORROWING AND LENDING AGREEMENTS Table 12.3 presents resale and repurchase agreements subject to master repurchase agreements (MRA) and securities borrowing and lending agreements subject to master securities lending agreements (MSLA). We account for transactions subject to these agreements as collateralized financings, and those with a single counterparty are presented net on our balance sheet, provided certain criteria are met that permit balance sheet netting. Most transactions subject to these agreements do not meet those criteria and thus are not eligible for balance sheet netting. Collateral we pledged consists of non-cash instruments, such as securities or loans, and is not netted on the balance sheet against the related liability. Collateral we received includes securities or loans and is not recognized on our balance sheet. Collateral pledged or received may be increased or decreased over time to maintain certain contractual thresholds as the assets underlying each arrangement fluctuate in value. Generally, these agreements require collateral to exceed the asset or liability recognized on the balance sheet. The following table includes the amount of collateral pledged or received related to exposures subject to enforceable MRAs or MSLAs. While these agreements are typically over-collateralized, U.S. GAAP requires disclosure in this table to limit the reported amount of such collateral to the amount of the related recognized asset or liability for each counterparty. In addition to the amounts included in Table 12.3 , we also have balance sheet netting related to derivatives that is disclosed in Note 14 (Derivatives). Table 12.3: Offsetting – Resale and Repurchase Agreements (in millions) Mar 31, Dec 31, Assets: Resale and securities borrowing agreements Gross amounts recognized $ 108,479 121,135 Gross amounts offset in consolidated balance sheet (1) (16,574 ) (23,188 ) Net amounts in consolidated balance sheet (2) 91,905 97,947 Collateral not recognized in consolidated balance sheet (3) (91,396 ) (96,829 ) Net amount (4) $ 509 1,118 Liabilities: Repurchase and securities lending agreements Gross amounts recognized (5) $ 96,911 111,488 Gross amounts offset in consolidated balance sheet (1) (16,574 ) (23,188 ) Net amounts in consolidated balance sheet (6) 80,337 88,300 Collateral pledged but not netted in consolidated balance sheet (7) (80,193 ) (87,918 ) Net amount (8) $ 144 382 (1) Represents recognized amount of resale and repurchase agreements with counterparties subject to enforceable MRAs that have been offset in the consolidated balance sheet. (2) At March 31, 2018 , and December 31, 2017 , includes $73.5 billion and $78.9 billion , respectively, classified on our consolidated balance sheet in federal funds sold and securities purchased under resale agreements. Balance also includes securities purchased under long-term resale agreements (generally one year or more) classified in loans, which totaled $18.4 billion and $19.0 billion , at March 31, 2018 , and December 31, 2017 , respectively. (3) Represents the fair value of collateral we have received under enforceable MRAs or MSLAs, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. At March 31, 2018 , and December 31, 2017 , we have received total collateral with a fair value of $118.2 billion and $130.8 billion , respectively, all of which, we have the right to sell or repledge. These amounts include securities we have sold or repledged to others with a fair value of $52.7 billion at March 31, 2018 , and $66.3 billion at December 31, 2017 . (4) Represents the amount of our exposure that is not collateralized and/or is not subject to an enforceable MRA or MSLA. (5) For additional information on underlying collateral and contractual maturities, see the “Repurchase and Securities Lending Agreements” section in this Note. (6) Amount is classified in short-term borrowings on our consolidated balance sheet. (7) Represents the fair value of collateral we have pledged, related to enforceable MRAs or MSLAs, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty. At March 31, 2018 , and December 31, 2017 , we have pledged total collateral with a fair value of $99.2 billion and $113.6 billion , respectively, of which, the counterparty does not have the right to sell or repledge $4.7 billion as of March 31, 2018 and $5.2 billion as of December 31, 2017 . (8) Represents the amount of our obligation that is not covered by pledged collateral and/or is not subject to an enforceable MRA or MSLA. REPURCHASE AND SECURITIES LENDING AGREEMENTS Securities sold under repurchase agreements and securities lending arrangements are effectively short-term collateralized borrowings. In these transactions, we receive cash in exchange for transferring securities as collateral and recognize an obligation to reacquire the securities for cash at the transaction's maturity. These types of transactions create risks, including (1) the counterparty may fail to return the securities at maturity, (2) the fair value of the securities transferred may decline below the amount of our obligation to reacquire the securities, and therefore create an obligation for us to pledge additional amounts, and (3) the counterparty may accelerate the maturity on demand, requiring us to reacquire the security prior to contractual maturity. We attempt to mitigate these risks by the fact that most of our securities financing activities involve highly liquid securities, we underwrite and monitor the financial strength of our counterparties, we monitor the fair value of collateral pledged relative to contractually required repurchase amounts, and we monitor that our collateral is properly returned through the clearing and settlement process in advance of our cash repayment. Table 12.4 provides the underlying collateral types of our gross obligations under repurchase and securities lending agreements. Table 12.4: Underlying Collateral Types of Gross Obligations (in millions) Mar 31, Dec 31, Repurchase agreements: Securities of U.S. Treasury and federal agencies $ 42,646 51,144 Securities of U.S. States and political subdivisions 29 92 Federal agency mortgage-backed securities 33,138 35,386 Non-agency mortgage-backed securities 1,194 1,324 Corporate debt securities 6,092 7,152 Asset-backed securities 2,121 2,034 Equity securities 826 838 Other 66 1,783 Total repurchases 86,112 99,753 Securities lending: Securities of U.S. Treasury and federal agencies 102 186 Federal agency mortgage-backed securities 1 — Corporate debt securities 471 619 Equity securities (1) 10,225 10,930 Total securities lending 10,799 11,735 Total repurchases and securities lending $ 96,911 111,488 (1) Equity securities are generally exchange traded and either re-hypothecated under margin lending agreements or obtained through contemporaneous securities borrowing transactions with other counterparties. Table 12.5 provides the contractual maturities of our gross obligations under repurchase and securities lending agreements. Table 12.5: Contractual Maturities of Gross Obligations (in millions) Overnight/continuous Up to 30 days 30-90 days >90 days Total gross obligation March 31, 2018 Repurchase agreements $ 72,474 5,142 3,401 5,095 86,112 Securities lending 10,178 — 621 — 10,799 Total repurchases and securities lending (1) $ 82,652 5,142 4,022 5,095 96,911 December 31, 2017 Repurchase agreements $ 83,780 7,922 3,286 4,765 99,753 Securities lending 9,634 584 1,363 154 11,735 Total repurchases and securities lending (1) $ 93,414 8,506 4,649 4,919 111,488 (1) Securities lending is executed under agreements that allow either party to terminate the transaction without notice, while repurchase agreements have a term structure to them that technically matures at a point in time. The overnight/continuous repurchase agreements require election of both parties to roll the trade rather than the election to terminate the arrangement as in securities lending. OTHER COMMITMENTS To meet the financing needs of our customers, we may enter into commitments to purchase debt and equity securities to provide capital for their funding, liquidity or other future needs. As of March 31, 2018 , and December 31, 2017 , we had commitments to purchase debt securities of $375 million and $194 million , and commitments to purchase equity securities of $2.5 billion and $2.2 billion , respectively. As part of maintaining our memberships in certain clearing organizations, we are required to stand ready to provide liquidity meant to sustain market clearing activity in the event unforeseen events occur or are deemed likely to occur. This includes commitments we have entered into to purchase securities under resale agreements from a central clearing organization that, at its option, require us to provide funding under such agreements. We do not have any outstanding amounts funded, and the amount of our unfunded contractual commitment was $6.3 billion and $2.8 billion as of March 31, 2018 , and December 31, 2017 , respectively. The Parent will fully and unconditionally guarantee securities that its 100% owned finance subsidiary, Wells Fargo Finance LLC, may issue.

Legal Actions

Legal Actions	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Legal Actions	Note 13: Legal Actions Wells Fargo and certain of our subsidiaries are involved in a number of judicial, regulatory, arbitration, and other proceedings concerning matters arising from the conduct of our business activities, and many of those proceedings expose Wells Fargo to potential financial loss. These proceedings include actions brought against Wells Fargo and/or our subsidiaries with respect to corporate-related matters and transactions in which Wells Fargo and/or our subsidiaries were involved. In addition, Wells Fargo and our subsidiaries may be requested to provide information or otherwise cooperate with government authorities in the conduct of investigations of other persons or industry groups. Although there can be no assurance as to the ultimate outcome, Wells Fargo and/or our subsidiaries have generally denied, or believe we have a meritorious defense and will deny, liability in all significant legal actions pending against us, including the matters described below, and we intend to defend vigorously each case, other than matters we describe as having settled. We establish accruals for legal actions when potential losses associated with the actions become probable and the costs can be reasonably estimated. For such accruals, we record the amount we consider to be the best estimate within a range of potential losses that are both probable and estimable; however, if we cannot determine a best estimate, then we record the low end of the range of those potential losses. The actual costs of resolving legal actions may be substantially higher or lower than the amounts accrued for those actions. ATM ACCESS FEE LITIGATION In October 2011, plaintiffs filed a putative class action, Mackmin, et al. v. Visa, Inc. et al. , against Wells Fargo & Company, Wells Fargo Bank, N.A., Visa, MasterCard, and several other banks in the United States District Court for the District of Columbia. Plaintiffs allege that the Visa and MasterCard requirement that if an ATM operator charges an access fee on Visa and MasterCard transactions, then that fee cannot be greater than the access fee charged for transactions on other networks violates antitrust rules. Plaintiffs seek treble damages, restitution, injunctive relief, and attorneys’ fees where available under federal and state law. Two other antitrust cases which make similar allegations were filed in the same court, but these cases did not name Wells Fargo as a defendant. On February 13, 2013, the district court granted defendants’ motions to dismiss the three actions. Plaintiffs appealed the dismissals and, on August 4, 2015, the United States Court of Appeals for the District of Columbia Circuit vacated the district court’s decisions and remanded the three cases to the district court for further proceedings. On June 28, 2016, the United States Supreme Court granted defendants’ petitions for writ of certiorari to review the decisions of the United States Court of Appeals for the District of Columbia. On November 17, 2016, the United States Supreme Court dismissed the petitions as improvidently granted, and the three cases returned to the district court for further proceedings. AUTOMOBILE LENDING MATTERS On April 20, 2018, the Company entered into consent orders with the Office of the Comptroller of the Currency (OCC) and the Consumer Financial Protection Bureau (CFPB) to resolve, among other things, investigations by the agencies into the Company's compliance risk management program and its past practices involving certain automobile collateral protection insurance (CPI) policies and, as discussed below, certain mortgage interest rate lock extensions. The consent orders require remediation to customers and the payment of a total of $1 billion in civil money penalties to the agencies. In July 2017, the Company announced a plan to remediate customers who may have been financially harmed due to issues related to automobile CPI policies purchased through a third-party vendor on their behalf. Multiple putative class action cases alleging, among other things, unfair and deceptive practices relating to these CPI policies, have been filed against the Company and consolidated into one multi-district litigation in the United States District Court for the Central District of California. A putative class of shareholders also filed a securities fraud class action against the Company and its executive officers alleging material misstatements and omissions of CPI-related information in the Company's public disclosures. Former team members have also alleged retaliation for raising concerns regarding automobile lending practices. In addition, the Company has identified certain issues related to the unused portion of guaranteed automobile protection (GAP) waiver or insurance agreements between the dealer and, by assignment, the lender, which may result in refunds to customers in certain states. Allegations related to both the CPI and GAP programs are among the subjects of two shareholder derivative lawsuits, which were consolidated into one lawsuit in California state court. These and other issues related to the origination, servicing and/or collection of consumer automobile loans, including related insurance products, have also subjected the Company to formal or informal inquiries, investigations or examinations from federal and state government agencies. As the Company continues to centralize operations in its automobile lending business and tighten controls and oversight of third party risk management, the Company anticipates it may continue to identify and remediate issues related to historical practices concerning the origination, servicing and/or collection of consumer automobile loans. CONSUMER DEPOSIT ACCOUNT RELATED REGULATORY INVESTIGATION The CFPB is conducting an investigation into whether customers were unduly harmed by the Company’s procedures regarding the freezing (and, in many cases, closing) of consumer deposit accounts after the Company detected suspected fraudulent activity (by third-parties or account holders) that affected those accounts. A former team member has brought a state court action alleging retaliation for raising concerns about these procedures. INADVERTENT CLIENT INFORMATION DISCLOSURE In July 2017, the Company inadvertently provided certain client information in response to a third-party subpoena issued in a civil litigation. The Company obtained permanent injunctions in New Jersey and New York state courts requiring the electronic data that contained the client information and all copies to be delivered to the New Jersey state court and the Company for safekeeping. The court has now returned the data to counsel for the Company. The Company has made voluntary self-disclosures to various state and federal regulatory agencies. Notifications have been sent to clients whose personal identifying data was contained in the inadvertent production. INTERCHANGE LITIGATION Plaintiffs representing a putative class of merchants have filed putative class actions, and individual merchants have filed individual actions, against Wells Fargo Bank, N.A., Wells Fargo & Company, Wachovia Bank, N.A. and Wachovia Corporation regarding the interchange fees associated with Visa and MasterCard payment card transactions. Visa, MasterCard and several other banks and bank holding companies are also named as defendants in these actions. These actions have been consolidated in the United States District Court for the Eastern District of New York. The amended and consolidated complaint asserts claims against defendants based on alleged violations of federal and state antitrust laws and seeks damages, as well as injunctive relief. Plaintiff merchants allege that Visa, MasterCard and payment card issuing banks unlawfully colluded to set interchange rates. Plaintiffs also allege that enforcement of certain Visa and MasterCard rules and alleged tying and bundling of services offered to merchants are anticompetitive. Wells Fargo and Wachovia, along with other defendants and entities, are parties to Loss and Judgment Sharing Agreements, which provide that they, along with other entities, will share, based on a formula, in any losses from the Interchange Litigation. On July 13, 2012, Visa, MasterCard and the financial institution defendants, including Wells Fargo, signed a memorandum of understanding with plaintiff merchants to resolve the consolidated class action and reached a separate settlement in principle of the consolidated individual actions. The settlement payments to be made by all defendants in the consolidated class and individual actions totaled approximately $6.6 billion before reductions applicable to certain merchants opting out of the settlement. The class settlement also provided for the distribution to class merchants of 10 basis points of default interchange across all credit rate categories for a period of eight consecutive months. The district court granted final approval of the settlement, which was appealed to the United States Court of Appeals for the Second Circuit by settlement objector merchants. Other merchants opted out of the settlement and are pursuing several individual actions. On June 30, 2016, the Second Circuit vacated the settlement agreement and reversed and remanded the consolidated action to the United States District Court for the Eastern District of New York for further proceedings. On November 23, 2016, prior class counsel filed a petition to the United States Supreme Court, seeking review of the reversal of the settlement by the Second Circuit, and the Supreme Court denied the petition on March 27, 2017. On November 30, 2016, the district court appointed lead class counsel for a damages class and an equitable relief class. Several of the opt-out litigations were settled during the pendency of the Second Circuit appeal while others remain pending. Discovery is proceeding in the opt-out litigations and the remanded class cases. MORTGAGE BANKRUPTCY LOAN MODIFICATION LITIGATION Plaintiffs, representing a putative class of mortgage borrowers who were debtors in Chapter 13 bankruptcy cases, filed a putative class action, Cotton, et al. v. Wells Fargo, et al. , against Wells Fargo & Company and Wells Fargo Bank, N.A. in the United States Bankruptcy Court for the Western District of North Carolina on June 7, 2017. Plaintiffs allege that Wells Fargo improperly and unilaterally modified the mortgages of borrowers who were debtors in Chapter 13 bankruptcy cases. Plaintiffs allege that Wells Fargo implemented these modifications by improperly filing mortgage payment change notices in Chapter 13 bankruptcy cases, in violation of bankruptcy rules and process. The amended complaint asserts claims based on, among other things, alleged fraud, violations of bankruptcy rules and laws, and unfair and deceptive trade practices. The amended complaint seeks monetary damages, attorneys’ fees, and declaratory and injunctive relief. MORTGAGE INTEREST RATE LOCK RELATED REGULATORY INVESTIGATION On April 20, 2018, the Company entered into consent orders with the OCC and CFPB to resolve, among other things, investigations by the agencies into the Company's compliance risk management program and its past practices involving certain automobile CPI policies and certain mortgage interest rate lock extensions. The consent orders require remediation to customers and the payment of a total of $1 billion in civil money penalties to the agencies. On October 4, 2017, the Company announced plans to reach out to all home lending customers who paid fees for mortgage rate lock extensions requested from September 16, 2013, through February 28, 2017, and to provide refunds, with interest, to customers who believe they should not have paid those fees. The Company is named in a putative class action, filed in the United States District Court for the Northern District of California, alleging violations of federal and state consumer fraud statutes relating to mortgage rate lock extension fees. In addition, former team members have asserted claims, including in pending litigation, that they were terminated for raising concerns regarding mortgage interest rate lock extension practices. Allegations related to mortgage interest rate lock extension fees are also among the subjects of two shareholder derivative lawsuits filed in California state court. This matter has also subjected the Company to formal or informal inquiries, investigations or examinations from other federal and state government agencies. MORTGAGE RELATED REGULATORY INVESTIGATIONS Federal and state government agencies, including the United States Department of Justice (the “Department of Justice”), continue investigations or examinations of certain mortgage related activities of Wells Fargo and predecessor institutions. Wells Fargo, for itself and for predecessor institutions, has responded, and continues to respond, to requests from these agencies seeking information regarding the origination, underwriting and securitization of residential mortgages, including sub-prime mortgages. These agencies have advanced theories of purported liability with respect to certain of these activities. The Department of Justice and Wells Fargo continue to discuss the matter, including potential settlement of the Department of Justice's concerns; however, litigation with these agencies, including with the Department of Justice, remains a possibility. Other financial institutions have entered into similar settlements with these agencies, the nature of which related to the specific activities of those financial institutions, including the imposition of significant financial penalties and remedial actions. OFAC RELATED INVESTIGATION The Company has self-identified an issue whereby certain foreign banks utilized a Wells Fargo software-based solution to conduct import/export trade-related financing transactions with countries and entities prohibited by the Office of Foreign Assets Control (“OFAC”) of the United States Department of the Treasury. We do not believe any funds related to these transactions flowed through accounts at Wells Fargo as a result of the aforementioned conduct. The Company has made voluntary self-disclosures to OFAC and is cooperating with an inquiry from the Department of Justice. ORDER OF POSTING LITIGATION Plaintiffs filed a series of putative class actions against Wachovia Bank, N.A. and Wells Fargo Bank, N.A., as well as many other banks, challenging the “high to low” order in which the banks post debit card transactions to consumer deposit accounts. Most of these actions were consolidated in multi-district litigation proceedings (the “MDL proceedings”) in the United States District Court for the Southern District of Florida. The court in the MDL proceedings has certified a class of putative plaintiffs, and Wells Fargo moved to compel arbitration of the claims of unnamed class members. The court denied the motions to compel arbitration on October 17, 2016. Wells Fargo has appealed this decision to the United States Court of Appeals for the Eleventh Circuit. RMBS TRUSTEE LITIGATION In November 2014, a group of institutional investors (the “Institutional Investor Plaintiffs”), including funds affiliated with BlackRock, Inc., filed a putative class action in the United States District Court for the Southern District of New York against Wells Fargo Bank, N.A., alleging claims against the Company in its capacity as trustee for a number of residential mortgage-backed securities (RMBS) trusts (the “Federal Court Complaint”). Similar complaints have been filed against other trustees in various courts, including in the Southern District of New York, in New York state court, and in other states, by RMBS investors. The Federal Court Complaint alleges that Wells Fargo Bank, N.A., as trustee, caused losses to investors and asserts causes of action based upon, among other things, the trustee's alleged failure to notify and enforce repurchase obligations of mortgage loan sellers for purported breaches of representations and warranties, notify investors of alleged events of default, and abide by appropriate standards of care following alleged events of default. Plaintiffs seek money damages in an unspecified amount, reimbursement of expenses, and equitable relief. In December 2014 and December 2015, certain other investors filed four complaints alleging similar claims against Wells Fargo Bank, N.A. in the Southern District of New York (the “Related Federal Cases”), and the various cases pending against Wells Fargo are proceeding before the same judge. On January 19, 2016, the Southern District of New York entered an order in connection with the Federal Court Complaint dismissing claims related to certain of the trusts at issue (the “Dismissed Trusts”). The Company's motion to dismiss the Federal Court Complaint and the complaints for the Related Federal Cases was granted in part and denied in part in March 2017. In May 2017, the Company filed third-party complaints against certain investment advisors affiliated with the Institutional Investor Plaintiffs seeking contribution with respect to claims alleged in the Federal Court Complaint. The investment advisors have moved to dismiss those complaints. On April 17, 2018, the court denied class certification in the Related Federal Case brought by Royal Park Investments SA/NV (Royal Park). A complaint raising similar allegations to the Federal Court Complaint was filed in May 2016 in New York state court by a different plaintiff investor. In addition, the Institutional Investor Plaintiffs subsequently filed a complaint relating to the Dismissed Trusts and certain additional trusts in California state court (the “California Action”). The California Action was subsequently dismissed in September 2016. In December 2016, the Institutional Investor Plaintiffs filed a new putative class action complaint in New York state court in respect of 261 RMBS trusts, including the Dismissed Trusts, for which Wells Fargo Bank, N.A. serves or served as trustee (the “State Court Action”). The Company has moved to dismiss the State Court Action. In July 2017, certain of the plaintiffs from the State Court Action filed a civil complaint relating to Wells Fargo Bank, N.A.'s setting aside reserves for legal fees and expenses in connection with the liquidation of eleven RMBS trusts at issue in the State Court Action. The complaint seeks, among other relief, declarations that Wells Fargo Bank, N.A. is not entitled to indemnification, the advancement of funds or the taking of reserves from trust funds for legal fees and expenses it incurs in defending the claims in the State Court Action. In November 2017, the Company's motion to dismiss the complaint was granted. Plaintiffs filed a notice of appeal in January 2018. In September 2017, Royal Park filed a similar complaint in the Southern District of New York seeking declaratory and injunctive relief and money damages on an individual and class action basis. SALES PRACTICES MATTERS Federal, state and local government agencies, including the Department of Justice, the United States Securities and Exchange Commission and the United States Department of Labor, and state attorneys general and prosecutors’ offices, as well as Congressional committees, have undertaken formal or informal inquiries, investigations or examinations arising out of certain sales practices of the Company that were the subject of settlements with the Consumer Financial Protection Bureau, the Office of the Comptroller of the Currency and the Office of the Los Angeles City Attorney announced by the Company on September 8, 2016. These matters are at varying stages. The Company has responded, and continues to respond, to requests from a number of the foregoing and has discussed the resolution of some of the matters. In addition, a number of lawsuits have also been filed by non-governmental parties seeking damages or other remedies related to these sales practices. First, various class plaintiffs purporting to represent consumers who allege that they received products or services without their authorization or consent have brought separate putative class actions against the Company in the United States District Court for the Northern District of California and various other jurisdictions. In April 2017, the Company entered into a settlement agreement in the first-filed action, Jabbari v. Wells Fargo Bank, N.A ., to resolve claims regarding certain products or services provided without authorization or consent for the time period May 1, 2002 to April 20, 2017. Pursuant to the settlement, the Company will pay $142 million for remediation, attorneys’ fees, and settlement fund claims administration. In the unlikely event that the $142 million settlement total is not enough to provide remediation, pay attorneys' fees, pay settlement fund claims administration costs, and have at least $25 million left over to distribute to all class members, the Company will contribute additional funds to the settlement. In addition, in the unlikely event that the number of unauthorized accounts identified by settlement class members in the claims process and not disputed by the claims administrator exceeds plaintiffs’ 3.5 million account estimate, the Company will proportionately increase the $25 million reserve so that the ratio of reserve to unauthorized accounts is no less than what was implied by plaintiffs’ estimate at the time of the district court’s preliminary approval of the settlement in July 2017. A final approval hearing has been scheduled for May 30, 2018. Second, Wells Fargo shareholders are pursuing a consolidated securities fraud class action in the United States District Court for the Northern District of California alleging certain misstatements and omissions in the Company’s disclosures related to sales practices matters. The Company has reached an agreement in principle to resolve this matter pursuant to which the Company will pay $480 million . The amount was fully accrued as of March 31, 2018. The agreement in principle is subject to confirmatory discovery by the plaintiff and final approval by the court. Third, Wells Fargo shareholders have brought numerous shareholder derivative lawsuits asserting breach of fiduciary duty claims, among others, against current and former directors and officers for their alleged failure to detect and prevent sales practices issues, which were consolidated into two separate actions in the United States District Court for the Northern District of California and California state court. Additional lawsuits asserting similar claims are pending in Delaware state court. Fourth, multiple employment litigation matters have been brought against Wells Fargo, including an Employee Retirement Income Security Act (ERISA) class action in the United States District Court for the District of Minnesota on behalf of 401(k) plan participants; a class action pending in the United States District Court for the Northern District of California on behalf of team members who allege that they protested sales practice misconduct and/or were terminated for not meeting sales goals; various wage and hour class actions brought in federal and state court in California, New Jersey, Florida, and Pennsylvania on behalf of non-exempt branch based team members alleging that sales pressure resulted in uncompensated overtime; and multiple single plaintiff Sarbanes-Oxley Act complaints and state law whistleblower actions filed with the United States Department of Labor or in various state courts alleging adverse employment actions for raising sales practice misconduct issues. SEMINOLE TRIBE TRUSTEE LITIGATION The Seminole Tribe of Florida filed a complaint in Florida state court alleging that Wells Fargo, as trustee, charged excess fees in connection with the administration of a minor’s trust and failed to invest the assets of the trust prudently. The complaint was later amended to include three individual current and former beneficiaries as plaintiffs and to remove the Tribe as a party to the case. In December 2016, the Company filed a motion to dismiss the amended complaint on the grounds that the Tribe is a necessary party and that the individual beneficiaries lack standing to bring claims. OUTLOOK As described above, the Company establishes accruals for legal actions when potential losses associated with the actions become probable and the costs can be reasonably estimated. The high end of the range of reasonably possible potential losses in excess of the Company’s accrual for probable and estimable losses was approximately $2.6 billion as of March 31, 2018 . The outcomes of legal actions are unpredictable and subject to significant uncertainties, and it is inherently difficult to determine whether any loss is probable or even possible. It is also inherently difficult to estimate the amount of any loss and there may be matters for which a loss is probable or reasonably possible but not currently estimable. Accordingly, actual losses may be in excess of the established accrual or the range of reasonably possible loss. Wells Fargo is unable to determine whether the ultimate resolution of either the mortgage related regulatory investigations or the sales practices matters will have a material adverse effect on its consolidated financial condition. Based on information currently available, advice of counsel, available insurance coverage and established reserves, Wells Fargo believes that the eventual outcome of other actions against Wells Fargo and/or its subsidiaries will not, individually or in the aggregate, have a material adverse effect on Wells Fargo’s consolidated financial condition. However, it is possible that the ultimate resolution of a matter, if unfavorable, may be material to Wells Fargo’s results of operations for any particular period.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Note 14: Derivatives We use derivatives to manage exposure to market risk, including interest rate risk, credit risk and foreign currency risk, and to assist customers with their risk management objectives. We designate certain derivatives as hedging instruments in a qualifying hedge accounting relationship (fair value or cash flow hedge). Our remaining derivatives consist of economic hedges that do not qualify for hedge accounting and derivatives held for customer accommodation trading, or other purposes. For more information on our derivative activities, see Note 16 (Derivatives) to Financial Statements in our 2017 Form 10-K. Table 14.1 presents the total notional or contractual amounts and fair values for our derivatives. Derivative transactions can be measured in terms of the notional amount, but this amount is not recorded on the balance sheet and is not, when viewed in isolation, a meaningful measure of the risk profile of the instruments. The notional amount is generally not exchanged but is used only as the basis on which interest and other payments are determined. Table 14.1: Notional or Contractual Amounts and Fair Values of Derivatives March 31, 2018 December 31, 2017 Notional or contractual amount Fair value Notional or contractual amount Fair value (in millions) Derivative assets Derivative liabilities Derivative Derivative Derivatives designated as hedging instruments Interest rate contracts (1) $ 165,802 2,387 724 209,677 2,492 1,092 Foreign exchange contracts (1) 31,720 1,769 742 34,135 1,482 1,137 Total derivatives designated as qualifying hedging instruments 4,156 1,466 3,974 2,229 Derivatives not designated as hedging instruments Economic hedges: Interest rate contracts (2) 197,432 287 416 220,558 159 201 Equity contracts 12,978 1,058 69 12,315 716 138 Foreign exchange contracts 15,373 84 205 15,976 78 309 Credit contracts – protection purchased 211 42 — 111 37 — Subtotal 1,471 690 990 648 Customer accommodation trading and other derivatives: Interest rate contracts 7,560,715 14,173 14,855 6,434,673 14,979 14,179 Commodity contracts 70,455 2,575 1,457 62,530 2,354 1,335 Equity contracts 231,036 6,765 7,708 213,750 6,291 8,363 Foreign exchange contracts 349,850 6,885 6,140 362,896 7,413 7,122 Credit contracts – protection sold 8,826 118 197 9,021 147 214 Credit contracts – protection purchased 17,559 191 159 17,406 207 208 Subtotal 30,707 30,516 31,391 31,421 Total derivatives not designated as hedging instruments 32,178 31,206 32,381 32,069 Total derivatives before netting 36,334 32,672 36,355 34,298 Netting (3) (24,867 ) (24,789 ) (24,127 ) (25,502 ) Total $ 11,467 7,883 12,228 8,796 (1) Notional amounts presented exclude $0 million and $500 million of interest rate contracts at March 31, 2018 , and December 31, 2017 , respectively, for certain derivatives that are combined for designation as a hedge on a single instrument. The notional amount for foreign exchange contracts at March 31, 2018 , and December 31, 2017 , excludes $12.0 billion and $13.5 billion , respectively, for certain derivatives that are combined for designation as a hedge on a single instrument. (2) Includes economic hedge derivatives used to hedge the risk of changes in the fair value of residential MSRs, MHFS, loans, derivative loan commitments and other interests held. (3) Represents balance sheet netting of derivative asset and liability balances, related cash collateral and portfolio level counterparty valuation adjustments. See Table 14.2 for further information. Table 14.2 provides information on the gross fair values of derivative assets and liabilities, the balance sheet netting adjustments and the resulting net fair value amount recorded on our balance sheet, as well as the non-cash collateral associated with such arrangements. We execute substantially all of our derivative transactions under master netting arrangements and reflect all derivative balances and related cash collateral subject to enforceable master netting arrangements on a net basis within the balance sheet. The “Gross amounts recognized” column in the following table includes $31.8 billion and $29.6 billion of gross derivative assets and liabilities, respectively, at March 31, 2018 , and $30.0 billion and $29.9 billion , respectively, at December 31, 2017 , with counterparties subject to enforceable master netting arrangements that are carried on the balance sheet net of offsetting amounts. The remaining gross derivative assets and liabilities of $4.5 billion and $3.1 billion , respectively, at March 31, 2018 , and $6.4 billion and $4.4 billion , respectively, at December 31, 2017 , include those with counterparties subject to master netting arrangements for which we have not assessed the enforceability because they are with counterparties where we do not currently have positions to offset, those subject to master netting arrangements where we have not been able to confirm the enforceability and those not subject to master netting arrangements. As such, we do not net derivative balances or collateral within the balance sheet for these counterparties. We determine the balance sheet netting adjustments based on the terms specified within each master netting arrangement. We disclose the balance sheet netting amounts within the column titled “Gross amounts offset in consolidated balance sheet.” Balance sheet netting adjustments are determined at the counterparty level for which there may be multiple contract types. For disclosure purposes, we allocate these netting adjustments to the contract type for each counterparty proportionally based upon the “Gross amounts recognized” by counterparty. As a result, the net amounts disclosed by contract type may not represent the actual exposure upon settlement of the contracts. We do not net non-cash collateral that we receive and pledge on the balance sheet. For disclosure purposes, we present the fair value of this non-cash collateral in the column titled “Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)” within the table. We determine and allocate the Disclosure-only netting amounts in the same manner as balance sheet netting amounts. The “Net amounts” column within Table 14.2 represents the aggregate of our net exposure to each counterparty after considering the balance sheet and Disclosure-only netting adjustments. We manage derivative exposure by monitoring the credit risk associated with each counterparty using counterparty specific credit risk limits, using master netting arrangements and obtaining collateral. Derivative contracts executed in over-the-counter markets include bilateral contractual arrangements that are not cleared through a central clearing organization but are typically subject to master netting arrangements. The percentage of our bilateral derivative transactions outstanding at period end in such markets, based on gross fair value, is provided within the following table. Other derivative contracts executed in over-the-counter or exchange-traded markets are settled through a central clearing organization and are excluded from this percentage. In addition to the netting amounts included in the table, we also have balance sheet netting related to resale and repurchase agreements that are disclosed within Note 12 (Guarantees, Pledged Assets and Collateral, and Other Commitments). Table 14.2: Gross Fair Values of Derivative Assets and Liabilities (in millions) Gross amounts recognized Gross amounts offset in consolidated balance sheet (1) Net amounts in consolidated balance sheet Gross amounts not offset in consolidated balance sheet (Disclosure-only netting) (2) Net amounts Percent exchanged in over-the-counter market (3) March 31, 2018 Derivative assets Interest rate contracts $ 16,847 (11,407 ) 5,440 (91 ) 5,349 98 % Commodity contracts 2,575 (1,032 ) 1,543 (3 ) 1,540 87 Equity contracts 7,823 (5,997 ) 1,826 (559 ) 1,267 77 Foreign exchange contracts 8,738 (6,134 ) 2,604 (226 ) 2,378 100 Credit contracts – protection sold 118 (115 ) 3 — 3 11 Credit contracts – protection purchased 233 (182 ) 51 (1 ) 50 89 Total derivative assets $ 36,334 (24,867 ) 11,467 (880 ) 10,587 Derivative liabilities Interest rate contracts $ 15,995 (12,449 ) 3,546 (755 ) 2,791 97 % Commodity contracts 1,457 (744 ) 713 — 713 69 Equity contracts 7,777 (5,220 ) 2,557 (247 ) 2,310 82 Foreign exchange contracts 7,087 (6,035 ) 1,052 (124 ) 928 100 Credit contracts – protection sold 197 (192 ) 5 (5 ) — 84 Credit contracts – protection purchased 159 (149 ) 10 — 10 9 Total derivative liabilities $ 32,672 (24,789 ) 7,883 (1,131 ) 6,752 December 31, 2017 Derivative assets Interest rate contracts $ 17,630 (11,929 ) 5,701 (145 ) 5,556 99 % Commodity contracts 2,354 (966 ) 1,388 (4 ) 1,384 88 Equity contracts 7,007 (4,233 ) 2,774 (596 ) 2,178 76 Foreign exchange contracts 8,973 (6,656 ) 2,317 (25 ) 2,292 100 Credit contracts – protection sold 147 (145 ) 2 — 2 10 Credit contracts – protection purchased 244 (198 ) 46 (3 ) 43 89 Total derivative assets $ 36,355 (24,127 ) 12,228 (773 ) 11,455 Derivative liabilities Interest rate contracts $ 15,472 (13,226 ) 2,246 (1,078 ) 1,168 99 % Commodity contracts 1,335 (648 ) 687 (1 ) 686 76 Equity contracts 8,501 (4,041 ) 4,460 (400 ) 4,060 85 Foreign exchange contracts 8,568 (7,189 ) 1,379 (204 ) 1,175 100 Credit contracts – protection sold 214 (204 ) 10 (9 ) 1 85 Credit contracts – protection purchased 208 (194 ) 14 — 14 9 Total derivative liabilities $ 34,298 (25,502 ) 8,796 (1,692 ) 7,104 (1) Represents amounts with counterparties subject to enforceable master netting arrangements that have been offset in the consolidated balance sheet, including related cash collateral and portfolio level counterparty valuation adjustments. Counterparty valuation adjustments were $283 million and $245 million related to derivative assets and $132 million and $95 million related to derivative liabilities at March 31, 2018 , and December 31, 2017 , respectively. Cash collateral totaled $3.7 billion and $3.7 billion , netted against derivative assets and liabilities, respectively, at March 31, 2018 , and $2.7 billion and $4.2 billion , respectively, at December 31, 2017 . (2) Represents the fair value of non-cash collateral pledged and received against derivative assets and liabilities with the same counterparty that are subject to enforceable master netting arrangements. U.S. GAAP does not permit netting of such non-cash collateral balances in the consolidated balance sheet but requires disclosure of these amounts. (3) Represents derivatives executed in over-the-counter markets that are not settled through a central clearing organization. Over-the-counter percentages are calculated based on gross amounts recognized as of the respective balance sheet date. The remaining percentage represents derivatives settled through a central clearing organization, which are executed in either over-the-counter or exchange-traded markets. Fair Value and Cash Flow Hedges For fair value hedges, we use interest rate swaps to convert certain of our fixed-rate long-term debt and time certificates of deposit to floating rates to hedge our exposure to interest rate risk. We also enter into cross-currency swaps, cross-currency interest rate swaps and forward contracts to hedge our exposure to foreign currency risk and interest rate risk associated with the issuance of non-U.S. dollar denominated long-term debt. In addition, we use interest rate swaps, cross-currency swaps, cross-currency interest rate swaps and forward contracts to hedge against changes in fair value of certain investments in available-for-sale debt securities due to changes in interest rates, foreign currency rates, or both. We also use interest rate swaps to hedge against changes in fair value for certain mortgages held for sale. For cash flow hedges, we use interest rate swaps to hedge the variability in interest payments received on certain floating-rate commercial loans and paid on certain floating-rate debt due to changes in the contractually specified interest rate. We estimate $309 million pre-tax of deferred net losses related to cash flow hedges in OCI at March 31, 2018 , will be reclassified into net interest income during the next twelve months. Our cash flow hedges matured early in the second quarter 2018 and therefore we are no longer hedging our floating-rate loans or debt liabilities. For more information on our accounting hedges, see Note 1 (Summary of Significant Accounting Policies) and Note 16 (Derivatives) to Financial Statements in our 2017 Form 10-K. Table 14.3 shows the net gains (losses) related to derivatives in fair value and cash flow hedging relationships. Table 14.3: Gains (Losses) Recognized in Consolidated Statement of Income on Fair Value and Cash Flow Hedging Relationships Net interest income Noninterest Income (in millions) Debt securities Loans Mortgages held for sale Deposits Long-term debt Other Total Quarter ended March 31, 2018 Total amounts presented in the consolidated statement of income $ 3,414 10,579 179 (1,090 ) (1,576 ) 602 12,108 Gains (losses) on fair value hedging relationships Interest contracts Amounts related to interest settlements on derivatives (1) (82 ) — (1 ) (5 ) 171 — 83 Recognized on derivatives 950 1 6 (149 ) (2,393 ) — (1,585 ) Recognized on hedged items (968 ) (1 ) (8 ) 141 2,334 — 1,498 Foreign exchange contracts Amounts related to interest settlements on derivatives (1)(2) 5 — — — (80 ) — (75 ) Recognized on derivatives (3) 4 — — — (171 ) 660 493 Recognized on hedged items (3 ) — — — 109 (627 ) (521 ) Net income (expense) recognized on fair value hedges (94 ) — (3 ) (13 ) (30 ) 33 (107 ) Gains (losses) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from cumulative OCI into net income (4) — (60 ) — — — — (60 ) Net income (expense) recognized on cash flow hedges $ — (60 ) — — — — (60 ) (continued on following page) (continued from previous page) Net interest income Noninterest Income (in millions) Debt securities Loans Mortgages held for sale Deposits Long-term debt Other Total Quarter ended March 31, 2017 Total amounts of line items presented in the consolidated statement of income $ 3,173 10,141 182 (536 ) (1,147 ) 374 12,187 Gains (losses) on fair value hedging relationships Interest contracts Amounts related to interest settlements on derivatives (1) (131 ) (1 ) (1 ) 12 415 — 294 Recognized on derivatives 126 1 (2 ) (8 ) (556 ) — (439 ) Recognized on hedged items (141 ) (1 ) — 10 556 — 424 Foreign exchange contracts Amounts related to interest settlements on derivatives (1)(2) 4 — — — (33 ) — (29 ) Recognized on derivatives (3) 6 — — — (47 ) 375 334 Recognized on hedged items (3 ) — — — 83 (340 ) (260 ) Net income (expense) recognized on fair value hedges (139 ) (1 ) (3 ) 14 418 35 324 Gains (losses) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from cumulative OCI into net income (4) — 205 — — (3 ) — 202 Net income (expense) recognized on cash flow hedges $ — 205 — — (3 ) — 202 (1) Includes $7 million and $5 million for first quarter 2018 and 2017, respectively, which represents changes in fair value due to the passage of time associated with the non-zero fair value amount at hedge inception. (2) Includes $0 million , and $(1) million for first quarter 2018 and 2017, respectively, of the time value component recognized as net interest income (expense) on forward derivatives hedging foreign currency debt securities and long-term debt that were excluded from the assessment of hedge effectiveness. (3) For certain fair value hedges of foreign currency risk, changes in fair value of cross-currency swaps attributable to changes in cross-currency basis spreads are excluded from the assessment of hedge effectiveness and recorded in other comprehensive income. See Note 20 (Other Comprehensive Income) for the amounts recognized in other comprehensive income. (4) See Note 20 (Other Comprehensive Income) for details of amounts reclassified to net income. Table 14.4 shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. Table 14.4: Hedged Items in Fair Value Hedging Relationship Hedged Items Currently Designated Hedged Items No Longer Designated (1) (in millions) Carrying Amount of Assets/(Liabilities) (2)(4) Hedge Accounting Basis Adjustment Assets/(Liabilities) (3) Carrying Amount of Assets/(Liabilities) (4) Hedge Accounting Basis Adjustment March 31, 2018 Available-for-sale debt securities (5) $ 31,023 (301 ) 4,916 288 Loans 135 (1 ) — — Mortgages held for sale 822 1 — — Deposits (29,564 ) 298 — — Long-term debt (125,876 ) 265 (805 ) 13 December 31, 2017 Available-for-sale debt securities (5) 32,498 870 5,221 343 Loans 140 (1 ) — — Mortgages held for sale 465 (1 ) — — Deposits (23,679 ) 158 — — Long-term debt (128,950 ) (2,154 ) (1,953 ) 16 (1) Represents hedged items no longer designated in qualifying fair value hedging relationships for which an associated basis adjustment exists at the balance sheet date. (2) Does not include the carrying amount of hedged items where only foreign currency risk is the designated hedged risk. The carrying amount excluded for debt securities is $1.5 billion and $(7.4) billion for long-term debt as of March 31, 2018 and $1.5 billion for debt securities and for long-term debt is $(7.7) billion as of December 31, 2017. (3) The balance includes $1.7 billion and $266 million of debt securities and long-term debt cumulative basis adjustments as of March 31, 2018, respectively, and $2.1 billion and $297 million of debt securities and long-term debt cumulative basis adjustments, respectively as of December 31, 2017, on terminated hedges whereby the hedged items have subsequently been re-designated into existing hedges. (4) Represents the full carrying amount of the hedged asset or liability item as of the balance sheet date, except for circumstances in which only a portion of the asset or liability was designated as the hedged item in which case only the portion designated is presented. (5) Carrying amount represents the amortized cost. Derivatives Not Designated as Hedging Instruments We use economic hedge derivatives to hedge the risk of changes in the fair value of certain residential MHFS, certain loans held for investment, residential MSRs measured at fair value, derivative loan commitments and other interests held. We also use economic hedge derivatives to mitigate the periodic earnings volatility caused by mismatches between the changes in fair value of the hedged item and hedging instrument recognized on our fair value accounting hedges. The resulting gain or loss on these economic hedge derivatives is reflected in mortgage banking noninterest income, net gains (losses) from equity investments and other noninterest income. The derivatives used to hedge MSRs measured at fair value, resulted in net derivative gains (losses) of $(1.2) billion in first quarter 2018 and $(72) million in first quarter 2017 , which are included in mortgage banking noninterest income. The aggregate fair value of these derivatives was a net liability of $13 million at March 31, 2018 , and net asset of $89 million at December 31, 2017 . The change in fair value of these derivatives for each period end is due to changes in the underlying market indices and interest rates as well as the purchase and sale of derivative financial instruments throughout the period as part of our dynamic MSR risk management process. Interest rate lock commitments for mortgage loans that we intend to sell are considered derivatives. The aggregate fair value of derivative loan commitments on the balance sheet was a net positive fair value of $37 million and $17 million at March 31, 2018 , and December 31, 2017 , respectively, and is included in the caption “Interest rate contracts” under “Customer accommodation trading and other derivatives” in Table 14.1 in this Note. For more information on economic hedges and other derivatives, see Note 16 (Derivatives) to Financial Statements in our 2017 Form 10-K. Table 14.5 shows the net gains (losses) recognized by income statement lines, related to derivatives not designated as hedging instruments. Table 14.5: Gains (Losses) on Derivatives Not Designated as Hedging Instruments Noninterest income (in millions) Mortgage banking Net gains (losses) from equity securities Net gains (losses) from trading activities Other Total Quarter ended March 31, 2018 Net gains (losses) recognized on economic hedges derivatives: Interest contracts (1) $ (595 ) — — 9 (586 ) Equity contracts — (58 ) — — (58 ) Foreign exchange contracts — — — (159 ) (159 ) Credit contracts — — — 4 4 Subtotal (2) (595 ) (58 ) — (146 ) (799 ) Net gains (losses) recognized on customer accommodation trading and other derivatives: Interest contracts (3) (259 ) — 385 — 126 Equity contracts — — 459 (195 ) 264 Foreign exchange contracts — — 310 — 310 Credit contracts — — 10 — 10 Commodity contracts — — 39 — 39 Other — — — — — Subtotal (259 ) — 1,203 (195 ) 749 Net gains (losses) recognized related to derivatives not designated as hedging instruments $ (854 ) (58 ) 1,203 (341 ) (50 ) (continued on following page) (continued from previous page) Noninterest income (in millions) Mortgage banking Net gains (losses) from equity securities Net gains (losses) from trading activities Other Total Quarter ended March 31, 2017 Net gains (losses) recognized on economic hedges derivatives: Interest contracts (1) $ (9 ) — — 6 (3 ) Equity contracts — (474 ) — (7 ) (481 ) Foreign exchange contracts — — — (87 ) (87 ) Credit contracts — — — 4 4 Subtotal (2) (9 ) (474 ) — (84 ) (567 ) Net gains (losses) recognized on customer accommodation trading and other derivatives: Interest contracts (3) 193 — 45 — 238 Equity contracts — — (1,109 ) — (1,109 ) Foreign exchange contracts — — 179 — 179 Credit contracts — — (15 ) — (15 ) Commodity contracts — — 60 — 60 Other — — 12 — 12 Subtotal 193 — (828 ) — (635 ) Net gains (losses) recognized related to derivatives not designated as hedging instruments $ 184 (474 ) (828 ) (84 ) (1,202 ) (1) Includes gains (losses) on the derivatives used as economic hedges of MSRs measured at fair value, interest rate lock commitments and mortgages held for sale. (2) Includes hedging gains of $28 million and $2 million for first quarter 2018 and 2017, respectively, which partially offset hedge accounting ineffectiveness. (3) Amounts presented in mortgage banking noninterest income are gains on interest rate lock commitments. Credit Derivatives Credit derivative contracts are arrangements whose value is derived from the transfer of credit risk of a reference asset or entity from one party (the purchaser of credit protection) to another party (the seller of credit protection). We use credit derivatives to assist customers with their risk management objectives. We may also use credit derivatives in structured product transactions or liquidity agreements written to special purpose vehicles. The maximum exposure of sold credit derivatives is managed through posted collateral, purchased credit derivatives and similar products in order to achieve our desired credit risk profile. This credit risk management provides an ability to recover a significant portion of any amounts that would be paid under the sold credit derivatives. We would be required to perform under sold credit derivatives in the event of default by the referenced obligors. Events of default include events such as bankruptcy, capital restructuring or lack of principal and/or interest payment. In certain cases, other triggers may exist, such as the credit downgrade of the referenced obligors or the inability of the special purpose vehicle for which we have provided liquidity to obtain funding. Table 14.6 provides details of sold and purchased credit derivatives. Table 14.6: Sold and Purchased Credit Derivatives Notional amount (in millions) Fair value liability Protection sold (A) Protection sold – non- investment grade Protection purchased with identical underlyings (B) Net protection sold (A) - (B) Other protection purchased Range of maturities March 31, 2018 Credit default swaps on: Corporate bonds $ 34 2,152 531 1,669 483 988 2018 - 2027 Structured products 78 184 179 166 18 124 2022 - 2047 Credit protection on: Default swap index — 2,225 525 395 1,830 3,458 2018 - 2028 Commercial mortgage-backed securities index 75 444 164 421 23 47 2047 - 2058 Asset-backed securities index 10 43 43 43 — 1 2045 - 2046 Other — 3,778 3,674 — 3,778 10,458 2018 - 2031 Total credit derivatives $ 197 8,826 5,116 2,694 6,132 15,076 December 31, 2017 Credit default swaps on: Corporate bonds $ 35 2,007 510 1,575 432 946 2018 - 2027 Structured products 86 267 252 232 35 153 2022 - 2047 Credit protection on: Default swap index — 2,626 540 308 2,318 3,932 2018 - 2027 Commercial mortgage-backed securities index 83 423 — 401 22 87 2047 - 2058 Asset-backed securities index 9 42 — 42 — 1 2045 - 2046 Other 1 3,656 3,306 — 3,656 9,840 2018 - 2031 Total credit derivatives $ 214 9,021 4,608 2,558 6,463 14,959 Protection sold represents the estimated maximum exposure to loss that would be incurred under an assumed hypothetical circumstance, where the value of our interests and any associated collateral declines to zero, without any consideration of recovery or offset from any economic hedges. We believe this hypothetical circumstance to be a remote possibility and accordingly, this required disclosure is not an indication of expected loss. The amounts under non-investment grade represent the notional amounts of those credit derivatives on which we have a higher risk of being required to perform under the terms of the credit derivative and are a function of the underlying assets. We consider the risk of performance to be high if the underlying assets under the credit derivative have an external rating that is below investment grade or an internal credit default grade that is equivalent thereto. We believe the net protection sold, which is representative of the net notional amount of protection sold and purchased with identical underlyings, in combination with other protection purchased, is more representative of our exposure to loss than either non-investment grade or protection sold. Other protection purchased represents additional protection, which may offset the exposure to loss for protection sold, that was not purchased with an identical underlying of the protection sold. Credit-Risk Contingent Features Certain of our derivative contracts contain provisions whereby if the credit rating of our debt were to be downgraded by certain major credit rating agencies, the counterparty could demand additional collateral or require termination or replacement of derivative instruments in a net liability position. The aggregate fair value of all derivative instruments with such credit-risk-related contingent features that are in a net liability position was $7.3 billion at March 31, 2018 , and $8.3 billion at December 31, 2017 , for which we posted $5.9 billion and $7.1 billion , respectively, in collateral in the normal course of business. A credit rating below investment grade is the credit-risk-related contingent feature that if triggered requires the maximum amount of collateral to be posted. If the credit rating of our debt had been downgraded below investment grade, on March 31, 2018 , or December 31, 2017 , we would have been required to post additional collateral of $1.3 billion or $1.2 billion , respectively, or potentially settle the contract in an amount equal to its fair value. Some contracts require that we provide more collateral than the fair value of derivatives that are in a net liability position if a downgrade occurs. Counterparty Credit Risk By using derivatives, we are exposed to counterparty credit risk if counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet. The amounts reported as a derivative asset are derivative contracts in a gain position, and to the extent subject to legally enforceable master netting arrangements, net of derivatives in a loss position with the same counterparty and cash collateral received. We minimize counterparty credit risk through credit approvals, limits, monitoring procedures, executing master netting arrangements and obtaining collateral, where appropriate. To the extent the master netting arrangements and other criteria meet the applicable requirements, including determining the legal enforceability of the arrangement, it is our policy to present derivative balances and related cash collateral amounts net on the balance sheet. We incorporate credit valuation adjustments (CVA) to reflect counterparty credit risk in determining the fair value of our derivatives. Such adjustments, which consider the effects of enforceable master netting agreements and collateral arrangements, reflect market-based views of the credit quality of each counterparty. Our CVA calculation is determined based on observed credit spreads in the credit default swap market and indices indicative of the credit quality of the counterparties to our derivatives.

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	Note 15: Fair Values of Assets and Liabilities We use fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Assets and liabilities recorded at fair value on a recurring basis are presented in Table 15.2 in this Note. From time to time, we may be required to record fair value adjustments on a nonrecurring basis. These nonrecurring fair value adjustments typically involve application of LOCOM accounting, measurement alternative accounting for nonmarketable equity securities or write-downs of individual assets. Assets recorded on a nonrecurring basis are presented in Table 15.10 in this Note. See Note 1 (Summary of Significant Accounting Policies) to Financial Statements in our 2017 Form 10-K for discussion of how we determine fair value. For descriptions of the valuation methodologies we use for assets and liabilities recorded at fair value on a recurring or nonrecurring basis and for estimating fair value for financial instruments that are not recorded at fair value, see Note 17 (Fair Values of Assets and Liabilities) to Financial Statements in our 2017 Form 10-K. FAIR VALUE HIERARCHY We group our assets and liabilities measured at fair value in three levels based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1 – Valuation is based upon quoted prices for identical instruments traded in active markets. • Level 2 – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 – Valuation is generated from techniques that use significant assumptions that are not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. We do not classify an equity security in the fair value hierarchy if we use the non-published net asset value (NAV) per share (or its equivalent) that has been communicated to us as an investor as a practical expedient to measure fair value. We generally use NAV per share as the fair value measurement for certain nonmarketable equity fund investments. Marketable equity securities with published NAVs continue to be classified in the fair value hierarchy. Fair Value Measurements from Vendors For certain assets and liabilities, we obtain fair value measurements from vendors, which predominantly consist of third-party pricing services, and record the unadjusted fair value in our financial statements. For additional information, see Note 17 (Fair Values of Assets and Liabilities) to Financial Statements in our 2017 Form 10-K. Table 15.1 presents unadjusted fair value measurements provided by brokers or third-party pricing services by fair value hierarchy level. Fair value measurements obtained from brokers or third-party pricing services that we have adjusted to determine the fair value recorded in our financial statements are excluded from Table 15.1 . Table 15.1: Fair Value Measurements by Brokers or Third-Party Pricing Services Brokers Third-party pricing services (in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 March 31, 2018 Trading debt securities $ — — — 105 229 — Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies — — — 3,362 2,917 — Securities of U.S. states and political subdivisions — — — — 47,951 44 Mortgage-backed securities — 33 — — 165,656 67 Other debt securities (1) — 231 1,077 — 46,288 139 Total available-for-sale debt securities — 264 1,077 3,362 262,812 250 Equity securities: Marketable — — — — 225 — Nonmarketable — — — — 2 293 Total equity securities — — — — 227 293 Derivative assets — — — 17 — — Derivative liabilities — — — (17 ) — — Other liabilities (2) — — — — — — December 31, 2017 Trading debt securities $ — — — 926 215 — Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies — — — 3,389 2,930 — Securities of U.S. states and political subdivisions — — — — 50,401 49 Mortgage-backed securities — 33 — — 168,948 75 Other debt securities (1) — 307 1,158 — 44,465 22 Total available-for-sale debt securities — 340 1,158 3,389 266,744 146 Equity securities: Marketable — — — — 227 — Nonmarketable — — — — — — Total equity securities — — — — 227 — Derivative assets — — — 19 — — Derivative liabilities — — — (19 ) — — Other liabilities (2) — — — — — — (1) Includes corporate debt securities, collateralized loan and other debt obligations, asset-backed securities, and other debt securities. (2) Includes short sale liabilities and other liabilities. Assets and Liabilities Recorded at Fair Value on a Recurring Basis Table 15.2 presents the balances of assets and liabilities recorded at fair value on a recurring basis. Table 15.2: Fair Value on a Recurring Basis (in millions) Level 1 Level 2 Level 3 Netting Total March 31, 2018 Trading debt securities: Securities of U.S. Treasury and federal agencies $ 13,419 2,720 — — 16,139 Securities of U.S. states and political subdivisions — 3,434 3 — 3,437 Collateralized loan obligations — 645 316 — 961 Corporate debt securities — 12,377 34 — 12,411 Mortgage-backed securities — 25,755 — — 25,755 Asset-backed securities — 1,132 — — 1,132 Other trading debt securities — 13 18 — 31 Total trading debt securities 13,419 46,076 371 — 59,866 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies 3,362 2,917 — — 6,279 Securities of U.S. states and political subdivisions — 49,026 617 — 49,643 Mortgage-backed securities: Federal agencies — 156,814 — — 156,814 Residential — 4,473 1 — 4,474 Commercial — 4,723 67 — 4,790 Total mortgage-backed securities — 166,010 68 — 166,078 Corporate debt securities 54 6,719 410 — 7,183 Collateralized loan and other debt obligations (1) — 35,707 1,045 — 36,752 Asset-backed securities: Automobile loans and leases — 572 — — 572 Home equity loans — 146 — — 146 Other asset-backed securities — 4,501 501 — 5,002 Total asset-backed securities — 5,219 501 — 5,720 Other debt securities — 1 — — 1 Total available-for-sale debt securities 3,416 265,599 2,641 (2) — 271,656 Mortgages held for sale — 12,909 950 — 13,859 Loans held for sale — 1,695 — — 1,695 Loans — — 352 — 352 Mortgage servicing rights (residential) — — 15,041 — 15,041 Derivative assets: Interest rate contracts 20 16,728 99 — 16,847 Commodity contracts — 2,547 28 — 2,575 Equity contracts 1,795 4,562 1,466 — 7,823 Foreign exchange contracts 17 8,707 14 — 8,738 Credit contracts — 231 120 — 351 Netting — — — (24,867 ) (3) (24,867 ) Total derivative assets 1,832 32,775 1,727 (24,867 ) 11,467 Equity securities - excluding securities at NAV: Marketable 29,705 553 — — 30,258 Nonmarketable — 52 5,219 — 5,271 Total equity securities $ 29,705 605 5,219 — 35,529 Total assets included in the fair value hierarchy $ 48,372 359,659 26,301 (24,867 ) 409,465 Equity securities at NAV (4) 32 Total assets recorded at fair value $ 409,497 Derivative liabilities: Interest rate contracts $ (20 ) (15,868 ) (107 ) — (15,995 ) Commodity contracts — (1,439 ) (18 ) — (1,457 ) Equity contracts (1,391 ) (4,598 ) (1,788 ) — (7,777 ) Foreign exchange contracts (17 ) (7,057 ) (13 ) — (7,087 ) Credit contracts — (277 ) (79 ) — (356 ) Netting — — — 24,789 (3) 24,789 Total derivative liabilities (1,428 ) (29,239 ) (2,005 ) 24,789 (7,883 ) Short sale liabilities: Securities of U.S. Treasury and federal agencies (14,243 ) (570 ) — — (14,813 ) Mortgage back securities — (18 ) — — (18 ) Corporate debt securities — (5,962 ) — — (5,962 ) Equity securities (2,459 ) (51 ) — — (2,510 ) Other securities — — — — — Total short sale liabilities (16,702 ) (6,601 ) — — (23,303 ) Other liabilities — — (2 ) — (2 ) Total liabilities recorded at fair value $ (18,130 ) (35,840 ) (2,007 ) 24,789 (31,188 ) (1) Includes collateralized debt obligations of $1.0 billion . (2) Balance primarily consists of securities that are investment grade based on ratings received from the ratings agencies or internal credit grades categorized as investment grade if external ratings are not available. The securities are classified as Level 3 due to limited market activity. (3) Represents balance sheet netting of derivative asset and liability balances and related cash collateral. See Note 14 (Derivatives) for additional information. (4) Consists of certain nonmarketable equity securities that are measured at fair value using NAV per share (or its equivalent) as a practical expedient and are excluded from the fair value hierarchy. (continued on following page) (continued from previous page) (in millions) Level 1 Level 2 Level 3 Netting Total December 31, 2017 Trading debt securities: Securities of U.S. Treasury and federal agencies $ 12,491 2,383 — — 14,874 Securities of U.S. states and political subdivisions — 3,732 3 — 3,735 Collateralized loan obligations — 565 354 — 919 Corporate debt securities — 11,760 31 — 11,791 Mortgage-backed securities — 25,273 — — 25,273 Asset-backed securities — 993 — — 993 Other trading debt securities — 20 19 — 39 Total trading debt securities 12,491 44,726 407 — 57,624 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies 3,389 2,930 — — 6,319 Securities of U.S. states and political subdivisions — 50,401 925 — 51,326 Mortgage-backed securities: Federal agencies — 160,219 — — 160,219 Residential — 4,607 1 — 4,608 Commercial — 4,490 75 — 4,565 Total mortgage-backed securities — 169,316 76 — 169,392 Corporate debt securities 56 7,203 407 — 7,666 Collateralized loan and other debt obligations (1) — 35,036 1,020 — 36,056 Asset-backed securities: Automobile loans and leases — 553 — — 553 Home equity loans — 149 — — 149 Other asset-backed securities — 4,380 566 — 4,946 Total asset-backed securities — 5,082 566 — 5,648 Other debt securities — — — — — Total available-for-sale debt securities 3,445 269,968 2,994 (2) — 276,407 Mortgages held for sale — 15,118 998 — 16,116 Loans held for sale — 1,009 14 — 1,023 Loans — — 376 — 376 Mortgage servicing rights (residential) — — 13,625 — 13,625 Derivative assets: Interest rate contracts 17 17,479 134 — 17,630 Commodity contracts — 2,318 36 — 2,354 Equity contracts 1,698 3,970 1,339 — 7,007 Foreign exchange contracts 19 8,944 10 — 8,973 Credit contracts — 269 122 — 391 Netting — — — (24,127 ) (3) (24,127 ) Total derivative assets 1,734 32,980 1,641 (24,127 ) 12,228 Equity securities - excluding securities at NAV: Marketable 33,931 429 — — 34,360 Nonmarketable — 46 4,821 — 4,867 Total equity securities $ 33,931 475 4,821 — 39,227 Total assets included in the fair value hierarchy $ 51,601 364,276 24,876 (24,127 ) 416,626 Equity securities at NAV (4) — Total assets recorded at fair value $ 416,626 Derivative liabilities: Interest rate contracts $ (17 ) (15,392 ) (63 ) — (15,472 ) Commodity contracts — (1,318 ) (17 ) — (1,335 ) Equity contracts (1,313 ) (5,338 ) (1,850 ) — (8,501 ) Foreign exchange contracts (19 ) (8,546 ) (3 ) — (8,568 ) Credit contracts — (336 ) (86 ) — (422 ) Netting — — — 25,502 (3) 25,502 Total derivative liabilities (1,349 ) (30,930 ) (2,019 ) 25,502 (8,796 ) Short sale liabilities: Securities of U.S. Treasury and federal agencies (10,420 ) (568 ) — — (10,988 ) Corporate debt securities — (4,986 ) — — (4,986 ) Equity securities (2,168 ) (45 ) — — (2,213 ) Other securities — (285 ) — — (285 ) Total short sale liabilities (12,588 ) (5,884 ) — — (18,472 ) Other liabilities — — (3 ) — (3 ) Total liabilities recorded at fair value $ (13,937 ) (36,814 ) (2,022 ) 25,502 (27,271 ) (1) Includes collateralized debt obligations of $1.0 billion . (2) Balance primarily consists of securities that are investment grade based on ratings received from the ratings agencies or internal credit grades categorized as investment grade if external ratings are not available. The securities are classified as Level 3 due to limited market activity. (3) Represents balance sheet netting of derivative asset and liability balances and related cash collateral. See Note 14 (Derivatives) for additional information. (4) Consists of certain nonmarketable equity securities that are measured at fair value using NAV per share (or its equivalent) as a practical expedient and are excluded from the fair value hierarchy. Changes in Fair Value Levels We monitor the availability of observable market data to assess the appropriate classification of financial instruments within the fair value hierarchy and transfer between Level 1, Level 2, and Level 3 accordingly. Observable market data includes but is not limited to quoted prices and market transactions. Changes in economic conditions or market liquidity generally will drive changes in availability of observable market data. Changes in availability of observable market data, which also may result in changing the valuation technique used, are generally the cause of transfers between Level 1, Level 2, and Level 3. Transfers into and out of Level 1, Level 2, and Level 3 are provided within Table 15.3 for the periods presented. The amounts reported as transfers represent the fair value as of the beginning of the quarter in which the transfer occurred. Table 15.3: Transfers Between Fair Value Levels Transfers Between Fair Value Levels Level 1 Level 2 Level 3 (1) (in millions) In Out In Out In Out Total Quarter ended March 31, 2018 Trading debt securities $ — — — — — — — Available-for-sale debt securities — — 269 — — (269 ) — Mortgages held for sale — — 3 (15 ) 15 (3 ) — Loans held for sale — — — — — — — Equity securities — (11 ) 11 (4 ) 4 — — Net derivative assets and liabilities (2) — — (49 ) — — 49 — Short sale liabilities — — — — — — — Total transfers $ — (11 ) 234 (19 ) 19 (223 ) — Quarter ended March 31, 2017 Trading debt securities $ — — 1 (3 ) 3 (1 ) — Available-for-sale debt securities — — 72 (5 ) 5 (72 ) — Mortgages held for sale — — 1 (42 ) 42 (1 ) — Loans held for sale — — — — — — — Equity securities — — — — — — — Net derivative assets and liabilities (2) — — 3 22 (22 ) (3 ) — Short sale liabilities — — — — — — — Total transfers $ — — 77 (28 ) 28 (77 ) — (1) All transfers in and out of Level 3 are disclosed within the recurring Level 3 rollforward tables in this Note. (2) Includes transfers of net derivative assets and net derivative liabilities between levels due to changes in observable market data. The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2018 , are presented in Table 15.4 . Table 15.4: Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis – Quarter ended ended March 31, 2018 Total net gains (losses) included in Purchases, sales, issuances and settlements, net (1) Net unrealized gains (losses) included in income related to assets and liabilities held at period end (in millions) Balance, beginning of period Net income Other compre- hensive income Transfers into Level 3 Transfers out of Level 3 Balance, end of period (2) Quarter ended March 31, 2018 Trading debt securities: Securities of U.S. states and political subdivisions $ 3 — — — — — 3 — Collateralized loan obligations 354 2 — (40 ) — — 316 16 Corporate debt securities 31 — — 3 — — 34 — Mortgage-backed securities — — — — — — — — Asset-backed securities — — — — — — — — Other trading debt securities 19 (1 ) — — — — 18 — Total trading debt securities 407 1 — (37 ) — — 371 16 (3) Available-for-sale debt securities: Securities of U.S. states and political subdivisions 925 4 (2 ) (41 ) — (269 ) 617 — Mortgage-backed securities: Residential 1 — — — — — 1 — Commercial 75 1 (1 ) (8 ) — — 67 — Total mortgage-backed securities 76 1 (1 ) (8 ) — — 68 — Corporate debt securities 407 1 3 (1 ) — — 410 — Collateralized loan and other debt obligations 1,020 5 43 (23 ) — — 1,045 — Asset-backed securities: Automobile loans and leases — — — — — — — — Other asset-backed securities 566 8 (7 ) (66 ) — — 501 — Total asset-backed securities 566 8 (7 ) (66 ) — — 501 — Total available-for-sale debt securities 2,994 19 36 (139 ) — (269 ) 2,641 — (4) Mortgages held for sale 998 (23 ) — (37 ) 15 (3 ) 950 (23 ) (5) Loans held for sale 14 2 — (16 ) — — — — Loans 376 (1 ) — (23 ) — — 352 (4 ) (5) Mortgage servicing rights (residential) (6) 13,625 847 — 569 — — 15,041 1,330 (5) Net derivative assets and liabilities: Interest rate contracts 71 (345 ) — 266 — — (8 ) (73 ) Commodity contracts 19 15 — (24 ) — — 10 — Equity contracts (511 ) 69 — 71 — 49 (322 ) 25 Foreign exchange contracts 7 (7 ) — 1 — — 1 (3 ) Credit contracts 36 8 — (3 ) — — 41 4 Other derivative contracts — — — — — — — — Total derivative contracts (378 ) (260 ) — 311 — 49 (278 ) (47 ) (7) Equity securities: Marketable — — — — — — — — Nonmarketable (8) 5,203 108 — (96 ) 4 — 5,219 101 Total equity securities 5,203 108 — (96 ) 4 — 5,219 101 (9) Short sale liabilities — — — — — — — — (3) Other liabilities (3 ) 1 — — — — (2 ) — (5) (1) See Table 15.5 for detail. (2) Represents only net gains (losses) that are due to changes in economic conditions and management’s estimates of fair value and excludes changes due to the collection/realization of cash flows over time. (3) Included in net gains (losses) from trading activities in the income statement. (4) Included in net gains (losses) from debt securities in the income statement. (5) Included in mortgage banking and other noninterest income in the income statement. (6) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). (7) Included in mortgage banking, trading activities, equity securities and other noninterest income in the income statement. (8) Beginning balance includes $382 million of auction rate securities, which changed from the cost to fair value method of accounting in connection with the adoption of ASU 2016-01 in first quarter 2018. (9) Included in net gains (losses) from equity securities in the income statement. (continued on following page) (continued from previous page) Table 15.5 presents gross purchases, sales, issuances and settlements related to the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2018 . Table 15.5: Gross Purchases, Sales, Issuances and Settlements – Level 3 – Quarter ended March 31, 2018 (in millions) Purchases Sales Issuances Settlements Net Quarter ended March 31, 2018 Trading debt securities: Securities of U.S. states and political subdivisions $ — — — — — Collateralized loan obligations 182 (191 ) — (31 ) (40 ) Corporate debt securities 4 (1 ) — — 3 Mortgage-backed securities — — — — — Asset-backed securities — — — — — Other trading debt securities — — — — — Total trading debt securities 186 (192 ) — (31 ) (37 ) Available-for-sale debt securities: Securities of U.S. states and political subdivisions — (4 ) 10 (47 ) (41 ) Mortgage-backed securities: Residential — — — — — Commercial — — — (8 ) (8 ) Total mortgage-backed securities — — — (8 ) (8 ) Corporate debt securities — — — (1 ) (1 ) Collateralized loan and other debt obligations — — — (23 ) (23 ) Asset-backed securities: Automobile loans and leases — — — — — Other asset-backed securities — (8 ) 49 (107 ) (66 ) Total asset-backed securities — (8 ) 49 (107 ) (66 ) Total available-for-sale debt securities — (12 ) 59 (186 ) (139 ) Mortgages held for sale 27 (83 ) 58 (39 ) (37 ) Loans held for sale — (16 ) — — (16 ) Loans 1 — 4 (28 ) (23 ) Mortgage servicing rights (residential) (1) — (4 ) 573 — 569 Net derivative assets and liabilities: Interest rate contracts — — — 266 266 Commodity contracts — — — (24 ) (24 ) Equity contracts — — — 71 71 Foreign exchange contracts — — — 1 1 Credit contracts 3 (2 ) — (4 ) (3 ) Other derivative contracts — — — — — Total derivative contracts 3 (2 ) — 310 311 Equity securities: Marketable — — — — — Nonmarketable — (17 ) — (79 ) (96 ) Total equity securities — (17 ) — (79 ) (96 ) Short sale liabilities — — — — — Other liabilities — — — — — (1) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2017 , are presented in Table 15.6 . Table 15.6: Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis – Quarter ended March 31, 2017 Balance, beginning of period Total net gains (losses) included in Purchases, sales, issuances and settlements, net (1) Net unrealized gains (losses) included in income related to assets and liabilities held at period end (in millions) Net income Other compre- hensive income Transfers into Level 3 Transfers out of Level 3 Balance, end of period (2) Quarter ended March 31, 2017 Trading debt securities: Securities of U.S. states and $ 3 — — — — — 3 — Collateralized loan obligations 309 4 — 85 — — 398 — Corporate debt securities 34 — — 1 3 (1 ) 37 — Mortgage-backed securities — — — — — — — — Asset-backed securities — — — — — — — — Other trading debt securities 28 — (2 ) — — — 26 (1 ) Total trading debt securities 374 4 (2 ) 86 3 (1 ) 464 — (3) Available-for-sale debt securities: Securities of U.S. states and political subdivisions 1,140 — 2 285 5 (72 ) 1,360 — Mortgage-backed securities: Residential 1 — — — — — 1 — Commercial 91 (3 ) 4 (3 ) — — 89 (4 ) Total mortgage-backed securities 92 (3 ) 4 (3 ) — — 90 (4 ) Corporate debt securities 432 (14 ) 8 (35 ) — — 391 — Collateralized loan and other debt obligations 879 5 41 39 — — 964 — Asset-backed securities: Automobile loans and leases — — — — — — — — Other asset-backed securities 962 — 2 (119 ) — — 845 — Total asset-backed securities 962 — 2 (119 ) — — 845 — Total available-for-sale debt securities 3,505 (12 ) 57 167 5 (72 ) 3,650 (4 ) (4) Mortgages held for sale 985 (9 ) — (60 ) 42 (1 ) 957 (11 ) (5) Loans held for sale — — — — — — — — Loans 758 (6 ) — (247 ) — — 505 (5 ) (5) Mortgage servicing rights (residential) (6) 12,959 (287 ) — 536 — — 13,208 174 (5) Net derivative assets and liabilities: Interest rate contracts 121 209 — (112 ) — — 218 85 Commodity contracts 23 2 — (6 ) — — 19 7 Equity contracts (267 ) (44 ) — 37 (22 ) (3 ) (299 ) (57 ) Foreign exchange contracts 12 (9 ) — — — — 3 (5 ) Credit contracts 77 7 — 3 — — 87 (14 ) Other derivative contracts (47 ) 11 — — — — (36 ) 11 Total derivative contracts (81 ) 176 — (78 ) (22 ) (3 ) (8 ) 27 (7) Equity securities: Marketable — — — — — — — — Nonmarketable 3,259 481 — — — — 3,740 485 Total equity securities 3,259 481 — — — — 3,740 485 (8) Short sale liabilities — — — — — — — — (3) Other liabilities (4 ) — — — — — (4 ) — (5) (1) See Table 15.7 for detail. (2) Represents only net gains (losses) that are due to changes in economic conditions and management’s estimates of fair value and excludes changes due to the collection/realization of cash flows over time. (3) Included in net gains (losses) from trading activities in the income statement. (4) Included in net gains (losses) from debt securities in the income statement. (5) Included in mortgage banking and other noninterest income in the income statement. (6) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). (7) Included in mortgage banking, trading activities, equity securities and other noninterest income in the income statement. (8) Included in net gains (losses) from equity securities in the income statement. (continued on following page) (continued from previous page) Table 15.7 presents gross purchases, sales, issuances and settlements related to the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2017 . Table 15.7: Gross Purchases, Sales, Issuances and Settlements – Level 3 – Quarter ended March 31, 2017 (in millions) Purchases Sales Issuances Settlements Net Quarter ended March 31, 2017 Trading debt securities: Securities of U.S. states and political subdivisions $ 1 (1 ) — — — Collateralized loan obligations 199 (76 ) — (38 ) 85 Corporate debt securities 6 (5 ) — — 1 Mortgage-backed securities — — — — — Asset-backed securities — — — — — Other trading debt securities — — — — — Total trading debt securities 206 (82 ) — (38 ) 86 Available-for-sale debt securities: Securities of U.S. states and political subdivisions — — 346 (61 ) 285 Mortgage-backed securities: Residential — — — — — Commercial — — — (3 ) (3 ) Total mortgage-backed securities — — — (3 ) (3 ) Corporate debt securities 4 — — (39 ) (35 ) Collateralized loan and other debt obligations 72 — — (33 ) 39 Asset-backed securities: Automobile loans and leases — — — — — Other asset-backed securities — — 21 (140 ) (119 ) Total asset-backed securities — — 21 (140 ) (119 ) Total available-for-sale debt securities 76 — 367 (276 ) 167 Mortgages held for sale 22 (156 ) 106 (32 ) (60 ) Loans held for sale — — — — — Loans 1 (129 ) 6 (125 ) (247 ) Mortgage servicing rights (residential) (1) — (47 ) 583 — 536 Net derivative assets and liabilities: Interest rate contracts — — — (112 ) (112 ) Commodity contracts — — — (6 ) (6 ) Equity contracts — — — 37 37 Foreign exchange contracts — — — — — Credit contracts 2 (1 ) — 2 3 Other derivative contracts — — — — — Total derivative contracts 2 (1 ) — (79 ) (78 ) Equity securities: Marketable — — — — — Nonmarketable — — — — — Total equity securities — — — — — Short sale liabilities — — — — — Other liabilities — — — — — (1) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). Table 15.8 and Table 15.9 provide quantitative information about the valuation techniques and significant unobservable inputs used in the valuation of substantially all of our Level 3 assets and liabilities measured at fair value on a recurring basis for which we use an internal model. The significant unobservable inputs for Level 3 assets and liabilities that are valued using fair values obtained from third party vendors are not included in the table, as the specific inputs applied are not provided by the vendor. In addition, the table excludes the valuation techniques and significant unobservable inputs for certain classes of Level 3 assets and liabilities measured using an internal model that we consider, both individually and in the aggregate, insignificant relative to our overall Level 3 assets and liabilities. We made this determination based upon an evaluation of each class, which considered the magnitude of the positions, nature of the unobservable inputs and potential for significant changes in fair value due to changes in those inputs. For information on how changes in significant unobservable inputs affect the fair values of Level 3 assets and liabilities, see Note 17 (Fair Values of Assets and Liabilities) to Financial Statements in our 2017 Form 10-K. Table 15.8: Valuation Techniques – Recurring Basis –March 31, 2018 ($ in millions, except cost to service amounts) Fair Value Level 3 Valuation Technique(s) Significant Unobservable Input Range of Inputs Weighted Average (1) March 31, 2018 Trading and available-for-sale debt securities: Securities of U.S. states and political subdivisions: Government, healthcare and other revenue bonds $ 565 Discounted cash flow Discount rate 1.8 - 6.1 % 2.9 Other municipal bonds 11 Discounted cash flow Discount rate 4.8 - 4.9 4.9 44 Vendor priced Collateralized loan and other debt obligations (2) 316 Market comparable pricing Comparability adjustment (17.0 ) - 21.0 2.6 1,045 Vendor priced Asset-backed securities: Diversified payment rights (3) 253 Discounted cash flow Discount rate 2.8 - 4.4 3.6 Other commercial and consumer 221 (4) Discounted cash flow Discount rate 3.9 - 5.4 4.2 Weighted average life 1.8 - 2.1 yrs 1.9 27 Vendor priced Mortgages held for sale (residential) 930 Discounted cash flow Default rate 0.0 - 8.2 % 1.1 Discount rate 1.1 - 6.9 5.6 Loss severity 0.0 - 47.6 26.4 Prepayment rate 3.0 - 12.6 4.9 20 Market comparable pricing Comparability adjustment (56.3 ) - (6.3 ) (44.0 ) Loans 352 (5) Discounted cash flow Discount rate 3.1 - 7.0 4.2 Prepayment rate 4.4 - 100.0 91.2 Loss severity 0.0 - 33.8 7.5 Mortgage servicing rights (residential) 15,041 Discounted cash flow Cost to service per loan (6) $ 77 - 569 136 Discount rate 7.0 - 13.3 % 7.2 Prepayment rate (7) 8.2 - 20.3 9.3 Net derivative assets and (liabilities): Interest rate contracts (45 ) Discounted cash flow Default rate 0.1 - 5.0 2.1 Loss severity 50.0 - 50.0 50.0 Prepayment rate 2.8 - 12.5 10.2 Interest rate contracts: derivative loan commitments 37 Discounted cash flow Fall-out factor 1.0 - 99.0 19.3 Initial-value servicing (52.5 ) - 122.0 bps 23.6 Equity contracts 120 Discounted cash flow Conversion factor (9.6 ) - 0.0 % (8.9 ) Weighted average life 1.3 - 2.8 yrs 2.0 (442 ) Option model Correlation factor (77.0 ) - 99.0 % 27.5 Volatility factor 6.5 - 100.0 24.9 Credit contracts (3 ) Market comparable pricing Comparability adjustment (24.3 ) - 28.8 0.0 44 Option model Credit spread 0.0 - 9.2 0.6 Loss severity 13.0 - 60.0 48.5 Nonmarketable equity securities 9 Discounted cash flow Discount rate 10.0 - 10.0 10.0 Volatility Factor 0.7 - 2.5 1.9 4,917 Market comparable pricing Comparability adjustment (20.2 ) - (4.8 ) (17.2 ) 293 Vendor priced Insignificant Level 3 assets, net of liabilities 539 (8) Total level 3 assets, net of liabilities $ 24,294 (9) (1) Weighted averages are calculated using outstanding unpaid principal balance for cash instruments, such as loans and securities, and notional amounts for derivative instruments. (2) Includes $1.0 billion of collateralized debt obligations. (3) Securities backed by specified sources of current and future receivables generated from foreign originators. (4) A significant portion of the balance consists of investments in asset-backed securities that are revolving in nature, for which the timing of advances and repayments of principal are uncertain. (5) Consists of reverse mortgage loans. (6) The high end of the range of inputs is for servicing modified loans. For non-modified loans the range is $77 - $246 . (7) Includes a blend of prepayment speeds and expected defaults. Prepayment speeds are influenced by mortgage interest rates as well as our estimation of drivers of borrower behavior. (8) Represents the aggregate amount of Level 3 assets and liabilities measured at fair value on a recurring basis that are individually and in the aggregate insignificant. The amount includes corporate debt securities, mortgage-backed securities, other trading positions, other liabilities and certain net derivative assets and liabilities, such as commodity contracts, foreign exchange contracts, and other derivative contracts. (9) Consists of total Level 3 assets of $26.3 billion and total Level 3 liabilities of $2.0 billion , before netting of derivative balances. Table 15.9: Valuation Techniques – Recurring Basis –December 31, 2017 ($ in millions, except cost to service amounts) Fair Value Level 3 Valuation Technique(s) Significant Unobservable Input Range of Inputs Weighted Average (1) December 31, 2017 Trading and available-for-sale debt securities: Securities of U.S. states and political subdivisions: Government, healthcare and other revenue bonds $ 868 Discounted cash flow Discount rate 1.7 - 5.8 % 2.7 Other municipal bonds 11 Discounted cash flow Discount rate 4.7 - 4.9 4.8 49 Vendor priced Collateralized loan and other debt obligations (2) 354 Market comparable pricing Comparability adjustment (22.0 ) - 19.5 3.0 1,020 Vendor priced Asset-backed securities: Diversified payment rights (3) 292 Discounted cash flow Discount rate 2.4 - 3.9 3.1 Other commercial and consumer 248 (4) Discounted cash flow Discount rate 3.7 - 5.2 3.9 Weighted average life 2.0 - 2.3 yrs 2.1 26 Vendor priced Mortgages held for sale (residential) 974 Discounted cash flow Default rate 0.0 - 7.1 % 1.3 Discount rate 2.6 - 7.3 5.6 Loss severity 0.1 - 41.4 19.6 Prepayment rate 6.5 - 15.9 9.1 24 Market comparable pricing Comparability adjustment (56.3 ) - (6.3 ) (42.7 ) Loans 376 (5) Discounted cash flow Discount rate 3.1 - 7.5 4.2 Prepayment rate 8.7 - 100.0 91.9 Loss severity 0.0 - 33.9 6.6 Mortgage servicing rights (residential) 13,625 Discounted cash flow Cost to service per loan (6) $ 78 - 587 143 Discount rate 6.6 - 12.9 % 6.9 Prepayment rate (7) 9.7 - 20.5 10.5 Net derivative assets and (liabilities): Interest rate contracts 54 Discounted c

Preferred Stock

Preferred Stock	3 Months Ended
	Mar. 31, 2018
Preferred Stock [Abstract]
Preferred Stock	Note 16: Preferred Stock We are authorized to issue 20 million shares of preferred stock and 4 million shares of preference stock, both without par value. Preferred shares outstanding rank senior to common shares both as to dividends and liquidation preference but have no general voting rights. We have not issued any preference shares under this authorization. If issued, preference shares would be limited to one vote per share. Our total authorized, issued and outstanding preferred stock is presented in the following two tables along with the Employee Stock Ownership Plan (ESOP) Cumulative Convertible Preferred Stock. Table 16.1: Preferred Stock Shares March 31, 2018 December 31, 2017 Liquidation preference per share Shares authorized and designated Liquidation preference per share Shares authorized and designated DEP Shares Dividend Equalization Preferred Shares (DEP) $ 10 97,000 $ 10 97,000 Series I Floating Class A Preferred Stock 100,000 25,010 100,000 25,010 Series J 8.00% Non-Cumulative Perpetual Class A Preferred Stock 1,000 2,300,000 1,000 2,300,000 Series K 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 1,000 3,500,000 1,000 3,500,000 Series L 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock 1,000 4,025,000 1,000 4,025,000 Series N 5.20% Non-Cumulative Perpetual Class A Preferred Stock 25,000 30,000 25,000 30,000 Series O 5.125% Non-Cumulative Perpetual Class A Preferred Stock 25,000 27,600 25,000 27,600 Series P 5.25% Non-Cumulative Perpetual Class A Preferred Stock 25,000 26,400 25,000 26,400 Series Q 5.85% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 69,000 25,000 69,000 Series R 6.625% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 34,500 25,000 34,500 Series S 5.90% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 80,000 25,000 80,000 Series T 6.00% Non-Cumulative Perpetual Class A Preferred Stock 25,000 32,200 25,000 32,200 Series U 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 80,000 25,000 80,000 Series V 6.00% Non-Cumulative Perpetual Class A Preferred Stock 25,000 40,000 25,000 40,000 Series W 5.70% Non-Cumulative Perpetual Class A Preferred Stock 25,000 40,000 25,000 40,000 Series X 5.50% Non-Cumulative Perpetual Class A Preferred Stock 25,000 46,000 25,000 46,000 Series Y 5.625% Non-Cumulative Perpetual Class A Preferred Stock 25,000 27,600 25,000 27,600 ESOP Cumulative Convertible Preferred Stock (1) — 2,425,104 — 1,556,104 Total 12,905,414 12,036,414 (1) See the ESOP Cumulative Convertible Preferred Stock section in this Note for additional information about the liquidation preference for the ESOP Cumulative Convertible Preferred Stock. Table 16.2: Preferred Stock – Shares Issued and Carrying Value March 31, 2018 December 31, 2017 (in millions, except shares) Shares issued and outstanding Liquidation preference value Carrying value Discount Shares issued and outstanding Liquidation preference value Carrying value Discount DEP Shares Dividend Equalization Preferred Shares (DEP) 96,546 $ — — — 96,546 $ — — — Series I (1) Floating Class A Preferred Stock 25,010 2,501 2,501 — 25,010 2,501 2,501 — Series J (1) 8.00% Non-Cumulative Perpetual Class A Preferred Stock 2,150,375 2,150 1,995 155 2,150,375 2,150 1,995 155 Series K (1) 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 3,352,000 3,352 2,876 476 3,352,000 3,352 2,876 476 Series L (1) 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock 3,968,000 3,968 3,200 768 3,968,000 3,968 3,200 768 Series N (1) 5.20% Non-Cumulative Perpetual Class A Preferred Stock 30,000 750 750 — 30,000 750 750 — Series O (1) 5.125% Non-Cumulative Perpetual Class A Preferred Stock 26,000 650 650 — 26,000 650 650 — Series P (1) 5.25% Non-Cumulative Perpetual Class A Preferred Stock 25,000 625 625 — 25,000 625 625 — Series Q (1) 5.85% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 69,000 1,725 1,725 — 69,000 1,725 1,725 — Series R (1) 6.625% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 33,600 840 840 — 33,600 840 840 — Series S (1) 5.90% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 80,000 2,000 2,000 — 80,000 2,000 2,000 — Series T (1) 6.00% Non-Cumulative Perpetual Class A Preferred Stock 32,000 800 800 — 32,000 800 800 — Series U (1) 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 80,000 2,000 2,000 — 80,000 2,000 2,000 — Series V (1) 6.00% Non-Cumulative Perpetual Class A Preferred Stock 40,000 1,000 1,000 — 40,000 1,000 1,000 — Series W (1) 5.70% Non-Cumulative Perpetual Class A Preferred Stock 40,000 1,000 1,000 — 40,000 1,000 1,000 — Series X (1) 5.50% Non-Cumulative Perpetual Class A Preferred Stock 46,000 1,150 1,150 — 46,000 1,150 1,150 — Series Y (1) 5.625% Non-Cumulative Perpetual Class A Preferred Stock 27,600 690 690 — 27,600 690 690 — ESOP Cumulative Convertible Preferred Stock 2,425,104 2,425 2,425 — 1,556,104 1,556 1,556 — Total 12,546,235 $ 27,626 26,227 1,399 11,677,235 $ 26,757 25,358 1,399 (1) Preferred shares qualify as Tier 1 capital. See Note 9 (Securitizations and Variable Interest Entities) for additional information on our trust preferred securities. ESOP CUMULATIVE CONVERTIBLE PREFERRED STOCK All shares of our ESOP Cumulative Convertible Preferred Stock (ESOP Preferred Stock) were issued to a trustee acting on behalf of the Wells Fargo & Company 401(k) Plan (the 401(k) Plan). Dividends on the ESOP Preferred Stock are cumulative from the date of initial issuance and are payable quarterly at annual rates based upon the year of issuance. Each share of ESOP Preferred Stock released from the unallocated reserve of the 401(k) Plan is converted into shares of our common stock based on the stated value of the ESOP Preferred Stock and the then current market price of our common stock. The ESOP Preferred Stock is also convertible at the option of the holder at any time, unless previously redeemed. We have the option to redeem the ESOP Preferred Stock at any time, in whole or in part, at a redemption price per share equal to the higher of (a) $1,000 per share plus accrued and unpaid dividends or (b) the fair market value, as defined in the Certificates of Designation for the ESOP Preferred Stock. Table 16.3: ESOP Preferred Stock Shares issued and outstanding Carrying value Adjustable dividend rate (in millions, except shares) Mar 31, Dec 31, Mar 31, Dec 31, Minimum Maximum ESOP Preferred Stock $1,000 liquidation preference per share 2018 1,100,000 — $ 1,100 — 7.00 % 8.00 2017 249,210 273,210 249 273 7.00 8.00 2016 268,826 322,826 269 323 9.30 10.30 2015 167,436 187,436 167 187 8.90 9.90 2014 212,151 237,151 212 237 8.70 9.70 2013 169,948 201,948 170 202 8.50 9.50 2012 105,634 128,634 106 129 10.00 11.00 2011 99,296 129,296 99 129 9.00 10.00 2010 52,603 75,603 53 76 9.50 10.50 Total ESOP Preferred Stock (1) 2,425,104 1,556,104 $ 2,425 1,556 Unearned ESOP shares (2) $ (2,571 ) (1,678 ) (1) At March 31, 2018 and December 31, 2017 , additional paid-in capital included $146 million and $122 million , respectively, related to ESOP preferred stock. (2) We recorded a corresponding charge to unearned ESOP shares in connection with the issuance of the ESOP Preferred Stock. The unearned ESOP shares are reduced as shares of the ESOP Preferred Stock are committed to be released.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Our revenue includes net interest income on financial instruments and noninterest income. Table 17.1 presents our revenue by operating segment. The other segment for each of the tables below includes the elimination of certain items that are included in more than one business segment, most of which represents products and services for WIM customers served through Community Banking distribution channels. For additional description of our operating segments, including additional financial information and the underlying management accounting process, see Note 21 (Operating Segments) to Financial Statements in this Report. Table 17.1 : Revenue by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net interest income (1) $ 7,195 7,132 4,532 4,681 1,112 1,141 (601 ) (630 ) 12,238 12,324 Noninterest income: Service charges on deposit accounts 639 742 534 570 4 5 (4 ) (4 ) 1,173 1,313 Trust and investment fees: Brokerage advisory, commissions and other fees 478 444 67 84 2,344 2,245 (486 ) (449 ) 2,403 2,324 Trust and investment management 233 218 113 129 743 707 (239 ) (225 ) 850 829 Investment banking (10 ) (27 ) 440 445 — (1 ) — — 430 417 Total trust and investment fees 701 635 620 658 3,087 2,951 (725 ) (674 ) 3,683 3,570 Card fees 821 865 87 80 1 1 (1 ) (1 ) 908 945 Other fees: Charges and fees on loans (1) 74 84 227 223 1 1 (1 ) (1 ) 301 307 Cash network fees 125 123 1 3 — — — — 126 126 Commercial real estate brokerage commissions — — 85 81 — — — — 85 81 Letters of credit fees (1) 2 1 77 73 1 1 (1 ) (1 ) 79 74 Wire transfer and other remittance fees 63 57 52 49 2 2 (1 ) (1 ) 116 107 All other fees 63 130 30 39 — 1 — — 93 170 Total other fees 327 395 472 468 4 5 (3 ) (3 ) 800 865 Mortgage banking (1) 842 1,106 93 123 (3 ) (2 ) 2 1 934 1,228 Insurance (1) 28 34 79 234 18 20 (11 ) (11 ) 114 277 Net gains (losses) from trading activities (1) (1 ) (52 ) 225 290 19 34 — — 243 272 Net gains (losses) on debt securities (1) — 102 1 (66 ) — — — — 1 36 Net gains from equity securities (1) 684 468 93 36 6 66 — — 783 570 Lease income (1) — — 455 481 — — — — 455 481 Other income of the segment (1) 594 396 88 22 (6 ) 36 (74 ) (80 ) 602 374 Total noninterest income 4,635 4,691 2,747 2,896 3,130 3,116 (816 ) (772 ) 9,696 9,931 Revenue $ 11,830 11,823 7,279 7,577 4,242 4,257 (1,417 ) (1,402 ) 21,934 22,255 (1) These revenues are not within the scope of ASU 2014-09 – Revenue from Contracts with Customers , and additional details are included in other footnotes to our financial statements. The scope explicitly excludes net interest income as well as many other revenues for financial assets and liabilities, including loans, leases, securities, and derivatives. Following is a discussion of key revenues within the scope of ASU 2014-09 – Revenue from Contracts with Customers (“the new revenue guidance”). We provide services to customers which have related performance obligations that we complete to recognize revenue. Our revenues are generally recognized either immediately upon the completion of our service or over time as we perform services. Any services performed over time generally require that we render services each period and therefore we measure our progress in completing these services based upon the passage of time. SERVICE CHARGES ON DEPOSIT ACCOUNTS are earned on depository accounts for commercial and consumer customers and include fees for account and overdraft services. Account charges include fees for periodic account maintenance activities and event-driven services such as stop payment fees. Our obligation for event-driven services is satisfied at the time of the event when the service is delivered, while our obligation for maintenance services is satisfied over the course of each month. Our obligation for overdraft services is satisfied at the time of the overdraft. Table 17.2 presents our service charges on deposit accounts by operating segment. Table 17.2 : Service Charges on Deposit Accounts by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Overdraft fees $ 412 484 2 2 — — — — 414 486 Account charges 227 258 532 568 4 5 (4 ) (4 ) 759 827 Service charges on deposit accounts $ 639 742 534 570 4 5 (4 ) (4 ) 1,173 1,313 BROKERAGE ADVISORY, COMMISSIONS AND OTHER FEES are earned for providing full-service and discount brokerage services predominantly to retail brokerage clients. These revenues include fees earned on asset-based and transactional accounts and other brokerage advisory services. Asset-based revenues are charged based on the market value of the client’s assets. The services and related obligations associated with certain of these revenues, which include investment advice, active management of client assets, or assistance with selecting and engaging a third-party advisory manager, are generally satisfied over a month or quarter. The remaining revenues include trailing commissions which are earned for selling shares to investors. Our obligation associated with earning trailing commissions is satisfied at the time shares are sold. However, these fees are received and recognized over time during the period the customer owns the shares and we remain the broker of record. The amount of trailing commissions is variable based on the length of time the customer holds the shares and on changes in the value of the underlying assets. Transactional revenues are earned for executing transactions at the client’s direction. Our obligation is generally satisfied upon the execution of the transaction and the fees are based on the size and number of transactions executed. Other revenues earned from other brokerage advisory services include omnibus and networking fees received from mutual fund companies in return for providing record keeping and other administrative services, and annual account maintenance fees charged to customers. Table 17.3 presents our brokerage advisory, commissions and other fees by operating segment. Table 17.3 : Brokerage Advisory, Commissions and Other Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Asset-based revenue (1) $ 371 326 — — 1,743 1,599 (371 ) (326 ) 1,743 1,599 Transactional revenue 93 100 12 10 439 479 (100 ) (105 ) 444 484 Other revenue 14 18 55 74 162 167 (15 ) (18 ) 216 241 Brokerage advisory, commissions and other fees $ 478 444 67 84 2,344 2,245 (486 ) (449 ) 2,403 2,324 (1) We earned $331 million in trailing commissions in the first quarter of both 2018 and 2017, respectively. TRUST AND INVESTMENT MANAGEMENT FEES are earned for providing trust, investment management and other related services. Investment management services include managing and administering assets, including mutual funds, and institutional separate accounts. Fees for these services are generally determined based on a tiered scale relative to the market value of assets under management (AUM). In addition to AUM we have client assets under administration (AUA) that earn various administrative fees which are generally based on the extent of the services provided to administer the account. Services with AUM and AUA-based fees are generally performed over time. Trust services include acting as a trustee or agent for corporate trust, personal trust, and agency assets. Obligations for trust services are generally satisfied over time, while obligations for activities that are transactional in nature are satisfied at the time of the transaction. Other related services include the custody and safekeeping of accounts. Our obligation for these services is generally satisfied over time. Table 17.4 presents our trust and investment management fees by operating segment. Table 17.4 : Trust and Investment Management Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Investment management fees $ — 1 — — 534 500 — — 534 501 Trust fees 221 217 86 104 188 184 (239 ) (225 ) 256 280 Other revenue 12 — 27 25 21 23 — — 60 48 Trust and investment management fees $ 233 218 113 129 743 707 (239 ) (225 ) 850 829 INVESTMENT BANKING FEES are earned for underwriting debt and equity securities, arranging loan syndications and performing other advisory services. Our obligation for these services is generally satisfied at closing of the transaction. CARD FEES include credit and debit card interchange and network revenues and various card-related fees. Card-related fees such as late fees, cash advance fees, and balance transfer fees are loan-related and excluded from the scope of the new revenue guidance. Credit and debit card interchange and network revenues are earned on credit and debit card transactions conducted through payment networks such as Visa, MasterCard, and American Express. Our obligation is satisfied concurrently with the delivery of services on a daily basis . Table 17.5 presents our card fees by operating segment. Table 17.5 : Card Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Credit card interchange and network revenues (1) $ 171 219 87 80 1 1 (1 ) (1 ) 258 299 Debit card interchange and network revenues 479 465 — — — — — — 479 465 Late fees, cash advance fees, balance transfer fees, and annual fees 171 181 — — — — — — 171 181 Card fees (1) $ 821 865 87 80 1 1 (1 ) (1 ) 908 945 (1) The cost of credit card rewards and rebates of $343 million and $277 million for the quarters ended March 31, 2018 and March 31, 2017, respectively, are presented net against the related revenues. CASH NETWORK FEES are earned for processing ATM transactions. Our obligation is completed daily upon settlement of ATM transactions. COMMERCIAL REAL ESTATE BROKERAGE COMMISSIONS are earned for assisting customers in the sale of real estate property. Our obligation is satisfied upon the successful brokering of a transaction. Fees are based on a fixed percentage of the sales price. WIRE TRANSFER AND OTHER REMITTANCE FEES consist of fees earned for funds transfer services and issuing cashier’s checks and money orders. Our obligation is satisfied at the time of the funds transfer services or upon issuance of the cashier’s check or money order. ALL OTHER FEES include various types of fees earned on services to customers which have related performance obligations that we complete to recognize revenue. A significant portion of the revenue is earned from providing business payroll services and merchant services, which are generally recognized over time as we perform the services.

Employee Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Employee Benefits	Note 18: Employee Benefits We sponsor a frozen noncontributory qualified defined benefit retirement plan, the Wells Fargo & Company Cash Balance Plan (Cash Balance Plan), which covers eligible employees of Wells Fargo. The Cash Balance Plan was frozen on July 1, 2009, and no new benefits accrue after that date. Table 18.1 presents the components of net periodic benefit cost. Table 18.1: Net Periodic Benefit Cost 2018 2017 Pension benefits Pension benefits (in millions) Qualified Non-qualified Other benefits Qualified Non-qualified Other benefits Quarter ended March 31, Service cost $ 1 — — 1 — — Interest cost (1) 98 5 5 103 6 7 Expected return on plan assets (1) (160 ) — (7 ) (163 ) — (7 ) Amortization of net actuarial loss (gain) (1) 33 3 (4 ) 38 2 (2 ) Amortization of prior service credit (1) — — (3 ) — — (3 ) Settlement loss (1) — 3 — 1 2 — Net periodic benefit cost (income) $ (28 ) 11 (9 ) (20 ) 10 (5 ) (1) Effective January 1, 2018, we adopted ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . Accordingly, 2018 balances are reported in other noninterest expense on the consolidated statement of income. For 2017, these balances were reported in employee benefits.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Note 19: Earnings Per Common Share Table 19.1 shows earnings per common share and diluted earnings per common share and reconciles the numerator and denominator of both earnings per common share calculations. Table 19.1: Earnings Per Common Share Calculations Quarter ended March 31, (in millions, except per share amounts) 2018 2017 Wells Fargo net income (1) $ 5,136 5,634 Less: Preferred stock dividends and other 403 401 Wells Fargo net income applicable to common stock (numerator) (1) $ 4,733 5,233 Earnings per common share Average common shares outstanding (denominator) 4,885.7 5,008.6 Per share (1) $ 0.97 1.05 Diluted earnings per common share Average common shares outstanding 4,885.7 5,008.6 Add: Stock options 9.9 21.2 Restricted share rights 28.3 28.0 Warrants 6.8 12.6 Diluted average common shares outstanding (denominator) 4,930.7 5,070.4 Per share (1) $ 0.96 1.03 (1) Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017. Table 19.2 presents the outstanding options to purchase shares of common stock that were anti-dilutive (the exercise price was higher than the weighted-average market price), and therefore not included in the calculation of diluted earnings per common share. Table 19.2: Outstanding Anti-Dilutive Options Weighted-average shares Quarter ended March 31, (in millions) 2018 2017 Options 0.9 2.2

Other Comprehensive Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2018
Cumulative Other Comprehensive Income Balances [Abstract]
Other Comprehensive Income	Note 20: Other Comprehensive Income Table 20.1 provides the components of other comprehensive income (OCI), reclassifications to net income by income statement line item, and the related tax effects. Table 20.1: Summary of Other Comprehensive Income Quarter ended March 31, 2018 2017 (in millions) Before tax Tax effect Net of tax Before tax Tax effect Net of tax Debt securities (1): Net unrealized gains (losses) arising during the period $ (3,443 ) 848 (2,595 ) 369 (133 ) 236 Reclassification of net (gains) losses to net income: Interest income on debt securities (2) 69 (17 ) 52 7 (3 ) 4 Net gains on debt securities (1 ) — (1 ) (36 ) 13 (23 ) Net gains from equity securities (3) — — — (116 ) 44 (72 ) Subtotal reclassifications to net income 68 (17 ) 51 (145 ) 54 (91 ) Net change (3,375 ) 831 (2,544 ) 224 (79 ) 145 Derivatives and hedging activities: Fair Value Hedges: Change in fair value of excluded components on fair value hedges (4) 24 (6 ) 18 (226 ) 85 (141 ) Cash Flow Hedges: Net unrealized losses arising during the period on cash flow hedges (266 ) 66 (200 ) (136 ) 51 (85 ) Reclassification of net (gains) losses to net income on cash flow hedges: Interest income on loans 60 (15 ) 45 (205 ) 77 (128 ) Interest expense on long-term debt — — — 3 (1 ) 2 Subtotal reclassifications to net income 60 (15 ) 45 (202 ) 76 (126 ) Net change (182 ) 45 (137 ) (564 ) 212 (352 ) Defined benefit plans adjustments: Net actuarial and prior service gains (losses) arising during the period 6 (2 ) 4 (7 ) 3 (4 ) Reclassification of amounts to net periodic benefit costs (5): Amortization of net actuarial loss 32 (8 ) 24 38 (14 ) 24 Settlements and other — 1 1 — — — Subtotal reclassifications to net periodic benefit costs 32 (7 ) 25 38 (14 ) 24 Net change 38 (9 ) 29 31 (11 ) 20 Foreign currency translation adjustments: Net unrealized gains (losses) arising during the period (2 ) (5 ) (7 ) 16 1 17 Net change (2 ) (5 ) (7 ) 16 1 17 Other comprehensive loss $ (3,521 ) 862 (2,659 ) (293 ) 123 (170 ) Less: Other comprehensive income from noncontrolling interests, net of tax — 14 Wells Fargo other comprehensive loss, net of tax $ (2,659 ) (184 ) (1) After adoption of ASU 2016-01 on January 1, 2018, these lines reflect only net unrealized gains and reclassification of net gains from debt securities. The quarter ended March 31, 2017, includes net unrealized gains arising during the period from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million. (2) Represents net unrealized gains and losses amortized over the remaining lives of securities that were transferred from the available-for-sale portfolio to the held-to-maturity portfolio. (3) Net gains from equity securities is presented for table presentation purposes. After adoption of ASU 2016-01 on January 1, 2018, this line does not contain balances as realized and unrealized gains and losses on marketable equity securities are recorded in earnings. (4) Represents changes in fair value of cross-currency swaps attributable to changes in cross-currency basis spreads, which are excluded from the assessment of effectiveness recorded in other comprehensive income. (5) These items are included in the computation of net periodic benefit cost, which is recorded in employee benefits expense (see Note 18 (Employee Benefits) for additional details). Table 20.2: Cumulative OCI Balances (in millions) Debt securities (1) Derivatives and hedging activities Defined benefit plans adjustments Foreign currency translation adjustments Cumulative other compre- hensive income Quarter ended March 31, 2018 Balance, beginning of period $ 171 (418 ) (1,808 ) (89 ) (2,144 ) Transition adjustment (2) (118 ) — — — (118 ) Balance, January 1, 2018 53 (418 ) (1,808 ) (89 ) (2,262 ) Net unrealized gains (losses) arising during the period (2,595 ) (182 ) 4 (7 ) (2,780 ) Amounts reclassified from accumulated other comprehensive income 51 45 25 — 121 Net change (2,544 ) (137 ) 29 (7 ) (2,659 ) Less: Other comprehensive income from noncontrolling interests — — — — — Balance, end of period $ (2,491 ) (555 ) (1,779 ) (96 ) (4,921 ) Quarter ended March 31, 2017 Balance, beginning of period $ (1,099 ) 89 (1,943 ) (184 ) (3,137 ) Transition adjustment (3) — 168 — — 168 Balance, January 1, 2017 (1,099 ) 257 (1,943 ) (184 ) (2,969 ) Net unrealized gains (losses) arising during the period 236 (226 ) (4 ) 17 23 Amounts reclassified from accumulated other comprehensive income (91 ) (126 ) 24 — (193 ) Net change 145 (352 ) 20 17 (170 ) Less: Other comprehensive income from noncontrolling interests 13 — — 1 14 Balance, end of period $ (967 ) (95 ) (1,923 ) (168 ) (3,153 ) (1) After adoption of ASU 2016-01 on January 1, 2018, the balances only reflect net unrealized gains and reclassification of net gains from debt securities. The quarter ended March 31, 2017, includes net unrealized gains arising during the period from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million . (2) The transition adjustment relates to the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . See Note 1 (Summary of Significant Accounting Policies) for more information. (3) The transition adjustment relates to the adoption of ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . See Note 1 (Summary of Significant Accounting Policies) for more information.

Operating Segments

Operating Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Operating Segments	Note 21: Operating Segments We have three reportable operating segments: Community Banking; Wholesale Banking; and Wealth and Investment Management (WIM). We define our operating segments by product type and customer segment and their results are based on our management accounting process, for which there is no comprehensive, authoritative guidance equivalent to GAAP for financial accounting. The management accounting process measures the performance of the operating segments based on our management structure and is not necessarily comparable with similar information for other financial services companies. If the management structure and/or the allocation process changes, allocations, transfers and assignments may change. Effective first quarter 2018, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on a more granular level. This methodology change affects results across all three of our reportable operating segments and prior period operating segment results have been revised to reflect this methodology change. Our previously reported consolidated financial results were not impacted by the methodology change; however, in connection with the adoption of ASU 2016-01 in first quarter 2018, certain reclassifications have occurred within noninterest income. For a description of our operating segments see Note 25 (Operating Segments) to Financial Statements in our 2017 Form 10-K. Table 21.1 presents our results by operating segment. Table 21.1: Operating Segments Community Banking Wholesale Banking Wealth and Investment Management Other (1) Consolidated Company (income/expense in millions, average balances in billions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Quarter ended March 31, Net interest income (2) $ 7,195 7,132 4,532 4,681 1,112 1,141 (601 ) (630 ) 12,238 12,324 Provision (reversal of provision) for credit losses 218 646 (20 ) (43 ) (6 ) (4 ) (1 ) 6 191 605 Noninterest income 4,635 4,691 2,747 2,896 3,130 3,116 (816 ) (772 ) 9,696 9,931 Noninterest expense 8,702 7,281 3,978 4,167 3,290 3,204 (928 ) (860 ) 15,042 13,792 Income (loss) before income tax expense (benefit) 2,910 3,896 3,321 3,453 958 1,057 (488 ) (548 ) 6,701 7,858 Income tax expense (benefit) 809 982 448 973 239 386 (122 ) (208 ) 1,374 2,133 Net income (loss) before noncontrolling interests 2,101 2,914 2,873 2,480 719 671 (366 ) (340 ) 5,327 5,725 Less: Net income (loss) from noncontrolling interests 188 90 (2 ) (5 ) 5 6 — — 191 91 Net income (loss) (3) $ 1,913 2,824 2,875 2,485 714 665 (366 ) (340 ) 5,136 5,634 Average loans $ 470.5 480.7 465.1 468.3 73.9 70.7 (58.5 ) (56.1 ) 951.0 963.6 Average assets 1,061.9 1,095.8 829.2 810.5 84.2 81.8 (59.4 ) (57.1 ) 1,915.9 1,931.0 Average deposits 747.5 717.8 446.0 465.3 177.9 197.5 (74.2 ) (81.4 ) 1,297.2 1,299.2 (1) Includes the elimination of certain items that are included in more than one business segment, most of which represents products and services for Wealth and Investment Management customers served through Community Banking distribution channels. (2) Net interest income is the difference between interest earned on assets and the cost of liabilities to fund those assets. Interest earned includes actual interest earned on segment assets as well as interest credits for any funding of a segment available to be provided to other segments. The cost of liabilities includes actual interest expense on segment liabilities as well as funding charges for any funding provided from other segments. (3) Represents segment net income (loss) for Community Banking; Wholesale Banking; and Wealth and Investment Management segments and Wells Fargo net income for the consolidated company.

Regulatory and Agency Capital R

Regulatory and Agency Capital Requirements	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
Regulatory and Agency Capital Requirements	Note 22: Regulatory and Agency Capital Requirements The Company and each of its subsidiary banks are subject to regulatory capital adequacy requirements promulgated by federal bank regulatory agencies. The Federal Reserve establishes capital requirements for the consolidated financial holding company, and the OCC has similar requirements for the Company’s national banks, including Wells Fargo Bank, N.A. (the Bank). Table 22.1 presents regulatory capital information for Wells Fargo & Company and the Bank using Basel III, which increased minimum required capital ratios, and introduced a minimum Common Equity Tier 1 (CET1) ratio. We must report the lower of our CET1, tier 1 and total capital ratios calculated under the Standardized Approach and under the Advanced Approach in the assessment of our capital adequacy. The Standardized Approach applies assigned risk weights to broad risk categories, while the calculation of risk-weighted assets (RWAs) under the Advanced Approach differs by requiring applicable banks to utilize a risk-sensitive methodology, which relies upon the use of internal credit models, and includes an operational risk component. The Basel III capital rules are being phased-in effective January 1, 2014, through the end of 2021. Beginning January 1, 2018, the requirements for calculating CET1 and tier 1 capital, along with RWAs, were fully phased-in. Accordingly, the information presented reflects fully phased-in CET1 capital, tier 1 capital, and RWAs, but reflects total capital with Transition Requirements . The Bank is an approved seller/servicer of mortgage loans and is required to maintain minimum levels of shareholders’ equity, as specified by various agencies, including the United States Department of Housing and Urban Development, GNMA, FHLMC and FNMA. At March 31, 2018 , the Bank met these requirements. Other subsidiaries, including the Company’s insurance and broker-dealer subsidiaries, are also subject to various minimum capital levels, as defined by applicable industry regulations. The minimum capital levels for these subsidiaries, and related restrictions, are not significant to our consolidated operations. Table 22.1: Regulatory Capital Information Wells Fargo & Company Wells Fargo Bank, N.A. March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (in millions, except ratios) Advanced Approach Standardized Approach Advanced Approach Standardized Advanced Approach Standardized Advanced Approach Standardized Regulatory capital: Common equity tier 1 $ 152,304 152,304 154,765 154,765 141,049 141,049 143,292 143,292 Tier 1 175,810 175,810 178,209 178,209 141,049 141,049 143,292 143,292 Total 207,531 216,237 210,333 220,097 154,939 163,259 156,661 165,734 Assets: Risk-weighted $ 1,203,464 1,278,113 1,199,545 1,260,663 1,094,474 1,185,860 1,090,360 1,169,863 Adjusted average (1) 1,886,209 1,886,209 1,905,568 1,905,568 1,689,250 1,689,250 1,708,828 1,708,828 Regulatory capital ratios: Common equity tier 1 capital 12.66 % 11.92 * 12.90 12.28 * 12.89 11.89 * 13.14 12.25 * Tier 1 capital 14.61 13.76 * 14.86 14.14 * 12.89 11.89 * 13.14 12.25 * Total capital 17.24 16.92 * 17.53 17.46 * 14.16 13.77 * 14.37 14.17 * Tier 1 leverage (1) 9.32 9.32 9.35 9.35 8.35 8.35 8.39 8.39 *Denotes the lowest capital ratio as determined under the Advanced and Standardized Approaches. (1) The leverage ratio consists of Tier 1 capital divided by quarterly average total assets, excluding goodwill and certain other items. Table 22.2 presents the minimum required regulatory capital ratios under Transition Requirements to which the Company and the Bank were subject as of March 31, 2018 and December 31, 2017 . Table 22.2: Minimum Required Regulatory Capital Ratios – Transition Requirements (1) Wells Fargo & Company Wells Fargo Bank, N.A. March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Regulatory capital ratios: Common equity tier 1 capital 7.875 % 6.750 6.375 5.750 Tier 1 capital 9.375 8.250 7.875 7.250 Total capital 11.375 10.250 9.875 9.250 Tier 1 leverage 4.000 4.000 4.000 4.000 (1) At March 31, 2018 , under transition requirements, the CET1, tier 1 and total capital minimum ratio requirements for Wells Fargo & Company include a capital conservation buffer of 1.875% and a global systemically important bank (G-SIB) surcharge of 1.500% . Only the 1.875% capital conservation buffer applies to the Bank at March 31, 2018 .

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Significant Accounting Policies [Line Items]
Nature of Operations	Wells Fargo & Company is a diversified financial services company. We provide banking, trust and investments, mortgage banking, investment banking, retail banking, brokerage, and consumer and commercial finance through banking locations, the internet and other distribution channels to consumers, businesses and institutions in all 50 states, the District of Columbia, and in foreign countries. When we refer to “Wells Fargo,” “the Company,” “we,” “our” or “us,” we mean Wells Fargo & Company and Subsidiaries (consolidated). Wells Fargo & Company (the Parent) is a financial holding company and a bank holding company. We also hold a majority interest in a real estate investment trust, which has publicly traded preferred stock outstanding.
Use of Estimates	Our accounting and reporting policies conform with U.S. generally accepted accounting principles (GAAP) and practices in the financial services industry. For discussion of our significant accounting policies, see Note 1 (Summary of Significant Accounting Policies) in our Annual Report on Form 10-K for the year ended December 31, 2017 ( 2017 Form 10-K). To prepare the financial statements in conformity with GAAP, management must make estimates based on assumptions about future economic and market conditions (for example, unemployment, market liquidity, real estate prices, etc.) that affect the reported amounts of assets and liabilities at the date of the financial statements, income and expenses during the reporting period and the related disclosures. Although our estimates contemplate current conditions and how we expect them to change in the future, it is reasonably possible that actual conditions could be worse than anticipated in those estimates, which could materially affect our results of operations and financial condition. Management has made significant estimates in several areas, including: • allowance for credit losses (Note 6 (Loans and Allowance for Credit Losses)); • valuations of residential mortgage servicing rights (MSRs) (Note 9 (Securitizations and Variable Interest Entities) and Note 10 (Mortgage Banking Activities)) and financial instruments (Note 15 (Fair Values of Assets and Liabilities)); • liabilities for contingent litigation losses (Note 13 (Legal Actions)); and • income taxes. Actual results could differ from those estimates.
Comparability of Prior Year Financial Data	These unaudited interim financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the periods presented. These adjustments are of a normal recurring nature, unless otherwise disclosed in this Form 10-Q. The results of operations in the interim financial statements do not necessarily indicate the results that may be expected for the full year. The interim financial information should be read in conjunction with our 2017 Form 10-K.
Accounting Standards Adopted in 2018	Accounting Standards Adopted in 2018 In first quarter 2018 , we adopted the following new accounting guidance: • Accounting Standards Update (ASU or Update) 2017-09 – Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting; • ASU 2017-07 – Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost; • ASU 2017-05 – Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets; • ASU 2017-01 – Business Combinations (Topic 805): Clarifying the Definition of a Business; • ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash; • ASU 2016-16 – Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory; • ASU 2016-15 – Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments; • ASU 2016-04 – Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products; • ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities; and • ASU 2014-09 – Revenue from Contracts With Customers (Topic 606) and subsequent related Updates.
Private Share Repurchases	Private Share Repurchases From time to time we enter into private forward repurchase transactions with unrelated third parties to complement our open-market common stock repurchase strategies, to allow us to manage our share repurchases in a manner consistent with our capital plans submitted annually under the Comprehensive Capital Analysis and Review (CCAR) and to provide an economic benefit to the Company. Our payments to the counterparties for these contracts are recorded in permanent equity in the quarter paid and are not subject to re-measurement. The classification of the up-front payments as permanent equity assures that we have appropriate repurchase timing consistent with our capital plans, which contemplate a fixed dollar amount available per quarter for share repurchases pursuant to Federal Reserve Board (FRB) supervisory guidance. In return, the counterparty agrees to deliver a variable number of shares based on a per share discount to the volume-weighted average stock price over the contract period. There are no scenarios where the contracts would not either physically settle in shares or allow us to choose the settlement method. Our total number of outstanding shares of common stock is not reduced until settlement of the private share repurchase contract. We had no unsettled private share repurchase contracts at both March 31, 2018 and March 31, 2017 .
Subsequent Events	Subsequent Events We have evaluated the effects of events that have occurred subsequent to March 31, 2018 , and there have been no material events that would require recognition in our first quarter 2018 consolidated financial statements or disclosure in the Notes to the consolidated financial statements, except that on April 20, 2018, we reached an agreement with the Consumer Financial Protection Bureau (CFPB) and Office of the Comptroller of the Currency (OCC) to pay a total of $1 billion in civil money penalties to resolve matters regarding our compliance risk management program and our past practices involving certain automobile collateral protection insurance policies and certain mortgage interest rate lock extensions (the “CFPB/OCC matter”). This agreement was considered to be a recognizable subsequent event under GAAP and required adjustment to our first quarter 2018 consolidated financial statements. Accordingly, we provided for an additional legal accrual that increased operating losses within noninterest expense by $800 million and, as a result, reduced net income for the quarter ended March 31, 2018, by $800 million , or $0.16 per diluted common share. See Note 13 (Legal Actions) for additional information.
Accounting Standards Update 2017-09 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2017-09 clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the ASU, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The Update is applied to awards modified on or after the adoption date and accordingly, did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2017-07 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2017-07 requires that the service cost component of net benefit cost be reported in the same line item as other compensation costs arising from services rendered by employees during the period, and the other pension cost components (interest cost, expected return on plan assets and amortization of actuarial gains and losses) be presented in the income statement separate from the service cost component. The income statement line item used to present the other pension cost components must be disclosed. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2017-05 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2017-05 provides guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The ASU applies to nonfinancial assets, including real estate (e.g., buildings, land, windmills, solar farms), ships and intellectual property. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2017-01 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2017-01 requires that when substantially all of the fair value of gross assets acquired is concentrated in a single asset (or a group of similar assets), the assets acquired would not represent a business. The Update is applied prospectively and accordingly, did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2016-18 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2016-18 requires that restricted cash and cash equivalents are included with the total cash and cash equivalents in the consolidated statement of cash flows. In addition, the nature of any restrictions will be disclosed in the footnotes to the financial statements. We adopted this change in first quarter 2018. Our retrospective adoption includes changes to our presentation of cash and cash equivalents in our consolidated statement of cash flows to include both cash and due from banks as well as interest-earning deposits with banks. In addition, we had corresponding changes on our consolidated balance sheets.
Accounting Standards Update 2016-16 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2016-16 requires us to recognize the income tax effects of intercompany sales and transfers of assets other than inventory in the period in which the transfer occurs. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2016-15 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice for reporting in the statement of cash flows. We adopted this change in first quarter 2018. The Update did not have a material impact on our consolidated financial statements.
Accounting Standards Update 2016-04 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2016-04 modifies the accounting for certain prepaid card products to require the recognition of breakage. Breakage represents the estimated amount that will not be redeemed by the cardholder for goods or services. We adopted this change in first quarter 2018. Upon adoption, we recorded a cumulative-effect adjustment that increased retained earnings, given estimated breakage, by $20 million .
Accounting Standards Update 2016-01 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2016-01 changes the accounting for certain equity securities to record at fair value with unrealized gains or losses reflected in earnings, as well as improve the disclosures of equity securities and the fair value of financial instruments. The Update also requires that for purposes of disclosing the fair value of financial instruments recorded at amortized cost, including loans and long-term debt, the valuation methodology is based on an exit price notion. We adopted the Update in first quarter 2018 and recorded a cumulative-effect adjustment as of January 1, 2018, that increased retained earnings by $106 million as a result of a transition adjustment to reclassify $118 million in net unrealized gains from other comprehensive income to retained earnings, partially offset by a transition adjustment to decrease retained earnings by $12 million primarily to adjust the carrying value of our auction rate securities from cost to fair value. No transition adjustment was recorded for investments changed to the measurement alternative (described below), which was applied prospectively. As a result of adopting this ASU, our investments in marketable equity securities, including those previously classified as available-for-sale, are accounted for at fair value with unrealized gains or losses reflected in earnings. Additionally, our share of unrealized gains or losses related to marketable equity securities held by our equity method investees are reflected in earnings. Prior to adoption, such unrealized gains and losses were reflected in other comprehensive income. Our investments in nonmarketable equity securities previously accounted for under the cost method of accounting, except for federal bank stock, are now accounted for either at fair value with unrealized gains and losses reflected in earnings or using the measurement alternative. The measurement alternative is similar to the cost method of accounting, except the carrying value is adjusted through earnings for impairment, if any, and changes in observable and orderly transactions in the same or similar investment. We account for substantially all of our private equity securities, previously using the cost method of accounting, now under the measurement alternative. Our auction rate securities portfolio is now accounted for at fair value with unrealized gains or losses reflected in earnings. In connection with our adoption of this Update, we have modified our balance sheet and income statement presentation to report marketable and nonmarketable equity securities and their results separately from debt securities by now reporting all equity securities in a new line labeled “Equity securities” in both the balance sheet and income statement. Additionally we now report loans held for trading purposes in loans held for sale and have reclassified net gains and losses on marketable equity securities used as economic hedges of deferred compensation obligations from “Net gains for trading activities” to “Net gains from equity securities”. All prior periods have been revised to conform to these changes in reporting. Table 1.1 provides a summary of our reporting changes implemented in connection with our adoption of ASU 2016-01. Table 1.1: Summary of Reporting Changes Financial instrument or transaction type As previously reported Revised reporting Balance Sheet Marketable equity securities Trading assets and available for sale investment securities Equity securities (new caption) Nonmarketable equity securities Other assets Equity securities (new caption) Loans held for trading Trading assets Loans held for sale Debt securities held for trading Trading assets Debt securities (formerly “Investment securities”) Income Statement Interest income: Marketable equity securities Trading assets and investment securities Equity securities (new caption) Nonmarketable equity securities Other Equity securities (new caption) Loans held for trading Trading assets Loans held for sale Debt securities held for trading Trading assets Debt securities (formerly “Investment securities”) Noninterest income: Deferred compensation gains (1) Net gains from trading activities Net gains from equity securities (1) Reclassification of net gains and losses on marketable equity securities economically hedging our deferred compensation obligations. Table 1.2 summarizes financial assets and liabilities by form and measurement accounting model. Table 1.2: Accounting Model for Financial Assets and Liabilities Balance sheet caption Measurement model(s) Financial statement Note reference Cash and due from banks Cost N/A Interest-earning deposits with banks Cost N/A Federal funds sold and securities purchased under resale agreements Amortized cost N/A Debt securities: Trading FV-NI (1) Note 4: Trading Activities Available-for-sale FV-OCI (2) Note 5: Debt Securities Held-to-maturity Amortized cost Note 5: Debt Securities Mortgages held for sale FV-NI (1) LOCOM (3) Note 15: Fair Values of Assets and Liabilities Loans held for sale FV-NI (1) Note 15: Fair Values of Assets and Liabilities Loans Amortized cost FV-NI (1) Note 6: Loans and Allowance for Credit Losses Derivative assets and liabilities FV-NI (1) FV-OCI (2) Note 4: Trading Activities Equity securities: Marketable FV-NI (1) Note 4: Trading Activities Note 15: Fair Values of Assets and Liabilities Nonmarketable FV-NI (1) Cost method Equity method MA (4) Note 4: Trading Activities Other assets Amortized cost (5) Note 8: Other Assets Deposits Amortized cost N/A Short-term borrowings Amortized cost N/A Long-term debt Amortized cost N/A (1) FV-NI represents the fair value through net income accounting model. (2) FV-OCI represents the fair value through other comprehensive income accounting model. (3) LOCOM represents the lower of cost or market accounting model. (4) MA represents the measurement alternative accounting model. (5) Other assets are generally carried at amortized cost, except for bank-owned life insurance which is carried at cash surrender value.
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Accounting Standards Adopted in 2018	ASU 2014-09 modifies the guidance used to recognize revenue from contracts with customers for transfers of goods or services and transfers of non-financial assets, unless those contracts are within the scope of other guidance. Upon a modified retrospective adoption, we recorded a cumulative-effect adjustment that decreased retained earnings by $32 million , due to changes in the timing of revenue for corporate trust services that are provided over the life of the associated trust. In addition, we changed the presentation of some costs such that underwriting expenses of our broker-dealer business that were previously netted against revenue are now included in noninterest expense, and card payment network charges that were previously included in noninterest expense are now netted against card fee revenue.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Significant noncash activities are presented in Table 1.3. Table 1.3: Supplemental Cash Flow Information Quarter ended March 31, (in millions) 2018 2017 Trading debt securities retained from securitization of MHFS $ 8,776 20,929 Transfers from loans to MHFS 1,297 1,657 Transfers from loans to LHFS 1,973 479 Transfers from available-for-sale debt securities to held-to-maturity debt securities 4,451 9,897

Cash, Loan and Dividend Restr34

Cash, Loan and Dividend Restrictions (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Nature of Restrictions on Cash Equivalents [Table Text Block]	Table 3.1 provides a summary of restrictions on cash equivalents in addition to the FRB reserve cash balance requirements . Table 3.1: Nature of Restrictions on Cash Equivalents (in millions) Mar 31, Dec 31, Average required reserve balance for FRB (1) $ 12,025 12,306 Reserve balance for non-U.S. central banks 427 617 Segregated for benefit of brokerage customers under federal and other brokerage regulations 574 666 Related to consolidated variable interest entities (VIEs) that can only be used to settle liabilities of VIEs 119 487 (1) FRB required reserve balance represents average for first quarter 2018 and for the year ended December 31, 2017 .

Trading Activities (Tables)

Trading Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Trading Activities [Abstract]
Trading Assets and Liabilities	Table 4.1 presents a summary of our trading assets and liabilities measured at fair value through earnings . Table 4.1: Trading Assets and Liabilities Mar 31, Dec 31, (in millions) 2018 2017 Trading assets: Debt securities $ 59,866 57,624 Equity securities 25,327 30,004 Loans held for sale 1,695 1,023 Gross trading derivative assets 30,644 31,340 Netting (1) (20,112 ) (19,629 ) Total trading derivative assets 10,532 11,711 Total trading assets 97,420 100,362 Trading liabilities: Short sale 23,303 18,472 Gross trading derivative liabilities 29,717 31,386 Netting (1) (22,569 ) (23,062 ) Total trading derivative liabilities 7,148 8,324 Total trading liabilities $ 30,451 26,796 (1) Represents balance sheet netting for trading derivative asset and liability balances, and trading portfolio level counterparty valuation adjustments.
Net Interest and Net Gains (Losses) on Trading Activities	Table 4.2 provides a summary of the net interest income earned from trading securities, and net gains and losses due to the realized and unrealized gains and losses from trading activities. Table 4.2: Net Interest Income and Net Gains (Losses) on Trading Activities Quarter ended March 31, (in millions) 2018 2017 Interest income (1): Debt securities $ 631 513 Equity securities 141 114 Loans held for sale 8 9 Total interest income 780 636 Less: Interest expense (2) 128 93 Net interest income 652 543 Net gains (losses) from trading activities: Debt securities (499 ) 149 Equity securities (469 ) 927 Loans held for sale 8 24 Derivatives (3) 1,203 (828 ) Total net gains from trading activities (4) 243 272 Total trading-related net interest and noninterest income $ 895 815 (1) Represents interest and dividend income earned on trading securities. (2) Represents interest and dividend expense incurred on trading securities we have sold but have not yet purchased. (3) Excludes economic hedging of mortgage banking and asset/liability management activities, for which hedge results (realized and unrealized) are reported with the respective hedged activities. (4) Represents realized gains (losses) from our trading activities and unrealized gains (losses) due to changes in fair value of our trading positions, attributable to the type of asset or liability.

AFS and HTM Debt Securities (Ta

AFS and HTM Debt Securities (Tables)	3 Months Ended
	Mar. 31, 2018
AFS and HTM Debt Securities [Abstract]
AFS and HTM Debt Securities, Amortized Cost and Fair Value, by Category	Table 5.1 provides the amortized cost and fair value by major categories of available-for-sale debt securities, which are carried at fair value, and held-to-maturity debt securities, which are carried at amortized cost. The net unrealized gains (losses) for available-for-sale debt securities are reported on an after-tax basis as a component of cumulative OCI. Information on debt securities held for trading is included in Note 4 (Trading Activities) to Financial Statements in this Report. Table 5.1: Amortized Cost and Fair Value (in millions) Amortized Cost Gross unrealized gains Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ 6,426 1 (148 ) 6,279 Securities of U.S. states and political subdivisions 49,117 939 (413 ) 49,643 Mortgage-backed securities: Federal agencies 160,216 431 (3,833 ) 156,814 Residential 4,233 243 (2 ) 4,474 Commercial 4,722 78 (10 ) 4,790 Total mortgage-backed securities 169,171 752 (3,845 ) 166,078 Corporate debt securities 6,918 299 (34 ) 7,183 Collateralized loan and other debt obligations (1) 36,360 394 (2 ) 36,752 Other (2) 5,596 131 (6 ) 5,721 Total available-for-sale debt securities 273,588 2,516 (4,448 ) 271,656 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies 44,727 — (548 ) 44,179 Securities of U.S. states and political subdivisions 6,307 26 (102 ) 6,231 Federal agency and other mortgage-backed securities (3) 89,748 35 (2,537 ) 87,246 Collateralized loan obligations 567 3 — 570 Other (2) 97 — — 97 Total held-to-maturity debt securities 141,446 64 (3,187 ) 138,323 Total $ 415,034 2,580 (7,635 ) 409,979 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ 6,425 2 (108 ) 6,319 Securities of U.S. states and political subdivisions 50,733 1,032 (439 ) 51,326 Mortgage-backed securities: Federal agencies 160,561 930 (1,272 ) 160,219 Residential 4,356 254 (2 ) 4,608 Commercial 4,487 80 (2 ) 4,565 Total mortgage-backed securities 169,404 1,264 (1,276 ) 169,392 Corporate debt securities 7,343 363 (40 ) 7,666 Collateralized loan and other debt obligations (1) 35,675 384 (3 ) 36,056 Other (2) 5,516 137 (5 ) 5,648 Total available-for-sale debt securities 275,096 3,182 (1,871 ) 276,407 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies 44,720 189 (103 ) 44,806 Securities of U.S. states and political subdivisions 6,313 84 (43 ) 6,354 Federal agency and other mortgage-backed securities (3) 87,527 201 (682 ) 87,046 Collateralized loan obligations 661 4 — 665 Other (2) 114 — — 114 Total held-to-maturity debt securities 139,335 478 (828 ) 138,985 Total $ 414,431 3,660 (2,699 ) 415,392 (1) Available-for-sale debt securities include collateralized debt obligations (CDOs) with a cost basis and fair value of $869 million and $1.0 billion , respectively, at March 31, 2018 , and $887 million and $1.0 billion , respectively, at December 31, 2017 . (2) The “Other” category of available-for-sale debt securities largely includes asset-backed securities collateralized by student loans. Included in the “Other” category of held-to-maturity debt securities are asset-backed securities collateralized by automobile leases or loans and cash with a cost basis and fair value of $97 million each at March 31, 2018 , and $114 million each at December 31, 2017 . (3) Predominantly consists of federal agency mortgage-backed securities at both March 31, 2018 and December 31, 2017 .
AFS and HTM Debt Securities, Gross Unrealized Losses and Fair Value, Over and Under 12 Months	Table 5.2 shows the gross unrealized losses and fair value of available-for-sale and held-to-maturity debt securities by length of time those individual securities in each category have been in a continuous loss position. Debt securities on which we have taken credit-related OTTI write-downs are categorized as being “less than 12 months” or “12 months or more” in a continuous loss position based on the point in time that the fair value declined to below the cost basis and not the period of time since the credit-related OTTI write-down. Table 5.2: Gross Unrealized Losses and Fair Value Less than 12 months 12 months or more Total (in millions) Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (56 ) 4,037 (92 ) 2,203 (148 ) 6,240 Securities of U.S. states and political subdivisions (26 ) 5,292 (387 ) 10,526 (413 ) 15,818 Mortgage-backed securities: Federal agencies (2,211 ) 103,361 (1,622 ) 38,197 (3,833 ) 141,558 Residential (1 ) 161 (1 ) 53 (2 ) 214 Commercial (9 ) 430 (1 ) 109 (10 ) 539 Total mortgage-backed securities (2,221 ) 103,952 (1,624 ) 38,359 (3,845 ) 142,311 Corporate debt securities (10 ) 664 (24 ) 395 (34 ) 1,059 Collateralized loan and other debt obligations (1 ) 1,476 (1 ) 162 (2 ) 1,638 Other (1 ) 169 (5 ) 323 (6 ) 492 Total available-for-sale debt securities (2,315 ) 115,590 (2,133 ) 51,968 (4,448 ) 167,558 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (494 ) 42,710 (54 ) 1,469 (548 ) 44,179 Securities of U.S. states and political subdivisions (36 ) 2,967 (66 ) 1,653 (102 ) 4,620 Federal agency and other mortgage-backed securities (1,411 ) 58,073 (1,126 ) 26,991 (2,537 ) 85,064 Collateralized loan obligations — — — — — — Other — — — — — — Total held-to-maturity debt securities (1,941 ) 103,750 (1,246 ) 30,113 (3,187 ) 133,863 Total $ (4,256 ) 219,340 (3,379 ) 82,081 (7,635 ) 301,421 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (27 ) 4,065 (81 ) 2,209 (108 ) 6,274 Securities of U.S. states and political subdivisions (17 ) 6,179 (422 ) 11,766 (439 ) 17,945 Mortgage-backed securities: Federal agencies (243 ) 52,559 (1,029 ) 44,691 (1,272 ) 97,250 Residential (1 ) 47 (1 ) 58 (2 ) 105 Commercial (1 ) 101 (1 ) 133 (2 ) 234 Total mortgage-backed securities (245 ) 52,707 (1,031 ) 44,882 (1,276 ) 97,589 Corporate debt securities (4 ) 239 (36 ) 503 (40 ) 742 Collateralized loan and other debt obligations (1 ) 373 (2 ) 146 (3 ) 519 Other (1 ) 37 (4 ) 483 (5 ) 520 Total available-for-sale debt securities (295 ) 63,600 (1,576 ) 59,989 (1,871 ) 123,589 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (69 ) 11,255 (34 ) 1,490 (103 ) 12,745 Securities of U.S. states and political subdivisions (5 ) 500 (38 ) 1,683 (43 ) 2,183 Federal agency and other mortgage-backed securities (198 ) 29,713 (484 ) 28,244 (682 ) 57,957 Collateralized loan obligations — — — — — — Other — — — — — — Total held-to-maturity debt securities (272 ) 41,468 (556 ) 31,417 (828 ) 72,885 Total $ (567 ) 105,068 (2,132 ) 91,406 (2,699 ) 196,474
AFS and HTM Debt Securities, Gross Unrealized Losses and Fair Value, by Investment Grade	Table 5.3 shows the gross unrealized losses and fair value of the available-for-sale and held-to-maturity debt securities by those rated investment grade and those rated less than investment grade, according to their lowest credit rating by Standard & Poor’s Rating Services (S&P) or Moody’s Investors Service (Moody’s). Credit ratings express opinions about the credit quality of a debt security. Debt securities rated investment grade, that is those rated BBB- or higher by S&P or Baa3 or higher by Moody’s, are generally considered by the rating agencies and market participants to be low credit risk. Conversely, debt securities rated below investment grade, labeled as “speculative grade” by the rating agencies, are considered to be distinctively higher credit risk than investment grade debt securities. We have also included debt securities not rated by S&P or Moody’s in the table below based on our internal credit grade of the debt securities (used for credit risk management purposes) equivalent to the credit rating assigned by major credit agencies. The unrealized losses and fair value of unrated debt securities categorized as investment grade based on internal credit grades were $25 million and $5.0 billion , respectively, at March 31, 2018 , and $32 million and $6.9 billion , respectively, at December 31, 2017 . If an internal credit grade was not assigned, we categorized the debt security as non-investment grade. Table 5.3: Gross Unrealized Losses and Fair Value by Investment Grade Investment grade Non-investment grade (in millions) Gross unrealized losses Fair value Gross unrealized losses Fair value March 31, 2018 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (148 ) 6,240 — — Securities of U.S. states and political subdivisions (392 ) 15,551 (21 ) 267 Mortgage-backed securities: Federal agencies (3,833 ) 141,558 — — Residential (1 ) 146 (1 ) 68 Commercial (2 ) 379 (8 ) 160 Total mortgage-backed securities (3,836 ) 142,083 (9 ) 228 Corporate debt securities (10 ) 370 (24 ) 689 Collateralized loan and other debt obligations (2 ) 1,638 — — Other (4 ) 443 (2 ) 49 Total available-for-sale debt securities (4,392 ) 166,325 (56 ) 1,233 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (548 ) 44,179 — — Securities of U.S. states and political subdivisions (102 ) 4,620 — — Federal agency and other mortgage-backed securities (2,529 ) 84,695 (8 ) 369 Collateralized loan obligations — — — — Other — — — — Total held-to-maturity debt securities (3,179 ) 133,494 (8 ) 369 Total $ (7,571 ) 299,819 (64 ) 1,602 December 31, 2017 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies $ (108 ) 6,274 — — Securities of U.S. states and political subdivisions (412 ) 17,763 (27 ) 182 Mortgage-backed securities: Federal agencies (1,272 ) 97,250 — — Residential (1 ) 42 (1 ) 63 Commercial (1 ) 183 (1 ) 51 Total mortgage-backed securities (1,274 ) 97,475 (2 ) 114 Corporate debt securities (13 ) 304 (27 ) 438 Collateralized loan and other debt obligations (3 ) 519 — — Other (2 ) 469 (3 ) 51 Total available-for-sale debt securities (1,812 ) 122,804 (59 ) 785 Held-to-maturity debt securities: Securities of U.S. Treasury and federal agencies (103 ) 12,745 — — Securities of U.S. states and political subdivisions (43 ) 2,183 — — Federal agency and other mortgage-backed securities (680 ) 57,789 (2 ) 168 Collateralized loan obligations — — — — Other — — — — Total held-to-maturity debt securities (826 ) 72,717 (2 ) 168 Total $ (2,638 ) 195,521 (61 ) 953
AFS and HTM Debt Securities Contractual Maturities	Table 5.4 shows the remaining contractual maturities and contractual weighted-average yields (taxable-equivalent basis) of available-for-sale debt securities. The remaining contractual principal maturities for MBS do not consider prepayments. Remaining expected maturities will differ from contractual maturities because borrowers may have the right to prepay obligations before the underlying mortgages mature. Table 5.4: Contractual Maturities Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Yield Amount Yield Amount Yield Amount Yield Amount Yield March 31, 2018 Available-for-sale debt securities (1): Fair value: Securities of U.S. Treasury and federal agencies $ 6,279 1.59 % $ 117 1.60 % $ 6,114 1.59 % $ 48 1.90 % $ — — % Securities of U.S. states and political subdivisions 49,643 4.75 2,089 2.70 8,343 3.05 4,293 3.16 34,918 5.48 Mortgage-backed securities: Federal agencies 156,814 3.29 7 2.06 194 3.29 5,139 2.81 151,474 3.30 Residential 4,474 3.61 — — 23 5.70 8 2.36 4,443 3.60 Commercial 4,790 3.45 — — — — 219 3.10 4,571 3.46 Total mortgage-backed securities 166,078 3.30 7 2.06 217 3.54 5,366 2.83 160,488 3.32 Corporate debt securities 7,183 5.11 335 5.08 2,658 5.48 3,280 4.73 910 5.38 Collateralized loan and other debt obligations 36,752 3.29 — — 37 2.09 14,788 3.27 21,927 3.31 Other 5,721 2.85 66 4.26 582 3.06 1,480 2.34 3,593 3.00 Total available-for-sale debt securities at fair value $ 271,656 3.56 % $ 2,614 2.98 % $ 17,951 2.92 % $ 29,255 3.28 % $ 221,836 3.66 % December 31, 2017 Available-for-sale debt securities (1): ` Fair value: Securities of U.S. Treasury and federal agencies $ 6,319 1.59 % $ 81 1.37 % $ 6,189 1.59 % $ 49 1.89 % $ — — % Securities of U.S. states and political subdivisions 51,326 5.88 2,380 3.47 9,484 3.42 2,276 4.63 37,186 6.75 Mortgage-backed securities: Federal agencies 160,219 3.27 15 2.03 210 3.08 5,534 2.82 154,460 3.28 Residential 4,608 3.52 — — 24 5.67 11 2.46 4,573 3.51 Commercial 4,565 3.45 — — — — 166 2.69 4,399 3.48 Total mortgage-backed securities 169,392 3.28 15 2.03 234 3.35 5,711 2.82 163,432 3.30 Corporate debt securities 7,666 5.12 443 5.54 2,738 5.56 3,549 4.70 936 5.26 Collateralized loan and other debt obligations 36,056 2.98 — — 50 1.68 15,008 2.96 20,998 3.00 Other 5,648 2.46 71 3.56 463 2.72 1,466 2.13 3,648 2.53 Total available-for-sale debt securities at fair value $ 276,407 3.72 % $ 2,990 3.70 % $ 19,158 3.11 % $ 28,059 3.24 % $ 226,200 3.83 % (1) Weighted-average yields displayed by maturity bucket are weighted based on fair value and predominantly represent contractual coupon rates without effect for any related hedging derivatives. Table 5.5 shows the amortized cost and weighted-average yields of held-to-maturity debt securities by contractual maturity. Table 5.5: Amortized Cost by Contractual Maturity Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Yield Amount Yield Amount Yield Amount Yield Amount Yield March 31, 2018 Held-to-maturity debt securities (1): Amortized cost: Securities of U.S. Treasury and federal agencies $ 44,727 2.12 % $ — — % $ 32,336 2.04 % $ 12,391 2.32 % $ — — % Securities of U.S. states and political subdivisions 6,307 4.93 — — 50 5.88 793 5.16 5,464 4.89 Federal agency and other mortgage-backed securities 89,748 3.10 — — 15 2.70 11 2.62 89,722 3.10 Collateralized loan obligations 567 3.22 — — — — 567 3.22 — — Other 97 1.83 — — 97 1.83 — — — — Total held-to-maturity debt securities at amortized cost $ 141,446 2.87 % $ — — % $ 32,498 2.05 % $ 13,762 2.52 % $ 95,186 3.20 % December 31, 2017 Held-to-maturity debt securities (1): Amortized cost: Securities of U.S. Treasury and federal agencies $ 44,720 2.12 % $ — — % $ 32,330 2.04 % $ 12,390 2.32 % $ — — % Securities of U.S. states and political subdivisions 6,313 6.02 — — 50 7.18 695 6.31 5,568 5.98 Federal agency and other mortgage-backed securities 87,527 3.11 — — 15 2.81 11 2.49 87,501 3.11 Collateralized loan obligations 661 2.86 — — — — 661 2.86 — — Other 114 1.83 — — 114 1.83 — — — — Total held-to-maturity debt securities at amortized cost $ 139,335 2.92 % $ — — % $ 32,509 2.05 % $ 13,757 2.55 % $ 93,069 3.28 % (1) Weighted-average yields displayed by maturity bucket are weighted based on amortized cost and predominantly represent contractual coupon rates. Table 5.6 shows the fair value of held-to-maturity debt securities by contractual maturity. Table 5.6: Fair Value by Contractual Maturity Remaining contractual maturity Total Within one year After one year through five years After five years through ten years After ten years (in millions) amount Amount Amount Amount Amount March 31, 2018 Held-to-maturity debt securities: Fair value: Securities of U.S. Treasury and federal agencies $ 44,179 — 32,014 12,165 — Securities of U.S. states and political subdivisions 6,231 — 49 788 5,394 Federal agency and other mortgage-backed securities 87,246 — 15 11 87,220 Collateralized loan obligations 570 — — 570 — Other 97 — 97 — — Total held-to-maturity debt securities at fair value $ 138,323 — 32,175 13,534 92,614 December 31, 2017 Held-to-maturity debt securities: Fair value: Securities of U.S. Treasury and federal agencies $ 44,806 — 32,388 12,418 — Securities of U.S. states and political subdivisions 6,354 — 49 701 5,604 Federal agency and other mortgage-backed securities 87,046 — 15 11 87,020 Collateralized loan obligations 665 — — 665 — Other 114 — 114 — — Total held-to-maturity debt securities at fair value $ 138,985 — 32,566 13,795 92,624
AFS and HTM Debt Securities, Realized Gains and Losses	Table 5.7 shows the gross realized gains and losses on sales and OTTI write-downs related to available-for-sale debt securities. Table 5.7: Realized Gains and Losses Quarter ended March 31, (in millions) 2018 2017 Gross realized gains $ 21 124 Gross realized losses (10 ) (36 ) OTTI write-downs (10 ) (52 ) Net realized gains from available-for-sale debt securities $ 1 36
AFS and HTM Debt Securities, Other Than Temporary Impairment	Table 5.8 shows the detail of total OTTI write-downs included in earnings for available-for-sale debt securities. There were no OTTI write-downs on held-to-maturity debt securities during first quarter 2018 and 2017 . Table 5.8: Detail of OTTI Write-downs Quarter ended March 31, (in millions) 2018 2017 Debt securities OTTI write-downs included in earnings: Securities of U.S. states and political subdivisions $ 2 8 Mortgage-backed securities: Residential 1 3 Commercial 7 25 Corporate debt securities — 16 Total debt securities OTTI write-downs included in earnings $ 10 52
AFS and HTM Debt Securities Other Than Temporary Impairment Included in Earnings	Table 5.9 shows the detail of OTTI write-downs on available-for-sale debt securities included in earnings and the related changes in OCI for the same securities. Table 5.9: OTTI Write-downs Included in Earnings and the Related Changes in OCI Quarter ended March 31, (in millions) 2018 2017 OTTI on debt securities Recorded as part of gross realized losses: Credit-related OTTI $ 9 52 Intent-to-sell OTTI 1 — Total recorded as part of gross realized losses 10 52 Changes to OCI for losses (reversal of losses) in non-credit-related OTTI (1): Securities of U.S. states and political subdivisions (2 ) (5 ) Residential mortgage-backed securities (1 ) 3 Commercial mortgage-backed securities 10 (7 ) Total changes to OCI for non-credit-related OTTI 7 (9 ) Total OTTI losses recorded on debt securities $ 17 43 (1) Represents amounts recorded to OCI for impairment of debt securities, due to factors other than credit, that have also had credit-related OTTI write-downs during the period. Increases represent initial or subsequent non-credit-related OTTI on debt securities. Decreases represent partial to full reversal of impairment due to recoveries in the fair value of debt securities due to non-credit factors.
Rollforward of Credit Loss Component Of Credit-Impaired AFS and HTM Debt Securities	Table 5.10 presents a rollforward of the OTTI credit loss that has been recognized in earnings as a write-down of available-for-sale debt securities we still own (referred to as “credit-impaired” debt securities) and do not intend to sell. Recognized credit loss represents the difference between the present value of expected future cash flows discounted using the security’s current effective interest rate and the amortized cost basis of the security prior to considering credit loss. Table 5.10: Rollforward of OTTI Credit Loss Quarter ended March 31, (in millions) 2018 2017 Credit loss recognized, beginning of period $ 742 1,043 Additions: For securities with initial credit impairments — 6 For securities with previous credit impairments 9 46 Total additions 9 52 Reductions: For securities sold, matured, or intended/required to be sold (101 ) (7 ) For recoveries of previous credit impairments (1) (1 ) (2 ) Total reductions (102 ) (9 ) Credit loss recognized, end of period $ 649 1,086 (1) Recoveries of previous credit impairments result from increases in expected cash flows subsequent to credit loss recognition. Such recoveries are reflected prospectively as interest yield adjustments using the effective interest method.

Loans and Allowance for Credi37

Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans and Allowance for Credit Losses, Loans Outstanding	Table 6.1 presents total loans outstanding by portfolio segment and class of financing receivable. Outstanding balances include a total net reduction of $3.2 billion and $3.9 billion at March 31, 2018 , and December 31, 2017 , respectively, for unearned income, net deferred loan fees, and unamortized discounts and premiums. Table 6.1: Loans Outstanding (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 334,678 333,125 Real estate mortgage 125,543 126,599 Real estate construction 23,882 24,279 Lease financing 19,293 19,385 Total commercial 503,396 503,388 Consumer: Real estate 1-4 family first mortgage 282,658 284,054 Real estate 1-4 family junior lien mortgage 37,920 39,713 Credit card 36,103 37,976 Automobile 49,554 53,371 Other revolving credit and installment 37,677 38,268 Total consumer 443,912 453,382 Total loans $ 947,308 956,770 Our foreign loans are reported by respective class of financing receivable in the table above. Substantially all of our foreign loan portfolio is commercial loans. Loans are classified as foreign primarily based on whether the borrower’s primary address is outside of the United States. Table 6.2 presents total commercial foreign loans outstanding by class of financing receivable. Table 6.2: Commercial Foreign Loans Outstanding (in millions) Mar 31, Dec 31, Commercial foreign loans: Commercial and industrial $ 59,696 60,106 Real estate mortgage 8,082 8,033 Real estate construction 668 655 Lease financing 1,077 1,126 Total commercial foreign loans $ 69,523 69,920
Loans and Allowance for Credit Losses, Significant Activity	Table 6.3 summarizes the proceeds paid or received for purchases and sales of loans and transfers from loans held for investment to mortgages/loans held for sale at lower of cost or fair value. This loan activity also includes participating interests, whereby we receive or transfer a portion of a loan. The table excludes PCI loans and loans for which we have elected the fair value option, including loans originated for sale because their loan activity normally does not impact the allowance for credit losses. Table 6.3: Loan Purchases, Sales, and Transfers 2018 2017 (in millions) Commercial Consumer (1) Total Commercial Consumer (1) Total Quarter ended March 31, Purchases $ 256 — 256 1,159 2 1,161 Sales (460 ) — (460 ) (287 ) (62 ) (349 ) Transfers to MHFS/LHFS (420 ) (1,553 ) (1,973 ) (479 ) — (479 ) (1) Excludes activity in government insured/guaranteed real estate 1-4 family first mortgage loans. As servicer, we are able to buy delinquent insured/guaranteed loans out of the Government National Mortgage Association (GNMA) pools, and manage and/or resell them in accordance with applicable requirements. These loans are predominantly insured by the Federal Housing Administration (FHA) or guaranteed by the Department of Veterans Affairs (VA). Accordingly, these loans have limited impact on the allowance for loan losses.
Loans and Allowance for Credit Losses, Commitments to Lend	The contractual amount of our unfunded credit commitments, including unissued standby and commercial letters of credit, is summarized by portfolio segment and class of financing receivable in Table 6.4 . The table excludes the issued standby and commercial letters of credit and temporary advance arrangements described above. Table 6.4: Unfunded Credit Commitments (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 325,091 326,626 Real estate mortgage 7,233 7,485 Real estate construction 15,612 16,621 Lease financing — — Total commercial 347,936 350,732 Consumer: Real estate 1-4 family first mortgage 32,220 29,876 Real estate 1-4 family junior lien mortgage 38,817 38,897 Credit card 111,427 108,465 Other revolving credit and installment 27,635 27,541 Total consumer 210,099 204,779 Total unfunded credit commitments $ 558,035 555,511
Loans and Allowance for Credit Losses, Allowance for Credit Losses	Table 6.5 presents the allowance for credit losses, which consists of the allowance for loan losses and the allowance for unfunded credit commitments. Table 6.5: Allowance for Credit Losses Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 11,960 12,540 Provision for credit losses 191 605 Interest income on certain impaired loans (1) (43 ) (48 ) Loan charge-offs: Commercial: Commercial and industrial (164 ) (253 ) Real estate mortgage (2 ) (5 ) Real estate construction — — Lease financing (17 ) (7 ) Total commercial (183 ) (265 ) Consumer: Real estate 1-4 family first mortgage (41 ) (69 ) Real estate 1-4 family junior lien mortgage (47 ) (93 ) Credit card (405 ) (367 ) Automobile (300 ) (255 ) Other revolving credit and installment (180 ) (189 ) Total consumer (973 ) (973 ) Total loan charge-offs (1,156 ) (1,238 ) Loan recoveries: Commercial: Commercial and industrial 79 82 Real estate mortgage 17 30 Real estate construction 4 8 Lease financing 5 2 Total commercial 105 122 Consumer: Real estate 1-4 family first mortgage 59 62 Real estate 1-4 family junior lien mortgage 55 70 Credit card 73 58 Automobile 92 88 Other revolving credit and installment 31 33 Total consumer 310 311 Total loan recoveries 415 433 Net loan charge-offs (741 ) (805 ) Other (54 ) (5 ) Balance, end of period $ 11,313 12,287 Components: Allowance for loan losses $ 10,373 11,168 Allowance for unfunded credit commitments 940 1,119 Allowance for credit losses $ 11,313 12,287 Net loan charge-offs (annualized) as a percentage of average total loans 0.32 % 0.34 Allowance for loan losses as a percentage of total loans 1.10 1.17 Allowance for credit losses as a percentage of total loans 1.19 1.28 (1) Certain impaired loans with an allowance calculated by discounting expected cash flows using the loan’s effective interest rate over the remaining life of the loan recognize changes in allowance attributable to the passage of time as interest income.
Loans and Allowance for Credit Losses, Allowance Activity by Portfolio Segment	Table 6.6 summarizes the activity in the allowance for credit losses by our commercial and consumer portfolio segments. Table 6.6: Allowance Activity by Portfolio Segment 2018 2017 (in millions) Commercial Consumer Total Commercial Consumer Total Quarter ended March 31, Balance, beginning of period $ 6,632 5,328 11,960 7,394 5,146 12,540 Provision (reversal of provision) for credit losses 169 22 191 (89 ) 694 605 Interest income on certain impaired loans (11 ) (32 ) (43 ) (15 ) (33 ) (48 ) Loan charge-offs (183 ) (973 ) (1,156 ) (265 ) (973 ) (1,238 ) Loan recoveries 105 310 415 122 311 433 Net loan charge-offs (78 ) (663 ) (741 ) (143 ) (662 ) (805 ) Other (4 ) (50 ) (54 ) (5 ) — (5 ) Balance, end of period $ 6,708 4,605 11,313 7,142 5,145 12,287
Loans and Allowance for Credit Losses, by Impairment Methodology	Table 6.7 disaggregates our allowance for credit losses and recorded investment in loans by impairment methodology. Table 6.7: Allowance by Impairment Methodology Allowance for credit losses Recorded investment in loans (in millions) Commercial Consumer Total Commercial Consumer Total March 31, 2018 Collectively evaluated (1) $ 6,029 3,580 9,609 499,578 418,877 918,455 Individually evaluated (2) 669 1,025 1,694 3,743 14,401 18,144 PCI (3) 10 — 10 75 10,634 10,709 Total $ 6,708 4,605 11,313 503,396 443,912 947,308 December 31, 2017 Collectively evaluated (1) $ 5,927 4,143 10,070 499,342 425,919 925,261 Individually evaluated (2) 705 1,185 1,890 3,960 14,714 18,674 PCI (3) — — — 86 12,749 12,835 Total $ 6,632 5,328 11,960 503,388 453,382 956,770 (1) Represents loans collectively evaluated for impairment in accordance with Accounting Standards Codification (ASC) 450-20, Loss Contingencies (formerly FAS 5), and pursuant to amendments by ASU 2010-20 regarding allowance for non-impaired loans. (2) Represents loans individually evaluated for impairment in accordance with ASC 310-10, Receivables (formerly FAS 114), and pursuant to amendments by ASU 2010-20 regarding allowance for impaired loans. (3) Represents the allowance and related loan carrying value determined in accordance with ASC 310-30 , Receivables – Loans and Debt Securities Acquired with Deteriorated Credit Quality (formerly SOP 03-3) and pursuant to amendments by ASU 2010-20 regarding allowance for PCI loans.
Loans and Allowance for Credit Losses, Loans by Credit Quality Indicator	Table 6.8 provides a breakdown of outstanding commercial loans by risk category. Of the $16.3 billion in criticized commercial and industrial loans and $4.6 billion in criticized commercial real estate (CRE) loans at March 31, 2018 , $1.5 billion and $800 million , respectively, have been placed on nonaccrual status and written down to net realizable collateral value. Table 6.8: Commercial Loans by Risk Category (in millions) Commercial and industrial Real estate mortgage Real estate construction Lease financing Total March 31, 2018 By risk category: Pass $ 318,334 121,151 23,647 18,120 481,252 Criticized 16,269 4,392 235 1,173 22,069 Total commercial loans (excluding PCI) 334,603 125,543 23,882 19,293 503,321 Total commercial PCI loans (carrying value) 75 — — — 75 Total commercial loans $ 334,678 125,543 23,882 19,293 503,396 December 31, 2017 By risk category: Pass $ 316,431 122,312 23,981 18,162 480,886 Criticized 16,608 4,287 298 1,223 22,416 Total commercial loans (excluding PCI) 333,039 126,599 24,279 19,385 503,302 Total commercial PCI loans (carrying value) 86 — — — 86 Total commercial loans $ 333,125 126,599 24,279 19,385 503,388
Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial	Table 6.9 provides past due information for commercial loans, which we monitor as part of our credit risk management practices. Table 6.9: Commercial Loans by Delinquency Status (in millions) Commercial and industrial Real estate mortgage Real estate construction Lease financing Total March 31, 2018 By delinquency status: Current-29 days past due (DPD) and still accruing $ 332,432 124,148 23,706 19,077 499,363 30-89 DPD and still accruing 615 617 130 123 1,485 90+ DPD and still accruing 40 23 1 — 64 Nonaccrual loans 1,516 755 45 93 2,409 Total commercial loans (excluding PCI) 334,603 125,543 23,882 19,293 503,321 Total commercial PCI loans (carrying value) 75 — — — 75 Total commercial loans $ 334,678 125,543 23,882 19,293 503,396 December 31, 2017 By delinquency status: Current-29 DPD and still accruing $ 330,319 125,642 24,107 19,148 499,216 30-89 DPD and still accruing 795 306 135 161 1,397 90+ DPD and still accruing 26 23 — — 49 Nonaccrual loans 1,899 628 37 76 2,640 Total commercial loans (excluding PCI) 333,039 126,599 24,279 19,385 503,302 Total commercial PCI loans (carrying value) 86 — — — 86 Total commercial loans $ 333,125 126,599 24,279 19,385 503,388
Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer	Table 6.10 provides the outstanding balances of our consumer portfolio by delinquency status. Table 6.10: Consumer Loans by Delinquency Status (in millions) Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Credit card Automobile Other revolving credit and installment Total March 31, 2018 By delinquency status: Current-29 DPD $ 253,542 37,046 35,198 48,136 37,320 411,242 30-59 DPD 1,449 273 244 991 135 3,092 60-89 DPD 589 141 188 306 84 1,308 90-119 DPD 290 93 167 116 78 744 120-179 DPD 279 104 304 4 27 718 180+ DPD 1,105 238 2 1 33 1,379 Government insured/guaranteed loans (1) 14,795 — — — — 14,795 Total consumer loans (excluding PCI) 272,049 37,895 36,103 49,554 37,677 433,278 Total consumer PCI loans (carrying value) 10,609 25 — — — 10,634 Total consumer loans $ 282,658 37,920 36,103 49,554 37,677 443,912 December 31, 2017 By delinquency status: Current-29 DPD $ 251,786 38,746 36,996 51,445 37,885 416,858 30-59 DPD 1,893 336 287 1,385 155 4,056 60-89 DPD 742 163 201 392 93 1,591 90-119 DPD 369 103 192 146 80 890 120-179 DPD 308 95 298 3 30 734 180+ DPD 1,091 243 2 — 25 1,361 Government insured/guaranteed loans (1) 15,143 — — — — 15,143 Total consumer loans (excluding PCI) 271,332 39,686 37,976 53,371 38,268 440,633 Total consumer PCI loans (carrying value) 12,722 27 — — — 12,749 Total consumer loans $ 284,054 39,713 37,976 53,371 38,268 453,382 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. Loans insured/guaranteed by the FHA/VA and 90+ DPD totaled $9.4 billion at March 31, 2018 , compared with $10.5 billion at December 31, 2017 .
Loans and Allowance for Credit Losses, Loans by FICO Score, Consumer	Table 6.11 provides a breakdown of our consumer portfolio by FICO. Most of the scored consumer portfolio has an updated FICO of 680 and above, reflecting a strong current borrower credit profile. FICO is not available for certain loan types, or may not be required if we deem it unnecessary due to strong collateral and other borrower attributes. Substantially all loans not requiring a FICO score are securities-based loans originated through retail brokerage, and totaled $8.7 billion at March 31, 2018 , and $8.5 billion at December 31, 2017 . Table 6.11: Consumer Loans by FICO (in millions) Real estate 1-4 family first mortgage (1) Real estate 1-4 family junior lien mortgage (1) Credit card Automobile Other revolving credit and installment Total March 31, 2018 By FICO: < 600 $ 4,674 1,601 3,407 8,546 828 19,056 600-639 3,405 1,223 2,915 5,161 862 13,566 640-679 6,717 2,274 5,352 6,936 1,906 23,185 680-719 14,313 4,604 7,304 8,049 3,397 37,667 720-759 27,119 6,007 7,808 7,215 4,947 53,096 760-799 54,227 6,918 6,065 6,036 6,223 79,469 800+ 141,351 14,506 2,922 7,399 8,252 174,430 No FICO available 5,448 762 330 212 2,525 9,277 FICO not required — — — — 8,737 8,737 Government insured/guaranteed loans (1) 14,795 — — — — 14,795 Total consumer loans (excluding PCI) 272,049 37,895 36,103 49,554 37,677 433,278 Total consumer PCI loans (carrying value) 10,609 25 — — — 10,634 Total consumer loans $ 282,658 37,920 36,103 49,554 37,677 443,912 December 31, 2017 By FICO: < 600 $ 5,145 1,768 3,525 8,858 863 20,159 600-639 3,487 1,253 3,101 5,615 904 14,360 640-679 6,789 2,387 5,690 7,696 1,959 24,521 680-719 14,977 4,797 7,628 8,825 3,582 39,809 720-759 27,926 6,246 8,097 7,806 5,089 55,164 760-799 55,590 7,323 6,372 6,468 6,257 82,010 800+ 136,729 15,144 2,994 7,845 8,455 171,167 No FICO available 5,546 768 569 258 2,648 9,789 FICO not required — — — — 8,511 8,511 Government insured/guaranteed loans (1) 15,143 — — — — 15,143 Total consumer loans (excluding PCI) 271,332 39,686 37,976 53,371 38,268 440,633 Total consumer PCI loans (carrying value) 12,722 27 — — — 12,749 Total consumer loans $ 284,054 39,713 37,976 53,371 38,268 453,382 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA.
Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer	Table 6.12 shows the most updated LTV and CLTV distribution of the real estate 1-4 family first and junior lien mortgage loan portfolios. We consider the trends in residential real estate markets as we monitor credit risk and establish our allowance for credit losses. In the event of a default, any loss should be limited to the portion of the loan amount in excess of the net realizable value of the underlying real estate collateral value. Certain loans do not have an LTV or CLTV due to industry data availability and portfolios acquired from or serviced by other institutions. Table 6.12: Consumer Loans by LTV/CLTV March 31, 2018 December 31, 2017 (in millions) Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total By LTV/CLTV: 0-60% $ 135,883 15,854 151,737 133,902 16,301 150,203 60.01-80% 103,368 12,274 115,642 104,639 12,918 117,557 80.01-100% 14,297 6,179 20,476 13,924 6,580 20,504 100.01-120% (1) 1,757 2,245 4,002 1,868 2,427 4,295 > 120% (1) 715 902 1,617 783 1,008 1,791 No LTV/CLTV available 1,234 441 1,675 1,073 452 1,525 Government insured/guaranteed loans (2) 14,795 — 14,795 15,143 — 15,143 Total consumer loans (excluding PCI) 272,049 37,895 309,944 271,332 39,686 311,018 Total consumer PCI loans (carrying value) 10,609 25 10,634 12,722 27 12,749 Total consumer loans $ 282,658 37,920 320,578 284,054 39,713 323,767 (1) Reflects total loan balances with LTV/CLTV amounts in excess of 100%. In the event of default, the loss content would generally be limited to only the amount in excess of 100% LTV/CLTV. (2) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA.
Loans and Allowance for Credit Losses, Nonaccrual Loans	Table 6.13 provides loans on nonaccrual status. PCI loans are excluded from this table because they continue to earn interest from accretable yield, independent of performance in accordance with their contractual terms. Table 6.13: Nonaccrual Loans (in millions) Mar 31, Dec 31, Commercial: Commercial and industrial $ 1,516 1,899 Real estate mortgage 755 628 Real estate construction 45 37 Lease financing 93 76 Total commercial 2,409 2,640 Consumer: Real estate 1-4 family first mortgage (1) 4,053 4,122 Real estate 1-4 family junior lien mortgage 1,087 1,086 Automobile 117 130 Other revolving credit and installment 53 58 Total consumer 5,310 5,396 Total nonaccrual loans (excluding PCI) $ 7,719 8,036 (1) Includes MHFS of $137 million and $136 million at March 31, 2018 , and December 31, 2017 , respectively.
Loans and Allowance for Credit Losses, 90 days or More Past Due and Still Accruing Loans	Table 6.14 shows non-PCI loans 90 days or more past due and still accruing by class for loans not government insured/guaranteed. Table 6.14: Loans 90 Days or More Past Due and Still Accruing (in millions) Mar 31, 2018 Dec 31, 2017 Total (excluding PCI): $ 10,753 11,997 Less: FHA insured/guaranteed by the VA (1)(2) 9,786 10,934 Total, not government insured/guaranteed $ 967 1,063 By segment and class, not government insured/guaranteed: Commercial: Commercial and industrial $ 40 26 Real estate mortgage 23 23 Real estate construction 1 — Total commercial 64 49 Consumer: Real estate 1-4 family first mortgage (2) 164 219 Real estate 1-4 family junior lien mortgage (2) 48 60 Credit card 473 492 Automobile 113 143 Other revolving credit and installment 105 100 Total consumer 903 1,014 Total, not government insured/guaranteed $ 967 1,063 (1) Represents loans whose repayments are predominantly insured by the FHA or guaranteed by the VA. (2) Includes mortgages held for sale 90 days or more past due and still accruing.
Loans and Allowance for Credit Losses, Impaired Loans	Table 6.15 summarizes key information for impaired loans. Our impaired loans predominantly include loans on nonaccrual status in the commercial portfolio segment and loans modified in a TDR, whether on accrual or nonaccrual status. These impaired loans generally have estimated losses which are included in the allowance for credit losses. We have impaired loans with no allowance for credit losses when loss content has been previously recognized through charge-offs and we do not anticipate additional charge-offs or losses, or certain loans are currently performing in accordance with their terms and for which no loss has been estimated. Impaired loans exclude PCI loans. Table 6.15 includes trial modifications that totaled $198 million at March 31, 2018 , and $194 million at December 31, 2017 . For additional information on our impaired loans and allowance for credit losses, see Note 1 (Summary of Significant Accounting Policies) in our 2017 Form 10-K. Table 6.15: Impaired Loans Summary Recorded investment (in millions) Unpaid principal balance (1) Impaired loans Impaired loans with related allowance for credit losses Related allowance for credit losses March 31, 2018 Commercial: Commercial and industrial $ 3,182 2,231 1,978 432 Real estate mortgage 1,554 1,307 1,281 196 Real estate construction 105 61 54 8 Lease financing 177 144 144 33 Total commercial 5,018 3,743 3,457 669 Consumer: Real estate 1-4 family first mortgage 13,692 11,934 4,888 618 Real estate 1-4 family junior lien mortgage 2,072 1,860 1,352 230 Credit card 386 386 386 139 Automobile 153 83 34 5 Other revolving credit and installment 146 138 127 33 Total consumer (2) 16,449 14,401 6,787 1,025 Total impaired loans (excluding PCI) $ 21,467 18,144 10,244 1,694 December 31, 2017 Commercial: Commercial and industrial $ 3,577 2,568 2,310 462 Real estate mortgage 1,502 1,239 1,207 211 Real estate construction 95 54 45 9 Lease financing 132 99 89 23 Total commercial 5,306 3,960 3,651 705 Consumer: Real estate 1-4 family first mortgage 14,020 12,225 6,060 770 Real estate 1-4 family junior lien mortgage 2,135 1,918 1,421 245 Credit card 356 356 356 136 Automobile 157 87 34 5 Other revolving credit and installment 136 128 117 29 Total consumer (2) 16,804 14,714 7,988 1,185 Total impaired loans (excluding PCI) $ 22,110 18,674 11,639 1,890 (1) Excludes the unpaid principal balance for loans that have been fully charged off or otherwise have zero recorded investment. (2) Includes the recorded investment of $1.4 billion at both March 31, 2018 and December 31, 2017 , of government insured/guaranteed loans that are predominantly insured by the FHA or guaranteed by the VA and generally do not have an allowance. Impaired loans may also have limited, if any, allowance when the recorded investment of the loan approximates estimated net realizable value as a result of charge-offs prior to a TDR modification.
Loans and Allowance for Credit Losses, Average Recorded Investment in Impaired Loans	Table 6.16 provides the average recorded investment in impaired loans and the amount of interest income recognized on impaired loans by portfolio segment and class. Table 6.16: Average Recorded Investment in Impaired Loans Quarter ended March 31, 2018 2017 (in millions) Average recorded investment Recognized interest income Average recorded investment Recognized interest income Commercial: Commercial and industrial $ 2,404 36 3,675 33 Real estate mortgage 1,244 28 1,394 27 Real estate construction 58 1 84 1 Lease financing 129 — 119 — Total commercial 3,835 65 5,272 61 Consumer: Real estate 1-4 family first mortgage 12,073 172 14,132 190 Real estate 1-4 family junior lien mortgage 1,889 29 2,131 31 Credit card 370 10 302 8 Automobile 85 3 83 3 Other revolving credit and installment 133 2 106 2 Total consumer 14,550 216 16,754 234 Total impaired loans (excluding PCI) $ 18,385 281 22,026 295 Interest income: Cash basis of accounting $ 81 78 Other (1) 200 217 Total interest income $ 281 295 (1) Includes interest recognized on accruing TDRs, interest recognized related to certain impaired loans which have an allowance calculated using discounting, and amortization of purchase accounting adjustments related to certain impaired loans.
Loans and Allowance for Credit Losses, Troubled Debt Restructurings, Modification by Type	Table 6.17 summarizes our TDR modifications for the periods presented by primary modification type and includes the financial effects of these modifications. For those loans that modify more than once, the table reflects each modification that occurred during the period. Loans that both modify and pay off within the period, as well as changes in recorded investment during the period for loans modified in prior periods, are not included in the table. Table 6.17: TDR Modifications Primary modification type (1) Financial effects of modifications (in millions) Principal (2) Interest rate reduction Other concessions (3) Total Charge- offs (4) Weighted average interest rate reduction Recorded investment related to interest rate reduction (5) Quarter ended March 31, 2018 Commercial: Commercial and industrial $ — 9 488 497 6 1.07 % $ 9 Real estate mortgage — 6 98 104 — 1.24 6 Real estate construction — — 3 3 — — — Lease financing — — 39 39 — — — Total commercial — 15 628 643 6 1.15 15 Consumer: Real estate 1-4 family first mortgage 46 10 306 362 1 2.40 35 Real estate 1-4 family junior lien mortgage 1 8 28 37 1 2.22 9 Credit card — 86 — 86 — 11.32 86 Automobile 1 4 14 19 9 6.48 4 Other revolving credit and installment — 15 2 17 — 7.94 15 Trial modifications (6) — — 15 15 — — — Total consumer 48 123 365 536 11 8.20 149 Total $ 48 138 993 1,179 17 7.55 % $ 164 Quarter ended March 31, 2017 Commercial: Commercial and industrial $ — 6 928 934 65 0.82 % $ 6 Real estate mortgage — 14 181 195 — 1.00 14 Real estate construction — — 3 3 — 2.00 — Lease financing — — 3 3 — — — Total commercial — 20 1,115 1,135 65 0.95 20 Consumer: Real estate 1-4 family first mortgage 74 72 291 437 9 2.60 103 Real estate 1-4 family junior lien mortgage 13 21 23 57 6 2.95 24 Credit card — 57 — 57 — 12.22 57 Automobile 1 3 12 16 7 6.42 3 Other revolving credit and installment — 11 3 14 — 7.29 11 Trial modifications (6) — — (17 ) (17 ) — — — Total consumer 88 164 312 564 22 5.72 198 Total $ 88 184 1,427 1,699 87 5.27 % $ 218 (1) Amounts represent the recorded investment in loans after recognizing the effects of the TDR, if any. TDRs may have multiple types of concessions, but are presented only once in the first modification type based on the order presented in the table above. The reported amounts include loans remodified of $503 million and $657 million for the quarters ended March 31, 2018 and 2017 , respectively. (2) Principal modifications include principal forgiveness at the time of the modification, contingent principal forgiveness granted over the life of the loan based on borrower performance, and principal that has been legally separated and deferred to the end of the loan, with a zero percent contractual interest rate. (3) Other concessions include loans discharged in bankruptcy, loan renewals, term extensions and other interest and noninterest adjustments, but exclude modifications that also forgive principal and/or reduce the contractual interest rate. (4) Charge-offs include write-downs of the investment in the loan in the period it is contractually modified. The amount of charge-off will differ from the modification terms if the loan has been charged down prior to the modification based on our policies. In addition, there may be cases where we have a charge-off/down with no legal principal modification. Modifications resulted in legally forgiving principal (actual, contingent or deferred) of $3 million and $9 million for the quarters ended March 31, 2018 and 2017 , respectively. (5) Reflects the effect of reduced interest rates on loans with an interest rate concession as one of their concession types, which includes loans reported as a principal primary modification type that also have an interest rate concession. (6) Trial modifications are granted a delay in payments due under the original terms during the trial payment period. However, these loans continue to advance through delinquency status and accrue interest according to their original terms. Any subsequent permanent modification generally includes interest rate related concessions; however, the exact concession type and resulting financial effect are usually not known until the loan is permanently modified. Trial modifications for the period are presented net of previously reported trial modifications that became permanent in the current period.
Loans and Allowance for Credit Losses, Troubled Debt Restructuring, Current Defaults	Table 6.18 summarizes permanent modification TDRs that have defaulted in the current period within 12 months of their permanent modification date. We are reporting these defaulted TDRs based on a payment default definition of 90 days past due for the commercial portfolio segment and 60 days past due for the consumer portfolio segment. Table 6.18: Defaulted TDRs Recorded investment of defaults Quarter ended March 31, (in millions) 2018 2017 Commercial: Commercial and industrial $ 86 62 Real estate mortgage 26 21 Real estate construction — — Total commercial 112 83 Consumer: Real estate 1-4 family first mortgage 18 25 Real estate 1-4 family junior lien mortgage 5 4 Credit card 13 15 Automobile 3 3 Other revolving credit and installment 1 1 Total consumer 40 48 Total $ 152 131
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans, Loans Outstanding	Table 6.19 presents PCI loans net of any remaining purchase accounting adjustments. Real estate 1-4 family first mortgage PCI loans are predominantly Pick-a-Pay loans. Table 6.19: PCI Loans (in millions) Mar 31, Dec 31, Total commercial $ 75 86 Consumer: Real estate 1-4 family first mortgage 10,609 12,722 Real estate 1-4 family junior lien mortgage 25 27 Total consumer 10,634 12,749 Total PCI loans (carrying value) $ 10,709 12,835 Total PCI loans (unpaid principal balance) $ 15,447 18,975
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans, Accretable Yield	The change in the accretable yield related to PCI loans since the merger with Wachovia is presented in Table 6.20 . Changes during first quarter 2018 reflect an expectation, as a result of our quarterly evaluation of PCI cash flows, that prepayment of modified Pick-a-Pay loans will increase over their estimated weighted-average life and that expected loss has decreased as a result of reduced loan to value ratios and sustained higher housing prices. Changes during first quarter 2018 also reflect a $643 million gain on the sale of $1.6 billion Pick-a-Pay PCI loans. Table 6.20: Change in Accretable Yield (in millions) Quarter 2009-2017 Balance, beginning of period $ 8,887 10,447 Change in accretable yield due to acquisitions — 161 Accretion into interest income (1) (314 ) (16,983 ) Accretion into noninterest income due to sales (2) (643 ) (801 ) Reclassification from nonaccretable difference for loans with improving credit-related cash flows 340 11,597 Changes in expected cash flows that do not affect nonaccretable difference (3) (1,406 ) 4,466 Balance, end of period $ 6,864 8,887 (1) Includes accretable yield released as a result of settlements with borrowers, which is included in interest income. (2) Includes accretable yield released as a result of sales to third parties, which is included in noninterest income. (3) Represents changes in cash flows expected to be collected due to the impact of modifications, changes in prepayment assumptions, changes in interest rates on variable rate PCI loans and sales to third parties.
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans by Credit Quality Indicator	Table 6.21 provides a breakdown of commercial PCI loans by risk category. Table 6.21: Commercial PCI Loans by Risk Category (in millions) Total March 31, 2018 By risk category: Pass $ 6 Criticized 69 Total commercial PCI loans $ 75 December 31, 2017 By risk category: Pass $ 8 Criticized 78 Total commercial PCI loans $ 86
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans by Delinquency Status, Commercial	Table 6.22 provides past due information for commercial PCI loans. Table 6.22: Commercial PCI Loans by Delinquency Status (in millions) Total March 31, 2018 By delinquency status: Current-29 DPD and still accruing $ 74 30-89 DPD and still accruing 1 90+ DPD and still accruing — Total commercial PCI loans $ 75 December 31, 2017 By delinquency status: Current-29 DPD and still accruing $ 86 30-89 DPD and still accruing — 90+ DPD and still accruing — Total commercial PCI loans $ 86
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans by Delinquency Status, Consumer	Table 6.23 provides the delinquency status of consumer PCI loans. Table 6.23: Consumer PCI Loans by Delinquency Status - March 31, 2018 December 31, 2017 (in millions) Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Total Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Total By delinquency status: Current-29 DPD and still accruing $ 11,310 136 11,446 13,127 138 13,265 30-59 DPD and still accruing 1,044 6 1,050 1,317 8 1,325 60-89 DPD and still accruing 496 2 498 622 3 625 90-119 DPD and still accruing 221 2 223 293 2 295 120-179 DPD and still accruing 158 1 159 219 2 221 180+ DPD and still accruing 947 4 951 1,310 4 1,314 Total consumer PCI loans (adjusted unpaid principal balance) $ 14,176 151 14,327 16,888 157 17,045 Total consumer PCI loans (carrying value) $ 10,609 25 10,634 12,722 27 12,749
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans by FICO Score, Consumer	Table 6.24 provides FICO scores for consumer PCI loans. Table 6.24: Consumer PCI Loans by FICO March 31, 2018 December 31, 2017 (in millions) Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Total Real estate 1-4 family first mortgage Real estate 1-4 family junior lien mortgage Total By FICO: < 600 $ 3,307 33 3,340 4,014 37 4,051 600-639 1,794 21 1,815 2,086 20 2,106 640-679 2,020 24 2,044 2,393 24 2,417 680-719 1,867 28 1,895 2,242 29 2,271 720-759 1,475 22 1,497 1,779 23 1,802 760-799 799 11 810 933 12 945 800+ 456 7 463 468 6 474 No FICO available 2,458 5 2,463 2,973 6 2,979 Total consumer PCI loans (adjusted unpaid principal balance) $ 14,176 151 14,327 16,888 157 17,045 Total consumer PCI loans (carrying value) $ 10,609 25 10,634 12,722 27 12,749
Loans and Allowance for Credit Losses, Purchased Credit Impaired Loans by Loan to Value Ratio, Consumer	Table 6.25 shows the distribution of consumer PCI loans by LTV for real estate 1-4 family first mortgages and by CLTV for real estate 1-4 family junior lien mortgages. Table 6.25: Consumer PCI Loans by LTV/CLTV March 31, 2018 December 31, 2017 (in millions) Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total Real estate 1-4 family first mortgage by LTV Real estate 1-4 family junior lien mortgage by CLTV Total By LTV/CLTV: 0-60% $ 7,095 46 7,141 8,010 45 8,055 60.01-80% 5,224 61 5,285 6,510 63 6,573 80.01-100% 1,540 31 1,571 1,975 35 2,010 100.01-120% (1) 260 9 269 319 10 329 > 120% (1) 56 3 59 73 3 76 No LTV/CLTV available 1 1 2 1 1 2 Total consumer PCI loans (adjusted unpaid principal balance) $ 14,176 151 14,327 16,888 157 17,045 Total consumer PCI loans (carrying value) $ 10,609 25 10,634 12,722 27 12,749 (1) Reflects total loan balances with LTV/CLTV amounts in excess of 100%. In the event of default, the loss content would generally be limited to only the amount in excess of 100% LTV/CLTV.

Equity Securities (Tables)

Equity Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Equity Securities [Abstract]
Equity Securities	Table 7.1 provides a summary of our equity securities by business purpose and accounting model, including equity securities with readily determinable fair values (marketable) and those without readily determinable fair values (nonmarketable). Table 7.1: Equity Securities Mar 31, Dec 31, (in millions) 2018 2017 Held for trading at fair value: Marketable equity securities $ 25,327 30,004 Not held for trading: Fair value: Marketable equity securities (1) 4,931 4,356 Nonmarketable equity securities (2) 5,303 4,867 Total equity securities at fair value 10,234 9,223 Equity method: LIHTC (3) 10,318 10,269 Private equity 3,840 3,839 Tax-advantaged renewable energy 1,822 1,950 New market tax credit and other 268 294 Total equity method 16,248 16,352 Other: Federal bank stock and other at cost (4) 5,780 5,828 Private equity (5) 1,346 1,090 Total equity securities not held for trading 33,608 32,493 Total equity securities $ 58,935 62,497 (1) Includes $ 3.5 billion and $ 3.7 billion at March 31, 2018, and December 31, 2017, respectively, related to securities held as economic hedges of our deferred compensation plan obligations. (2) Includes $ 5.0 billion and $ 4.9 billion at March 31, 2018, and December 31, 2017, respectively, related to investments in which we elected fair value option. See Note 15 (Fair Value of Assets and Liabilities) for additional information. (3) Represents low-income housing tax credit investments. (4) Includes $ 5.7 billion and $ 5.4 billion at March 31, 2018, and December 31, 2017, respectively, related to investments in Federal Reserve Bank and Federal Home Loan Bank stock. (5) Represents nonmarketable equity securities for which we have elected to account for the security under the measurement alternative.
Net Gains (Losses) from Equity Securities	Table 7.2 provides a summary of the net gains and losses for equity securities. Gains and losses for securities held for trading are reported in net gains from trading activities. Table 7.2: Net Gains (Losses) from Equity Securities Quarter ended March 31, (in millions) 2018 2017 Net gains (losses) from equity securities carried at fair value: Marketable equity securities $ 8 283 Nonmarketable equity securities 109 482 Total equity securities carried at fair value 117 765 Net gains (losses) from nonmarketable equity securities not carried at fair value: Impairment write-downs (20 ) (76 ) Net unrealized gains (losses) related to measurement alternative observable transactions 228 — Net realized gains on sale 498 326 All other 18 29 Total nonmarketable equity securities not carried at fair value 724 279 Net gains (losses) from economic hedge derivatives (1) (58 ) (474 ) Total net gains (losses) from equity securities $ 783 570 (1) Includes net gains (losses) on derivatives not designated as hedging instruments.
Measurement Alternative	Table 7.3 provides additional information about the impairment write-downs and observable price adjustments related to nonmarketable equity securities accounted for under the measurement alternative. Gains and losses related to these adjustments are also included in Table 7.2. Table 7.3: Measurement Alternative Quarter ended March 31, (in millions) 2018 Net gains (losses) recognized in earnings during the period: Gross unrealized gains due to observable price changes $ 228 Gross unrealized losses due to observable price changes — Impairment write-downs (7 ) Realized net gains (losses) from sale 75 Total net gains (losses) recognized during the period $ 296 Cumulative gains (losses) due to observable price changes (1): Gross unrealized gains $ 228 Gross unrealized losses — (1) Cumulative balances are recorded for nonmarketable equity securities accounted for under the measurement alternative that are recognized on the balance sheet as of March 31, 2018.

Other Assets (Tables)

Other Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Other Assets [Abstract]
Components of Other Assets	Table 8.1 presents the components of other assets. Table 8.1: Other Assets (in millions) Mar 31, Dec 31, Corporate/bank-owned life insurance $ 19,589 19,549 Accounts receivable (1) 37,322 39,127 Interest receivable 5,824 5,688 Core deposit intangibles 577 769 Customer relationship and other amortized intangibles 766 841 Foreclosed assets: Residential real estate: Government insured/guaranteed (1) 103 120 Non-government insured/guaranteed 239 252 Non-residential real estate 229 270 Operating lease assets 9,382 9,666 Due from customers on acceptances 196 177 Other 11,661 13,785 Total other assets $ 85,888 90,244 (1) Certain government-guaranteed residential real estate mortgage loans upon foreclosure are included in Accounts receivable. Both principal and interest related to these foreclosed real estate assets are collectible because the loans were predominantly insured by the FHA or guaranteed by the VA. For more information on the classification of certain government-guaranteed mortgage loans upon foreclosure, see Note 1 (Summary of Significant Accounting Policies) to Financial Statements in our 2017 10-K.

Securitizations and Variable 40

Securitizations and Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2018
Securitizations and Variable Interest Entities [Abstract]
Balance Sheet Transactions With VIEs	Table 9.1 provides the classifications of assets and liabilities in our balance sheet for our transactions with VIEs. Table 9.1: Balance Sheet Transactions with VIEs (in millions) VIEs that we do not consolidate VIEs that we consolidate Transfers that we account for as secured borrowings Total March 31, 2018 Cash $ — 111 — 111 Interest-earning deposits with banks — 8 — 8 Debt securities: Trading debt securities 2,011 — 200 2,211 Available-for-sale debt securities (1) 3,405 — 343 3,748 Held-to-maturity debt securities 502 — — 502 Loans 2,766 13,007 106 15,879 Mortgage servicing rights 14,977 — — 14,977 Derivative assets 124 — — 124 Equity securities 10,683 28 — 10,711 Other assets — 230 7 237 Total assets 34,468 13,384 656 48,508 Short-term borrowings — — 512 512 Derivative liabilities 45 4 (2) — 49 Accrued expenses and other liabilities 245 127 (2) 10 382 Long-term debt 3,507 947 (2) 107 4,561 Total liabilities 3,797 1,078 629 5,504 Noncontrolling interests — 31 — 31 Net assets $ 30,671 12,275 27 42,973 December 31, 2017 Cash $ — 116 — 116 Interest-earning deposits with banks — 371 — 371 Debt securities: Trading debt securities 1,305 — 201 1,506 Available-for-sale debt securities (1) 3,288 — 358 3,646 Held-to-maturity debt securities 485 — — 485 Loans 4,274 12,482 110 16,866 Mortgage servicing rights 13,628 — — 13,628 Derivative assets 44 — — 44 Equity securities 10,740 306 — 11,046 Other assets — 342 6 348 Total assets 33,764 13,617 675 48,056 Short-term borrowings — — 522 522 Derivative liabilities 106 5 (2) — 111 Accrued expenses and other liabilities 244 132 (2) 10 386 Long-term debt 3,590 1,479 (2) 111 5,180 Total liabilities 3,940 1,616 643 6,199 Noncontrolling interests — 283 — 283 Net assets $ 29,824 11,718 32 41,574 (1) Excludes certain debt securities related to loans serviced for the Federal National Mortgage Association (FNMA), Federal Home Loan Mortgage Corporation (FHLMC) and GNMA. (2) There were no VIE liabilities with recourse to the general credit of Wells Fargo for the periods presented.
Unconsolidated VIEs	Table 9.2 provides a summary of unconsolidated VIEs with which we have significant continuing involvement, but we are not the primary beneficiary. We do not consider our continuing involvement in an unconsolidated VIE to be significant when it relates to third-party sponsored VIEs for which we were not the transferor (unless we are servicer and have other significant forms of involvement) or if we were the sponsor only or sponsor and servicer but do not have any other forms of significant involvement. Significant continuing involvement includes transactions where we were the sponsor or transferor and have other significant forms of involvement. Sponsorship includes transactions with unconsolidated VIEs where we solely or materially participated in the initial design or structuring of the entity or marketing of the transaction to investors. When we transfer assets to a VIE and account for the transfer as a sale, we are considered the transferor. We consider investments in securities (other than those held temporarily in trading), loans, guarantees, liquidity agreements, written options and servicing of collateral to be other forms of involvement that may be significant. We have excluded certain transactions with unconsolidated VIEs from the balances presented in the following table where we have determined that our continuing involvement is not significant due to the temporary nature and size of our variable interests, because we were not the transferor or because we were not involved in the design of the unconsolidated VIEs. We also exclude from the table secured borrowing transactions with unconsolidated VIEs (for information on these transactions, see the Transactions with Consolidated VIEs and Secured Borrowings section in this Note). Table 9.2: Unconsolidated VIEs Carrying value – asset (liability) (in millions) Total VIE assets Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Net assets March 31, 2018 Residential mortgage loan securitizations: Conforming (2) $ 1,171,619 2,851 14,044 — (190 ) 16,705 Other/nonconforming 13,057 552 68 — — 620 Commercial mortgage securitizations 146,886 2,350 865 (43 ) (35 ) 3,137 Collateralized debt obligations: Debt securities 1,010 — — 5 (20 ) (15 ) Loans (3) — — — — — — Asset-based finance structures 2,192 1,749 — — — 1,749 Tax credit structures 32,270 11,345 — — (3,507 ) 7,838 Collateralized loan obligations 7 — — — — — Investment funds 212 51 — — — 51 Other (4) 2,002 469 — 117 — 586 Total $ 1,369,255 19,367 14,977 79 (3,752 ) 30,671 Maximum exposure to loss Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Total exposure Residential mortgage loan securitizations: Conforming $ 2,851 14,044 — 1,257 18,152 Other/nonconforming 552 68 — — 620 Commercial mortgage securitizations 2,350 865 45 10,328 13,588 Collateralized debt obligations: Debt securities — — 5 20 25 Loans (3) — — — — — Asset-based finance structures 1,749 — — 71 1,820 Tax credit structures 11,345 — — 1,242 12,587 Collateralized loan obligations — — — — — Investment funds 51 — — — 51 Other (4) 469 — 134 157 760 Total $ 19,367 14,977 184 13,075 47,603 (continued on following page) (continued from previous page) Carrying value – asset (liability) (in millions) Total VIE assets Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Net assets December 31, 2017 Residential mortgage loan securitizations: Conforming (2) $ 1,169,410 2,100 12,665 — (190 ) 14,575 Other/nonconforming 14,175 598 73 — — 671 Commercial mortgage securitizations 144,650 2,198 890 28 (34 ) 3,082 Collateralized debt obligations: Debt securities 1,031 — — 5 (20 ) (15 ) Loans (3) 1,481 1,443 — — — 1,443 Asset-based finance structures 2,333 1,867 — — — 1,867 Tax credit structures 31,852 11,258 — — (3,590 ) 7,668 Collateralized loan obligations 23 1 — — — 1 Investment funds 225 50 — — — 50 Other (4) 2,257 577 — (95 ) — 482 Total $ 1,367,437 20,092 13,628 (62 ) (3,834 ) 29,824 Maximum exposure to loss Debt and equity interests (1) Servicing assets Derivatives Other commitments and guarantees Total exposure Residential mortgage loan securitizations: Conforming $ 2,100 12,665 — 1,137 15,902 Other/nonconforming 598 73 — — 671 Commercial mortgage securitizations 2,198 890 42 10,202 13,332 Collateralized debt obligations: Debt securities — — 5 20 25 Loans (3) 1,443 — — — 1,443 Asset-based finance structures 1,867 — — 71 1,938 Tax credit structures 11,258 — — 1,175 12,433 Collateralized loan obligations 1 — — — 1 Investment funds 50 — — — 50 Other (4) 577 — 120 157 854 Total $ 20,092 13,628 167 12,762 46,649 (1) Includes total equity interests of $10.7 billion at both March 31, 2018 , and December 31, 2017 . Also includes debt interests in the form of both loans and securities. Excludes certain debt securities held related to loans serviced for FNMA, FHLMC and GNMA. (2) Excludes assets and related liabilities with a recorded carrying value on our balance sheet of $1.2 billion and $2.2 billion at March 31, 2018 , and December 31, 2017 , respectively, for certain delinquent loans that are eligible for repurchase from GNMA loan securitizations. The recorded carrying value represents the amount that would be payable if the Company was to exercise the repurchase option. The carrying amounts are excluded from the table because the loans eligible for repurchase do not represent interests in the VIEs. (3) Represents senior loans to trusts that are collateralized by asset-backed securities. The trusts invested in senior tranches from a diversified pool of U.S. asset securitizations, of which all were current and 100% were rated as investment grade by the primary rating agencies at December 31, 2017 . These senior loans were accounted for at amortized cost and were subject to the Company’s allowance and credit charge-off policies. The securitization was terminated in first quarter 2018. (4) Includes structured financing and credit-linked note structures. Also contains investments in auction rate securities (ARS) issued by VIEs that we do not sponsor and, accordingly, are unable to obtain the total assets of the entity.
Cash Flows from Sales and Securitization Activity	Table 9.3 presents the cash flows for our transfers accounted for as sales. Table 9.3: Cash Flows From Sales and Securitization Activity 2018 2017 (in millions) Mortgage loans Other financial assets Mortgage loans Other financial assets Quarter ended March 31, Proceeds from securitizations and whole loan sales $ 50,587 — 58,257 21 Fees from servicing rights retained 845 — 854 — Cash flows from other interests held (1) 185 — 834 — Repurchases of assets/loss reimbursements (2): Non-agency securitizations and whole loan transactions 1 — 2 — Agency securitizations (3) 33 — 23 — Servicing advances, net of repayments (36 ) — (142 ) — (1) Cash flows from other interests held include principal and interest payments received on retained bonds and excess cash flows received on interest-only strips. (2) Consists of cash paid to repurchase loans from investors and cash paid to investors to reimburse them for losses on individual loans that are already liquidated. (3) Represent loans repurchased from GNMA, FNMA, and FHLMC under representation and warranty provisions included in our loan sales contracts. First quarter 2018 and 2017 exclude $ 2.9 billion and $2.3 billion , respectively, in delinquent insured/guaranteed loans that we service and have exercised our option to purchase out of GNMA pools. These loans are predominantly insured by the FHA or guaranteed by the VA.
Residential Mortgage Servicing Rights	Table 9.4 presents the key weighted-average assumptions we used to measure residential mortgage servicing rights at the date of securitization. Table 9.4: Residential Mortgage Servicing Rights Residential mortgage servicing rights 2018 2017 Quarter ended March 31, Prepayment speed (1) 9.6 % 10.3 Discount rate 7.3 6.8 Cost to service ($ per loan) (2) $ 117 134 (1) The prepayment speed assumption for residential mortgage servicing rights includes a blend of prepayment speeds and default rates. Prepayment speed assumptions are influenced by mortgage interest rate inputs as well as our estimation of drivers of borrower behavior. (2) Includes costs to service and unreimbursed foreclosure costs, which can vary period to period depending on the mix of modified government-guaranteed loans sold to GNMA.
Retained Interests from Unconsolidated VIEs	Table 9.5 provides key economic assumptions and the sensitivity of the current fair value of residential mortgage servicing rights and other interests held to immediate adverse changes in those assumptions. “Other interests held” relate to residential and commercial mortgage loan securitizations. Residential mortgage-backed securities retained in securitizations issued through GSEs, such as FNMA, FHLMC and GNMA, are excluded from the table because these securities have a remote risk of credit loss due to the GSE guarantee. These securities also have economic characteristics similar to GSE mortgage-backed securities that we purchase, which are not included in the table. Subordinated interests include only those bonds whose credit rating was below AAA by a major rating agency at issuance. Senior interests include only those bonds whose credit rating was AAA by a major rating agency at issuance. The information presented excludes trading positions held in inventory. Table 9.5: Retained Interests from Unconsolidated VIEs Other interests held Residential mortgage servicing rights (1) Interest-only strips Commercial (2) ($ in millions, except cost to service amounts) Subordinated bonds Senior bonds Fair value of interests held at March 31, 2018 $ 15,041 18 611 443 Expected weighted-average life (in years) 6.8 3.6 6.4 5.0 Key economic assumptions: Prepayment speed assumption (3) 9.3 % 18.3 Decrease in fair value from: 10% adverse change $ 546 1 25% adverse change 1,298 2 Discount rate assumption 7.2 % 15.4 3.8 3.5 Decrease in fair value from: 100 basis point increase $ 729 — 42 18 200 basis point increase 1,394 1 71 36 Cost to service assumption ($ per loan) 136 Decrease in fair value from: 10% adverse change 451 25% adverse change 1,127 Credit loss assumption 8.0 — Decrease in fair value from: 10% higher losses 13 — 25% higher losses 17 — Fair value of interests held at December 31, 2017 $ 13,625 19 596 468 Expected weighted-average life (in years) 6.2 3.3 6.7 5.2 Key economic assumptions: Prepayment speed assumption (3) 10.5 % 20.0 Decrease in fair value from: 10% adverse change $ 565 1 25% adverse change 1,337 2 Discount rate assumption 6.9 % 14.8 4.1 3.1 Decrease in fair value from: 100 basis point increase $ 652 — 32 20 200 basis point increase 1,246 1 61 39 Cost to service assumption ($ per loan) 143 Decrease in fair value from: 10% adverse change 467 25% adverse change 1,169 Credit loss assumption 1.8 — Decrease in fair value from: 10% higher losses — — 25% higher losses — — (1) See narrative following this table for a discussion of commercial mortgage servicing rights. (2) Prepayment speed assumptions do not significantly impact the value of commercial mortgage securitization bonds as the underlying commercial mortgage loans experience significantly lower prepayments due to certain contractual restrictions, impacting the borrower’s ability to prepay the mortgage. (3) The prepayment speed assumption for residential mortgage servicing rights includes a blend of prepayment speeds and default rates. Prepayment speed assumptions are influenced by mortgage interest rate inputs as well as our estimation of drivers of borrower behavior.
Off-Balance Sheet Loans Sold Or Securitized	Table 9.6 presents information about the principal balances of off-balance sheet loans that were sold or securitized, including residential mortgage loans sold to FNMA, FHLMC, GNMA and other investors, for which we have some form of continuing involvement (including servicer). Delinquent loans include loans 90 days or more past due and loans in bankruptcy, regardless of delinquency status. For loans sold or securitized where servicing is our only form of continuing involvement, we would only experience a loss if we were required to repurchase a delinquent loan or foreclosed asset due to a breach in representations and warranties associated with our loan sale or servicing contracts. Table 9.6: Off-Balance Sheet Loans Sold or Securitized Net charge-offs Total loans Delinquent loans and foreclosed assets (1) Quarter ended Mar 31, (in millions) Mar 31, 2018 Dec 31, 2017 Mar 31, 2018 Dec 31, 2017 2018 2017 Commercial: Real estate mortgage $ 101,784 100,875 2,622 2,839 10 295 Total commercial 101,784 100,875 2,622 2,839 10 295 Consumer: Real estate 1-4 family first mortgage 1,122,010 1,126,208 11,823 13,393 116 200 Total consumer 1,122,010 1,126,208 11,823 13,393 116 200 Total off-balance sheet sold or securitized loans (2) $ 1,223,794 1,227,083 14,445 16,232 126 495 (1) Includes $1.2 billion of commercial foreclosed assets at both dates and $892 million and $879 million of consumer foreclosed assets at March 31, 2018 , and December 31, 2017 , respectively. (2) At March 31, 2018 , and December 31, 2017 , the table includes total loans of $1.1 trillion at both dates, delinquent loans of $7.9 billion and $9.1 billion , and foreclosed assets of $628 million and $619 million , respectively, for FNMA, FHLMC and GNMA. Net charge-offs exclude loans sold to FNMA, FHLMC and GNMA as we do not service or manage the underlying real estate upon foreclosure and, as such, do not have access to net charge-off information.
Transactions With Consolidated VIEs And Secured Borrowings	Table 9.7 presents a summary of financial assets and liabilities for asset transfers accounted for as secured borrowings and involvements with consolidated VIEs. Carrying values of “Assets” are presented using GAAP measurement methods, which may include fair value, credit impairment or other adjustments, and therefore in some instances will differ from “Total VIE assets.” For VIEs that obtain exposure synthetically through derivative instruments, the remaining notional amount of the derivative is included in “Total VIE assets.” On the consolidated balance sheet, we separately disclose the consolidated assets of certain VIEs that can only be used to settle the liabilities of those VIEs. Table 9.7: Transactions with Consolidated VIEs and Secured Borrowings Carrying value (in millions) Total VIE assets Assets Liabilities Noncontrolling interests Net assets March 31, 2018 Secured borrowings: Municipal tender option bond securitizations $ 647 550 (522 ) — 28 Residential mortgage securitizations 109 106 (107 ) — (1 ) Total secured borrowings 756 656 (629 ) — 27 Consolidated VIEs: Commercial and industrial loans and leases 8,652 8,607 (420 ) (10 ) 8,177 Nonconforming residential mortgage loan securitizations 2,386 2,092 (653 ) — 1,439 Commercial real estate loans 2,594 2,594 — — 2,594 Structured asset finance 7 5 (4 ) — 1 Investment funds 24 24 — — 24 Other 70 62 (1 ) (21 ) 40 Total consolidated VIEs 13,733 13,384 (1,078 ) (31 ) 12,275 Total secured borrowings and consolidated VIEs $ 14,489 14,040 (1,707 ) (31 ) 12,302 December 31, 2017 Secured borrowings: Municipal tender option bond securitizations $ 658 565 (532 ) — 33 Residential mortgage securitizations 113 110 (111 ) — (1 ) Total secured borrowings 771 675 (643 ) — 32 Consolidated VIEs: Commercial and industrial loans and leases 9,116 8,626 (915 ) (29 ) 7,682 Nonconforming residential mortgage loan securitizations 2,515 2,212 (694 ) — 1,518 Commercial real estate loans 2,378 2,378 — — 2,378 Structured asset finance 10 6 (4 ) — 2 Investment funds 305 305 (2 ) (230 ) 73 Other 100 90 (1 ) (24 ) 65 Total consolidated VIEs 14,424 13,617 (1,616 ) (283 ) 11,718 Total secured borrowings and consolidated VIEs $ 15,195 14,292 (2,259 ) (283 ) 11,750

Mortgage Banking Activities (Ta

Mortgage Banking Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Banking Activities [Abstract]
Analysis of Changes in Fair Value MSRs	Table 10.1 presents the changes in MSRs measured using the fair value method. Table 10.1: Analysis of Changes in Fair Value MSRs Quarter ended March 31, (in millions) 2018 2017 Fair value, beginning of period $ 13,625 12,959 Servicing from securitizations or asset transfers (1) 573 583 Sales and other (2) (4 ) (47 ) Net additions 569 536 Changes in fair value: Due to changes in valuation model inputs or assumptions: Mortgage interest rates (3) 1,253 152 Servicing and foreclosure costs (4) 34 27 Prepayment estimates and other (5) 43 (5 ) Net changes in valuation model inputs or assumptions 1,330 174 Changes due to collection/realization of expected cash flows over time (483 ) (461 ) Total changes in fair value 847 (287 ) Fair value, end of period $ 15,041 13,208 (1) Includes impacts associated with exercising our right to repurchase delinquent loans from GNMA loan securitization pools. (2) Includes sales and transfers of MSRs, which can result in an increase of total reported MSRs if the sales or transfers are related to nonperforming loan portfolios or portfolios with servicing liabilities. (3) Includes prepayment speed changes as well as other valuation changes due to changes in mortgage interest rates (such as changes in estimated interest earned on custodial deposit balances). (4) Includes costs to service and unreimbursed foreclosure costs. (5) Represents changes driven by other valuation model inputs or assumptions including prepayment speed estimation changes and other assumption updates. Prepayment speed estimation changes are influenced by observed changes in borrower behavior and other external factors that occur independent of interest rate changes.
Analysis of Changes in Amortized MSRs	Table 10.2 presents the changes in amortized MSRs. Table 10.2: Analysis of Changes in Amortized MSRs Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 1,424 1,406 Purchases 18 18 Servicing from securitizations or asset transfers 34 45 Amortization (65 ) (67 ) Balance, end of period (1) $ 1,411 1,402 Fair value of amortized MSRs: Beginning of period $ 2,025 1,956 End of period 2,307 2,051 (1) Commercial amortized MSRs are evaluated for impairment purposes by the following risk strata: agency (GSEs) for multi-family properties and non-agency. There was no valuation allowance recorded for the periods presented on the commercial amortized MSRs.
Managed Servicing Portfolio	We present the components of our managed servicing portfolio in Table 10.3 at unpaid principal balance for loans serviced and subserviced for others and at book value for owned loans serviced. Table 10.3: Managed Servicing Portfolio (in billions) Mar 31, 2018 Dec 31, 2017 Residential mortgage servicing: Serviced for others $ 1,201 1,209 Owned loans serviced 337 342 Subserviced for others 5 3 Total residential servicing 1,543 1,554 Commercial mortgage servicing: Serviced for others 510 495 Owned loans serviced 125 127 Subserviced for others 10 9 Total commercial servicing 645 631 Total managed servicing portfolio $ 2,188 2,185 Total serviced for others $ 1,711 1,704 Ratio of MSRs to related loans serviced for others 0.96 % 0.88
Mortgage Banking Noninterest Income	Table 10.4 presents the components of mortgage banking noninterest income. Table 10.4: Mortgage Banking Noninterest Income Quarter ended March 31, (in millions) 2018 2017 Servicing income, net: Servicing fees: Contractually specified servicing fees $ 916 907 Late charges 44 48 Ancillary fees 40 50 Unreimbursed direct servicing costs (1) (94 ) (123 ) Net servicing fees 906 882 Changes in fair value of MSRs carried at fair value: Due to changes in valuation model inputs or assumptions (2) (A) 1,330 174 Changes due to collection/realization of expected cash flows over time (483 ) (461 ) Total changes in fair value of MSRs carried at fair value 847 (287 ) Amortization (65 ) (67 ) Net derivative losses from economic hedges (3) (B) (1,220 ) (72 ) Total servicing income, net 468 456 Net gains on mortgage loan origination/sales activities 466 772 Total mortgage banking noninterest income $ 934 1,228 Market-related valuation changes to MSRs, net of hedge results (2)(3) (A)+(B) $ 110 102 (1) Includes costs associated with foreclosures, unreimbursed interest advances to investors, and other interest costs. (2) Refer to the analysis of changes in fair value MSRs presented in Table 10.1 in this Note for more detail. (3) Represents results from economic hedges used to hedge the risk of changes in fair value of MSRs. See Note 14 (Derivatives Not Designated as Hedging Instruments) for additional discussion and detail.
Analysis of Changes in Liability for Mortgage Loan Repurchase Losses	Table 10.5 summarizes the changes in our liability for mortgage loan repurchase losses. This liability is in “Accrued expenses and other liabilities” in our consolidated balance sheet and adjustments to the repurchase liability are recorded in net gains on mortgage loan origination/sales activities in “Mortgage banking” in our consolidated income statement. Because of the uncertainty in the various estimates underlying the mortgage repurchase liability, there is a range of losses in excess of the recorded mortgage repurchase liability that is reasonably possible. The estimate of the range of possible loss for representations and warranties does not represent a probable loss, and is based on currently available information, significant judgment, and a number of assumptions that are subject to change. The high end of this range of reasonably possible losses exceeded our recorded liability by $166 million at March 31, 2018 , and was determined based upon modifying the assumptions (particularly to assume significant changes in investor repurchase demand practices) used in our best estimate of probable loss to reflect what we believe to be the high end of reasonably possible adverse assumptions. Table 10.5: Analysis of Changes in Liability for Mortgage Loan Repurchase Losses Quarter ended March 31, (in millions) 2018 2017 Balance, beginning of period $ 181 229 Provision for repurchase losses: Loan sales 3 8 Change in estimate (1) 1 (8 ) Net additions to provision 4 — Losses (4 ) (7 ) Balance, end of period $ 181 222 (1) Results from changes in investor demand and mortgage insurer practices, credit deterioration and changes in the financial stability of correspondent lenders.

Intangible Assets (Tables)

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Value of Intangible Assets And Accumulated Amortization	Table 11.1 presents the gross carrying value of intangible assets and accumulated amortization. Table 11.1: Intangible Assets March 31, 2018 December 31, 2017 (in millions) Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value Amortized intangible assets (1): MSRs (2) $ 3,928 (2,517 ) 1,411 3,876 (2,452 ) 1,424 Core deposit intangibles 12,834 (12,257 ) 577 12,834 (12,065 ) 769 Customer relationship and other intangibles 3,994 (3,228 ) 766 3,994 (3,153 ) 841 Total amortized intangible assets $ 20,756 (18,002 ) 2,754 20,704 (17,670 ) 3,034 Unamortized intangible assets: MSRs (carried at fair value) (2) $ 15,041 13,625 Goodwill 26,445 26,587 Trademark 14 14 (1) Excludes fully amortized intangible assets. (2) See Note 10 (Mortgage Banking Activities) for additional information on MSRs.
Amortization Expense for Intangible Assets	Table 11.2 provides the current year and estimated future amortization expense for amortized intangible assets. We based our projections of amortization expense shown below on existing asset balances at March 31, 2018 . Future amortization expense may vary from these projections. Table 11.2: Amortization Expense for Intangible Assets (in millions) Amortized MSRs Core deposit intangibles Customer relationship and other intangibles (1) Total Three months ended March 31, 2018 (actual) $ 65 192 75 332 Estimate for the remainder of 2018 $ 202 577 223 1,002 Estimate for year ended December 31, 2019 229 — 116 345 2020 199 — 97 296 2021 172 — 82 254 2022 155 — 68 223 2023 128 — 59 187 (1) The three months ended March 31, 2018 balance includes $2 million for lease intangible amortization.
Allocation of Goodwill to Operating Segments	Table 11.3 shows the allocation of goodwill to our reportable operating segments. Table 11.3: Goodwill (in millions) Community Banking Wholesale Banking Wealth and Investment Management Consolidated Company December 31, 2016 $ 16,849 8,585 1,259 26,693 Reduction in goodwill related to divested businesses and other — (27 ) — (27 ) March 31, 2017 $ 16,849 8,558 1,259 26,666 December 31, 2017 $ 16,849 8,455 1,283 26,587 Reduction in goodwill related to divested businesses and other (142 ) — — (142 ) March 31, 2018 $ 16,707 8,455 1,283 26,445

Guarantees, Pledged Assets an43

Guarantees, Pledged Assets and Collateral (Tables)	3 Months Ended
	Mar. 31, 2018
Guarantees [Abstract]
Guarantees - Carrying Value and Maximum Exposure to Loss	Table 12.1 shows carrying value, maximum exposure to loss on our guarantees and the related non-investment grade amounts. Table 12.1: Guarantees – Carrying Value and Maximum Exposure to Loss Maximum exposure to loss (in millions) Carrying value of obligation (asset) Expires in one year or less Expires after one year through three years Expires after three years through five years Expires after five years Total Non- investment grade March 31, 2018 Standby letters of credit (1) $ 38 14,930 7,984 2,891 554 26,359 8,501 Securities lending and other indemnifications (2) — — — 2 1,028 1,030 2 Written put options (3) (227 ) 15,044 12,739 3,748 891 32,422 20,462 Loans and MHFS sold with recourse (4) 51 169 537 1,172 9,208 11,086 8,289 Factoring guarantees (5) — 814 — — — 814 715 Other guarantees 1 4 — 2 3,828 3,834 4 Total guarantees $ (137 ) 30,961 21,260 7,815 15,509 75,545 37,973 December 31, 2017 Standby letters of credit (1) $ 39 15,357 7,908 3,068 645 26,978 8,773 Securities lending and other indemnifications (2) — — — 2 809 811 2 Written put options (3) (455 ) 14,758 12,706 3,890 1,038 32,392 19,087 Loans and MHFS sold with recourse (4) 51 165 533 934 9,385 11,017 8,155 Factoring guarantees (5) — 747 — — — 747 668 Other guarantees 1 7 — 2 4,175 4,184 7 Total guarantees $ (364 ) 31,034 21,147 7,896 16,052 76,129 36,692 (1) Total maximum exposure to loss includes direct pay letters of credit (DPLCs) of $7.7 billion and $8.1 billion at March 31, 2018 , and December 31, 2017 , respectively. We issue DPLCs to provide credit enhancements for certain bond issuances. Beneficiaries (bond trustees) may draw upon these instruments to make scheduled principal and interest payments, redeem all outstanding bonds because a default event has occurred, or for other reasons as permitted by the agreement. We also originate multipurpose lending commitments under which borrowers have the option to draw on the facility in one of several forms, including as a standby letter of credit. Total maximum exposure to loss includes the portion of these facilities for which we have issued standby letters of credit under the commitments. (2) Includes indemnifications provided to certain third-party clearing agents. Outstanding customer obligations under these arrangements were $100 million and $92 million with related collateral of $929 million and $717 million at March 31, 2018 , and December 31, 2017 , respectively. Estimated maximum exposure to loss was $1.0 billion at March 31, 2018 and $809 million at December 31, 2017 . (3) Written put options, which are in the form of derivatives, are also included in the derivative disclosures in Note 14 (Derivatives). Carrying value net asset position is a result of certain deferred premium option trades. (4) Represent recourse provided, predominantly to the GSEs, on loans sold under various programs and arrangements. Under these arrangements, we repurchased $1 million of loans associated with these agreements in the first quarter 2018 , and $1 million in the same period of 2017 . (5) Consists of guarantees made under certain factoring arrangements to purchase trade receivables from third parties, generally upon their request, if receivable debtors default on their payment obligations.
Pledged Assets	Table 12.2 provides the total carrying amount of pledged assets by asset type and pledged off-balance sheet securities for securities financings. The table excludes pledged consolidated VIE assets of $13.4 billion and $13.6 billion at March 31, 2018 , and December 31, 2017 , respectively, which can only be used to settle the liabilities of those entities. The table also excludes $656 million and $675 million in assets pledged in transactions with VIE's accounted for as secured borrowings at March 31, 2018 , and December 31, 2017 , respectively. See Note 9 (Securitizations and Variable Interest Entities) for additional information on consolidated VIE assets and secured borrowings. Table 12.2: Pledged Assets (in millions) Mar 31, Dec 31, Held for trading: Debt securities $ 83,742 96,993 Equity securities 11,662 12,161 Total pledged assets held for trading (1) 95,404 109,154 Not held for trading: Debt securities and other (2) 66,739 73,592 Mortgages held for sale and loans (3) 450,605 469,554 Total pledged assets not held for trading 517,344 543,146 Total pledged assets $ 612,748 652,300 (1) Consists of pledged assets held for trading of $43.3 billion and $41.9 billion at March 31, 2018 , and December 31, 2017 , respectively and off-balance sheet securities of $52.1 billion and $67.3 billion as of the same dates, respectively, that are pledged as collateral for repurchase agreements and other securities financings. Total pledged assets held for trading includes $95.3 billion and $109.0 billion at March 31, 2018 , and December 31, 2017 , respectively that permit the secured parties to sell or repledge the collateral. (2) Includes carrying value of $4.7 billion and $5.0 billion (fair value of $4.5 billion and $ 5.0 billion ) in collateral for repurchase agreements at March 31, 2018 , and December 31, 2017 , respectively, which are pledged under agreements that do not permit the secured parties to sell or repledge the collateral. Also includes $7 million and $64 million in collateral pledged under repurchase agreements at March 31, 2018 , and December 31, 2017 , respectively, that permit the secured parties to sell or repledge the collateral. Substantially all other pledged securities are pursuant to agreements that do not permit the secured party to sell or repledge the collateral. (3) Includes mortgages held for sale of $1.0 billion and $2.6 billion at March 31, 2018 , and December 31, 2017 , respectively. Substantially all of the total mortgages held for sale and loans are pledged under agreements that do not permit the secured parties to sell or repledge the collateral. Amounts exclude $1.2 billion and $2.2 billion at March 31, 2018 , and December 31, 2017 , respectively, of pledged loans recorded on our balance sheet representing certain delinquent loans that are eligible for repurchase from GNMA loan securitizations.
Offsetting - Resale and Repurchase Agreements	Table 12.3 presents resale and repurchase agreements subject to master repurchase agreements (MRA) and securities borrowing and lending agreements subject to master securities lending agreements (MSLA). We account for transactions subject to these agreements as collateralized financings, and those with a single counterparty are presented net on our balance sheet, provided certain criteria are met that permit balance sheet netting. Most transactions subject to these agreements do not meet those criteria and thus are not eligible for balance sheet netting. Collateral we pledged consists of non-cash instruments, such as securities or loans, and is not netted on the balance sheet against the related liability. Collateral we received includes securities or loans and is not recognized on our balance sheet. Collateral pledged or received may be increased or decreased over time to maintain certain contractual thresholds as the assets underlying each arrangement fluctuate in value. Generally, these agreements require collateral to exceed the asset or liability recognized on the balance sheet. The following table includes the amount of collateral pledged or received related to exposures subject to enforceable MRAs or MSLAs. While these agreements are typically over-collateralized, U.S. GAAP requires disclosure in this table to limit the reported amount of such collateral to the amount of the related recognized asset or liability for each counterparty. In addition to the amounts included in Table 12.3 , we also have balance sheet netting related to derivatives that is disclosed in Note 14 (Derivatives). Table 12.3: Offsetting – Resale and Repurchase Agreements (in millions) Mar 31, Dec 31, Assets: Resale and securities borrowing agreements Gross amounts recognized $ 108,479 121,135 Gross amounts offset in consolidated balance sheet (1) (16,574 ) (23,188 ) Net amounts in consolidated balance sheet (2) 91,905 97,947 Collateral not recognized in consolidated balance sheet (3) (91,396 ) (96,829 ) Net amount (4) $ 509 1,118 Liabilities: Repurchase and securities lending agreements Gross amounts recognized (5) $ 96,911 111,488 Gross amounts offset in consolidated balance sheet (1) (16,574 ) (23,188 ) Net amounts in consolidated balance sheet (6) 80,337 88,300 Collateral pledged but not netted in consolidated balance sheet (7) (80,193 ) (87,918 ) Net amount (8) $ 144 382 (1) Represents recognized amount of resale and repurchase agreements with counterparties subject to enforceable MRAs that have been offset in the consolidated balance sheet. (2) At March 31, 2018 , and December 31, 2017 , includes $73.5 billion and $78.9 billion , respectively, classified on our consolidated balance sheet in federal funds sold and securities purchased under resale agreements. Balance also includes securities purchased under long-term resale agreements (generally one year or more) classified in loans, which totaled $18.4 billion and $19.0 billion , at March 31, 2018 , and December 31, 2017 , respectively. (3) Represents the fair value of collateral we have received under enforceable MRAs or MSLAs, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. At March 31, 2018 , and December 31, 2017 , we have received total collateral with a fair value of $118.2 billion and $130.8 billion , respectively, all of which, we have the right to sell or repledge. These amounts include securities we have sold or repledged to others with a fair value of $52.7 billion at March 31, 2018 , and $66.3 billion at December 31, 2017 . (4) Represents the amount of our exposure that is not collateralized and/or is not subject to an enforceable MRA or MSLA. (5) For additional information on underlying collateral and contractual maturities, see the “Repurchase and Securities Lending Agreements” section in this Note. (6) Amount is classified in short-term borrowings on our consolidated balance sheet. (7) Represents the fair value of collateral we have pledged, related to enforceable MRAs or MSLAs, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty. At March 31, 2018 , and December 31, 2017 , we have pledged total collateral with a fair value of $99.2 billion and $113.6 billion , respectively, of which, the counterparty does not have the right to sell or repledge $4.7 billion as of March 31, 2018 and $5.2 billion as of December 31, 2017 . (8) Represents the amount of our obligation that is not covered by pledged collateral and/or is not subject to an enforceable MRA or MSLA.
Underlying Collateral Types of Gross Obligations and Contractual Maturities of Gross Obligations	Table 12.4 provides the underlying collateral types of our gross obligations under repurchase and securities lending agreements. Table 12.4: Underlying Collateral Types of Gross Obligations (in millions) Mar 31, Dec 31, Repurchase agreements: Securities of U.S. Treasury and federal agencies $ 42,646 51,144 Securities of U.S. States and political subdivisions 29 92 Federal agency mortgage-backed securities 33,138 35,386 Non-agency mortgage-backed securities 1,194 1,324 Corporate debt securities 6,092 7,152 Asset-backed securities 2,121 2,034 Equity securities 826 838 Other 66 1,783 Total repurchases 86,112 99,753 Securities lending: Securities of U.S. Treasury and federal agencies 102 186 Federal agency mortgage-backed securities 1 — Corporate debt securities 471 619 Equity securities (1) 10,225 10,930 Total securities lending 10,799 11,735 Total repurchases and securities lending $ 96,911 111,488 (1) Equity securities are generally exchange traded and either re-hypothecated under margin lending agreements or obtained through contemporaneous securities borrowing transactions with other counterparties. Table 12.5 provides the contractual maturities of our gross obligations under repurchase and securities lending agreements. Table 12.5: Contractual Maturities of Gross Obligations (in millions) Overnight/continuous Up to 30 days 30-90 days >90 days Total gross obligation March 31, 2018 Repurchase agreements $ 72,474 5,142 3,401 5,095 86,112 Securities lending 10,178 — 621 — 10,799 Total repurchases and securities lending (1) $ 82,652 5,142 4,022 5,095 96,911 December 31, 2017 Repurchase agreements $ 83,780 7,922 3,286 4,765 99,753 Securities lending 9,634 584 1,363 154 11,735 Total repurchases and securities lending (1) $ 93,414 8,506 4,649 4,919 111,488 (1) Securities lending is executed under agreements that allow either party to terminate the transaction without notice, while repurchase agreements have a term structure to them that technically matures at a point in time. The overnight/continuous repurchase agreements require election of both parties to roll the trade rather than the election to terminate the arrangement as in securities lending.

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional or Contractual Amounts and Fair Values of Derivatives	Table 14.1 presents the total notional or contractual amounts and fair values for our derivatives. Derivative transactions can be measured in terms of the notional amount, but this amount is not recorded on the balance sheet and is not, when viewed in isolation, a meaningful measure of the risk profile of the instruments. The notional amount is generally not exchanged but is used only as the basis on which interest and other payments are determined. Table 14.1: Notional or Contractual Amounts and Fair Values of Derivatives March 31, 2018 December 31, 2017 Notional or contractual amount Fair value Notional or contractual amount Fair value (in millions) Derivative assets Derivative liabilities Derivative Derivative Derivatives designated as hedging instruments Interest rate contracts (1) $ 165,802 2,387 724 209,677 2,492 1,092 Foreign exchange contracts (1) 31,720 1,769 742 34,135 1,482 1,137 Total derivatives designated as qualifying hedging instruments 4,156 1,466 3,974 2,229 Derivatives not designated as hedging instruments Economic hedges: Interest rate contracts (2) 197,432 287 416 220,558 159 201 Equity contracts 12,978 1,058 69 12,315 716 138 Foreign exchange contracts 15,373 84 205 15,976 78 309 Credit contracts – protection purchased 211 42 — 111 37 — Subtotal 1,471 690 990 648 Customer accommodation trading and other derivatives: Interest rate contracts 7,560,715 14,173 14,855 6,434,673 14,979 14,179 Commodity contracts 70,455 2,575 1,457 62,530 2,354 1,335 Equity contracts 231,036 6,765 7,708 213,750 6,291 8,363 Foreign exchange contracts 349,850 6,885 6,140 362,896 7,413 7,122 Credit contracts – protection sold 8,826 118 197 9,021 147 214 Credit contracts – protection purchased 17,559 191 159 17,406 207 208 Subtotal 30,707 30,516 31,391 31,421 Total derivatives not designated as hedging instruments 32,178 31,206 32,381 32,069 Total derivatives before netting 36,334 32,672 36,355 34,298 Netting (3) (24,867 ) (24,789 ) (24,127 ) (25,502 ) Total $ 11,467 7,883 12,228 8,796 (1) Notional amounts presented exclude $0 million and $500 million of interest rate contracts at March 31, 2018 , and December 31, 2017 , respectively, for certain derivatives that are combined for designation as a hedge on a single instrument. The notional amount for foreign exchange contracts at March 31, 2018 , and December 31, 2017 , excludes $12.0 billion and $13.5 billion , respectively, for certain derivatives that are combined for designation as a hedge on a single instrument. (2) Includes economic hedge derivatives used to hedge the risk of changes in the fair value of residential MSRs, MHFS, loans, derivative loan commitments and other interests held. (3) Represents balance sheet netting of derivative asset and liability balances, related cash collateral and portfolio level counterparty valuation adjustments. See Table 14.2 for further information.
Gross Fair Values of Derivative Assets and Liabilities	Table 14.2 provides information on the gross fair values of derivative assets and liabilities, the balance sheet netting adjustments and the resulting net fair value amount recorded on our balance sheet, as well as the non-cash collateral associated with such arrangements. We execute substantially all of our derivative transactions under master netting arrangements and reflect all derivative balances and related cash collateral subject to enforceable master netting arrangements on a net basis within the balance sheet. The “Gross amounts recognized” column in the following table includes $31.8 billion and $29.6 billion of gross derivative assets and liabilities, respectively, at March 31, 2018 , and $30.0 billion and $29.9 billion , respectively, at December 31, 2017 , with counterparties subject to enforceable master netting arrangements that are carried on the balance sheet net of offsetting amounts. The remaining gross derivative assets and liabilities of $4.5 billion and $3.1 billion , respectively, at March 31, 2018 , and $6.4 billion and $4.4 billion , respectively, at December 31, 2017 , include those with counterparties subject to master netting arrangements for which we have not assessed the enforceability because they are with counterparties where we do not currently have positions to offset, those subject to master netting arrangements where we have not been able to confirm the enforceability and those not subject to master netting arrangements. As such, we do not net derivative balances or collateral within the balance sheet for these counterparties. We determine the balance sheet netting adjustments based on the terms specified within each master netting arrangement. We disclose the balance sheet netting amounts within the column titled “Gross amounts offset in consolidated balance sheet.” Balance sheet netting adjustments are determined at the counterparty level for which there may be multiple contract types. For disclosure purposes, we allocate these netting adjustments to the contract type for each counterparty proportionally based upon the “Gross amounts recognized” by counterparty. As a result, the net amounts disclosed by contract type may not represent the actual exposure upon settlement of the contracts. We do not net non-cash collateral that we receive and pledge on the balance sheet. For disclosure purposes, we present the fair value of this non-cash collateral in the column titled “Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)” within the table. We determine and allocate the Disclosure-only netting amounts in the same manner as balance sheet netting amounts. The “Net amounts” column within Table 14.2 represents the aggregate of our net exposure to each counterparty after considering the balance sheet and Disclosure-only netting adjustments. We manage derivative exposure by monitoring the credit risk associated with each counterparty using counterparty specific credit risk limits, using master netting arrangements and obtaining collateral. Derivative contracts executed in over-the-counter markets include bilateral contractual arrangements that are not cleared through a central clearing organization but are typically subject to master netting arrangements. The percentage of our bilateral derivative transactions outstanding at period end in such markets, based on gross fair value, is provided within the following table. Other derivative contracts executed in over-the-counter or exchange-traded markets are settled through a central clearing organization and are excluded from this percentage. In addition to the netting amounts included in the table, we also have balance sheet netting related to resale and repurchase agreements that are disclosed within Note 12 (Guarantees, Pledged Assets and Collateral, and Other Commitments). Table 14.2: Gross Fair Values of Derivative Assets and Liabilities (in millions) Gross amounts recognized Gross amounts offset in consolidated balance sheet (1) Net amounts in consolidated balance sheet Gross amounts not offset in consolidated balance sheet (Disclosure-only netting) (2) Net amounts Percent exchanged in over-the-counter market (3) March 31, 2018 Derivative assets Interest rate contracts $ 16,847 (11,407 ) 5,440 (91 ) 5,349 98 % Commodity contracts 2,575 (1,032 ) 1,543 (3 ) 1,540 87 Equity contracts 7,823 (5,997 ) 1,826 (559 ) 1,267 77 Foreign exchange contracts 8,738 (6,134 ) 2,604 (226 ) 2,378 100 Credit contracts – protection sold 118 (115 ) 3 — 3 11 Credit contracts – protection purchased 233 (182 ) 51 (1 ) 50 89 Total derivative assets $ 36,334 (24,867 ) 11,467 (880 ) 10,587 Derivative liabilities Interest rate contracts $ 15,995 (12,449 ) 3,546 (755 ) 2,791 97 % Commodity contracts 1,457 (744 ) 713 — 713 69 Equity contracts 7,777 (5,220 ) 2,557 (247 ) 2,310 82 Foreign exchange contracts 7,087 (6,035 ) 1,052 (124 ) 928 100 Credit contracts – protection sold 197 (192 ) 5 (5 ) — 84 Credit contracts – protection purchased 159 (149 ) 10 — 10 9 Total derivative liabilities $ 32,672 (24,789 ) 7,883 (1,131 ) 6,752 December 31, 2017 Derivative assets Interest rate contracts $ 17,630 (11,929 ) 5,701 (145 ) 5,556 99 % Commodity contracts 2,354 (966 ) 1,388 (4 ) 1,384 88 Equity contracts 7,007 (4,233 ) 2,774 (596 ) 2,178 76 Foreign exchange contracts 8,973 (6,656 ) 2,317 (25 ) 2,292 100 Credit contracts – protection sold 147 (145 ) 2 — 2 10 Credit contracts – protection purchased 244 (198 ) 46 (3 ) 43 89 Total derivative assets $ 36,355 (24,127 ) 12,228 (773 ) 11,455 Derivative liabilities Interest rate contracts $ 15,472 (13,226 ) 2,246 (1,078 ) 1,168 99 % Commodity contracts 1,335 (648 ) 687 (1 ) 686 76 Equity contracts 8,501 (4,041 ) 4,460 (400 ) 4,060 85 Foreign exchange contracts 8,568 (7,189 ) 1,379 (204 ) 1,175 100 Credit contracts – protection sold 214 (204 ) 10 (9 ) 1 85 Credit contracts – protection purchased 208 (194 ) 14 — 14 9 Total derivative liabilities $ 34,298 (25,502 ) 8,796 (1,692 ) 7,104 (1) Represents amounts with counterparties subject to enforceable master netting arrangements that have been offset in the consolidated balance sheet, including related cash collateral and portfolio level counterparty valuation adjustments. Counterparty valuation adjustments were $283 million and $245 million related to derivative assets and $132 million and $95 million related to derivative liabilities at March 31, 2018 , and December 31, 2017 , respectively. Cash collateral totaled $3.7 billion and $3.7 billion , netted against derivative assets and liabilities, respectively, at March 31, 2018 , and $2.7 billion and $4.2 billion , respectively, at December 31, 2017 . (2) Represents the fair value of non-cash collateral pledged and received against derivative assets and liabilities with the same counterparty that are subject to enforceable master netting arrangements. U.S. GAAP does not permit netting of such non-cash collateral balances in the consolidated balance sheet but requires disclosure of these amounts. (3) Represents derivatives executed in over-the-counter markets that are not settled through a central clearing organization. Over-the-counter percentages are calculated based on gross amounts recognized as of the respective balance sheet date. The remaining percentage represents derivatives settled through a central clearing organization, which are executed in either over-the-counter or exchange-traded markets.
Derivatives in Fair Value and Cash Flow Hedging Relationships	Table 14.3 shows the net gains (losses) related to derivatives in fair value and cash flow hedging relationships. Table 14.3: Gains (Losses) Recognized in Consolidated Statement of Income on Fair Value and Cash Flow Hedging Relationships Net interest income Noninterest Income (in millions) Debt securities Loans Mortgages held for sale Deposits Long-term debt Other Total Quarter ended March 31, 2018 Total amounts presented in the consolidated statement of income $ 3,414 10,579 179 (1,090 ) (1,576 ) 602 12,108 Gains (losses) on fair value hedging relationships Interest contracts Amounts related to interest settlements on derivatives (1) (82 ) — (1 ) (5 ) 171 — 83 Recognized on derivatives 950 1 6 (149 ) (2,393 ) — (1,585 ) Recognized on hedged items (968 ) (1 ) (8 ) 141 2,334 — 1,498 Foreign exchange contracts Amounts related to interest settlements on derivatives (1)(2) 5 — — — (80 ) — (75 ) Recognized on derivatives (3) 4 — — — (171 ) 660 493 Recognized on hedged items (3 ) — — — 109 (627 ) (521 ) Net income (expense) recognized on fair value hedges (94 ) — (3 ) (13 ) (30 ) 33 (107 ) Gains (losses) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from cumulative OCI into net income (4) — (60 ) — — — — (60 ) Net income (expense) recognized on cash flow hedges $ — (60 ) — — — — (60 ) (continued on following page) (continued from previous page) Net interest income Noninterest Income (in millions) Debt securities Loans Mortgages held for sale Deposits Long-term debt Other Total Quarter ended March 31, 2017 Total amounts of line items presented in the consolidated statement of income $ 3,173 10,141 182 (536 ) (1,147 ) 374 12,187 Gains (losses) on fair value hedging relationships Interest contracts Amounts related to interest settlements on derivatives (1) (131 ) (1 ) (1 ) 12 415 — 294 Recognized on derivatives 126 1 (2 ) (8 ) (556 ) — (439 ) Recognized on hedged items (141 ) (1 ) — 10 556 — 424 Foreign exchange contracts Amounts related to interest settlements on derivatives (1)(2) 4 — — — (33 ) — (29 ) Recognized on derivatives (3) 6 — — — (47 ) 375 334 Recognized on hedged items (3 ) — — — 83 (340 ) (260 ) Net income (expense) recognized on fair value hedges (139 ) (1 ) (3 ) 14 418 35 324 Gains (losses) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from cumulative OCI into net income (4) — 205 — — (3 ) — 202 Net income (expense) recognized on cash flow hedges $ — 205 — — (3 ) — 202 (1) Includes $7 million and $5 million for first quarter 2018 and 2017, respectively, which represents changes in fair value due to the passage of time associated with the non-zero fair value amount at hedge inception. (2) Includes $0 million , and $(1) million for first quarter 2018 and 2017, respectively, of the time value component recognized as net interest income (expense) on forward derivatives hedging foreign currency debt securities and long-term debt that were excluded from the assessment of hedge effectiveness. (3) For certain fair value hedges of foreign currency risk, changes in fair value of cross-currency swaps attributable to changes in cross-currency basis spreads are excluded from the assessment of hedge effectiveness and recorded in other comprehensive income. See Note 20 (Other Comprehensive Income) for the amounts recognized in other comprehensive income. (4) See Note 20 (Other Comprehensive Income) for details of amounts reclassified to net income.
Hedged Items in Fair Value Hedging Relationships	Table 14.4 shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. Table 14.4: Hedged Items in Fair Value Hedging Relationship Hedged Items Currently Designated Hedged Items No Longer Designated (1) (in millions) Carrying Amount of Assets/(Liabilities) (2)(4) Hedge Accounting Basis Adjustment Assets/(Liabilities) (3) Carrying Amount of Assets/(Liabilities) (4) Hedge Accounting Basis Adjustment March 31, 2018 Available-for-sale debt securities (5) $ 31,023 (301 ) 4,916 288 Loans 135 (1 ) — — Mortgages held for sale 822 1 — — Deposits (29,564 ) 298 — — Long-term debt (125,876 ) 265 (805 ) 13 December 31, 2017 Available-for-sale debt securities (5) 32,498 870 5,221 343 Loans 140 (1 ) — — Mortgages held for sale 465 (1 ) — — Deposits (23,679 ) 158 — — Long-term debt (128,950 ) (2,154 ) (1,953 ) 16 (1) Represents hedged items no longer designated in qualifying fair value hedging relationships for which an associated basis adjustment exists at the balance sheet date. (2) Does not include the carrying amount of hedged items where only foreign currency risk is the designated hedged risk. The carrying amount excluded for debt securities is $1.5 billion and $(7.4) billion for long-term debt as of March 31, 2018 and $1.5 billion for debt securities and for long-term debt is $(7.7) billion as of December 31, 2017. (3) The balance includes $1.7 billion and $266 million of debt securities and long-term debt cumulative basis adjustments as of March 31, 2018, respectively, and $2.1 billion and $297 million of debt securities and long-term debt cumulative basis adjustments, respectively as of December 31, 2017, on terminated hedges whereby the hedged items have subsequently been re-designated into existing hedges. (4) Represents the full carrying amount of the hedged asset or liability item as of the balance sheet date, except for circumstances in which only a portion of the asset or liability was designated as the hedged item in which case only the portion designated is presented. (5) Carrying amount represents the amortized cost.
Derivatives Not Designated as Hedging Instruments	Table 14.5 shows the net gains (losses) recognized by income statement lines, related to derivatives not designated as hedging instruments. Table 14.5: Gains (Losses) on Derivatives Not Designated as Hedging Instruments Noninterest income (in millions) Mortgage banking Net gains (losses) from equity securities Net gains (losses) from trading activities Other Total Quarter ended March 31, 2018 Net gains (losses) recognized on economic hedges derivatives: Interest contracts (1) $ (595 ) — — 9 (586 ) Equity contracts — (58 ) — — (58 ) Foreign exchange contracts — — — (159 ) (159 ) Credit contracts — — — 4 4 Subtotal (2) (595 ) (58 ) — (146 ) (799 ) Net gains (losses) recognized on customer accommodation trading and other derivatives: Interest contracts (3) (259 ) — 385 — 126 Equity contracts — — 459 (195 ) 264 Foreign exchange contracts — — 310 — 310 Credit contracts — — 10 — 10 Commodity contracts — — 39 — 39 Other — — — — — Subtotal (259 ) — 1,203 (195 ) 749 Net gains (losses) recognized related to derivatives not designated as hedging instruments $ (854 ) (58 ) 1,203 (341 ) (50 ) (continued on following page) (continued from previous page) Noninterest income (in millions) Mortgage banking Net gains (losses) from equity securities Net gains (losses) from trading activities Other Total Quarter ended March 31, 2017 Net gains (losses) recognized on economic hedges derivatives: Interest contracts (1) $ (9 ) — — 6 (3 ) Equity contracts — (474 ) — (7 ) (481 ) Foreign exchange contracts — — — (87 ) (87 ) Credit contracts — — — 4 4 Subtotal (2) (9 ) (474 ) — (84 ) (567 ) Net gains (losses) recognized on customer accommodation trading and other derivatives: Interest contracts (3) 193 — 45 — 238 Equity contracts — — (1,109 ) — (1,109 ) Foreign exchange contracts — — 179 — 179 Credit contracts — — (15 ) — (15 ) Commodity contracts — — 60 — 60 Other — — 12 — 12 Subtotal 193 — (828 ) — (635 ) Net gains (losses) recognized related to derivatives not designated as hedging instruments $ 184 (474 ) (828 ) (84 ) (1,202 ) (1) Includes gains (losses) on the derivatives used as economic hedges of MSRs measured at fair value, interest rate lock commitments and mortgages held for sale. (2) Includes hedging gains of $28 million and $2 million for first quarter 2018 and 2017, respectively, which partially offset hedge accounting ineffectiveness. (3) Amounts presented in mortgage banking noninterest income are gains on interest rate lock commitments.
Sold and Purchased Credit Derivatives	Table 14.6 provides details of sold and purchased credit derivatives. Table 14.6: Sold and Purchased Credit Derivatives Notional amount (in millions) Fair value liability Protection sold (A) Protection sold – non- investment grade Protection purchased with identical underlyings (B) Net protection sold (A) - (B) Other protection purchased Range of maturities March 31, 2018 Credit default swaps on: Corporate bonds $ 34 2,152 531 1,669 483 988 2018 - 2027 Structured products 78 184 179 166 18 124 2022 - 2047 Credit protection on: Default swap index — 2,225 525 395 1,830 3,458 2018 - 2028 Commercial mortgage-backed securities index 75 444 164 421 23 47 2047 - 2058 Asset-backed securities index 10 43 43 43 — 1 2045 - 2046 Other — 3,778 3,674 — 3,778 10,458 2018 - 2031 Total credit derivatives $ 197 8,826 5,116 2,694 6,132 15,076 December 31, 2017 Credit default swaps on: Corporate bonds $ 35 2,007 510 1,575 432 946 2018 - 2027 Structured products 86 267 252 232 35 153 2022 - 2047 Credit protection on: Default swap index — 2,626 540 308 2,318 3,932 2018 - 2027 Commercial mortgage-backed securities index 83 423 — 401 22 87 2047 - 2058 Asset-backed securities index 9 42 — 42 — 1 2045 - 2046 Other 1 3,656 3,306 — 3,656 9,840 2018 - 2031 Total credit derivatives $ 214 9,021 4,608 2,558 6,463 14,959

Fair Values of Assets and Lia45

Fair Values of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value, Measurements from Brokers or Third Party Pricing Services	Table 15.1: Fair Value Measurements by Brokers or Third-Party Pricing Services Brokers Third-party pricing services (in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 March 31, 2018 Trading debt securities $ — — — 105 229 — Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies — — — 3,362 2,917 — Securities of U.S. states and political subdivisions — — — — 47,951 44 Mortgage-backed securities — 33 — — 165,656 67 Other debt securities (1) — 231 1,077 — 46,288 139 Total available-for-sale debt securities — 264 1,077 3,362 262,812 250 Equity securities: Marketable — — — — 225 — Nonmarketable — — — — 2 293 Total equity securities — — — — 227 293 Derivative assets — — — 17 — — Derivative liabilities — — — (17 ) — — Other liabilities (2) — — — — — — December 31, 2017 Trading debt securities $ — — — 926 215 — Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies — — — 3,389 2,930 — Securities of U.S. states and political subdivisions — — — — 50,401 49 Mortgage-backed securities — 33 — — 168,948 75 Other debt securities (1) — 307 1,158 — 44,465 22 Total available-for-sale debt securities — 340 1,158 3,389 266,744 146 Equity securities: Marketable — — — — 227 — Nonmarketable — — — — — — Total equity securities — — — — 227 — Derivative assets — — — 19 — — Derivative liabilities — — — (19 ) — — Other liabilities (2) — — — — — — (1) Includes corporate debt securities, collateralized loan and other debt obligations, asset-backed securities, and other debt securities. (2) Includes short sale liabilities and other liabilities.
Assets and Liabilities Recorded at Fair Value on a Recurring Basis	Table 15.2 presents the balances of assets and liabilities recorded at fair value on a recurring basis. Table 15.2: Fair Value on a Recurring Basis (in millions) Level 1 Level 2 Level 3 Netting Total March 31, 2018 Trading debt securities: Securities of U.S. Treasury and federal agencies $ 13,419 2,720 — — 16,139 Securities of U.S. states and political subdivisions — 3,434 3 — 3,437 Collateralized loan obligations — 645 316 — 961 Corporate debt securities — 12,377 34 — 12,411 Mortgage-backed securities — 25,755 — — 25,755 Asset-backed securities — 1,132 — — 1,132 Other trading debt securities — 13 18 — 31 Total trading debt securities 13,419 46,076 371 — 59,866 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies 3,362 2,917 — — 6,279 Securities of U.S. states and political subdivisions — 49,026 617 — 49,643 Mortgage-backed securities: Federal agencies — 156,814 — — 156,814 Residential — 4,473 1 — 4,474 Commercial — 4,723 67 — 4,790 Total mortgage-backed securities — 166,010 68 — 166,078 Corporate debt securities 54 6,719 410 — 7,183 Collateralized loan and other debt obligations (1) — 35,707 1,045 — 36,752 Asset-backed securities: Automobile loans and leases — 572 — — 572 Home equity loans — 146 — — 146 Other asset-backed securities — 4,501 501 — 5,002 Total asset-backed securities — 5,219 501 — 5,720 Other debt securities — 1 — — 1 Total available-for-sale debt securities 3,416 265,599 2,641 (2) — 271,656 Mortgages held for sale — 12,909 950 — 13,859 Loans held for sale — 1,695 — — 1,695 Loans — — 352 — 352 Mortgage servicing rights (residential) — — 15,041 — 15,041 Derivative assets: Interest rate contracts 20 16,728 99 — 16,847 Commodity contracts — 2,547 28 — 2,575 Equity contracts 1,795 4,562 1,466 — 7,823 Foreign exchange contracts 17 8,707 14 — 8,738 Credit contracts — 231 120 — 351 Netting — — — (24,867 ) (3) (24,867 ) Total derivative assets 1,832 32,775 1,727 (24,867 ) 11,467 Equity securities - excluding securities at NAV: Marketable 29,705 553 — — 30,258 Nonmarketable — 52 5,219 — 5,271 Total equity securities $ 29,705 605 5,219 — 35,529 Total assets included in the fair value hierarchy $ 48,372 359,659 26,301 (24,867 ) 409,465 Equity securities at NAV (4) 32 Total assets recorded at fair value $ 409,497 Derivative liabilities: Interest rate contracts $ (20 ) (15,868 ) (107 ) — (15,995 ) Commodity contracts — (1,439 ) (18 ) — (1,457 ) Equity contracts (1,391 ) (4,598 ) (1,788 ) — (7,777 ) Foreign exchange contracts (17 ) (7,057 ) (13 ) — (7,087 ) Credit contracts — (277 ) (79 ) — (356 ) Netting — — — 24,789 (3) 24,789 Total derivative liabilities (1,428 ) (29,239 ) (2,005 ) 24,789 (7,883 ) Short sale liabilities: Securities of U.S. Treasury and federal agencies (14,243 ) (570 ) — — (14,813 ) Mortgage back securities — (18 ) — — (18 ) Corporate debt securities — (5,962 ) — — (5,962 ) Equity securities (2,459 ) (51 ) — — (2,510 ) Other securities — — — — — Total short sale liabilities (16,702 ) (6,601 ) — — (23,303 ) Other liabilities — — (2 ) — (2 ) Total liabilities recorded at fair value $ (18,130 ) (35,840 ) (2,007 ) 24,789 (31,188 ) (1) Includes collateralized debt obligations of $1.0 billion . (2) Balance primarily consists of securities that are investment grade based on ratings received from the ratings agencies or internal credit grades categorized as investment grade if external ratings are not available. The securities are classified as Level 3 due to limited market activity. (3) Represents balance sheet netting of derivative asset and liability balances and related cash collateral. See Note 14 (Derivatives) for additional information. (4) Consists of certain nonmarketable equity securities that are measured at fair value using NAV per share (or its equivalent) as a practical expedient and are excluded from the fair value hierarchy. (continued on following page) (continued from previous page) (in millions) Level 1 Level 2 Level 3 Netting Total December 31, 2017 Trading debt securities: Securities of U.S. Treasury and federal agencies $ 12,491 2,383 — — 14,874 Securities of U.S. states and political subdivisions — 3,732 3 — 3,735 Collateralized loan obligations — 565 354 — 919 Corporate debt securities — 11,760 31 — 11,791 Mortgage-backed securities — 25,273 — — 25,273 Asset-backed securities — 993 — — 993 Other trading debt securities — 20 19 — 39 Total trading debt securities 12,491 44,726 407 — 57,624 Available-for-sale debt securities: Securities of U.S. Treasury and federal agencies 3,389 2,930 — — 6,319 Securities of U.S. states and political subdivisions — 50,401 925 — 51,326 Mortgage-backed securities: Federal agencies — 160,219 — — 160,219 Residential — 4,607 1 — 4,608 Commercial — 4,490 75 — 4,565 Total mortgage-backed securities — 169,316 76 — 169,392 Corporate debt securities 56 7,203 407 — 7,666 Collateralized loan and other debt obligations (1) — 35,036 1,020 — 36,056 Asset-backed securities: Automobile loans and leases — 553 — — 553 Home equity loans — 149 — — 149 Other asset-backed securities — 4,380 566 — 4,946 Total asset-backed securities — 5,082 566 — 5,648 Other debt securities — — — — — Total available-for-sale debt securities 3,445 269,968 2,994 (2) — 276,407 Mortgages held for sale — 15,118 998 — 16,116 Loans held for sale — 1,009 14 — 1,023 Loans — — 376 — 376 Mortgage servicing rights (residential) — — 13,625 — 13,625 Derivative assets: Interest rate contracts 17 17,479 134 — 17,630 Commodity contracts — 2,318 36 — 2,354 Equity contracts 1,698 3,970 1,339 — 7,007 Foreign exchange contracts 19 8,944 10 — 8,973 Credit contracts — 269 122 — 391 Netting — — — (24,127 ) (3) (24,127 ) Total derivative assets 1,734 32,980 1,641 (24,127 ) 12,228 Equity securities - excluding securities at NAV: Marketable 33,931 429 — — 34,360 Nonmarketable — 46 4,821 — 4,867 Total equity securities $ 33,931 475 4,821 — 39,227 Total assets included in the fair value hierarchy $ 51,601 364,276 24,876 (24,127 ) 416,626 Equity securities at NAV (4) — Total assets recorded at fair value $ 416,626 Derivative liabilities: Interest rate contracts $ (17 ) (15,392 ) (63 ) — (15,472 ) Commodity contracts — (1,318 ) (17 ) — (1,335 ) Equity contracts (1,313 ) (5,338 ) (1,850 ) — (8,501 ) Foreign exchange contracts (19 ) (8,546 ) (3 ) — (8,568 ) Credit contracts — (336 ) (86 ) — (422 ) Netting — — — 25,502 (3) 25,502 Total derivative liabilities (1,349 ) (30,930 ) (2,019 ) 25,502 (8,796 ) Short sale liabilities: Securities of U.S. Treasury and federal agencies (10,420 ) (568 ) — — (10,988 ) Corporate debt securities — (4,986 ) — — (4,986 ) Equity securities (2,168 ) (45 ) — — (2,213 ) Other securities — (285 ) — — (285 ) Total short sale liabilities (12,588 ) (5,884 ) — — (18,472 ) Other liabilities — — (3 ) — (3 ) Total liabilities recorded at fair value $ (13,937 ) (36,814 ) (2,022 ) 25,502 (27,271 ) (1) Includes collateralized debt obligations of $1.0 billion . (2) Balance primarily consists of securities that are investment grade based on ratings received from the ratings agencies or internal credit grades categorized as investment grade if external ratings are not available. The securities are classified as Level 3 due to limited market activity. (3) Represents balance sheet netting of derivative asset and liability balances and related cash collateral. See Note 14 (Derivatives) for additional information. (4) Consists of certain nonmarketable equity securities that are measured at fair value using NAV per share (or its equivalent) as a practical expedient and are excluded from the fair value hierarchy.
Fair Value, Transfers Between Fair Value Levels	Transfers into and out of Level 1, Level 2, and Level 3 are provided within Table 15.3 for the periods presented. The amounts reported as transfers represent the fair value as of the beginning of the quarter in which the transfer occurred. Table 15.3: Transfers Between Fair Value Levels Transfers Between Fair Value Levels Level 1 Level 2 Level 3 (1) (in millions) In Out In Out In Out Total Quarter ended March 31, 2018 Trading debt securities $ — — — — — — — Available-for-sale debt securities — — 269 — — (269 ) — Mortgages held for sale — — 3 (15 ) 15 (3 ) — Loans held for sale — — — — — — — Equity securities — (11 ) 11 (4 ) 4 — — Net derivative assets and liabilities (2) — — (49 ) — — 49 — Short sale liabilities — — — — — — — Total transfers $ — (11 ) 234 (19 ) 19 (223 ) — Quarter ended March 31, 2017 Trading debt securities $ — — 1 (3 ) 3 (1 ) — Available-for-sale debt securities — — 72 (5 ) 5 (72 ) — Mortgages held for sale — — 1 (42 ) 42 (1 ) — Loans held for sale — — — — — — — Equity securities — — — — — — — Net derivative assets and liabilities (2) — — 3 22 (22 ) (3 ) — Short sale liabilities — — — — — — — Total transfers $ — — 77 (28 ) 28 (77 ) — (1) All transfers in and out of Level 3 are disclosed within the recurring Level 3 rollforward tables in this Note. (2) Includes transfers of net derivative assets and net derivative liabilities between levels due to changes in observable market data.
Fair Value, Assets and Liabilities Measured on Recurring Basis, Level 3 Reconciliation	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2018 , are presented in Table 15.4 . Table 15.4: Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis – Quarter ended ended March 31, 2018 Total net gains (losses) included in Purchases, sales, issuances and settlements, net (1) Net unrealized gains (losses) included in income related to assets and liabilities held at period end (in millions) Balance, beginning of period Net income Other compre- hensive income Transfers into Level 3 Transfers out of Level 3 Balance, end of period (2) Quarter ended March 31, 2018 Trading debt securities: Securities of U.S. states and political subdivisions $ 3 — — — — — 3 — Collateralized loan obligations 354 2 — (40 ) — — 316 16 Corporate debt securities 31 — — 3 — — 34 — Mortgage-backed securities — — — — — — — — Asset-backed securities — — — — — — — — Other trading debt securities 19 (1 ) — — — — 18 — Total trading debt securities 407 1 — (37 ) — — 371 16 (3) Available-for-sale debt securities: Securities of U.S. states and political subdivisions 925 4 (2 ) (41 ) — (269 ) 617 — Mortgage-backed securities: Residential 1 — — — — — 1 — Commercial 75 1 (1 ) (8 ) — — 67 — Total mortgage-backed securities 76 1 (1 ) (8 ) — — 68 — Corporate debt securities 407 1 3 (1 ) — — 410 — Collateralized loan and other debt obligations 1,020 5 43 (23 ) — — 1,045 — Asset-backed securities: Automobile loans and leases — — — — — — — — Other asset-backed securities 566 8 (7 ) (66 ) — — 501 — Total asset-backed securities 566 8 (7 ) (66 ) — — 501 — Total available-for-sale debt securities 2,994 19 36 (139 ) — (269 ) 2,641 — (4) Mortgages held for sale 998 (23 ) — (37 ) 15 (3 ) 950 (23 ) (5) Loans held for sale 14 2 — (16 ) — — — — Loans 376 (1 ) — (23 ) — — 352 (4 ) (5) Mortgage servicing rights (residential) (6) 13,625 847 — 569 — — 15,041 1,330 (5) Net derivative assets and liabilities: Interest rate contracts 71 (345 ) — 266 — — (8 ) (73 ) Commodity contracts 19 15 — (24 ) — — 10 — Equity contracts (511 ) 69 — 71 — 49 (322 ) 25 Foreign exchange contracts 7 (7 ) — 1 — — 1 (3 ) Credit contracts 36 8 — (3 ) — — 41 4 Other derivative contracts — — — — — — — — Total derivative contracts (378 ) (260 ) — 311 — 49 (278 ) (47 ) (7) Equity securities: Marketable — — — — — — — — Nonmarketable (8) 5,203 108 — (96 ) 4 — 5,219 101 Total equity securities 5,203 108 — (96 ) 4 — 5,219 101 (9) Short sale liabilities — — — — — — — — (3) Other liabilities (3 ) 1 — — — — (2 ) — (5) (1) See Table 15.5 for detail. (2) Represents only net gains (losses) that are due to changes in economic conditions and management’s estimates of fair value and excludes changes due to the collection/realization of cash flows over time. (3) Included in net gains (losses) from trading activities in the income statement. (4) Included in net gains (losses) from debt securities in the income statement. (5) Included in mortgage banking and other noninterest income in the income statement. (6) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). (7) Included in mortgage banking, trading activities, equity securities and other noninterest income in the income statement. (8) Beginning balance includes $382 million of auction rate securities, which changed from the cost to fair value method of accounting in connection with the adoption of ASU 2016-01 in first quarter 2018. (9) Included in net gains (losses) from equity securities in the income statement. (continued on following page) (continued from previous page) Table 15.5 presents gross purchases, sales, issuances and settlements related to the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2018 . Table 15.5: Gross Purchases, Sales, Issuances and Settlements – Level 3 – Quarter ended March 31, 2018 (in millions) Purchases Sales Issuances Settlements Net Quarter ended March 31, 2018 Trading debt securities: Securities of U.S. states and political subdivisions $ — — — — — Collateralized loan obligations 182 (191 ) — (31 ) (40 ) Corporate debt securities 4 (1 ) — — 3 Mortgage-backed securities — — — — — Asset-backed securities — — — — — Other trading debt securities — — — — — Total trading debt securities 186 (192 ) — (31 ) (37 ) Available-for-sale debt securities: Securities of U.S. states and political subdivisions — (4 ) 10 (47 ) (41 ) Mortgage-backed securities: Residential — — — — — Commercial — — — (8 ) (8 ) Total mortgage-backed securities — — — (8 ) (8 ) Corporate debt securities — — — (1 ) (1 ) Collateralized loan and other debt obligations — — — (23 ) (23 ) Asset-backed securities: Automobile loans and leases — — — — — Other asset-backed securities — (8 ) 49 (107 ) (66 ) Total asset-backed securities — (8 ) 49 (107 ) (66 ) Total available-for-sale debt securities — (12 ) 59 (186 ) (139 ) Mortgages held for sale 27 (83 ) 58 (39 ) (37 ) Loans held for sale — (16 ) — — (16 ) Loans 1 — 4 (28 ) (23 ) Mortgage servicing rights (residential) (1) — (4 ) 573 — 569 Net derivative assets and liabilities: Interest rate contracts — — — 266 266 Commodity contracts — — — (24 ) (24 ) Equity contracts — — — 71 71 Foreign exchange contracts — — — 1 1 Credit contracts 3 (2 ) — (4 ) (3 ) Other derivative contracts — — — — — Total derivative contracts 3 (2 ) — 310 311 Equity securities: Marketable — — — — — Nonmarketable — (17 ) — (79 ) (96 ) Total equity securities — (17 ) — (79 ) (96 ) Short sale liabilities — — — — — Other liabilities — — — — — (1) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2017 , are presented in Table 15.6 . Table 15.6: Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis – Quarter ended March 31, 2017 Balance, beginning of period Total net gains (losses) included in Purchases, sales, issuances and settlements, net (1) Net unrealized gains (losses) included in income related to assets and liabilities held at period end (in millions) Net income Other compre- hensive income Transfers into Level 3 Transfers out of Level 3 Balance, end of period (2) Quarter ended March 31, 2017 Trading debt securities: Securities of U.S. states and $ 3 — — — — — 3 — Collateralized loan obligations 309 4 — 85 — — 398 — Corporate debt securities 34 — — 1 3 (1 ) 37 — Mortgage-backed securities — — — — — — — — Asset-backed securities — — — — — — — — Other trading debt securities 28 — (2 ) — — — 26 (1 ) Total trading debt securities 374 4 (2 ) 86 3 (1 ) 464 — (3) Available-for-sale debt securities: Securities of U.S. states and political subdivisions 1,140 — 2 285 5 (72 ) 1,360 — Mortgage-backed securities: Residential 1 — — — — — 1 — Commercial 91 (3 ) 4 (3 ) — — 89 (4 ) Total mortgage-backed securities 92 (3 ) 4 (3 ) — — 90 (4 ) Corporate debt securities 432 (14 ) 8 (35 ) — — 391 — Collateralized loan and other debt obligations 879 5 41 39 — — 964 — Asset-backed securities: Automobile loans and leases — — — — — — — — Other asset-backed securities 962 — 2 (119 ) — — 845 — Total asset-backed securities 962 — 2 (119 ) — — 845 — Total available-for-sale debt securities 3,505 (12 ) 57 167 5 (72 ) 3,650 (4 ) (4) Mortgages held for sale 985 (9 ) — (60 ) 42 (1 ) 957 (11 ) (5) Loans held for sale — — — — — — — — Loans 758 (6 ) — (247 ) — — 505 (5 ) (5) Mortgage servicing rights (residential) (6) 12,959 (287 ) — 536 — — 13,208 174 (5) Net derivative assets and liabilities: Interest rate contracts 121 209 — (112 ) — — 218 85 Commodity contracts 23 2 — (6 ) — — 19 7 Equity contracts (267 ) (44 ) — 37 (22 ) (3 ) (299 ) (57 ) Foreign exchange contracts 12 (9 ) — — — — 3 (5 ) Credit contracts 77 7 — 3 — — 87 (14 ) Other derivative contracts (47 ) 11 — — — — (36 ) 11 Total derivative contracts (81 ) 176 — (78 ) (22 ) (3 ) (8 ) 27 (7) Equity securities: Marketable — — — — — — — — Nonmarketable 3,259 481 — — — — 3,740 485 Total equity securities 3,259 481 — — — — 3,740 485 (8) Short sale liabilities — — — — — — — — (3) Other liabilities (4 ) — — — — — (4 ) — (5) (1) See Table 15.7 for detail. (2) Represents only net gains (losses) that are due to changes in economic conditions and management’s estimates of fair value and excludes changes due to the collection/realization of cash flows over time. (3) Included in net gains (losses) from trading activities in the income statement. (4) Included in net gains (losses) from debt securities in the income statement. (5) Included in mortgage banking and other noninterest income in the income statement. (6) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities). (7) Included in mortgage banking, trading activities, equity securities and other noninterest income in the income statement. (8) Included in net gains (losses) from equity securities in the income statement. (continued on following page) (continued from previous page) Table 15.7 presents gross purchases, sales, issuances and settlements related to the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended March 31, 2017 . Table 15.7: Gross Purchases, Sales, Issuances and Settlements – Level 3 – Quarter ended March 31, 2017 (in millions) Purchases Sales Issuances Settlements Net Quarter ended March 31, 2017 Trading debt securities: Securities of U.S. states and political subdivisions $ 1 (1 ) — — — Collateralized loan obligations 199 (76 ) — (38 ) 85 Corporate debt securities 6 (5 ) — — 1 Mortgage-backed securities — — — — — Asset-backed securities — — — — — Other trading debt securities — — — — — Total trading debt securities 206 (82 ) — (38 ) 86 Available-for-sale debt securities: Securities of U.S. states and political subdivisions — — 346 (61 ) 285 Mortgage-backed securities: Residential — — — — — Commercial — — — (3 ) (3 ) Total mortgage-backed securities — — — (3 ) (3 ) Corporate debt securities 4 — — (39 ) (35 ) Collateralized loan and other debt obligations 72 — — (33 ) 39 Asset-backed securities: Automobile loans and leases — — — — — Other asset-backed securities — — 21 (140 ) (119 ) Total asset-backed securities — — 21 (140 ) (119 ) Total available-for-sale debt securities 76 — 367 (276 ) 167 Mortgages held for sale 22 (156 ) 106 (32 ) (60 ) Loans held for sale — — — — — Loans 1 (129 ) 6 (125 ) (247 ) Mortgage servicing rights (residential) (1) — (47 ) 583 — 536 Net derivative assets and liabilities: Interest rate contracts — — — (112 ) (112 ) Commodity contracts — — — (6 ) (6 ) Equity contracts — — — 37 37 Foreign exchange contracts — — — — — Credit contracts 2 (1 ) — 2 3 Other derivative contracts — — — — — Total derivative contracts 2 (1 ) — (79 ) (78 ) Equity securities: Marketable — — — — — Nonmarketable — — — — — Total equity securities — — — — — Short sale liabilities — — — — — Other liabilities — — — — — (1) For more information on the changes in mortgage servicing rights, see Note 10 (Mortgage Banking Activities).
Fair Value, Assets and Liabilities Measured on Recurring Basis, Quantitative Information about Valuation Techniques and Unobservable Inputs	Table 15.8: Valuation Techniques – Recurring Basis –March 31, 2018 ($ in millions, except cost to service amounts) Fair Value Level 3 Valuation Technique(s) Significant Unobservable Input Range of Inputs Weighted Average (1) March 31, 2018 Trading and available-for-sale debt securities: Securities of U.S. states and political subdivisions: Government, healthcare and other revenue bonds $ 565 Discounted cash flow Discount rate 1.8 - 6.1 % 2.9 Other municipal bonds 11 Discounted cash flow Discount rate 4.8 - 4.9 4.9 44 Vendor priced Collateralized loan and other debt obligations (2) 316 Market comparable pricing Comparability adjustment (17.0 ) - 21.0 2.6 1,045 Vendor priced Asset-backed securities: Diversified payment rights (3) 253 Discounted cash flow Discount rate 2.8 - 4.4 3.6 Other commercial and consumer 221 (4) Discounted cash flow Discount rate 3.9 - 5.4 4.2 Weighted average life 1.8 - 2.1 yrs 1.9 27 Vendor priced Mortgages held for sale (residential) 930 Discounted cash flow Default rate 0.0 - 8.2 % 1.1 Discount rate 1.1 - 6.9 5.6 Loss severity 0.0 - 47.6 26.4 Prepayment rate 3.0 - 12.6 4.9 20 Market comparable pricing Comparability adjustment (56.3 ) - (6.3 ) (44.0 ) Loans 352 (5) Discounted cash flow Discount rate 3.1 - 7.0 4.2 Prepayment rate 4.4 - 100.0 91.2 Loss severity 0.0 - 33.8 7.5 Mortgage servicing rights (residential) 15,041 Discounted cash flow Cost to service per loan (6) $ 77 - 569 136 Discount rate 7.0 - 13.3 % 7.2 Prepayment rate (7) 8.2 - 20.3 9.3 Net derivative assets and (liabilities): Interest rate contracts (45 ) Discounted cash flow Default rate 0.1 - 5.0 2.1 Loss severity 50.0 - 50.0 50.0 Prepayment rate 2.8 - 12.5 10.2 Interest rate contracts: derivative loan commitments 37 Discounted cash flow Fall-out factor 1.0 - 99.0 19.3 Initial-value servicing (52.5 ) - 122.0 bps 23.6 Equity contracts 120 Discounted cash flow Conversion factor (9.6 ) - 0.0 % (8.9 ) Weighted average life 1.3 - 2.8 yrs 2.0 (442 ) Option model Correlation factor (77.0 ) - 99.0 % 27.5 Volatility factor 6.5 - 100.0 24.9 Credit contracts (3 ) Market comparable pricing Comparability adjustment (24.3 ) - 28.8 0.0 44 Option model Credit spread 0.0 - 9.2 0.6 Loss severity 13.0 - 60.0 48.5 Nonmarketable equity securities 9 Discounted cash flow Discount rate 10.0 - 10.0 10.0 Volatility Factor 0.7 - 2.5 1.9 4,917 Market comparable pricing Comparability adjustment (20.2 ) - (4.8 ) (17.2 ) 293 Vendor priced Insignificant Level 3 assets, net of liabilities 539 (8) Total level 3 assets, net of liabilities $ 24,294 (9) (1) Weighted averages are calculated using outstanding unpaid principal balance for cash instruments, such as loans and securities, and notional amounts for derivative instruments. (2) Includes $1.0 billion of collateralized debt obligations. (3) Securities backed by specified sources of current and future receivables generated from foreign originators. (4) A significant portion of the balance consists of investments in asset-backed securities that are revolving in nature, for which the timing of advances and repayments of principal are uncertain. (5) Consists of reverse mortgage loans. (6) The high end of the range of inputs is for servicing modified loans. For non-modified loans the range is $77 - $246 . (7) Includes a blend of prepayment speeds and expected defaults. Prepayment speeds are influenced by mortgage interest rates as well as our estimation of drivers of borrower behavior. (8) Represents the aggregate amount of Level 3 assets and liabilities measured at fair value on a recurring basis that are individually and in the aggregate insignificant. The amount includes corporate debt securities, mortgage-backed securities, other trading positions, other liabilities and certain net derivative assets and liabilities, such as commodity contracts, foreign exchange contracts, and other derivative contracts. (9) Consists of total Level 3 assets of $26.3 billion and total Level 3 liabilities of $2.0 billion , before netting of derivative balances. Table 15.9: Valuation Techniques – Recurring Basis –December 31, 2017 ($ in millions, except cost to service amounts) Fair Value Level 3 Valuation Technique(s) Significant Unobservable Input Range of Inputs Weighted Average (1) December 31, 2017 Trading and available-for-sale debt securities: Securities of U.S. states and political subdivisions: Government, healthcare and other revenue bonds $ 868 Discounted cash flow Discount rate 1.7 - 5.8 % 2.7 Other municipal bonds 11 Discounted cash flow Discount rate 4.7 - 4.9 4.8 49 Vendor priced Collateralized loan and other debt obligations (2) 354 Market comparable pricing Comparability adjustment (22.0 ) - 19.5 3.0 1,020 Vendor priced Asset-backed securities: Diversified payment rights (3) 292 Discounted cash flow Discount rate 2.4 - 3.9 3.1 Other commercial and consumer 248 (4) Discounted cash flow Discount rate 3.7 - 5.2 3.9 Weighted average life 2.0 - 2.3 yrs 2.1 26 Vendor priced Mortgages held for sale (residential) 974 Discounted cash flow Default rate 0.0 - 7.1 % 1.3 Discount rate 2.6 - 7.3 5.6 Loss severity 0.1 - 41.4 19.6 Prepayment rate 6.5 - 15.9 9.1 24 Market comparable pricing Comparability adjustment (56.3 ) - (6.3 ) (42.7 ) Loans 376 (5) Discounted cash flow Discount rate 3.1 - 7.5 4.2 Prepayment rate 8.7 - 100.0 91.9 Loss severity 0.0 - 33.9 6.6 Mortgage servicing rights (residential) 13,625 Discounted cash flow Cost to service per loan (6) $ 78 - 587 143 Discount rate 6.6 - 12.9 % 6.9 Prepayment rate (7) 9.7 - 20.5 10.5 Net derivative assets and (liabilities): Interest rate contracts 54 Discounted cash flow Default rate 0.0 - 5.0 2.1 Loss severity 50.0 - 50.0 50.0 Prepayment rate 2.8 - 12.5 10.5 Interest rate contracts: derivative loan commitments 17 Discounted cash flow Fall-out factor 1.0 - 99.0 15.2 Initial-value servicing (59.9 ) - 101.1 bps 2.7 Equity contracts 102 Discounted cash flow Conversion factor (9.7 ) - 0.0 % (7.6 ) Weighted average life 0.5 - 3.0 yrs 1.6 (613 ) Option model Correlation factor (77.0 ) - 98.0 % 24.2 Volatility factor 5.7 - 95.5 19.2 Credit contracts (3 ) Market comparable pricing Comparability adjustment (29.9 ) - 17.3 (0.2 ) 39 Option model Credit spread 0.0 - 63.7 1.3 Loss severity 13.0 - 60.0 50.7 Nonmarketable equity securities 8 Discounted cash flow Discount rate 10.0 - 10.0 10.0 Volatility Factor 0.5 - 1.9 1.4 4,813 Market comparable pricing Comparability adjustment (21.1 ) - (5.5 ) (15.0 ) Insignificant Level 3 assets, net of liabilities 570 (8) Total level 3 assets, net of liabilities $ 22,854 (9) (1) Weighted averages are calculated using outstanding unpaid principal balance for cash instruments, such as loans and securities, and notional amounts for derivative instruments. (2) Includes $1.0 billion of collateralized debt obligations. (3) Securities backed by specified sources of current and future receivables generated from foreign originators. (4) A significant portion of the balance consists of investments in asset-backed securities that are revolving in nature, for which the timing of advances and repayments of principal are uncertain. (5) Consists of reverse mortgage loans. (6) The high end of the range of inputs is for servicing modified loans. For non-modified loans the range is $78 - $252 . (7) Includes a blend of prepayment speeds and expected defaults. Prepayment speeds are influenced by mortgage interest rates as well as our estimation of drivers of borrower behavior. (8) Represents the aggregate amount of Level 3 assets and liabilities measured at fair value on a recurring basis that are individually and in the aggregate insignificant. The amount includes corporate debt securities, mortgage-backed securities, other trading positions, other liabilities and certain net derivative assets and liabilities, such as commodity contracts, foreign exchange contracts, and other derivative contracts. (9) Consists of total Level 3 assets of $24.9 billion and total Level 3 liabilities of $2.0 billion , before netting of derivative balances.
Fair Value, Assets Recorded at Fair Value on a Nonrecurring Basis	Table 15.10 provides the fair value hierarchy and carrying amount of all assets that were still held as of March 31, 2018 , and December 31, 2017 , and for which a nonrecurring fair value adjustment was recorded during the periods presented. Table 15.10: Fair Value on a Nonrecurring Basis March 31, 2018 December 31, 2017 (in millions) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Mortgages held for sale (LOCOM) (1) $ — 1,606 1,285 2,891 — 1,646 1,333 2,979 Loans held for sale — 1,799 — 1,799 — 108 — 108 Loans: Commercial — 218 — 218 — 374 — 374 Consumer — 130 3 133 — 502 10 512 Total loans (2) — 348 3 351 — 876 10 886 Nonmarketable equity securities (3) — 356 128 484 — — 136 136 Other assets (4) — 146 12 158 — 177 161 338 Total assets at fair value on a nonrecurring basis (5) $ — 4,255 1,428 5,683 — 2,807 1,640 4,447 (1) Consists of commercial mortgages and residential real estate 1-4 family first mortgage loans. (2) Represents the carrying value of loans for which nonrecurring adjustments are based on the appraised value of the collateral. (3) Consists of certain nonmarketable equity securities that are measured at fair value on a nonrecurring basis, including observable price adjustments for nonmarketable equity securities carried under the measurement alternative. (4) Includes the fair value of foreclosed real estate, other collateral owned and operating lease assets. (5) Prior period balances exclude $6 million of nonmarketable equity securities at NAV.
Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis	Table 15.11 presents the increase (decrease) in value of certain assets held at the end of the respective reporting periods presented for which a nonrecurring fair value adjustment was recognized during the periods presented. Table 15.11: Change in Value of Assets with Nonrecurring Fair Value Adjustment Quarter ended March 31, (in millions) 2018 2017 Mortgages held for sale (LOCOM) $ 7 21 Loans held for sale (82 ) — Loans: Commercial (81 ) (127 ) Consumer (107 ) (175 ) Total loans (1) (188 ) (302 ) Nonmarketable equity securities (2) 208 (60 ) Other assets (3) (22 ) (40 ) Total $ (77 ) (381 ) (1) Represents write-downs of loans based on the appraised value of the collateral. (2) Includes impairment losses and observable price adjustments for certain nonmarketable equity securities. (3) Includes the losses on foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Quantitative Information about Valuation Techniques and Unobservable Inputs	Table 15.12 provides quantitative information about the valuation techniques and significant unobservable inputs used in the valuation of substantially all of our Level 3 assets that are measured at fair value on a nonrecurring basis using an internal model. The table is limited to financial instruments that had nonrecurring fair value adjustments during the periods presented. We have excluded from the table valuation techniques and significant unobservable inputs for certain classes of Level 3 assets measured using an internal model that we consider, both individually and in the aggregate, insignificant relative to our overall Level 3 nonrecurring measurements. We made this determination based upon an evaluation of each class that considered the magnitude of the positions, nature of the unobservable inputs and potential for significant changes in fair value due to changes in those inputs. Table 15.12: Valuation Techniques – Nonrecurring Basis ($ in millions) Fair Value Level 3 Valuation Technique(s) (1) Significant Unobservable Inputs (1) Range of inputs Weighted Average (2) March 31, 2018 Residential mortgages held for sale (LOCOM) $ 1,285 (3) Discounted cash flow Default rate (4) 0.2 — 3.4 % 1.7 % Discount rate 1.5 — 8.5 3.8 Loss severity 0.7 — 50.5 2.2 Prepayment rate (5) 4.4 — 100.0 49.0 Nonmarketable equity securities 17 Discounted cash flow Discount rate 10.5 — 10.5 10.5 Insignificant level 3 assets 126 Total $ 1,428 December 31, 2017 Residential mortgages held for sale (LOCOM) $ 1,333 (3) Discounted cash flow Default rate (4) 0.1 — 4.1 % 1.7 % Discount rate 1.5 — 8.5 3.8 Loss severity 0.7 — 52.9 2.2 Prepayment rate (5) 5.4 — 100.0 50.6 Nonmarketable equity securities 122 Discounted cash flow Discount rate 5.0 — 10.5 10.2 Insignificant level 3 assets 185 Total $ 1,640 (1) Refer to the narrative following Table 15.9 for a definition of the valuation technique(s) and significant unobservable inputs. (2) For residential MHFS, weighted averages are calculated using the outstanding unpaid principal balance of the loans. (3) Consists of approximately $1.3 billion of government insured/guaranteed loans purchased from GNMA-guaranteed mortgage securitizations at both March 31, 2018 , and December 31, 2017 , and $26 million of other mortgage loans that are not government insured/guaranteed at both dates. (4) Applies only to non-government insured/guaranteed loans. (5) Includes the impact on prepayment rate of expected defaults for government insured/guaranteed loans, which impact the frequency and timing of early resolution of loans.
Fair Value Option, Carrying Amount	Table 15.13 reflects differences between the fair value carrying amount of the assets for which we have elected the fair value option and the contractual aggregate unpaid principal amount at maturity. Table 15.13: Fair Value Option March 31, 2018 December 31, 2017 (in millions) Fair value carrying amount Aggregate unpaid principal Fair value carrying amount less aggregate unpaid principal Fair value carrying amount Aggregate unpaid principal Fair value carrying amount less aggregate unpaid principal Mortgages held for sale: Total loans $ 13,859 13,762 97 16,116 15,827 289 Nonaccrual loans 128 168 (40 ) 127 165 (38 ) Loans 90 days or more past due and still accruing 9 13 (4 ) 16 21 (5 ) Loans held for sale: Total loans 1,695 1,749 (54 ) 1,023 1,075 (52 ) Nonaccrual loans 29 53 (24 ) 34 56 (22 ) Loans: Total loans 352 382 (30 ) 376 404 (28 ) Nonaccrual loans 244 274 (30 ) 253 281 (28 ) Equity securities (1) 4,975 N/A N/A 4,867 N/A N/A (1) Consists of nonmarketable equity securities carried at fair value.
Fair Value Option, Gains and Losses	The changes in fair value related to initial measurement and subsequent changes in fair value included in earnings for these assets measured at fair value are shown in Table 15.14 by income statement line item. Table 15.14: Fair Value Option – Changes in Fair Value Included in Earnings 2018 2017 (in millions) Mortgage banking noninterest income Net gains (losses) from trading activities Other noninterest income Mortgage banking noninterest income Net gains (losses) from trading activities Other noninterest income Quarter ended March 31, Mortgages held for sale $ (59 ) — — 279 — — Loans held for sale — 6 — — 25 — Loans — — (1 ) — — — Equity securities — — 101 — — 490 Other interests held (1) — (1 ) — — (2 ) — (1) Includes retained interests in securitizations.
Fair Value Option, Instrument Specific Credit Risk	Table 15.15 shows the estimated gains and losses from earnings attributable to instrument-specific credit risk related to assets accounted for under the fair value option. Table 15.15: Fair Value Option – Gains/Losses Attributable to Instrument-Specific Credit Risk Quarter ended March 31, (in millions) 2018 2017 Gains (losses) attributable to instrument-specific credit risk: Mortgages held for sale $ 1 (1 ) Loans held for sale 6 25 Total $ 7 24
Fair Value, Estimates for Financial Instruments Excluding those Recorded at Fair Value on a Recurring Basis	Table 15.16 is a summary of fair value estimates for financial instruments, excluding financial instruments recorded at fair value on a recurring basis, as they are included within Table 15.2 in this Note. In connection with the adoption of ASU 2016-01 in first quarter 2018, the valuation methodologies for estimating the fair value of financial instruments in Table 15.16 have been changed, where necessary, to conform with an exit price notion . Under an exit price notion, fair value estimates are based upon the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the balance sheet date. For certain loans and deposit liabilities, the estimated fair values prior to adoption of ASU 2016-01 followed an entrance price notion that based fair values on recent prices offered to customers for loans and deposits with similar characteristics. The carrying amounts in the following table are recorded on the balance sheet under the indicated captions. We have not included assets and liabilities that are not financial instruments in our disclosure, such as the value of the long-term relationships with our deposit, credit card and trust customers, amortized MSRs, premises and equipment, goodwill and other intangibles, deferred taxes and other liabilities. The total of the fair value calculations presented does not represent, and should not be construed to represent, the underlying value of the Company. Table 15.16: Fair Value Estimates for Financial Instruments Estimated fair value (in millions) Carrying amount Level 1 Level 2 Level 3 Total March 31, 2018 Financial assets Cash and due from banks (1) $ 18,145 18,145 — — 18,145 Interest-earning deposits with banks (1) 184,250 184,091 159 — 184,250 Federal funds sold and securities purchased under resale agreements (1) 73,550 — 73,550 — 73,550 Held-to-maturity debt securities 141,446 44,179 93,650 494 138,323 Mortgages held for sale 4,085 — 2,808 1,285 4,093 Loans held for sale 1,886 — 1,887 — 1,887 Loans, net (2)(3) 917,574 — 49,806 871,564 921,370 Nonmarketable equity securities (cost method) (4) 5,780 — — 5,803 5,803 Total financial assets $ 1,346,716 246,415 221,860 879,146 1,347,421 Financial liabilities Deposits (3)(5) $ 118,666 — 98,649 19,930 118,579 Short-term borrowings 97,207 — 97,204 — 97,204 Long-term debt (6) 227,264 — 228,231 2,029 230,260 Total financial liabilities $ 443,137 — 424,084 21,959 446,043 December 31, 2017 Financial assets Cash and due from banks (1) $ 23,367 23,367 — — 23,367 Interest-earning deposits with banks (1) 192,580 192,455 125 — 192,580 Federal funds sold and securities purchased under resale agreements (1) 80,025 1,002 78,954 69 80,025 Held-to-maturity securities 139,335 44,806 93,694 485 138,985 Mortgages held for sale 3,954 — 2,625 1,333 3,958 Loans held for sale 108 — 108 — 108 Loans, net (2)(3) 926,273 — 51,713 886,622 938,335 Nonmarketable equity securities (cost method) 7,136 — 23 7,605 7,628 Total financial assets (7) $ 1,372,778 261,630 227,242 896,114 1,384,986 Financial liabilities Deposits (3)(5) $ 128,594 — 108,146 19,768 127,914 Short-term borrowings 103,256 — 103,256 — 103,256 Long-term debt (6) 224,981 — 227,109 3,159 230,268 Total financial liabilities $ 456,831 — 438,511 22,927 461,438 (1) Amounts consist of financial instruments for which carrying value approximates fair value. (2) Excludes lease financing with a carrying amount of $19.3 billion and $19.4 billion at March 31, 2018 , and December 31, 2017 , respectively. (3) In connection with the adoption of ASU 2016-01, the valuation methodologies used to estimate the fair value at March 31, 2018 , for a portion of loans and deposit liabilities with a defined or contractual maturity has been changed to conform to an exit price notion. The fair value estimates at December 31, 2017 have not been revised to reflect application of the modified methodology. (4) Excludes $1.3 billion of nonmarketable equity securities accounted for under the measurement alternative at March 31, 2018 , that were accounted for under the cost method in prior periods. (5) Excludes deposit liabilities with no defined or contractual maturity of $1.2 trillion at both March 31, 2018 and December 31, 2017 . (6) Excludes capital lease obligations under capital leases of $38 million and $39 million at March 31, 2018 , and December 31, 2017 , respectively. (7) Excludes $27 million of carrying value and $30 million of fair value relating to nonmarketable equity securities at NAV at December 31, 2017.

Preferred Stock (Tables)

Preferred Stock (Tables)	3 Months Ended
	Mar. 31, 2018
Preferred Stock [Abstract]
Preferred Stock Shares	Our total authorized, issued and outstanding preferred stock is presented in the following two tables along with the Employee Stock Ownership Plan (ESOP) Cumulative Convertible Preferred Stock. Table 16.1: Preferred Stock Shares March 31, 2018 December 31, 2017 Liquidation preference per share Shares authorized and designated Liquidation preference per share Shares authorized and designated DEP Shares Dividend Equalization Preferred Shares (DEP) $ 10 97,000 $ 10 97,000 Series I Floating Class A Preferred Stock 100,000 25,010 100,000 25,010 Series J 8.00% Non-Cumulative Perpetual Class A Preferred Stock 1,000 2,300,000 1,000 2,300,000 Series K 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 1,000 3,500,000 1,000 3,500,000 Series L 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock 1,000 4,025,000 1,000 4,025,000 Series N 5.20% Non-Cumulative Perpetual Class A Preferred Stock 25,000 30,000 25,000 30,000 Series O 5.125% Non-Cumulative Perpetual Class A Preferred Stock 25,000 27,600 25,000 27,600 Series P 5.25% Non-Cumulative Perpetual Class A Preferred Stock 25,000 26,400 25,000 26,400 Series Q 5.85% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 69,000 25,000 69,000 Series R 6.625% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 34,500 25,000 34,500 Series S 5.90% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 80,000 25,000 80,000 Series T 6.00% Non-Cumulative Perpetual Class A Preferred Stock 25,000 32,200 25,000 32,200 Series U 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 25,000 80,000 25,000 80,000 Series V 6.00% Non-Cumulative Perpetual Class A Preferred Stock 25,000 40,000 25,000 40,000 Series W 5.70% Non-Cumulative Perpetual Class A Preferred Stock 25,000 40,000 25,000 40,000 Series X 5.50% Non-Cumulative Perpetual Class A Preferred Stock 25,000 46,000 25,000 46,000 Series Y 5.625% Non-Cumulative Perpetual Class A Preferred Stock 25,000 27,600 25,000 27,600 ESOP Cumulative Convertible Preferred Stock (1) — 2,425,104 — 1,556,104 Total 12,905,414 12,036,414 (1) See the ESOP Cumulative Convertible Preferred Stock section in this Note for additional information about the liquidation preference for the ESOP Cumulative Convertible Preferred Stock. Table 16.2: Preferred Stock – Shares Issued and Carrying Value March 31, 2018 December 31, 2017 (in millions, except shares) Shares issued and outstanding Liquidation preference value Carrying value Discount Shares issued and outstanding Liquidation preference value Carrying value Discount DEP Shares Dividend Equalization Preferred Shares (DEP) 96,546 $ — — — 96,546 $ — — — Series I (1) Floating Class A Preferred Stock 25,010 2,501 2,501 — 25,010 2,501 2,501 — Series J (1) 8.00% Non-Cumulative Perpetual Class A Preferred Stock 2,150,375 2,150 1,995 155 2,150,375 2,150 1,995 155 Series K (1) 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 3,352,000 3,352 2,876 476 3,352,000 3,352 2,876 476 Series L (1) 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock 3,968,000 3,968 3,200 768 3,968,000 3,968 3,200 768 Series N (1) 5.20% Non-Cumulative Perpetual Class A Preferred Stock 30,000 750 750 — 30,000 750 750 — Series O (1) 5.125% Non-Cumulative Perpetual Class A Preferred Stock 26,000 650 650 — 26,000 650 650 — Series P (1) 5.25% Non-Cumulative Perpetual Class A Preferred Stock 25,000 625 625 — 25,000 625 625 — Series Q (1) 5.85% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 69,000 1,725 1,725 — 69,000 1,725 1,725 — Series R (1) 6.625% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 33,600 840 840 — 33,600 840 840 — Series S (1) 5.90% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 80,000 2,000 2,000 — 80,000 2,000 2,000 — Series T (1) 6.00% Non-Cumulative Perpetual Class A Preferred Stock 32,000 800 800 — 32,000 800 800 — Series U (1) 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock 80,000 2,000 2,000 — 80,000 2,000 2,000 — Series V (1) 6.00% Non-Cumulative Perpetual Class A Preferred Stock 40,000 1,000 1,000 — 40,000 1,000 1,000 — Series W (1) 5.70% Non-Cumulative Perpetual Class A Preferred Stock 40,000 1,000 1,000 — 40,000 1,000 1,000 — Series X (1) 5.50% Non-Cumulative Perpetual Class A Preferred Stock 46,000 1,150 1,150 — 46,000 1,150 1,150 — Series Y (1) 5.625% Non-Cumulative Perpetual Class A Preferred Stock 27,600 690 690 — 27,600 690 690 — ESOP Cumulative Convertible Preferred Stock 2,425,104 2,425 2,425 — 1,556,104 1,556 1,556 — Total 12,546,235 $ 27,626 26,227 1,399 11,677,235 $ 26,757 25,358 1,399 (1) Preferred shares qualify as Tier 1 capital.
ESOP Preferred Stock	Table 16.3: ESOP Preferred Stock Shares issued and outstanding Carrying value Adjustable dividend rate (in millions, except shares) Mar 31, Dec 31, Mar 31, Dec 31, Minimum Maximum ESOP Preferred Stock $1,000 liquidation preference per share 2018 1,100,000 — $ 1,100 — 7.00 % 8.00 2017 249,210 273,210 249 273 7.00 8.00 2016 268,826 322,826 269 323 9.30 10.30 2015 167,436 187,436 167 187 8.90 9.90 2014 212,151 237,151 212 237 8.70 9.70 2013 169,948 201,948 170 202 8.50 9.50 2012 105,634 128,634 106 129 10.00 11.00 2011 99,296 129,296 99 129 9.00 10.00 2010 52,603 75,603 53 76 9.50 10.50 Total ESOP Preferred Stock (1) 2,425,104 1,556,104 $ 2,425 1,556 Unearned ESOP shares (2) $ (2,571 ) (1,678 ) (1) At March 31, 2018 and December 31, 2017 , additional paid-in capital included $146 million and $122 million , respectively, related to ESOP preferred stock. (2) We recorded a corresponding charge to unearned ESOP shares in connection with the issuance of the ESOP Preferred Stock. The unearned ESOP shares are reduced as shares of the ESOP Preferred Stock are committed to be released.

Revenue from Contracts with C47

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	Table 17.1 presents our revenue by operating segment. The other segment for each of the tables below includes the elimination of certain items that are included in more than one business segment, most of which represents products and services for WIM customers served through Community Banking distribution channels. For additional description of our operating segments, including additional financial information and the underlying management accounting process, see Note 21 (Operating Segments) to Financial Statements in this Report. Table 17.1 : Revenue by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net interest income (1) $ 7,195 7,132 4,532 4,681 1,112 1,141 (601 ) (630 ) 12,238 12,324 Noninterest income: Service charges on deposit accounts 639 742 534 570 4 5 (4 ) (4 ) 1,173 1,313 Trust and investment fees: Brokerage advisory, commissions and other fees 478 444 67 84 2,344 2,245 (486 ) (449 ) 2,403 2,324 Trust and investment management 233 218 113 129 743 707 (239 ) (225 ) 850 829 Investment banking (10 ) (27 ) 440 445 — (1 ) — — 430 417 Total trust and investment fees 701 635 620 658 3,087 2,951 (725 ) (674 ) 3,683 3,570 Card fees 821 865 87 80 1 1 (1 ) (1 ) 908 945 Other fees: Charges and fees on loans (1) 74 84 227 223 1 1 (1 ) (1 ) 301 307 Cash network fees 125 123 1 3 — — — — 126 126 Commercial real estate brokerage commissions — — 85 81 — — — — 85 81 Letters of credit fees (1) 2 1 77 73 1 1 (1 ) (1 ) 79 74 Wire transfer and other remittance fees 63 57 52 49 2 2 (1 ) (1 ) 116 107 All other fees 63 130 30 39 — 1 — — 93 170 Total other fees 327 395 472 468 4 5 (3 ) (3 ) 800 865 Mortgage banking (1) 842 1,106 93 123 (3 ) (2 ) 2 1 934 1,228 Insurance (1) 28 34 79 234 18 20 (11 ) (11 ) 114 277 Net gains (losses) from trading activities (1) (1 ) (52 ) 225 290 19 34 — — 243 272 Net gains (losses) on debt securities (1) — 102 1 (66 ) — — — — 1 36 Net gains from equity securities (1) 684 468 93 36 6 66 — — 783 570 Lease income (1) — — 455 481 — — — — 455 481 Other income of the segment (1) 594 396 88 22 (6 ) 36 (74 ) (80 ) 602 374 Total noninterest income 4,635 4,691 2,747 2,896 3,130 3,116 (816 ) (772 ) 9,696 9,931 Revenue $ 11,830 11,823 7,279 7,577 4,242 4,257 (1,417 ) (1,402 ) 21,934 22,255 (1) These revenues are not within the scope of ASU 2014-09 – Revenue from Contracts with Customers , and additional details are included in other footnotes to our financial statements. The scope explicitly excludes net interest income as well as many other revenues for financial assets and liabilities, including loans, leases, securities, and derivatives.
Disaggregation of Revenue [Table Text Block]	Table 17.4 presents our trust and investment management fees by operating segment. Table 17.4 : Trust and Investment Management Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Investment management fees $ — 1 — — 534 500 — — 534 501 Trust fees 221 217 86 104 188 184 (239 ) (225 ) 256 280 Other revenue 12 — 27 25 21 23 — — 60 48 Trust and investment management fees $ 233 218 113 129 743 707 (239 ) (225 ) 850 829 Table 17.3 presents our brokerage advisory, commissions and other fees by operating segment. Table 17.3 : Brokerage Advisory, Commissions and Other Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Asset-based revenue (1) $ 371 326 — — 1,743 1,599 (371 ) (326 ) 1,743 1,599 Transactional revenue 93 100 12 10 439 479 (100 ) (105 ) 444 484 Other revenue 14 18 55 74 162 167 (15 ) (18 ) 216 241 Brokerage advisory, commissions and other fees $ 478 444 67 84 2,344 2,245 (486 ) (449 ) 2,403 2,324 (1) We earned $331 million in trailing commissions in the first quarter of both 2018 and 2017, respectively. Table 17.5 presents our card fees by operating segment. Table 17.5 : Card Fees by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Credit card interchange and network revenues (1) $ 171 219 87 80 1 1 (1 ) (1 ) 258 299 Debit card interchange and network revenues 479 465 — — — — — — 479 465 Late fees, cash advance fees, balance transfer fees, and annual fees 171 181 — — — — — — 171 181 Card fees (1) $ 821 865 87 80 1 1 (1 ) (1 ) 908 945 (1) The cost of credit card rewards and rebates of $343 million and $277 million for the quarters ended March 31, 2018 and March 31, 2017, respectively, are presented net against the related revenues. Table 17.2 presents our service charges on deposit accounts by operating segment. Table 17.2 : Service Charges on Deposit Accounts by Operating Segment Quarter ended March 31, Community Banking Wholesale Banking Wealth and Investment Management Other Consolidated (in millions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Overdraft fees $ 412 484 2 2 — — — — 414 486 Account charges 227 258 532 568 4 5 (4 ) (4 ) 759 827 Service charges on deposit accounts $ 639 742 534 570 4 5 (4 ) (4 ) 1,173 1,313

Employee Benefits (Tables)

Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Net Periodic Benefit Cost	Table 18.1 presents the components of net periodic benefit cost. Table 18.1: Net Periodic Benefit Cost 2018 2017 Pension benefits Pension benefits (in millions) Qualified Non-qualified Other benefits Qualified Non-qualified Other benefits Quarter ended March 31, Service cost $ 1 — — 1 — — Interest cost (1) 98 5 5 103 6 7 Expected return on plan assets (1) (160 ) — (7 ) (163 ) — (7 ) Amortization of net actuarial loss (gain) (1) 33 3 (4 ) 38 2 (2 ) Amortization of prior service credit (1) — — (3 ) — — (3 ) Settlement loss (1) — 3 — 1 2 — Net periodic benefit cost (income) $ (28 ) 11 (9 ) (20 ) 10 (5 ) (1) Effective January 1, 2018, we adopted ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . Accordingly, 2018 balances are reported in other noninterest expense on the consolidated statement of income. For 2017, these balances were reported in employee benefits.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share Calculations	Table 19.1 shows earnings per common share and diluted earnings per common share and reconciles the numerator and denominator of both earnings per common share calculations. Table 19.1: Earnings Per Common Share Calculations Quarter ended March 31, (in millions, except per share amounts) 2018 2017 Wells Fargo net income (1) $ 5,136 5,634 Less: Preferred stock dividends and other 403 401 Wells Fargo net income applicable to common stock (numerator) (1) $ 4,733 5,233 Earnings per common share Average common shares outstanding (denominator) 4,885.7 5,008.6 Per share (1) $ 0.97 1.05 Diluted earnings per common share Average common shares outstanding 4,885.7 5,008.6 Add: Stock options 9.9 21.2 Restricted share rights 28.3 28.0 Warrants 6.8 12.6 Diluted average common shares outstanding (denominator) 4,930.7 5,070.4 Per share (1) $ 0.96 1.03 (1) Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
Outstanding Anti-Dilutive Options	Table 19.2 presents the outstanding options to purchase shares of common stock that were anti-dilutive (the exercise price was higher than the weighted-average market price), and therefore not included in the calculation of diluted earnings per common share. Table 19.2: Outstanding Anti-Dilutive Options Weighted-average shares Quarter ended March 31, (in millions) 2018 2017 Options 0.9 2.2

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2018
Cumulative Other Comprehensive Income Balances [Abstract]
Summary of Other Comprehensive Income	Table 20.1 provides the components of other comprehensive income (OCI), reclassifications to net income by income statement line item, and the related tax effects. Table 20.1: Summary of Other Comprehensive Income Quarter ended March 31, 2018 2017 (in millions) Before tax Tax effect Net of tax Before tax Tax effect Net of tax Debt securities (1): Net unrealized gains (losses) arising during the period $ (3,443 ) 848 (2,595 ) 369 (133 ) 236 Reclassification of net (gains) losses to net income: Interest income on debt securities (2) 69 (17 ) 52 7 (3 ) 4 Net gains on debt securities (1 ) — (1 ) (36 ) 13 (23 ) Net gains from equity securities (3) — — — (116 ) 44 (72 ) Subtotal reclassifications to net income 68 (17 ) 51 (145 ) 54 (91 ) Net change (3,375 ) 831 (2,544 ) 224 (79 ) 145 Derivatives and hedging activities: Fair Value Hedges: Change in fair value of excluded components on fair value hedges (4) 24 (6 ) 18 (226 ) 85 (141 ) Cash Flow Hedges: Net unrealized losses arising during the period on cash flow hedges (266 ) 66 (200 ) (136 ) 51 (85 ) Reclassification of net (gains) losses to net income on cash flow hedges: Interest income on loans 60 (15 ) 45 (205 ) 77 (128 ) Interest expense on long-term debt — — — 3 (1 ) 2 Subtotal reclassifications to net income 60 (15 ) 45 (202 ) 76 (126 ) Net change (182 ) 45 (137 ) (564 ) 212 (352 ) Defined benefit plans adjustments: Net actuarial and prior service gains (losses) arising during the period 6 (2 ) 4 (7 ) 3 (4 ) Reclassification of amounts to net periodic benefit costs (5): Amortization of net actuarial loss 32 (8 ) 24 38 (14 ) 24 Settlements and other — 1 1 — — — Subtotal reclassifications to net periodic benefit costs 32 (7 ) 25 38 (14 ) 24 Net change 38 (9 ) 29 31 (11 ) 20 Foreign currency translation adjustments: Net unrealized gains (losses) arising during the period (2 ) (5 ) (7 ) 16 1 17 Net change (2 ) (5 ) (7 ) 16 1 17 Other comprehensive loss $ (3,521 ) 862 (2,659 ) (293 ) 123 (170 ) Less: Other comprehensive income from noncontrolling interests, net of tax — 14 Wells Fargo other comprehensive loss, net of tax $ (2,659 ) (184 ) (1) After adoption of ASU 2016-01 on January 1, 2018, these lines reflect only net unrealized gains and reclassification of net gains from debt securities. The quarter ended March 31, 2017, includes net unrealized gains arising during the period from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million. (2) Represents net unrealized gains and losses amortized over the remaining lives of securities that were transferred from the available-for-sale portfolio to the held-to-maturity portfolio. (3) Net gains from equity securities is presented for table presentation purposes. After adoption of ASU 2016-01 on January 1, 2018, this line does not contain balances as realized and unrealized gains and losses on marketable equity securities are recorded in earnings. (4) Represents changes in fair value of cross-currency swaps attributable to changes in cross-currency basis spreads, which are excluded from the assessment of effectiveness recorded in other comprehensive income. (5) These items are included in the computation of net periodic benefit cost, which is recorded in employee benefits expense (see Note 18 (Employee Benefits) for additional details).
Cumulative OCI Balances	Table 20.2: Cumulative OCI Balances (in millions) Debt securities (1) Derivatives and hedging activities Defined benefit plans adjustments Foreign currency translation adjustments Cumulative other compre- hensive income Quarter ended March 31, 2018 Balance, beginning of period $ 171 (418 ) (1,808 ) (89 ) (2,144 ) Transition adjustment (2) (118 ) — — — (118 ) Balance, January 1, 2018 53 (418 ) (1,808 ) (89 ) (2,262 ) Net unrealized gains (losses) arising during the period (2,595 ) (182 ) 4 (7 ) (2,780 ) Amounts reclassified from accumulated other comprehensive income 51 45 25 — 121 Net change (2,544 ) (137 ) 29 (7 ) (2,659 ) Less: Other comprehensive income from noncontrolling interests — — — — — Balance, end of period $ (2,491 ) (555 ) (1,779 ) (96 ) (4,921 ) Quarter ended March 31, 2017 Balance, beginning of period $ (1,099 ) 89 (1,943 ) (184 ) (3,137 ) Transition adjustment (3) — 168 — — 168 Balance, January 1, 2017 (1,099 ) 257 (1,943 ) (184 ) (2,969 ) Net unrealized gains (losses) arising during the period 236 (226 ) (4 ) 17 23 Amounts reclassified from accumulated other comprehensive income (91 ) (126 ) 24 — (193 ) Net change 145 (352 ) 20 17 (170 ) Less: Other comprehensive income from noncontrolling interests 13 — — 1 14 Balance, end of period $ (967 ) (95 ) (1,923 ) (168 ) (3,153 ) (1) After adoption of ASU 2016-01 on January 1, 2018, the balances only reflect net unrealized gains and reclassification of net gains from debt securities. The quarter ended March 31, 2017, includes net unrealized gains arising during the period from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million . (2) The transition adjustment relates to the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . See Note 1 (Summary of Significant Accounting Policies) for more information. (3) The transition adjustment relates to the adoption of ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . See Note 1 (Summary of Significant Accounting Policies) for more information.

Operating Segments (Tables)

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Operating Segments	Table 21.1 presents our results by operating segment. Table 21.1: Operating Segments Community Banking Wholesale Banking Wealth and Investment Management Other (1) Consolidated Company (income/expense in millions, average balances in billions) 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Quarter ended March 31, Net interest income (2) $ 7,195 7,132 4,532 4,681 1,112 1,141 (601 ) (630 ) 12,238 12,324 Provision (reversal of provision) for credit losses 218 646 (20 ) (43 ) (6 ) (4 ) (1 ) 6 191 605 Noninterest income 4,635 4,691 2,747 2,896 3,130 3,116 (816 ) (772 ) 9,696 9,931 Noninterest expense 8,702 7,281 3,978 4,167 3,290 3,204 (928 ) (860 ) 15,042 13,792 Income (loss) before income tax expense (benefit) 2,910 3,896 3,321 3,453 958 1,057 (488 ) (548 ) 6,701 7,858 Income tax expense (benefit) 809 982 448 973 239 386 (122 ) (208 ) 1,374 2,133 Net income (loss) before noncontrolling interests 2,101 2,914 2,873 2,480 719 671 (366 ) (340 ) 5,327 5,725 Less: Net income (loss) from noncontrolling interests 188 90 (2 ) (5 ) 5 6 — — 191 91 Net income (loss) (3) $ 1,913 2,824 2,875 2,485 714 665 (366 ) (340 ) 5,136 5,634 Average loans $ 470.5 480.7 465.1 468.3 73.9 70.7 (58.5 ) (56.1 ) 951.0 963.6 Average assets 1,061.9 1,095.8 829.2 810.5 84.2 81.8 (59.4 ) (57.1 ) 1,915.9 1,931.0 Average deposits 747.5 717.8 446.0 465.3 177.9 197.5 (74.2 ) (81.4 ) 1,297.2 1,299.2 (1) Includes the elimination of certain items that are included in more than one business segment, most of which represents products and services for Wealth and Investment Management customers served through Community Banking distribution channels. (2) Net interest income is the difference between interest earned on assets and the cost of liabilities to fund those assets. Interest earned includes actual interest earned on segment assets as well as interest credits for any funding of a segment available to be provided to other segments. The cost of liabilities includes actual interest expense on segment liabilities as well as funding charges for any funding provided from other segments. (3) Represents segment net income (loss) for Community Banking; Wholesale Banking; and Wealth and Investment Management segments and Wells Fargo net income for the consolidated company.

Regulatory and Agency Capital52

Regulatory and Agency Capital Requirements (Tables)	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
Regulatory And Agency Capital Requirements	Table 22.1 presents regulatory capital information for Wells Fargo & Company and the Bank using Basel III, which increased minimum required capital ratios, and introduced a minimum Common Equity Tier 1 (CET1) ratio. We must report the lower of our CET1, tier 1 and total capital ratios calculated under the Standardized Approach and under the Advanced Approach in the assessment of our capital adequacy. The Standardized Approach applies assigned risk weights to broad risk categories, while the calculation of risk-weighted assets (RWAs) under the Advanced Approach differs by requiring applicable banks to utilize a risk-sensitive methodology, which relies upon the use of internal credit models, and includes an operational risk component. The Basel III capital rules are being phased-in effective January 1, 2014, through the end of 2021. Beginning January 1, 2018, the requirements for calculating CET1 and tier 1 capital, along with RWAs, were fully phased-in. Accordingly, the information presented reflects fully phased-in CET1 capital, tier 1 capital, and RWAs, but reflects total capital with Transition Requirements . The Bank is an approved seller/servicer of mortgage loans and is required to maintain minimum levels of shareholders’ equity, as specified by various agencies, including the United States Department of Housing and Urban Development, GNMA, FHLMC and FNMA. At March 31, 2018 , the Bank met these requirements. Other subsidiaries, including the Company’s insurance and broker-dealer subsidiaries, are also subject to various minimum capital levels, as defined by applicable industry regulations. The minimum capital levels for these subsidiaries, and related restrictions, are not significant to our consolidated operations. Table 22.1: Regulatory Capital Information Wells Fargo & Company Wells Fargo Bank, N.A. March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 (in millions, except ratios) Advanced Approach Standardized Approach Advanced Approach Standardized Advanced Approach Standardized Advanced Approach Standardized Regulatory capital: Common equity tier 1 $ 152,304 152,304 154,765 154,765 141,049 141,049 143,292 143,292 Tier 1 175,810 175,810 178,209 178,209 141,049 141,049 143,292 143,292 Total 207,531 216,237 210,333 220,097 154,939 163,259 156,661 165,734 Assets: Risk-weighted $ 1,203,464 1,278,113 1,199,545 1,260,663 1,094,474 1,185,860 1,090,360 1,169,863 Adjusted average (1) 1,886,209 1,886,209 1,905,568 1,905,568 1,689,250 1,689,250 1,708,828 1,708,828 Regulatory capital ratios: Common equity tier 1 capital 12.66 % 11.92 * 12.90 12.28 * 12.89 11.89 * 13.14 12.25 * Tier 1 capital 14.61 13.76 * 14.86 14.14 * 12.89 11.89 * 13.14 12.25 * Total capital 17.24 16.92 * 17.53 17.46 * 14.16 13.77 * 14.37 14.17 * Tier 1 leverage (1) 9.32 9.32 9.35 9.35 8.35 8.35 8.39 8.39 *Denotes the lowest capital ratio as determined under the Advanced and Standardized Approaches. (1) The leverage ratio consists of Tier 1 capital divided by quarterly average total assets, excluding goodwill and certain other items.
Minimum Required Regulatory Capital Ratios (Transition Requirements) [Table Text Block]	Table 22.2 presents the minimum required regulatory capital ratios under Transition Requirements to which the Company and the Bank were subject as of March 31, 2018 and December 31, 2017 . Table 22.2: Minimum Required Regulatory Capital Ratios – Transition Requirements (1) Wells Fargo & Company Wells Fargo Bank, N.A. March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Regulatory capital ratios: Common equity tier 1 capital 7.875 % 6.750 6.375 5.750 Tier 1 capital 9.375 8.250 7.875 7.250 Total capital 11.375 10.250 9.875 9.250 Tier 1 leverage 4.000 4.000 4.000 4.000 (1) At March 31, 2018 , under transition requirements, the CET1, tier 1 and total capital minimum ratio requirements for Wells Fargo & Company include a capital conservation buffer of 1.875% and a global systemically important bank (G-SIB) surcharge of 1.500% . Only the 1.875% capital conservation buffer applies to the Bank at March 31, 2018 .

Summary of Significant Accoun53

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items]
Civil Money Penalty		$ 1,000
Supplemental cash flow information - Noncash activities
Trading debt securities retained from securitization of MHFS		8,776	$ 20,929
Transfers from loans to MHFS		1,297	1,657
Transfer of Portfolio Loans and Leases to Held-for-sale		1,973	479
Transfers from available-for-sale debt securities to held-to-maturity debt securities		4,451	9,897
Summary Of Significant Accounting Policies Textuals [Abstract]
Civil Money Penalty Legal Accrual		$ 800
Impact of Restatement on Earnings Per Share, Basic		$ 0.16
Private Forward Repurchase Transaction [Member]
Summary Of Significant Accounting Policies Textuals [Abstract]
Private forward repurchase contract		$ 0	$ 0
Accounting Standards Update 2016-04 [Member] | Retained Earnings [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		20
Accounting Standards Update 2016-01 [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	[1]			$ (24)
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		106		$ 94	[1]
Accounting Standards Update 2016-01 [Member] | Other Comprehensive Income Location [Domain]
Summary of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		118
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		(32)
Auction Rate Securities [Member] | Accounting Standards Update 2016-01 [Member]
Summary of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 12
[1]	(2)Effective January 1, 2018, we adopted ASU 2016-04 – Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products, ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, and ASU 2014-09 – Revenue from Contracts With Customers (Topic 606) and subsequent related Updates. See Note 1 (Summary of Significant Accounting Policies) in this Report for more information.

Business Combinations (Details)

Business Combinations (Details)	3 Months Ended
	Mar. 31, 2018business
Pending Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, number completed during period	0

Cash, Loan and Dividend Restr55

Cash, Loan and Dividend Restrictions (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 24, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Cash, Loan and Dividend Restrictions [Line Items]
Average Cash Reserve Deposit Required And Made Federal Reserve Banks		$ 12,025		$ 12,306
Common Stock, Dividends, Per Share, Declared		$ 0.39	$ 0.38
Reserve Balance for Non-US Central Banks [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents		$ 427		617
Segregated for benefit brokerage customers under federal and other brokerage regulations f[Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents		574		666
Related to consolidated variable interest entities (VIEs) that can only be used to settle liabilities of VIEs [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents		119		$ 487
Bank Subsidiaries [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval		14,200
Nonbank Subsidiaries [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval		$ 24,800
Subsequent Event [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.39

Trading Assets and Liabilities

Trading Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Trading Assets and Liabilities [Line Items]
Trading debt securities	$ 59,866	$ 57,624	[1]
Trading equity securities	25,327	30,004
Loans held for sale	3,581	1,131	[1]
Derivative assets	36,334	36,355
Net amounts in consolidated balance sheet, assets	11,467	12,228
Total trading assets	97,420	100,362
Gross trading derivative liabilities	32,672	34,298
Net amounts in consolidated balance sheet, liabilities	7,883	8,796
Total trading liabilities	30,451	26,796
Held for Trading [Member]
Trading Assets and Liabilities [Line Items]
Loans held for sale	1,695	1,023
Derivative assets	30,644	31,340
Netting, derivative assets (1)	(20,112)	(19,629)
Net amounts in consolidated balance sheet, assets	10,532	11,711
Short sales	23,303	18,472
Gross trading derivative liabilities	29,717	31,386
Netting, derivative liabilities (1)	(22,569)	(23,062)
Net amounts in consolidated balance sheet, liabilities	$ 7,148	$ 8,324
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Net Interest Income and Net Gai

Net Interest Income and Net Gains (Losses) on Trading Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Interest Income and Net Gains (Losses) on Trading Activities [Line Items]
Debt Securities, interest income	$ 631	$ 513
Equity Securities, interest income	231	175	[1]
Loans held for sale, interest income	24	10	[1]
Total interest income	15,347	14,213	[2]
Total interest expense	128	93
Net interest income	12,238	12,324	[2]
Debt securities, net gains (losses)	(499)	149
Equity securities, net gains (losses)	(469)	927
Loans held for sale, net gain (losses)	8	24
Derivatives (3)	1,203	(828)
Total net gains from trading activities (4)	243	272	[1]
Total trading-related net interest and noninterest income	895	815
Held for Trading [Member]
Net Interest Income and Net Gains (Losses) on Trading Activities [Line Items]
Equity Securities, interest income	141	114
Loans held for sale, interest income	8	9
Total interest income	780	636
Net interest income	$ 652	$ 543
[1]	(1)Financial information for the prior period has been revised to reflect the impact of the adoption of Accounting Standards Update (ASU) 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

AFS and HTM Debt Securities, Ma

AFS and HTM Debt Securities, Major Categories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale debt securities:
Amortized Cost	$ 273,588	$ 275,096
Gross unrealized gains	2,516	3,182
Gross unrealized losses	(4,448)	(1,871)
Fair value	271,656	276,407	[1]
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	141,446	139,335
Gross unrealized gains	64	478
Gross unrealized losses	(3,187)	(828)
Held-to-maturity, at fair value	138,323	138,985
Total investment securities:
Amortized Cost	415,034	414,431
Gross unrealized gains	2,580	3,660
Gross unrealized losses	(7,635)	(2,699)
Fair value	409,979	415,392
Held-to-maturity, at fair value	138,323	138,985
Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale debt securities:
Amortized Cost	6,426	6,425
Gross unrealized gains	1	2
Gross unrealized losses	(148)	(108)
Fair value	6,279	6,319
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	44,727	44,720
Gross unrealized gains	0	189
Gross unrealized losses	(548)	(103)
Held-to-maturity, at fair value	44,179	44,806
Total investment securities:
Held-to-maturity, at fair value	44,179	44,806
Collateralized Debt Obligations [Member]
Available-for-sale debt securities:
Amortized Cost	869	887
Fair value	1,000	1,000
Asset-backed Securities, Securitized Loans and Receivables [Member]
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	97	114
Held-to-maturity, at fair value	97	114
Total investment securities:
Held-to-maturity, at fair value	97	114
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale debt securities:
Amortized Cost	49,117	50,733
Gross unrealized gains	939	1,032
Gross unrealized losses	(413)	(439)
Fair value	49,643	51,326
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	6,307	6,313
Gross unrealized gains	26	84
Gross unrealized losses	(102)	(43)
Held-to-maturity, at fair value	6,231	6,354
Total investment securities:
Held-to-maturity, at fair value	6,231	6,354
Federal agencies [Member]
Available-for-sale debt securities:
Amortized Cost	160,216	160,561
Gross unrealized gains	431	930
Gross unrealized losses	(3,833)	(1,272)
Fair value	156,814	160,219
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	89,748	87,527
Gross unrealized gains	35	201
Gross unrealized losses	(2,537)	(682)
Held-to-maturity, at fair value	87,246	87,046
Total investment securities:
Held-to-maturity, at fair value	87,246	87,046
Residential [Member]
Available-for-sale debt securities:
Amortized Cost	4,233	4,356
Gross unrealized gains	243	254
Gross unrealized losses	(2)	(2)
Fair value	4,474	4,608
Commercial [Member]
Available-for-sale debt securities:
Amortized Cost	4,722	4,487
Gross unrealized gains	78	80
Gross unrealized losses	(10)	(2)
Fair value	4,790	4,565
Mortgage-Backed Securities [Member]
Available-for-sale debt securities:
Amortized Cost	169,171	169,404
Gross unrealized gains	752	1,264
Gross unrealized losses	(3,845)	(1,276)
Fair value	166,078	169,392
Corporate debt securities [Member]
Available-for-sale debt securities:
Amortized Cost	6,918	7,343
Gross unrealized gains	299	363
Gross unrealized losses	(34)	(40)
Fair value	7,183	7,666
Collateralized Loan Obligations [Member]
Available-for-sale debt securities:
Amortized Cost	36,360	35,675
Gross unrealized gains	394	384
Gross unrealized losses	(2)	(3)
Fair value	36,752	36,056
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	567	661
Gross unrealized gains	3	4
Gross unrealized losses	0	0
Held-to-maturity, at fair value	570	665
Total investment securities:
Held-to-maturity, at fair value	570	665
Other [Member]
Available-for-sale debt securities:
Amortized Cost	5,596	5,516
Gross unrealized gains	131	137
Gross unrealized losses	(6)	(5)
Fair value	5,721	5,648
Held-to-maturity debt securities:
Held-to-maturity securities, Amortized Cost	97	114
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Held-to-maturity, at fair value	97	114
Total investment securities:
Held-to-maturity, at fair value	$ 97	$ 114
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

AFS and HTM Debt Securities, Gr

AFS and HTM Debt Securities, Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	$ (2,315)	$ (295)
Less than 12 months, Fair value, available-for-sale	115,590	63,600
12 months or more, Gross unrealized losses, available-for-sale	(2,133)	(1,576)
12 months or more, Fair value, available-for-sale	51,968	59,989
Total, Gross unrealized losses, available-for-sale	(4,448)	(1,871)
Total Fair Value, available for sale	167,558	123,589
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	(1,941)	(272)
Less than 12 months, Fair value, held-to-maturity	103,750	41,468
12 months or more, Gross unrealized losses, held-to-maturity	(1,246)	(556)
12 months or more, Fair value, held-to-maturity	30,113	31,417
Total, Gross unrealized losses, held-to-maturity	(3,187)	(828)
Total, Fair value, held-to-maturity	133,863	72,885
Total AFS and HTM debt securities:
Less than 12 months, Gross unrealized losses, investment securities	(4,256)	(567)
Less than 12 months, Fair value, investment securities	219,340	105,068
12 months or more, Gross unrealized losses, investment securities	(3,379)	(2,132)
12 months or more, Fair value, investment securities	82,081	91,406
Total, Gross unrealized losses, investment securities	(7,635)	(2,699)
Total, Fair value, investment securities	301,421	196,474
Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(56)	(27)
Less than 12 months, Fair value, available-for-sale	4,037	4,065
12 months or more, Gross unrealized losses, available-for-sale	(92)	(81)
12 months or more, Fair value, available-for-sale	2,203	2,209
Total, Gross unrealized losses, available-for-sale	(148)	(108)
Total Fair Value, available for sale	6,240	6,274
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	(494)	(69)
Less than 12 months, Fair value, held-to-maturity	42,710	11,255
12 months or more, Gross unrealized losses, held-to-maturity	(54)	(34)
12 months or more, Fair value, held-to-maturity	1,469	1,490
Total, Gross unrealized losses, held-to-maturity	(548)	(103)
Total, Fair value, held-to-maturity	44,179	12,745
Securities of U.S. states and political subdivisions [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(26)	(17)
Less than 12 months, Fair value, available-for-sale	5,292	6,179
12 months or more, Gross unrealized losses, available-for-sale	(387)	(422)
12 months or more, Fair value, available-for-sale	10,526	11,766
Total, Gross unrealized losses, available-for-sale	(413)	(439)
Total Fair Value, available for sale	15,818	17,945
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	(36)	(5)
Less than 12 months, Fair value, held-to-maturity	2,967	500
12 months or more, Gross unrealized losses, held-to-maturity	(66)	(38)
12 months or more, Fair value, held-to-maturity	1,653	1,683
Total, Gross unrealized losses, held-to-maturity	(102)	(43)
Total, Fair value, held-to-maturity	4,620	2,183
Mortgage-Backed Securities [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(2,221)	(245)
Less than 12 months, Fair value, available-for-sale	103,952	52,707
12 months or more, Gross unrealized losses, available-for-sale	(1,624)	(1,031)
12 months or more, Fair value, available-for-sale	38,359	44,882
Total, Gross unrealized losses, available-for-sale	(3,845)	(1,276)
Total Fair Value, available for sale	142,311	97,589
Federal agencies [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(2,211)	(243)
Less than 12 months, Fair value, available-for-sale	103,361	52,559
12 months or more, Gross unrealized losses, available-for-sale	(1,622)	(1,029)
12 months or more, Fair value, available-for-sale	38,197	44,691
Total, Gross unrealized losses, available-for-sale	(3,833)	(1,272)
Total Fair Value, available for sale	141,558	97,250
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	(1,411)	(198)
Less than 12 months, Fair value, held-to-maturity	58,073	29,713
12 months or more, Gross unrealized losses, held-to-maturity	(1,126)	(484)
12 months or more, Fair value, held-to-maturity	26,991	28,244
Total, Gross unrealized losses, held-to-maturity	(2,537)	(682)
Total, Fair value, held-to-maturity	85,064	57,957
Residential [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(1)	(1)
Less than 12 months, Fair value, available-for-sale	161	47
12 months or more, Gross unrealized losses, available-for-sale	(1)	(1)
12 months or more, Fair value, available-for-sale	53	58
Total, Gross unrealized losses, available-for-sale	(2)	(2)
Total Fair Value, available for sale	214	105
Commercial [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(9)	(1)
Less than 12 months, Fair value, available-for-sale	430	101
12 months or more, Gross unrealized losses, available-for-sale	(1)	(1)
12 months or more, Fair value, available-for-sale	109	133
Total, Gross unrealized losses, available-for-sale	(10)	(2)
Total Fair Value, available for sale	539	234
Corporate debt securities [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(10)	(4)
Less than 12 months, Fair value, available-for-sale	664	239
12 months or more, Gross unrealized losses, available-for-sale	(24)	(36)
12 months or more, Fair value, available-for-sale	395	503
Total, Gross unrealized losses, available-for-sale	(34)	(40)
Total Fair Value, available for sale	1,059	742
Collateralized loan and other debt obligations [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(1)	(1)
Less than 12 months, Fair value, available-for-sale	1,476	373
12 months or more, Gross unrealized losses, available-for-sale	(1)	(2)
12 months or more, Fair value, available-for-sale	162	146
Total, Gross unrealized losses, available-for-sale	(2)	(3)
Total Fair Value, available for sale	1,638	519
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	0	0
Less than 12 months, Fair value, held-to-maturity	0	0
12 months or more, Gross unrealized losses, held-to-maturity	0	0
12 months or more, Fair value, held-to-maturity	0	0
Total, Gross unrealized losses, held-to-maturity	0	0
Total, Fair value, held-to-maturity	0	0
Other [Member]
Available-for-sale debt securities:
Less than 12 months, Gross unrealized losses, available-for-sale	(1)	(1)
Less than 12 months, Fair value, available-for-sale	169	37
12 months or more, Gross unrealized losses, available-for-sale	(5)	(4)
12 months or more, Fair value, available-for-sale	323	483
Total, Gross unrealized losses, available-for-sale	(6)	(5)
Total Fair Value, available for sale	492	520
Held-to-maturity debt securities:
Less than 12 months, Gross unrealized losses, held-to-maturity	0	0
Less than 12 months, Fair value, held-to-maturity	0	0
12 months or more, Gross unrealized losses, held-to-maturity	0	0
12 months or more, Fair value, held-to-maturity	0	0
Total, Gross unrealized losses, held-to-maturity	0	0
Total, Fair value, held-to-maturity	$ 0	$ 0

AFS and HTM Debt Securities, Un

AFS and HTM Debt Securities, Unrealized Loss Position, by Credit Rating (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale debt securities:
Gross unrealized losses	$ (4,448)	$ (1,871)
Fair value	271,656	276,407	[1]
Held-to-maturity debt securities:
Gross unrealized losses	(3,187)	(828)
Fair value	138,323	138,985
Total AFS and HTM debt securities:
Gross unrealized losses	(7,635)	(2,699)
Fair value	409,979	415,392
Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	(148)	(108)
Fair value	6,279	6,319
Held-to-maturity debt securities:
Gross unrealized losses	(548)	(103)
Fair value	44,179	44,806
Securities of U.S. states and political subdivisions [Member]
Available-for-sale debt securities:
Gross unrealized losses	(413)	(439)
Fair value	49,643	51,326
Held-to-maturity debt securities:
Gross unrealized losses	(102)	(43)
Fair value	6,231	6,354
Mortgage-Backed Securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(3,845)	(1,276)
Fair value	166,078	169,392
Federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	(3,833)	(1,272)
Fair value	156,814	160,219
Held-to-maturity debt securities:
Gross unrealized losses	(2,537)	(682)
Fair value	87,246	87,046
Residential [Member]
Available-for-sale debt securities:
Gross unrealized losses	(2)	(2)
Fair value	4,474	4,608
Commercial [Member]
Available-for-sale debt securities:
Gross unrealized losses	(10)	(2)
Fair value	4,790	4,565
Corporate debt securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(34)	(40)
Fair value	7,183	7,666
Collateralized loan and other debt obligations [Member]
Available-for-sale debt securities:
Gross unrealized losses	(2)	(3)
Fair value	36,752	36,056
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	570	665
Other [Member]
Available-for-sale debt securities:
Gross unrealized losses	(6)	(5)
Fair value	5,721	5,648
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	97	114
Unrated Investment Grade Securities [Member]
Total AFS and HTM debt securities:
Gross unrealized losses	(25)	(32)
Fair value	5,000	6,900
Investment grade [Member]
Available-for-sale debt securities:
Gross unrealized losses	(4,392)	(1,812)
Fair value	166,325	122,804
Held-to-maturity debt securities:
Gross unrealized losses	(3,179)	(826)
Fair value	133,494	72,717
Total AFS and HTM debt securities:
Gross unrealized losses	(7,571)	(2,638)
Fair value	299,819	195,521
Investment grade [Member] | Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	(148)	(108)
Fair value	6,240	6,274
Held-to-maturity debt securities:
Gross unrealized losses	(548)	(103)
Fair value	44,179	12,745
Investment grade [Member] | Securities of U.S. states and political subdivisions [Member]
Available-for-sale debt securities:
Gross unrealized losses	(392)	(412)
Fair value	15,551	17,763
Held-to-maturity debt securities:
Gross unrealized losses	(102)	(43)
Fair value	4,620	2,183
Investment grade [Member] | Mortgage-Backed Securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(3,836)	(1,274)
Fair value	142,083	97,475
Investment grade [Member] | Federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	(3,833)	(1,272)
Fair value	141,558	97,250
Held-to-maturity debt securities:
Gross unrealized losses	(2,529)	(680)
Fair value	84,695	57,789
Investment grade [Member] | Residential [Member]
Available-for-sale debt securities:
Gross unrealized losses	(1)	(1)
Fair value	146	42
Investment grade [Member] | Commercial [Member]
Available-for-sale debt securities:
Gross unrealized losses	(2)	(1)
Fair value	379	183
Investment grade [Member] | Corporate debt securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(10)	(13)
Fair value	370	304
Investment grade [Member] | Collateralized loan and other debt obligations [Member]
Available-for-sale debt securities:
Gross unrealized losses	(2)	(3)
Fair value	1,638	519
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Investment grade [Member] | Other [Member]
Available-for-sale debt securities:
Gross unrealized losses	(4)	(2)
Fair value	443	469
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Non-investment grade [Member]
Available-for-sale debt securities:
Gross unrealized losses	(56)	(59)
Fair value	1,233	785
Held-to-maturity debt securities:
Gross unrealized losses	(8)	(2)
Fair value	369	168
Total AFS and HTM debt securities:
Gross unrealized losses	(64)	(61)
Fair value	1,602	953
Non-investment grade [Member] | Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Non-investment grade [Member] | Securities of U.S. states and political subdivisions [Member]
Available-for-sale debt securities:
Gross unrealized losses	(21)	(27)
Fair value	267	182
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Non-investment grade [Member] | Mortgage-Backed Securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(9)	(2)
Fair value	228	114
Non-investment grade [Member] | Federal agencies [Member]
Available-for-sale debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Held-to-maturity debt securities:
Gross unrealized losses	(8)	(2)
Fair value	369	168
Non-investment grade [Member] | Residential [Member]
Available-for-sale debt securities:
Gross unrealized losses	(1)	(1)
Fair value	68	63
Non-investment grade [Member] | Commercial [Member]
Available-for-sale debt securities:
Gross unrealized losses	(8)	(1)
Fair value	160	51
Non-investment grade [Member] | Corporate debt securities [Member]
Available-for-sale debt securities:
Gross unrealized losses	(24)	(27)
Fair value	689	438
Non-investment grade [Member] | Collateralized loan and other debt obligations [Member]
Available-for-sale debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	0	0
Non-investment grade [Member] | Other [Member]
Available-for-sale debt securities:
Gross unrealized losses	(2)	(3)
Fair value	49	51
Held-to-maturity debt securities:
Gross unrealized losses	0	0
Fair value	$ 0	$ 0
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

AFS and HTM Debt Securities, Co

AFS and HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 271,656	$ 276,407	[1]
Weighted average yield contractual maturities, Total, available-for-sale	3.56%	3.72%
Due within 1 year, Contractual maturities, available-for-sale	$ 2,614	$ 2,990
Percentage of weighted average yield, Due within 1 year, available-for-sale	2.98%	3.70%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 17,951	$ 19,158
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	2.92%	3.11%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 29,255	$ 28,059
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	3.28%	3.24%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 221,836	$ 226,200
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.66%	3.83%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 141,446	$ 139,335
Weighted average yield contractual maturities, Total, held-to-maturity, cost	2.87%	2.92%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 32,498	$ 32,509
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	2.05%	2.05%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 13,762	$ 13,757
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	2.52%	2.55%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 95,186	$ 93,069
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	3.20%	3.28%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 138,323	$ 138,985
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	32,175	32,566
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	13,534	13,795
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	92,614	92,624
Securities of U.S. Treasury and federal agencies [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 6,279	$ 6,319
Weighted average yield contractual maturities, Total, available-for-sale	1.59%	1.59%
Due within 1 year, Contractual maturities, available-for-sale	$ 117	$ 81
Percentage of weighted average yield, Due within 1 year, available-for-sale	1.60%	1.37%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 6,114	$ 6,189
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	1.59%	1.59%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 48	$ 49
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	1.90%	1.89%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 0	$ 0
Percentage of weighted average yield, Due after 10 years, available-for-sale	0.00%	0.00%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 44,727	$ 44,720
Weighted average yield contractual maturities, Total, held-to-maturity, cost	2.12%	2.12%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 32,336	$ 32,330
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	2.04%	2.04%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 12,391	$ 12,390
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	2.32%	2.32%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 44,179	$ 44,806
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	32,014	32,388
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	12,165	12,418
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	0	0
Securities of U.S. states and political subdivisions [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 49,643	$ 51,326
Weighted average yield contractual maturities, Total, available-for-sale	4.75%	5.88%
Due within 1 year, Contractual maturities, available-for-sale	$ 2,089	$ 2,380
Percentage of weighted average yield, Due within 1 year, available-for-sale	2.70%	3.47%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 8,343	$ 9,484
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	3.05%	3.42%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 4,293	$ 2,276
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	3.16%	4.63%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 34,918	$ 37,186
Percentage of weighted average yield, Due after 10 years, available-for-sale	5.48%	6.75%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 6,307	$ 6,313
Weighted average yield contractual maturities, Total, held-to-maturity, cost	4.93%	6.02%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 50	$ 50
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	5.88%	7.18%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 793	$ 695
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	5.16%	6.31%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 5,464	$ 5,568
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	4.89%	5.98%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 6,231	$ 6,354
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	49	49
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	788	701
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	5,394	5,604
Mortgage-Backed Securities [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 166,078	$ 169,392
Weighted average yield contractual maturities, Total, available-for-sale	3.30%	3.28%
Due within 1 year, Contractual maturities, available-for-sale	$ 7	$ 15
Percentage of weighted average yield, Due within 1 year, available-for-sale	2.06%	2.03%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 217	$ 234
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	3.54%	3.35%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 5,366	$ 5,711
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	2.83%	2.82%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 160,488	$ 163,432
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.32%	3.30%
Federal agencies [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 156,814	$ 160,219
Weighted average yield contractual maturities, Total, available-for-sale	3.29%	3.27%
Due within 1 year, Contractual maturities, available-for-sale	$ 7	$ 15
Percentage of weighted average yield, Due within 1 year, available-for-sale	2.06%	2.03%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 194	$ 210
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	3.29%	3.08%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 5,139	$ 5,534
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	2.81%	2.82%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 151,474	$ 154,460
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.30%	3.28%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 89,748	$ 87,527
Weighted average yield contractual maturities, Total, held-to-maturity, cost	3.10%	3.11%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 15	$ 15
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	2.70%	2.81%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 11	$ 11
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	2.62%	2.49%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 89,722	$ 87,501
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	3.10%	3.11%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 87,246	$ 87,046
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	15	15
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	11	11
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	87,220	87,020
Residential [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 4,474	$ 4,608
Weighted average yield contractual maturities, Total, available-for-sale	3.61%	3.52%
Due within 1 year, Contractual maturities, available-for-sale	$ 0	$ 0
Percentage of weighted average yield, Due within 1 year, available-for-sale	0.00%	0.00%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 23	$ 24
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	5.70%	5.67%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 8	$ 11
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	2.36%	2.46%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 4,443	$ 4,573
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.60%	3.51%
Commercial [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 4,790	$ 4,565
Weighted average yield contractual maturities, Total, available-for-sale	3.45%	3.45%
Due within 1 year, Contractual maturities, available-for-sale	$ 0	$ 0
Percentage of weighted average yield, Due within 1 year, available-for-sale	0.00%	0.00%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 0	$ 0
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	0.00%	0.00%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 219	$ 166
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	3.10%	2.69%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 4,571	$ 4,399
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.46%	3.48%
Corporate debt securities [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 7,183	$ 7,666
Weighted average yield contractual maturities, Total, available-for-sale	5.11%	5.12%
Due within 1 year, Contractual maturities, available-for-sale	$ 335	$ 443
Percentage of weighted average yield, Due within 1 year, available-for-sale	5.08%	5.54%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 2,658	$ 2,738
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	5.48%	5.56%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 3,280	$ 3,549
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	4.73%	4.70%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 910	$ 936
Percentage of weighted average yield, Due after 10 years, available-for-sale	5.38%	5.26%
Collateralized loan and other debt obligations [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 36,752	$ 36,056
Weighted average yield contractual maturities, Total, available-for-sale	3.29%	2.98%
Due within 1 year, Contractual maturities, available-for-sale	$ 0	$ 0
Percentage of weighted average yield, Due within 1 year, available-for-sale	0.00%	0.00%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 37	$ 50
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	2.09%	1.68%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 14,788	$ 15,008
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	3.27%	2.96%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 21,927	$ 20,998
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.31%	3.00%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 567	$ 661
Weighted average yield contractual maturities, Total, held-to-maturity, cost	3.22%	2.86%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 0	$ 0
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	0.00%	0.00%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 567	$ 661
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	3.22%	2.86%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 570	$ 665
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	0	0
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	570	665
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	0	0
Other [Member]
Available-for-sale securities:
Contractual maturities, Total amount, available-for-sale	$ 5,721	$ 5,648
Weighted average yield contractual maturities, Total, available-for-sale	2.85%	2.46%
Due within 1 year, Contractual maturities, available-for-sale	$ 66	$ 71
Percentage of weighted average yield, Due within 1 year, available-for-sale	4.26%	3.56%
Due in 1-5 years, Contractual maturities, available-for-sale	$ 582	$ 463
Percentage of weighted average yield, Due in 1-5 years, available-for-sale	3.06%	2.72%
Due in 5-10 years, Contractual maturities, available-for-sale	$ 1,480	$ 1,466
Percentage of weighted average yield, Due In 5-10 years, available-for-sale	2.34%	2.13%
Due in 10 years or more, Contractual maturities, available-for-sale	$ 3,593	$ 3,648
Percentage of weighted average yield, Due after 10 years, available-for-sale	3.00%	2.53%
Held-to-maturity securities:
Held-to-maturity securities, Amortized Cost	$ 97	$ 114
Weighted average yield contractual maturities, Total, held-to-maturity, cost	1.83%	1.83%
Due within 1 year, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 1 year, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	$ 97	$ 114
Percentage of weighted average yield, Due In 1-5 years, held-to-maturity, cost	1.83%	1.83%
Due in 5-10 years, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due In 5-10 years, held-to-maturity, cost	0.00%	0.00%
Due in 10 years or more, Contractual maturities, held-to-maturity, cost	$ 0	$ 0
Percentage of weighted average yield, Due after 10 years, held-to-maturity, cost	0.00%	0.00%
Held-to-maturity securities, fair value: [Abstract]
Contractual maturities, Total amount, held-to-maturity, fair value	$ 97	$ 114
Due within 1 year, Contractual maturities, held-to-maturity, fair value	0	0
Due in 1-5 years, Contractual maturities, held-to-maturity, fair value	97	114
Due in 5-10 years, Contractual maturities, held-to-maturity, fair value	0	0
Due in 10 years or more, Contractual maturities, held-to-maturity, fair value	$ 0	$ 0
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

AFS and HTM Debt Securities, Re

AFS and HTM Debt Securities, Realized Gains and Losses (Details) - Debt securities [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Available-For-Sale Debt Securities, Realized Gain (Loss) [Abstract]
Gross realized gains	$ 21	$ 124
Gross realized losses	(10)	(36)
OTTI write-downs	(10)	(52)
Net realized gains from available-for-sale debt securities	$ 1	$ 36

AFS and HTM Debt Securities, OT

AFS and HTM Debt Securities, OTTI Included in Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Available-For-Sale Debt Securities [Line Items]
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities	$ 0	$ 0
Debt securities [Member]
OTTI write-downs included in earnings (Abstract)
Total debt securities (1)	10	52
Securities of U.S. states and political subdivisions [Member]
OTTI write-downs included in earnings (Abstract)
Total debt securities (1)	2	8
Corporate debt securities [Member]
OTTI write-downs included in earnings (Abstract)
Total debt securities (1)	0	16
Residential [Member]
OTTI write-downs included in earnings (Abstract)
Total debt securities (1)	1	3
Commercial [Member]
OTTI write-downs included in earnings (Abstract)
Total debt securities (1)	$ 7	$ 25

AFS and HTM Debt Securities, 64

AFS and HTM Debt Securities, OTTI Debt Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Debt securities [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	$ 10	$ 52
Total changes to OCI for non-credit-related OTTI	7	(9)
Total OTTI losses recorded on debt securities	17	43
Securities of U.S. states and political subdivisions [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	2	8
Total changes to OCI for non-credit-related OTTI	(2)	(5)
Residential [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	1	3
Total changes to OCI for non-credit-related OTTI	(1)	3
Commercial [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	7	25
Total changes to OCI for non-credit-related OTTI	10	(7)
Corporate debt securities [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	0	16
Credit-related OTTI [Member] | Debt securities [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	9	52
Intent-to-sell OTTI [Member] | Debt securities [Member]
OTTI on debt securities (Abstract)
Total recorded as part of gross realized losses	$ 1	$ 0

AFS and HTM Debt Securities, Cr

AFS and HTM Debt Securities, Credit Loss Component (Details) - Debt securities [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Credit loss recognized, beginning of period	$ 742	$ 1,043
Additions:
For securities with initial credit impairments	0	6
For securities with previous credit impairments	9	46
Total additions	9	52
Reductions:
For securities sold, matured, or intended/required to be sold	(101)	(7)
For recoveries of previous credit impairments	(1)	(2)
Total reductions	(102)	(9)
Credit loss recognized, end of period	$ 649	$ 1,086

Loans and Allowance for Credi66

Loans and Allowance for Credit Losses, Loans Outstanding (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Temporary Advance Arrangements		$ 89,000	$ 85,000
Loans and Leases Receivable, Deferred Income		3,200	3,900
Loans	[1]	947,308	956,770
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		503,396	503,388
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		334,678	333,125
Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		125,543	126,599
Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		23,882	24,279
Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		19,293	19,385
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		443,912	453,382
Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		282,658	284,054
Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,920	39,713
Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		36,103	37,976
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		49,554	53,371
Other revolving credit and installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,677	38,268
Geographic Distribution, Foreign [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		69,523	69,920
Geographic Distribution, Foreign [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		59,696	60,106
Geographic Distribution, Foreign [Member] | Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		8,082	8,033
Geographic Distribution, Foreign [Member] | Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		668	655
Geographic Distribution, Foreign [Member] | Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,077	1,126
International [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Letters of Credit Outstanding, Amount		$ 1,100	$ 982
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi67

Loans and Allowance for Credit Losses, Significant Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	$ 256	$ 1,161
Sales	(460)	(349)
Transfers to MHFS/LHFS	(1,973)	(479)
Commercial Portfolio Segment [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	256	1,159
Sales	(460)	(287)
Transfers to MHFS/LHFS	(420)	(479)
Consumer Portfolio Segment [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	0	2
Sales	0	(62)
Transfers to MHFS/LHFS	$ (1,553)	$ 0

Loans and Allowance for Credi68

Loans and Allowance for Credit Losses, Commitments to Lend (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Temporary Advance Arrangements	$ 89,000	$ 85,000
Total unfunded credit commitments	558,035	555,511
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	325,091	326,626
Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	7,233	7,485
Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	15,612	16,621
Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	0	0
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	347,936	350,732
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	210,099	204,779
Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	32,220	29,876
Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	38,817	38,897
Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	111,427	108,465
Other revolving credit and installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unfunded credit commitments	27,635	27,541
International [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Letters of Credit International	$ 1,100	$ 982

Loans and Allowance for Credi69

Loans and Allowance for Credit Losses, Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 11,960	$ 12,540
Provision for credit losses	191	605
Interest income on certain impaired loans	(43)	(48)
Loan charge-offs	(1,156)	(1,238)
Loan recoveries	415	433
Net loan charge-offs	(741)	(805)
Other	(54)	(5)
Allowance for credit losses, ending balance	11,313	12,287
Components:
Allowance for loan losses			$ 10,373	$ 11,004	$ 11,168
Allowance for unfunded credit commitments			940		1,119
Total allowance for credit losses	$ 11,960	$ 12,540	$ 11,313	11,960	$ 12,287
Net loan charge-offs (annualized) as a percentage of average total loans	0.32%	0.34%
Allowance for loan losses as a percentage of total loans			1.10%		1.17%
Allowance for credit losses as a percentage of total loans			1.19%		1.28%
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 6,632	$ 7,394
Provision for credit losses	169	(89)
Interest income on certain impaired loans	(11)	(15)
Loan charge-offs	(183)	(265)
Loan recoveries	105	122
Net loan charge-offs	(78)	(143)
Other	(4)	(5)
Allowance for credit losses, ending balance	6,708	7,142
Components:
Total allowance for credit losses	6,632	7,394	$ 6,708	6,632	$ 7,142
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(164)	(253)
Loan recoveries	79	82
Commercial real estate mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(2)	(5)
Loan recoveries	17	30
Commercial Real Estate Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	0	0
Loan recoveries	4	8
Commercial Lease Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(17)	(7)
Loan recoveries	5	2
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,328	5,146
Provision for credit losses	22	694
Interest income on certain impaired loans	(32)	(33)
Loan charge-offs	(973)	(973)
Loan recoveries	310	311
Net loan charge-offs	(663)	(662)
Other	(50)	0
Allowance for credit losses, ending balance	4,605	5,145
Components:
Total allowance for credit losses	5,328	5,146	$ 4,605	$ 5,328	$ 5,145
Real estate 1-4 family first mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(41)	(69)
Loan recoveries	59	62
Real estate 1-4 family junior lien mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(47)	(93)
Loan recoveries	55	70
Credit Card [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(405)	(367)
Loan recoveries	73	58
Automobile [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(300)	(255)
Loan recoveries	92	88
Other revolving credit and installment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loan charge-offs	(180)	(189)
Loan recoveries	$ 31	$ 33

Loans and Allowance for Credi70

Loans and Allowance for Credit Losses, Allowance Activity by Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 11,960	$ 12,540
Provision for credit losses	191	605
Interest income on certain impaired loans	(43)	(48)
Loan charge-offs	(1,156)	(1,238)
Loan recoveries	415	433
Net loan charge-offs	(741)	(805)
Other	(54)	(5)
Allowance for credit losses, ending balance	11,313	12,287
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,632	7,394
Provision for credit losses	169	(89)
Interest income on certain impaired loans	(11)	(15)
Loan charge-offs	(183)	(265)
Loan recoveries	105	122
Net loan charge-offs	(78)	(143)
Other	(4)	(5)
Allowance for credit losses, ending balance	6,708	7,142
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,328	5,146
Provision for credit losses	22	694
Interest income on certain impaired loans	(32)	(33)
Loan charge-offs	(973)	(973)
Loan recoveries	310	311
Net loan charge-offs	(663)	(662)
Other	(50)	0
Allowance for credit losses, ending balance	$ 4,605	$ 5,145

Loans and Allowance for Credi71

Loans and Allowance for Credit Losses, Allowance by Credit Impairment Methodology (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated		$ 9,609	$ 10,070
Allowance for Credit Losses, Individually evaluated		1,694	1,890
Total allowance for credit losses		11,313	11,960	$ 12,287	$ 12,540
Financing Receivable, Collectively evaluated		918,455	925,261
Financing Receivable, Individually evaluated		18,144	18,674
Loans	[1]	947,308	956,770
Commercial Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated		6,029	5,927
Allowance for Credit Losses, Individually evaluated		669	705
Total allowance for credit losses		6,708	6,632	7,142	7,394
Financing Receivable, Collectively evaluated		499,578	499,342
Financing Receivable, Individually evaluated		3,743	3,960
Loans		503,396	503,388
Consumer Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated		3,580	4,143
Allowance for Credit Losses, Individually evaluated		1,025	1,185
Total allowance for credit losses		4,605	5,328	$ 5,145	$ 5,146
Financing Receivable, Collectively evaluated		418,877	425,919
Financing Receivable, Individually evaluated		14,401	14,714
Loans		443,912	453,382
PCI Loans Carrying Value [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Financing Receivable, Recorded Investment, Current		10,709	12,835
PCI Loans Carrying Value [Member] | Commercial Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Financing Receivable, Recorded Investment, Current		75	86
PCI Loans Carrying Value [Member] | Consumer Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Financing Receivable, Recorded Investment, Current		10,634	12,749
Allowance for Doubtful Accounts [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Total allowance for credit losses		10	0
Allowance for Doubtful Accounts [Member] | Commercial Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Total allowance for credit losses		10	0
Allowance for Doubtful Accounts [Member] | Consumer Portfolio Segment [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Total allowance for credit losses		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi72

Loans and Allowance for Credit Losses, Loans by Credit Quality Indicator, Commercial (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
Loans and Leases Receivable Disclosure [Abstract]
Loans	[1]	$ 947,308	$ 956,770
Total Commercial [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		503,396	503,388
Commercial and Industrial Loans [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		334,678	333,125
Commercial real estate mortgage [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		125,543	126,599
Commercial Real Estate Construction [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		23,882	24,279
Commercial Lease Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		19,293	19,385
Loans Excluding Purchased Credit-Impaired Loans [Member]
Loans and Leases Receivable Disclosure [Abstract]
Financing Receivable, Recorded Investment, Nonaccrual Status		7,719	8,036
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage and Construction Loans [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		4,600
Financing Receivable, Recorded Investment, Nonaccrual Status		800
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		503,321	503,302
Financing Receivable, Recorded Investment, Nonaccrual Status		2,409	2,640
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member] | Pass [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		481,252	480,886
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		22,069	22,416
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		334,603	333,039
Financing Receivable, Recorded Investment, Nonaccrual Status		1,516	1,899
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member] | Pass [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		318,334	316,431
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		16,269	16,608
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		125,543	126,599
Financing Receivable, Recorded Investment, Nonaccrual Status		755	628
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member] | Pass [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		121,151	122,312
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		4,392	4,287
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		23,882	24,279
Financing Receivable, Recorded Investment, Nonaccrual Status		45	37
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member] | Pass [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		23,647	23,981
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		235	298
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		19,293	19,385
Financing Receivable, Recorded Investment, Nonaccrual Status		93	76
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member] | Pass [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		18,120	18,162
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member] | Criticized [Member]
Loans and Leases Receivable Disclosure [Abstract]
Loans		1,173	1,223
PCI Loans Carrying Value [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		10,709	12,835
PCI Loans Carrying Value [Member] | Total Commercial [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		75	86	$ 18,700
PCI Loans Carrying Value [Member] | Commercial and Industrial Loans [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		75	86
PCI Loans Carrying Value [Member] | Commercial real estate mortgage [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		0	0
PCI Loans Carrying Value [Member] | Commercial Real Estate Construction [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		0	0
PCI Loans Carrying Value [Member] | Commercial Lease Financing Receivable [Member]
Loans and Leases Receivable Disclosure [Abstract]
PCI loans		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi73

Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
By delinquency status:
Loans	[1]	$ 947,308	$ 956,770
Total Commercial [Member]
By delinquency status:
Loans		503,396	503,388
Commercial and Industrial Loans [Member]
By delinquency status:
Loans		334,678	333,125
Commercial real estate mortgage [Member]
By delinquency status:
Loans		125,543	126,599
Commercial Real Estate Construction [Member]
By delinquency status:
Loans		23,882	24,279
Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		19,293	19,385
Loans Excluding Purchased Credit-Impaired Loans [Member]
By delinquency status:
Over 90 DPD and still accruing		10,753	11,997
Nonaccrual loans		7,719	8,036
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Loans		503,321	503,302
Nonaccrual loans		2,409	2,640
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Loans		334,603	333,039
Nonaccrual loans		1,516	1,899
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Loans		125,543	126,599
Nonaccrual loans		755	628
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Loans		23,882	24,279
Nonaccrual loans		45	37
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		19,293	19,385
Nonaccrual loans		93	76
PCI Loans Carrying Value [Member]
By delinquency status:
PCI loans		10,709	12,835
PCI Loans Carrying Value [Member] | Total Commercial [Member]
By delinquency status:
PCI loans		75	86	$ 18,700
PCI Loans Carrying Value [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
PCI loans		75	86
PCI Loans Carrying Value [Member] | Commercial real estate mortgage [Member]
By delinquency status:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
PCI loans		0	0
Pass [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Loans		481,252	480,886
Pass [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Loans		318,334	316,431
Pass [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Loans		121,151	122,312
Pass [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Loans		23,647	23,981
Pass [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		18,120	18,162
Criticized [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Loans		22,069	22,416
Criticized [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Loans		16,269	16,608
Criticized [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Loans		4,392	4,287
Criticized [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Loans		235	298
Criticized [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		1,173	1,223
Current-29 days past due (DPD) and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Loans		499,363	499,216
Current-29 days past due (DPD) and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Loans		332,432	330,319
Current-29 days past due (DPD) and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Loans		124,148	125,642
Current-29 days past due (DPD) and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Loans		23,706	24,107
Current-29 days past due (DPD) and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		19,077	19,148
30-89 days past due and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Loans		1,485	1,397
30-89 days past due and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Loans		615	795
30-89 days past due and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Loans		617	306
30-89 days past due and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Loans		130	135
30-89 days past due and still accruing [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Loans		123	161
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By delinquency status:
Over 90 DPD and still accruing		967	1,063
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Over 90 DPD and still accruing		64	49
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Over 90 DPD and still accruing		40	26
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial real estate mortgage [Member]
By delinquency status:
Over 90 DPD and still accruing		23	23
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Over 90 DPD and still accruing		1	0
Loans Excluding Government Insured or Guaranteed Loans [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Lease Financing Receivable [Member]
By delinquency status:
Over 90 DPD and still accruing		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi74

Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
By delinquency status:
Loans	[1]	$ 947,308	$ 956,770
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90 days or more past due and still accruing		903	1,000
By delinquency status:
Loans		$ 443,912	$ 453,382
Real estate 1-4 family first mortgage [Member]
By delinquency status:
Financing Receivables Equal To Or Greater Than 180 Days Past Due Percentage Of Portfolio		0.40%	0.40%
Loans		$ 282,658	$ 284,054
Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		37,920	39,713
Credit Card [Member]
By delinquency status:
Loans		36,103	37,976
Automobile [Member]
By delinquency status:
Loans		49,554	53,371
Other revolving credit and installment [Member]
By delinquency status:
Loans		37,677	38,268
Loans Excluding Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90 days or more past due and still accruing		10,753	11,997
Loans Excluding Purchased Credit-Impaired Loans [Member] | Consumer Real Estate Loans Government Guaranteed Or Insured [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90 days or more past due and still accruing		9,786	10,934
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		433,278	440,633
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		272,049	271,332
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		37,895	39,686
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		36,103	37,976
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		49,554	53,371
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		37,677	38,268
PCI Loans Carrying Value [Member]
By delinquency status:
PCI loans		10,709	12,835
PCI Loans Carrying Value [Member] | Total Consumer [Member]
By delinquency status:
PCI loans		10,634	12,749	$ 40,100
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans		10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans		25	27
PCI Loans Carrying Value [Member] | Credit Card [Member]
By delinquency status:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Automobile [Member]
By delinquency status:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Other revolving credit and installment [Member]
By delinquency status:
PCI loans		0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Loans Government Guaranteed Or Insured [Member]
By delinquency status:
Loans		9,400	10,500
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
90 days or more past due and still accruing		2,800	3,000
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		411,242	416,858
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		253,542	251,786
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		37,046	38,746
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		35,198	36,996
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		48,136	51,445
Current-29 days past due (DPD) [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		37,320	37,885
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		3,092	4,056
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		1,449	1,893
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		273	336
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		244	287
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		991	1,385
30-59 DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		135	155
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		1,308	1,591
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		589	742
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		141	163
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		188	201
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		306	392
60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		84	93
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		744	890
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		290	369
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		93	103
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		167	192
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		116	146
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		78	80
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		718	734
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		279	308
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		104	95
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		304	298
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		4	3
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		27	30
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		1,379	1,361
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		1,105	1,091
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		238	243
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		2	2
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		1	0
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		33	25
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Loans		14,795	15,143
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Loans		14,795	15,143
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Loans		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi75

Loans and Allowance for Credit Losses, Loans by FICO Score, Consumer (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
By FICO:
Loans	[1]	$ 947,308	$ 956,770
Total Consumer [Member]
By FICO:
Loans		443,912	453,382
90 days or more past due and still accruing		903	1,000
Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		282,658	284,054
Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		37,920	39,713
Credit Card [Member]
By FICO:
Loans		36,103	37,976
Automobile [Member]
By FICO:
Loans		49,554	53,371
Other revolving credit and installment [Member]
By FICO:
Loans		37,677	38,268
Loans Excluding Purchased Credit-Impaired Loans [Member]
By FICO:
90 days or more past due and still accruing		10,753	11,997
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		433,278	440,633
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		272,049	271,332
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		37,895	39,686
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		36,103	37,976
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		49,554	53,371
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		37,677	38,268
PCI Loans Carrying Value [Member]
By FICO:
PCI loans		10,709	12,835
PCI Loans Carrying Value [Member] | Total Consumer [Member]
By FICO:
PCI loans		10,634	12,749	$ 40,100
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans		10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans		25	27
PCI Loans Carrying Value [Member] | Credit Card [Member]
By FICO:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Automobile [Member]
By FICO:
PCI loans		0	0
PCI Loans Carrying Value [Member] | Other revolving credit and installment [Member]
By FICO:
PCI loans		0	0
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		19,056	20,159
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		4,674	5,145
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		1,601	1,768
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		3,407	3,525
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		8,546	8,858
FICO less than 600 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		828	863
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		13,566	14,360
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		3,405	3,487
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		1,223	1,253
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		2,915	3,101
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		5,161	5,615
FICO 600-639 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		862	904
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		23,185	24,521
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		6,717	6,789
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		2,274	2,387
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		5,352	5,690
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		6,936	7,696
FICO 640-679 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		1,906	1,959
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		37,667	39,809
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		14,313	14,977
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		4,604	4,797
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		7,304	7,628
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		8,049	8,825
FICO 680-719 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		3,397	3,582
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		53,096	55,164
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		27,119	27,926
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		6,007	6,246
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		7,808	8,097
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		7,215	7,806
FICO 720-759 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		4,947	5,089
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		79,469	82,010
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		54,227	55,590
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		6,918	7,323
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		6,065	6,372
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		6,036	6,468
FICO 760-799 [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		6,223	6,257
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		174,430	171,167
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		141,351	136,729
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		14,506	15,144
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		2,922	2,994
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		7,399	7,845
FICO 800 or more [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		8,252	8,455
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		9,277	9,789
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		5,448	5,546
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		762	768
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		330	569
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		212	258
No FICO available [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		2,525	2,648
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		8,737	8,511
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		0	0
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		0	0
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		0	0
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		0	0
FICO not required [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		8,737	8,511
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By FICO:
Loans		14,795	15,143
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
Loans		14,795	15,143
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By FICO:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By FICO:
Loans		0	0
Government Insured or Guaranteed [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By FICO:
Loans		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi76

Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
High Value Properties, Threshold		$ 1
By LTV/CLTV:
Loans	[1]	947,308	$ 956,770
Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Nonaccrual loans		7,719	8,036
Residential Mortgage [Member]
By LTV/CLTV:
Loans		320,578	323,767
Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		309,944	311,018
Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
Loans		282,658	284,054
Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		272,049	271,332
Nonaccrual loans		4,053	4,122
Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
Loans		37,920	39,713
Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		37,895	39,686
Nonaccrual loans		1,087	1,086
PCI Loans Carrying Value [Member]
By LTV/CLTV:
PCI loans		10,709	12,835
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans		10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans		25	27
PCI Loans Carrying Value [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans		10,634	12,749
LTV 0-60% [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		151,737	150,203
LTV 0-60% [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		135,883	133,902
LTV 0-60% [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		15,854	16,301
LTV 60.01-80% [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		115,642	117,557
LTV 60.01-80% [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		103,368	104,639
LTV 60.01-80% [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		12,274	12,918
LTV 80.01-100% [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		20,476	20,504
LTV 80.01-100% [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		14,297	13,924
LTV 80.01-100% [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		6,179	6,580
LTV 100.01-120% [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		4,002	4,295
LTV 100.01-120% [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		1,757	1,868
LTV 100.01-120% [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		2,245	2,427
LTV greater than 120% [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		1,617	1,791
LTV greater than 120% [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		715	783
LTV greater than 120% [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		902	1,008
No LTV/CLTV available [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		1,675	1,525
No LTV/CLTV available [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		1,234	1,073
No LTV/CLTV available [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		441	452
Government Insured Or Guaranteed [Member] | Residential Mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		14,795	15,143
Government Insured Or Guaranteed [Member] | Real estate 1-4 family first mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		14,795	15,143
Government Insured Or Guaranteed [Member] | Real estate 1-4 family junior lien mortgage [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member]
By LTV/CLTV:
Loans		$ 0	$ 0
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi77

Loans and Allowance for Credit Losses, Nonaccrual (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	[1]	$ 947,308	$ 956,770
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		503,396	503,388
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		334,678	333,125
Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		125,543	126,599
Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		23,882	24,279
Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		19,293	19,385
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		443,912	453,382
Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		282,658	284,054
Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,920	39,713
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		49,554	53,371
Other revolving credit and installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,677	38,268
Residential Real Estate [Member]
Nonaccrual Loans [Abstract]
Mortgage Loans in Process of Foreclosure, Amount		5,900	6,300
Government Guaranteed Mortgage Loans upon Foreclosure Receivable [Member]
Nonaccrual Loans [Abstract]
Mortgage Loans in Process of Foreclosure, Amount		3,900	4,000
Mortgages held for sale [Member] | Real estate 1-4 family first mortgage [Member]
Nonaccrual Loans [Abstract]
Nonaccrual loans		137	136
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member]
Nonaccrual Loans [Abstract]
Nonaccrual loans		7,719	8,036
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		503,321	503,302
Nonaccrual Loans [Abstract]
Nonaccrual loans		2,409	2,640
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		334,603	333,039
Nonaccrual Loans [Abstract]
Nonaccrual loans		1,516	1,899
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		125,543	126,599
Nonaccrual Loans [Abstract]
Nonaccrual loans		755	628
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		23,882	24,279
Nonaccrual Loans [Abstract]
Nonaccrual loans		45	37
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		19,293	19,385
Nonaccrual Loans [Abstract]
Nonaccrual loans		93	76
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		433,278	440,633
Nonaccrual Loans [Abstract]
Nonaccrual loans		5,310	5,396
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		272,049	271,332
Nonaccrual Loans [Abstract]
Nonaccrual loans		4,053	4,122
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,895	39,686
Nonaccrual Loans [Abstract]
Nonaccrual loans		1,087	1,086
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		49,554	53,371
Nonaccrual Loans [Abstract]
Nonaccrual loans		117	130
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Other revolving credit and installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		37,677	38,268
Nonaccrual Loans [Abstract]
Nonaccrual loans		53	58
Criticized [Member] | Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		22,069	22,416
Criticized [Member] | Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		16,269	16,608
Criticized [Member] | Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		4,392	4,287
Criticized [Member] | Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		235	298
Criticized [Member] | Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Commercial Lease Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 1,173	$ 1,223
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Loans and Allowance for Credi78

Loans and Allowance for Credit Losses, 90 Days or More Past Due and Still Accruing (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Total Consumer [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	$ 903	$ 1,000
Financing Receivable Acquired With Deteriorated Credit Quality [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	1,000	1,400
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	10,753	11,997
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | FHA Insured/VA Guaranteed [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	9,786	10,934
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	967	1,063
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Total Commercial [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	64	49
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Commercial and Industrial Loans [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	40	26
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Commercial real estate mortgage [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	23	23
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Commercial Real Estate Construction [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	1	0
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Total Consumer [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	903	1,014
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Real estate 1-4 family first mortgage [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	164	219
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Real estate 1-4 family junior lien mortgage [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	48	60
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Credit Card [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	473	492
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Automobile [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	113	143
Loans Excluding Certain Loans Acquired In Transfer With Evidence Of Credit Deterioration [Member] | Total, not government insured/guaranteed [Member] | Other revolving credit and installment [Member]
Loans 90 days or more past due and still accruing:
90 days or more past due and still accruing	$ 105	$ 100

Loans and Allowance for Credi79

Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Impaired Loans [Abstract]
Unpaid principal balance	$ 21,467	$ 22,110
Impaired loans	18,144	18,674
Impaired loans with related allowance for credit losses	10,244	11,639
Related allowance for credit losses	1,694	1,890
Loans and Leases Receivable, Impaired, Commitment to Lend	559	579
Trial modifications [Member]
Impaired Loans [Abstract]
Impaired loans	198	194
Consumer Real Estate Loans Government Guaranteed Or Insured [Member]
Impaired Loans [Abstract]
Impaired loans	1,400	1,400
Total Commercial [Member]
Impaired Loans [Abstract]
Unpaid principal balance	5,018	5,306
Impaired loans	3,743	3,960
Impaired loans with related allowance for credit losses	3,457	3,651
Related allowance for credit losses	669	705
Commercial and Industrial Loans [Member]
Impaired Loans [Abstract]
Unpaid principal balance	3,182	3,577
Impaired loans	2,231	2,568
Impaired loans with related allowance for credit losses	1,978	2,310
Related allowance for credit losses	432	462
Commercial real estate mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	1,554	1,502
Impaired loans	1,307	1,239
Impaired loans with related allowance for credit losses	1,281	1,207
Related allowance for credit losses	196	211
Commercial Real Estate Construction [Member]
Impaired Loans [Abstract]
Unpaid principal balance	105	95
Impaired loans	61	54
Impaired loans with related allowance for credit losses	54	45
Related allowance for credit losses	8	9
Commercial Lease Financing Receivable [Member]
Impaired Loans [Abstract]
Unpaid principal balance	177	132
Impaired loans	144	99
Impaired loans with related allowance for credit losses	144	89
Related allowance for credit losses	33	23
Total Consumer [Member]
Impaired Loans [Abstract]
Unpaid principal balance	16,449	16,804
Impaired loans	14,401	14,714
Impaired loans with related allowance for credit losses	6,787	7,988
Related allowance for credit losses	1,025	1,185
Real estate 1-4 family first mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	13,692	14,020
Impaired loans	11,934	12,225
Impaired loans with related allowance for credit losses	4,888	6,060
Related allowance for credit losses	618	770
Real estate 1-4 family junior lien mortgage [Member]
Impaired Loans [Abstract]
Unpaid principal balance	2,072	2,135
Impaired loans	1,860	1,918
Impaired loans with related allowance for credit losses	1,352	1,421
Related allowance for credit losses	230	245
Credit Card [Member]
Impaired Loans [Abstract]
Unpaid principal balance	386	356
Impaired loans	386	356
Impaired loans with related allowance for credit losses	386	356
Related allowance for credit losses	139	136
Automobile [Member]
Impaired Loans [Abstract]
Unpaid principal balance	153	157
Impaired loans	83	87
Impaired loans with related allowance for credit losses	34	34
Related allowance for credit losses	5	5
Other revolving credit and installment [Member]
Impaired Loans [Abstract]
Unpaid principal balance	146	136
Impaired loans	138	128
Impaired loans with related allowance for credit losses	127	117
Related allowance for credit losses	$ 33	$ 29

Loans and Allowance for Credi80

Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	$ 18,385	$ 22,026
Recognized interest income	281	295
Interest income:
Cash basis of accounting	81	78
Other	200	217
Total Commercial [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	3,835	5,272
Recognized interest income	65	61
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	2,404	3,675
Recognized interest income	36	33
Commercial real estate mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,244	1,394
Recognized interest income	28	27
Commercial Real Estate Construction [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	58	84
Recognized interest income	1	1
Commercial Lease Financing Receivable [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	129	119
Recognized interest income	0	0
Total Consumer [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	14,550	16,754
Recognized interest income	216	234
Real estate 1-4 family first mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	12,073	14,132
Recognized interest income	172	190
Real estate 1-4 family junior lien mortgage [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	1,889	2,131
Recognized interest income	29	31
Credit Card [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	370	302
Recognized interest income	10	8
Automobile [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	85	83
Recognized interest income	3	3
Other revolving credit and installment [Member]
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment	133	106
Recognized interest income	$ 2	$ 2

Loans and Allowance for Credi81

Loans and Allowance for Credit Losses, Troubled Debt Restructurings Modifications by Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Net loans	$ 936,935		$ 945,766
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,179	$ 1,699
Financial effects of modifications
Charge-offs	$ 17	$ 87
Weighted average interest rate reduction	7.55%	5.27%
Commercial Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 643	$ 1,135
Financial effects of modifications
Charge-offs	$ 6	$ 65
Weighted average interest rate reduction	1.15%	0.95%
Commercial and Industrial Loans [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 497	$ 934
Financial effects of modifications
Charge-offs	$ 6	$ 65
Weighted average interest rate reduction	1.07%	0.82%
Commercial real estate mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 104	$ 195
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	1.24%	1.00%
Commercial Real Estate Construction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3	$ 3
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	0.00%	2.00%
Commercial Lease Financing Receivable [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 39	$ 3
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	0.00%	0.00%
Consumer Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 536	$ 564
Financial effects of modifications
Charge-offs	$ 11	$ 22
Weighted average interest rate reduction	8.20%	5.72%
Real estate 1-4 family first mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 362	$ 437
Financial effects of modifications
Charge-offs	$ 1	$ 9
Weighted average interest rate reduction	2.40%	2.60%
Real estate 1-4 family junior lien mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 37	$ 57
Financial effects of modifications
Charge-offs	$ 1	$ 6
Weighted average interest rate reduction	2.22%	2.95%
Credit Card [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 86	$ 57
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	11.32%	12.22%
Automobile [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 19	$ 16
Financial effects of modifications
Charge-offs	$ 9	$ 7
Weighted average interest rate reduction	6.48%	6.42%
Other revolving credit and installment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 17	$ 14
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	7.94%	7.29%
Trial modifications [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 15	$ (17)
Financial effects of modifications
Charge-offs	$ 0	$ 0
Weighted average interest rate reduction	0.00%	0.00%
Modification to principal [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 48	$ 88
Modification to principal [Member] | Commercial Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Commercial and Industrial Loans [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Commercial real estate mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Commercial Real Estate Construction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Commercial Lease Financing Receivable [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Consumer Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	48	88
Modification to principal [Member] | Real estate 1-4 family first mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	46	74
Modification to principal [Member] | Real estate 1-4 family junior lien mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	13
Modification to principal [Member] | Credit Card [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Automobile [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	1
Modification to principal [Member] | Other revolving credit and installment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification to principal [Member] | Trial modifications [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Contractual Interest Rate Reduction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	138	184
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	15	20
Contractual Interest Rate Reduction [Member] | Commercial and Industrial Loans [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	9	6
Contractual Interest Rate Reduction [Member] | Commercial real estate mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	6	14
Contractual Interest Rate Reduction [Member] | Commercial Real Estate Construction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Contractual Interest Rate Reduction [Member] | Commercial Lease Financing Receivable [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Contractual Interest Rate Reduction [Member] | Consumer Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	123	164
Contractual Interest Rate Reduction [Member] | Real estate 1-4 family first mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	10	72
Contractual Interest Rate Reduction [Member] | Real estate 1-4 family junior lien mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	8	21
Contractual Interest Rate Reduction [Member] | Credit Card [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	86	57
Contractual Interest Rate Reduction [Member] | Automobile [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	4	3
Contractual Interest Rate Reduction [Member] | Other revolving credit and installment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	15	11
Contractual Interest Rate Reduction [Member] | Trial modifications [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modifications, other concessions [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	993	1,427
Modifications, other concessions [Member] | Commercial Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	628	1,115
Modifications, other concessions [Member] | Commercial and Industrial Loans [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	488	928
Modifications, other concessions [Member] | Commercial real estate mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	98	181
Modifications, other concessions [Member] | Commercial Real Estate Construction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	3	3
Modifications, other concessions [Member] | Commercial Lease Financing Receivable [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	39	3
Modifications, other concessions [Member] | Consumer Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	365	312
Modifications, other concessions [Member] | Real estate 1-4 family first mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	306	291
Modifications, other concessions [Member] | Real estate 1-4 family junior lien mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	28	23
Modifications, other concessions [Member] | Credit Card [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modifications, other concessions [Member] | Automobile [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	14	12
Modifications, other concessions [Member] | Other revolving credit and installment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	2	3
Modifications, other concessions [Member] | Trial modifications [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	15	(17)
Modification of recorded investment related to interest rate reduction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	164	218
Modification of recorded investment related to interest rate reduction [Member] | Commercial Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	15	20
Modification of recorded investment related to interest rate reduction [Member] | Commercial and Industrial Loans [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	9	6
Modification of recorded investment related to interest rate reduction [Member] | Commercial real estate mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	6	14
Modification of recorded investment related to interest rate reduction [Member] | Commercial Real Estate Construction [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification of recorded investment related to interest rate reduction [Member] | Commercial Lease Financing Receivable [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Modification of recorded investment related to interest rate reduction [Member] | Consumer Portfolio Segment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	149	198
Modification of recorded investment related to interest rate reduction [Member] | Real estate 1-4 family first mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	35	103
Modification of recorded investment related to interest rate reduction [Member] | Real estate 1-4 family junior lien mortgage [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	9	24
Modification of recorded investment related to interest rate reduction [Member] | Credit Card [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	86	57
Modification of recorded investment related to interest rate reduction [Member] | Automobile [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	4	3
Modification of recorded investment related to interest rate reduction [Member] | Other revolving credit and installment [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	15	11
Modification of recorded investment related to interest rate reduction [Member] | Trial modifications [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Troubled Debt Restructuring Outstanding Balance [Member]
Financing Receivable, Modifications [Line Items]
Net loans	17,100		$ 17,800
Loans remodified [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	503	657
Principal Forgiveness [Member]
Primary modification type
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3	$ 9

Loans and Allowance for Credi82

Loans and Allowance for Credit Losses, Troubled Debt Restructurings, Current Defaults (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	$ 152	$ 131
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	112	83
Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	86	62
Commercial real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	26	21
Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	40	48
Real estate 1-4 family first mortgage [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	18	25
Real estate 1-4 family junior lien mortgage [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	5	4
Credit Card [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	13	15
Automobile [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	3	3
Other revolving credit and installment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment of defaults	$ 1	$ 1

Loans and Allowance for Credi83

Loans and Allowance for Credit Losses, PCI Loans Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
PCI Loans UPB [Member]
PCI loans [Abstract]
Total PCI loans (unpaid principal balance)	$ 15,447	$ 18,975	$ 98,200
PCI Loans UPB [Member] | Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	14,176	16,888
PCI Loans UPB [Member] | Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	151	157
PCI Loans Carrying Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	10,709	12,835
PCI Loans Carrying Value [Member] | Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	0	0
PCI Loans Carrying Value [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	75	86	18,700
PCI Loans Carrying Value [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	75	86
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	25	27
PCI Loans Carrying Value [Member] | Commercial real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	0	0
PCI Loans Carrying Value [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 10,634	$ 12,749	$ 40,100

Loans and Allowance for Credi84

Loans and Allowance for Credit Losses, PCI, Accretable Yield (Details) - USD ($) $ in Millions	3 Months Ended		108 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Significant Sales	$ 460	$ 349
Change in accretable yield related to PCI loans [Abstract]
Total, beginning of period	8,887		$ 10,447
Change in accretable yield due to acquisitions	0		161
Accretion into interest income	(314)		(16,983)
Accretion into noninterest income due to sales	(643)		(801)
Reclassification from nonaccretable difference for loans with improving credit-related cash flows	340		11,597
Changes in expected cash flows that do not affect nonaccretable difference	(1,406)		4,466
Total, end of period	6,864		$ 8,887
PCI Loans Carrying Value [Member] | Pick-A-Pay Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gain (Loss) on Sales, Net	643
Financing Receivable, Significant Sales	$ 1,600

Loans and Allowance for Credi85

Loans and Allowance for Credit Losses, PCI, by Credit Quality Indicator (Details) - Receivables Acquired with Deteriorated Credit Quality [Member] - Total Commercial [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 75	$ 86
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	6	8
Criticized [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 69	$ 78

Loans and Allowance for Credi86

Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Commercial (Details) - Receivables Acquired with Deteriorated Credit Quality [Member] - Total Commercial [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
By delinquency status:
Over 90 DPD and still accruing	$ 0	$ 0
PCI loans	75	86
Current-29 days past due (DPD) and still accruing [Member]
By delinquency status:
PCI loans	74	86
30-89 days past due and still accruing [Member]
By delinquency status:
PCI loans	$ 1	$ 0

Loans and Allowance for Credi87

Loans and Allowance for Credit Losses, PCI, by Delinquency Status, Consumer (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
PCI Loans UPB [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	$ 14,176	$ 16,888
PCI Loans UPB [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	151	157
PCI Loans UPB [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	14,327	17,045
PCI Loans Carrying Value [Member]
By delinquency status:
PCI loans	10,709	12,835
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	25	27
PCI Loans Carrying Value [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	10,634	12,749
Current-29 days past due (DPD) [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	11,310	13,127
Current-29 days past due (DPD) [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	136	138
Current-29 days past due (DPD) [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	11,446	13,265
Financing Receivables, 30 to 59 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	1,044	1,317
Financing Receivables, 30 to 59 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	6	8
Financing Receivables, 30 to 59 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	1,050	1,325
Financing Receivables, 60 to 89 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	496	622
Financing Receivables, 60 to 89 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	2	3
Financing Receivables, 60 to 89 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	498	625
90-119 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	221	293
90-119 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	2	2
90-119 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	223	295
120-179 DPD member [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	158	219
120-179 DPD member [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	1	2
120-179 DPD member [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	159	221
180 plus DPD [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
PCI loans	947	1,310
180 plus DPD [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
PCI loans	4	4
180 plus DPD [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By delinquency status:
PCI loans	$ 951	$ 1,314

Loans and Allowance for Credi88

Loans and Allowance for Credit Losses, PCI, by FICO Score, Consumer (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
PCI Loans UPB [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	$ 14,176	$ 16,888
PCI Loans UPB [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	151	157
PCI Loans UPB [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	14,327	17,045
PCI Loans Carrying Value [Member]
By FICO:
PCI loans	10,709	12,835
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	25	27
PCI Loans Carrying Value [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	10,634	12,749
FICO less than 600 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	3,307	4,014
FICO less than 600 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	33	37
FICO less than 600 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	3,340	4,051
FICO 600-639 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	1,794	2,086
FICO 600-639 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	21	20
FICO 600-639 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	1,815	2,106
FICO 640-679 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	2,020	2,393
FICO 640-679 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	24	24
FICO 640-679 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	2,044	2,417
FICO 680-719 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	1,867	2,242
FICO 680-719 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	28	29
FICO 680-719 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	1,895	2,271
FICO 720-759 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	1,475	1,779
FICO 720-759 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	22	23
FICO 720-759 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	1,497	1,802
FICO 760-799 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	799	933
FICO 760-799 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	11	12
FICO 760-799 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	810	945
FICO 800 or more [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	456	468
FICO 800 or more [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	7	6
FICO 800 or more [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	463	474
No FICO available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By FICO:
PCI loans	2,458	2,973
No FICO available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By FICO:
PCI loans	5	6
No FICO available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By FICO:
PCI loans	$ 2,463	$ 2,979

Loans and Allowance for Credi89

Loans and Allowance for Credit Losses, PCI, by Loan to Value Ratio, Consumer (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
PCI Loans UPB [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	$ 14,176	$ 16,888
PCI Loans UPB [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	151	157
PCI Loans UPB [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	14,327	17,045
PCI Loans Carrying Value [Member]
By LTV/CLTV:
PCI loans	10,709	12,835
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	10,609	12,722
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	25	27
PCI Loans Carrying Value [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	10,634	12,749
LTV 0-60% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	7,095	8,010
LTV 0-60% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	46	45
LTV 0-60% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	7,141	8,055
LTV 60.01-80% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	5,224	6,510
LTV 60.01-80% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	61	63
LTV 60.01-80% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	5,285	6,573
LTV 80.01-100% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	1,540	1,975
LTV 80.01-100% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	31	35
LTV 80.01-100% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	1,571	2,010
LTV 100.01-120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	260	319
LTV 100.01-120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	9	10
LTV 100.01-120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	269	329
LTV greater than 120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	56	73
LTV greater than 120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	3	3
LTV greater than 120% [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	59	76
No LTV/CLTV available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
PCI loans	1	1
No LTV/CLTV available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
PCI loans	1	1
No LTV/CLTV available [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
By LTV/CLTV:
PCI loans	$ 2	$ 2

Equity Securities (Details)

Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity Securities [Line Items]
Trading equity securities	$ 25,327		$ 30,004
Fair Value of Net Asset (Liability) From Economic Hedges Related To Deferred Compensation Planned Obligation Activities	3,500		3,700
Equity Securities	58,935		62,497
Income (Loss) from Affordable Housing Projects, Equity Method Investments	(280)	$ (230)
Affordable Housing Tax Credits and Other Tax Benefits, Amount	359	347
Affordable Housing Tax Credits, Amount	290	$ 261
Qualified Affordable Housing Project Investments, Commitment	$ 3,500		3,600
Affordable Housing Tax Credits Commitment, Payment Period	3 years
Nonmarketable Equity Securities
Equity Securities [Line Items]
Equity Securities with Fair Value Option Election	$ 5,000		4,900
Investment in Federal Home Loan Bank Stock
Equity Securities [Line Items]
Other Equity Investments	5,700		5,400
Not Held for Trading [Member]
Equity Securities [Line Items]
Equity Securities at Fair Value	10,234		9,223
Equity Method Investments	16,248		16,352
Equity Securities Not Held for Trading	33,608		32,493
Not Held for Trading [Member] | Nonmarketable Equity Securities
Equity Securities [Line Items]
Equity Securities at Fair Value	5,303		4,867
Not Held for Trading [Member] | Low Income Housing Tax Credit Equity Method Investments
Equity Securities [Line Items]
Equity Method Investments	10,318		10,269
Not Held for Trading [Member] | Private Equity Funds [Member]
Equity Securities [Line Items]
Equity Method Investments	3,840		3,839
Other Equity Investments	1,346		1,090
Not Held for Trading [Member] | Tax Advantaged Renewable Energy
Equity Securities [Line Items]
Equity Method Investments	1,822		1,950
Not Held for Trading [Member] | New Market Tax Credit and Other
Equity Securities [Line Items]
Equity Method Investments	268		294
Not Held for Trading [Member] | Marketable Equity Securities
Equity Securities [Line Items]
Equity Securities at Fair Value	4,931		4,356
Held for Trading [Member] | Marketable Equity Securities
Equity Securities [Line Items]
Trading equity securities	25,327		30,004
Other investments | Not Held for Trading [Member] | Investment in Federal Home Loan Bank Stock
Equity Securities [Line Items]
Other Equity Investments	$ 5,780		$ 5,828

Net Gains (Losses) from Equity

Net Gains (Losses) from Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Economic Hedge Derivatives	$ (58)	$ (474)
Equity Securities at Fair Value
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	117	765
Equity Securities
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	783	570
Equity Method Investments
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	724	279
Marketable Equity Securities | Equity Securities at Fair Value
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	8	283
Nonmarketable Equity Securities | Equity Securities at Fair Value
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	109	482
Measurement Alternative
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	296
Other | Equity Method Investments
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	18	29
Realized Gains on Sale | Equity Method Investments
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	498	326
Measurement Alternative Observable Transactions | Equity Method Investments
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	228	0
Impairment in Value of Asset | Equity Method Investments
Net Gains (Losses) from Equity Securities [Line Items]
Gain (Loss) on Investments	$ (20)	$ (76)

Measurement Alternative (Detail

Measurement Alternative (Details) - Measurement Alternative $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Measurement Alternative [Line Items]
Cumulative gross unrealized losses due to observable price changes	$ 0
Cumulative gross unrealized gains due to observable price changes	228
Gain (Loss) on Sale of Investments	75
Gain (Loss) on Investments	296
Gross unrealized losses due to observable price changes	0
Other than Temporary Impairment Losses, Investments	(7)
Gross unrealized gains due to observable price changes	$ 228

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Components of Other Assets [Line Items]
Corporate/bank-owned life insurance	$ 19,589	$ 19,549
Accounts receivable (1)	37,322	39,127
Interest receivable	5,824	5,688
Net carrying value	2,754	3,034
Non-residential real estate	229	270
Operating lease assets	9,382	9,666
Due from customers on acceptances	196	177
Other	11,661	13,785
Other assets	85,888	90,244	[1]
Government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate	103	120
Non-government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate	239	252
Core deposit intangibles [Member]
Components of Other Assets [Line Items]
Net carrying value	577	769
Customer relationship and other amortized intangibles [Member]
Components of Other Assets [Line Items]
Net carrying value	$ 766	$ 841
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Securitizations and Variable 94

Securitizations and Variable Interest Entities, Balance Sheet Transactions with VIEs (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		$ 18,145	$ 23,367
Interest-earning deposits with banks (1)		184,250	192,580	[1]
Federal funds sold and securities purchased under resale agreements (1)		73,550	80,025	[1]
Debt securities:
Trading debt securities		59,866	57,624	[2]
Available-for-sale debt securities		271,656	276,407	[2]
Held-to-maturity, at cost (fair value $138,323 and $138,985)		141,446	139,335
Mortgages held for sale	[3]	17,944	20,070
Loans	[3]	947,308	956,770
Mortgage servicing rights		15,041	13,625
Derivative assets		11,467	12,228
Equity investments		58,935	62,497	[2]
Other assets		85,888	90,244	[2]
Total assets	[4]	1,915,388	1,951,757
Short-term borrowings		97,207	103,256
Derivative liabilities		7,883	8,796
Accrued expenses and other liabilities		73,397	70,615
Long-term debt		227,302	225,020
Total liabilities	[5]	1,709,478	1,743,678
Noncontrolling interests		958	1,143
VIEs that we consolidate recourse [member]
Debt securities:
Total liabilities		0	0
VIEs that we do not consolidate [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		0	0
Interest-earning deposits with banks (1)		0	0
Debt securities:
Trading debt securities		2,011	1,305
Available-for-sale debt securities		3,405	3,288
Held-to-maturity, at cost (fair value $138,323 and $138,985)		502	485
Loans		2,766	4,274
Mortgage servicing rights		14,977	13,628
Derivative assets		124	44
Equity investments		10,683	10,740
Other assets		0	0
Total assets		34,468	33,764
Short-term borrowings		0	0
Derivative liabilities		45	106
Accrued expenses and other liabilities		245	244
Long-term debt		3,507	3,590
Total liabilities		3,797	3,940
Noncontrolling interests		0	0
Net assets		30,671	29,824
VIEs that we consolidate [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		111	116
Interest-earning deposits with banks (1)		8	371
Debt securities:
Trading debt securities		0	0
Available-for-sale debt securities		0	0
Held-to-maturity, at cost (fair value $138,323 and $138,985)		0	0
Loans		13,007	12,482
Mortgage servicing rights		0	0
Derivative assets		0	0
Equity investments		28	306
Other assets		230	342
Total assets		13,384	13,617
Short-term borrowings		0	0
Derivative liabilities		4	5
Accrued expenses and other liabilities		127	132
Long-term debt		947	1,479
Total liabilities		1,078	1,616
Noncontrolling interests		31	283
Net assets		12,275	11,718
Transfers that we account for as secured borrowings [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		0	0
Interest-earning deposits with banks (1)		0	0
Debt securities:
Trading debt securities		200	201
Available-for-sale debt securities		343	358
Held-to-maturity, at cost (fair value $138,323 and $138,985)		0	0
Loans		106	110
Mortgage servicing rights		0	0
Derivative assets		0	0
Equity investments		0	0
Other assets		7	6
Total assets		656	675
Short-term borrowings		512	522
Derivative liabilities		0	0
Accrued expenses and other liabilities		10	10
Long-term debt		107	111
Total liabilities		629	643
Noncontrolling interests		0	0
Net assets		27	32
Total VIE [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		111	116
Interest-earning deposits with banks (1)		8	371
Debt securities:
Trading debt securities		2,211	1,506
Available-for-sale debt securities		3,748	3,646
Held-to-maturity, at cost (fair value $138,323 and $138,985)		502	485
Loans		15,879	16,866
Mortgage servicing rights		14,977	13,628
Derivative assets		124	44
Equity investments		10,711	11,046
Other assets		237	348
Total assets		48,508	48,056
Short-term borrowings		512	522
Derivative liabilities		49	111
Accrued expenses and other liabilities		382	386
Long-term debt		4,561	5,180
Total liabilities		5,504	6,199
Noncontrolling interests		31	283
Net assets		$ 42,973	$ 41,574
[1]	(1)Financial information has been revised to reflect the impact of the adoption of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[3]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.
[4]	(4)Our consolidated assets at March 31, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $111 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $13.0 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $28 million and $306 million; Other assets, $230 million and $342 million; and Total assets, $13.4 billion and $13.6 billion, respectively.
[5]	(5)Our consolidated liabilities at March 31, 2018, and December 31, 2017, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Derivative liabilities, $4 million and $5 million; Accrued expenses and other liabilities, $127 million and $132 million; Long-term debt, $947 million and $1.5 billion; and Total liabilities, $1.1 billion and $1.6 billion, respectively.

Securitizations and Variable 95

Securitizations and Variable Interest Entities, Unconsolidated VIEs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Variable Interest Entity [Line Items]
Total VIE assets	$ 1,369,255		$ 1,367,437
Securitizations and Variable Interest Entities Textual [Abstract]
Percentage of underlying collateral rated as investment grade			100.00%
Carrying value of delinquent loans eligible for repurchase	1,200		$ 2,200
Principal amount that would be payable to securitization vehicles	1,200		2,200
Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Total VIE assets	1,171,619		1,169,410
Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Total VIE assets	13,057		14,175
Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Total VIE assets	146,886		144,650
Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Total VIE assets	1,010		1,031
Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Total VIE assets	0		1,481
Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Total VIE assets	2,192		2,333
Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Total VIE assets	32,270		31,852
Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Total VIE assets	7		23
Investment Funds [Member]
Variable Interest Entity [Line Items]
Total VIE assets	212		225
Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Total VIE assets	2,002		2,257
VIEs that we do not consolidate [Member] | Waived fees [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Financial support provided to a nonconsolidated legal entity	13	$ 14
Debt and equity interests [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	19,367		20,092
Maximum exposure to loss	19,367		20,092
Debt and equity interests [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	2,851		2,100
Maximum exposure to loss	2,851		2,100
Debt and equity interests [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	552		598
Maximum exposure to loss	552		598
Debt and equity interests [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	2,350		2,198
Maximum exposure to loss	2,350		2,198
Debt and equity interests [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Debt and equity interests [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		1,443
Maximum exposure to loss	0		1,443
Debt and equity interests [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	1,749		1,867
Maximum exposure to loss	1,749		1,867
Debt and equity interests [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	11,345		11,258
Maximum exposure to loss	11,345		11,258
Debt and equity interests [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		1
Maximum exposure to loss	0		1
Debt and equity interests [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	51		50
Maximum exposure to loss	51		50
Debt and equity interests [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	469		577
Maximum exposure to loss	469		577
Servicing assets [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	14,977		13,628
Maximum exposure to loss	14,977		13,628
Servicing assets [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	14,044		12,665
Maximum exposure to loss	14,044		12,665
Servicing assets [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	68		73
Maximum exposure to loss	68		73
Servicing assets [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	865		890
Maximum exposure to loss	865		890
Servicing assets [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Servicing assets [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	79		(62)
Maximum exposure to loss	184		167
Derivative [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(43)		28
Maximum exposure to loss	45		42
Derivative [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	5		5
Maximum exposure to loss	5		5
Derivative [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Derivative [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	117		(95)
Maximum exposure to loss	134		120
Other commitments and guarantees [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(3,752)		(3,834)
Maximum exposure to loss	13,075		12,762
Other commitments and guarantees [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(190)		(190)
Maximum exposure to loss	1,257		1,137
Other commitments and guarantees [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Other commitments and guarantees [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(35)		(34)
Maximum exposure to loss	10,328		10,202
Other commitments and guarantees [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(20)		(20)
Maximum exposure to loss	20		20
Other commitments and guarantees [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Other commitments and guarantees [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	71		71
Other commitments and guarantees [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(3,507)		(3,590)
Maximum exposure to loss	1,242		1,175
Other commitments and guarantees [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Other commitments and guarantees [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	0		0
Other commitments and guarantees [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		0
Maximum exposure to loss	157		157
Total exposure [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	47,603		46,649
Total exposure [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	18,152		15,902
Total exposure [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	620		671
Total exposure [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	13,588		13,332
Total exposure [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	25		25
Total exposure [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0		1,443
Total exposure [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	1,820		1,938
Total exposure [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	12,587		12,433
Total exposure [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0		1
Total exposure [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	51		50
Total exposure [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	760		854
Net assets [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	30,671		29,824
Net assets [Member] | Conforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	16,705		14,575
Net assets [Member] | Other/Nonconforming Residential Mortgage Loan Securitization [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	620		671
Net assets [Member] | Commercial Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	3,137		3,082
Net assets [Member] | Collateralized Debt Obligations Debt Securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(15)		(15)
Net assets [Member] | Collateralized Debt Obligations Loans [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		1,443
Net assets [Member] | Asset-based finance structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	1,749		1,867
Net assets [Member] | Tax Credit Structures [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	7,838		7,668
Net assets [Member] | Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	0		1
Net assets [Member] | Investment Funds [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	51		50
Net assets [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	586		482
Equity Interests [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	10,700		10,700
Other investments
Securitizations and Variable Interest Entities Textual [Abstract]
Securities available for sale portfolio of ARS issued by VIEs	292		400
Trust preferred securities [Member]
Variable Interest Entity [Line Items]
Carrying value asset (liability)	(2,000)		(2,000)
Trust preferred securities [Member] | Preferred Stock [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Carrying value - equity	$ 2,500		$ 2,500

Securitizations and Variable 96

Securitizations and Variable Interest Entities, Cash Flows From Sales and Securitization Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Securitizations and Variable Interest Entities Textual [Abstract]
Amount paid to repurchase loans from securitization vehicles	$ 2,900	$ 2,300
Net gain from sale of assets securitizations	700	132
Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount transferred related to mortgages to unconsolidated VIE	47,300	55,500
Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	50,587	58,257
Fees from servicing rights retained	845	854
Cash flows from other interests held	185	834
Servicing advances, net of repayments	(36)	(142)
Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Proceeds from securitizations and whole loan sales	0	21
Fees from servicing rights retained	0	0
Cash flows from other interests held	0	0
Servicing advances, net of repayments	0	0
Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Net gain from sale of assets securitizations	69	96
Amount transferred related to mortgages to unconsolidated VIE	3,100	3,300
Non-agency securitizations and whole loan transactions [Member] | Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	1	2
Non-agency securitizations and whole loan transactions [Member] | Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	0	0
Agency securitizations | Mortgage loans [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	33	23
Agency securitizations | Other financial assets [Member]
Cash Flow Securitizations [Abstract]
Repurchases of assets/loss reimbursements	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value	533	546
Amount of liability for repurchase reserves at fair value	3	8
Fair Value, Inputs, Level 3 [Member] | Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Amount of servicing asset at fair value	34	45
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value	3,800	2,800
Fair Value, Inputs, Level 2 [Member] | Commercial Loan [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities, at fair value	$ 0	$ 0

Securitizations and Variable 97

Securitizations and Variable Interest Entities, Residential Mortgage Servicing Rights (Details) - Residential mortgage servicing rights [Member] - $ / loan	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Prepayment speed	9.60%	10.30%
Discount rate	7.30%	6.80%
Cost to service ($ per loan)	117	134

Securitizations and Variable 98

Securitizations and Variable Interest Entities, Retained Interests from Unconsolidated VIEs (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)$ / loan	Dec. 31, 2017USD ($)$ / loan
Residential mortgage servicing rights [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of interests held	$ 15,041	$ 13,625
Expected weighted-average life (in years)	6 years 9 months	6 years 2 months 12 days
Key economic assumptions:
Prepayment speed assumption	9.30%	10.50%
Decrease in fair value from:
10% adverse change	$ 546	$ 565
25% adverse change	$ 1,298	$ 1,337
Discount rate assumption	7.20%	6.90%
Decrease in fair value from:
100 basis point increase	$ 729	$ 652
200 basis point increase	$ 1,394	$ 1,246
Cost to service assumption ($ per loan) | $ / loan	136	143
Decrease in fair value from:
10% adverse change	$ 451	$ 467
25% adverse change	1,127	1,169
Interest-Only Strips [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of interests held	$ 18	$ 19
Expected weighted-average life (in years)	3 years 7 months 2 days	3 years 3 months 18 days
Key economic assumptions:
Prepayment speed assumption	18.30%	20.00%
Decrease in fair value from:
10% adverse change	$ 1	$ 1
25% adverse change	$ 2	$ 2
Discount rate assumption	15.40%	14.80%
Decrease in fair value from:
100 basis point increase	$ 0	$ 0
200 basis point increase	1	1
Subordinated bonds [Member] | Commercial securitizations [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of interests held	$ 611	$ 596
Expected weighted-average life (in years)	6 years 4 months 24 days	6 years 8 months 12 days
Decrease in fair value from:
Discount rate assumption	3.80%	4.10%
Decrease in fair value from:
100 basis point increase	$ 42	$ 32
200 basis point increase	$ 71	$ 61
Decrease in fair value from:
Credit loss assumption	8.00%	1.80%
Decrease in fair value from:
10% higher losses	$ 13	$ 0
25% higher losses	17	0
Senior bonds [Member] | Commercial securitizations [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of interests held	$ 443	$ 468
Expected weighted-average life (in years)	5 years 10 days	5 years 2 months 12 days
Decrease in fair value from:
Discount rate assumption	3.50%	3.10%
Decrease in fair value from:
100 basis point increase	$ 18	$ 20
200 basis point increase	$ 36	$ 39
Decrease in fair value from:
Credit loss assumption	0.00%	0.00%
Decrease in fair value from:
10% higher losses	$ 0	$ 0
25% higher losses	0	0
Commercial mortgage servicing [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of interests held	$ 2,300	$ 2,000
Securitizations and Variable Interest Entities Textual [Abstract]
Percentage of adverse change in interest rate	25.00%	25.00%
Decrease in fair value from 25% adverse change in interest rate	$ 325	$ 278
VIEs that we do not consolidate [Member] | Loans [Member]
Decrease in fair value from:
200 basis point increase	19	25
Securitizations and Variable Interest Entities Textual [Abstract]
Loans receivable	$ 1,200	$ 1,300

Securitizations and Variable 99

Securitizations and Variable Interest Entities, Off-Balance Sheet Loans Sold or Securitized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	$ 1,223,794		$ 1,227,083
Delinquent loans and foreclosed assets	14,445		16,232
Net charge-offs	126	$ 495
FNMA, FHLMC and GNMA [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,100,000		1,100,000
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	628		619
Delinquent loans	7,900		9,100
Total Commercial [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	101,784		100,875
Delinquent loans and foreclosed assets	2,622		2,839
Net charge-offs	10	295
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	1,200		1,200
Commercial real estate mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	101,784		100,875
Delinquent loans and foreclosed assets	2,622		2,839
Net charge-offs	10	295
Total Consumer [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,122,010		1,126,208
Delinquent loans and foreclosed assets	11,823		13,393
Net charge-offs	116	200
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	892		879
Real estate 1-4 family first mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,122,010		1,126,208
Delinquent loans and foreclosed assets	11,823		$ 13,393
Net charge-offs	$ 116	$ 200

Securitizations and Variable100

Securitizations and Variable Interest Entities, Transactions with Consolidated VIEs and Secured Borrowings (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets	[1]	$ 1,915,388	$ 1,951,757
Liabilities	[2]	(1,709,478)	(1,743,678)
Noncontrolling interests		(958)	(1,143)
Total secured borrowings [Member]
Variable Interest Entity [Line Items]
Total VIE assets		756	771
Total secured borrowings [Member] | Municipal tender option bond securitizations [Member]
Variable Interest Entity [Line Items]
Total VIE assets		647	658
Total secured borrowings [Member] | Residential mortgage securitizations [Member]
Variable Interest Entity [Line Items]
Total VIE assets		109	113
Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Total VIE assets		13,733	14,424
Assets		13,384	13,617
Liabilities		(1,078)	(1,616)
Noncontrolling interests		(31)	(283)
Net assets		12,275	11,718
Consolidated VIEs [Member] | Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Total VIE assets		2,594	2,378
Consolidated VIEs [Member] | Commercial and Industrial Loans and Leases [Member]
Variable Interest Entity [Line Items]
Total VIE assets		8,652	9,116
Consolidated VIEs [Member] | Nonconforming residential mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Total VIE assets		2,386	2,515
Consolidated VIEs [Member] | Structured asset finance [Member]
Variable Interest Entity [Line Items]
Total VIE assets		7	10
Consolidated VIEs [Member] | Investment funds [Member]
Variable Interest Entity [Line Items]
Total VIE assets		24	305
Consolidated VIEs [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Total VIE assets		70	100
Total secured borrowings and consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Total VIE assets		14,489	15,195
Carrying value [Member] | Total secured borrowings [Member]
Variable Interest Entity [Line Items]
Assets		656	675
Liabilities		(629)	(643)
Noncontrolling interests		0	0
Net assets		27	32
Carrying value [Member] | Total secured borrowings [Member] | Municipal tender option bond securitizations [Member]
Variable Interest Entity [Line Items]
Assets		550	565
Liabilities		(522)	(532)
Noncontrolling interests		0	0
Net assets		28	33
Carrying value [Member] | Total secured borrowings [Member] | Residential mortgage securitizations [Member]
Variable Interest Entity [Line Items]
Assets		106	110
Liabilities		(107)	(111)
Noncontrolling interests		0	0
Net assets		(1)	(1)
Carrying value [Member] | Consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Assets		13,384	13,617
Liabilities		(1,078)	(1,616)
Noncontrolling interests		(31)	(283)
Net assets		12,275	11,718
Carrying value [Member] | Consolidated VIEs [Member] | Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Assets		2,594	2,378
Liabilities		0	0
Noncontrolling interests		0	0
Net assets		2,594	2,378
Carrying value [Member] | Consolidated VIEs [Member] | Commercial and Industrial Loans and Leases [Member]
Variable Interest Entity [Line Items]
Assets		8,607	8,626
Liabilities		(420)	(915)
Noncontrolling interests		(10)	(29)
Net assets		8,177	7,682
Carrying value [Member] | Consolidated VIEs [Member] | Nonconforming residential mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Assets		2,092	2,212
Liabilities		(653)	(694)
Noncontrolling interests		0	0
Net assets		1,439	1,518
Carrying value [Member] | Consolidated VIEs [Member] | Structured asset finance [Member]
Variable Interest Entity [Line Items]
Assets		5	6
Liabilities		(4)	(4)
Noncontrolling interests		0	0
Net assets		1	2
Carrying value [Member] | Consolidated VIEs [Member] | Investment funds [Member]
Variable Interest Entity [Line Items]
Assets		24	305
Liabilities		0	(2)
Noncontrolling interests		0	(230)
Net assets		24	73
Carrying value [Member] | Consolidated VIEs [Member] | Other securitizations and transactions [Member]
Variable Interest Entity [Line Items]
Assets		62	90
Liabilities		(1)	(1)
Noncontrolling interests		(21)	(24)
Net assets		40	65
Carrying value [Member] | Total secured borrowings and consolidated VIEs [Member]
Variable Interest Entity [Line Items]
Assets		14,040	14,292
Liabilities		(1,707)	(2,259)
Noncontrolling interests		(31)	(283)
Net assets		$ 12,302	$ 11,750
[1]	(4)Our consolidated assets at March 31, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $111 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $13.0 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $28 million and $306 million; Other assets, $230 million and $342 million; and Total assets, $13.4 billion and $13.6 billion, respectively.
[2]	(5)Our consolidated liabilities at March 31, 2018, and December 31, 2017, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Derivative liabilities, $4 million and $5 million; Accrued expenses and other liabilities, $127 million and $132 million; Long-term debt, $947 million and $1.5 billion; and Total liabilities, $1.1 billion and $1.6 billion, respectively.

Mortgage Banking Activities, An

Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in MSRs measured at fair value
Fair value, beginning of period	$ 13,625
Changes in fair value:
Net changes in valuation model inputs or assumptions	1,330	$ 174
Changes due to collection/realization of expected cash flows over time	(483)	(461)
Total changes in fair value	847	(287)
Fair value, end of period	15,041
Carried at fair value [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	13,625	12,959
Servicing from securitizations or asset transfers (1)	573	583
Sales and other (2)	(4)	(47)
Net additions	569	536
Changes in fair value:
Net changes in valuation model inputs or assumptions	1,330	174
Changes due to collection/realization of expected cash flows over time	(483)	(461)
Total changes in fair value	847	(287)
Fair value, end of period	15,041	13,208
Carried at fair value [Member] | Mortgage interest rates [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	1,253	152
Carried at fair value [Member] | Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	34	27
Carried at fair value [Member] | Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	$ 43	$ (5)

Mortgage Banking Activities,102

Mortgage Banking Activities, Analysis of Changes in Amortized MSRs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in amortized MSRs
Amortization	$ (65)	$ (67)
Amortized [Member]
Changes in amortized MSRs
Balance, beginning of period	1,424	1,406
Purchases	18	18
Servicing from securitizations or asset transfers	34	45
Amortization	(65)	(67)
Balance, end of period	1,411	1,402
Fair value of amortized MSRs:
Beginning of period	2,025	1,956
End of period	2,307	2,051
Commercial mortgage servicing [Member] | Amortized [Member]
Mortgage Banking Activities (Textual) [Abstract]
Valuation allowance	$ 0	$ 0

Mortgage Banking Activities, Ma

Mortgage Banking Activities, Managed Servicing Portfolio (Details) - USD ($) $ in Billions	Mar. 31, 2018	Dec. 31, 2017
Components of Managed Servicing Portfolio [Abstract]
Serviced for others	$ 1,711	$ 1,704
Total managed servicing portfolio	$ 2,188	$ 2,185
Ratio of MSRs to related loans serviced for others	0.96%	0.88%
Residential mortgage servicing rights [Member]
Components of Managed Servicing Portfolio [Abstract]
Serviced for others	$ 1,201	$ 1,209
Owned loans serviced	337	342
Subserviced for others	5	3
Total managed servicing portfolio	1,543	1,554
Commercial mortgage servicing [Member]
Components of Managed Servicing Portfolio [Abstract]
Serviced for others	510	495
Owned loans serviced	125	127
Subserviced for others	10	9
Total managed servicing portfolio	$ 645	$ 631

Mortgage Banking Activities, Mo

Mortgage Banking Activities, Mortgage Banking Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Servicing fees:
Contractually specified servicing fees	$ 916	$ 907
Late charges	44	48
Ancillary fees	40	50
Unreimbursed direct servicing costs	(94)	(123)
Net servicing fees	906	882
Changes in fair value of MSRs carried at fair value:
Due to changes in valuation model inputs or assumptions	1,330	174
Changes due to collection/realization of expected cash flows over time	(483)	(461)
Total changes in fair value of MSRs carried at fair value	847	(287)
Amortization	(65)	(67)
Net Derivative Gains (Losses) From Economic Hedges Related To Mortgage Servicing Activities	(1,220)	(72)
Total servicing income, net	468	456
Net gains on mortgage loan origination/sales activities	466	772
Total mortgage banking noninterest income	934	1,228
Market-related valuation changes to MSRs, net of hedge results	$ 110	$ 102

Mortgage Banking Activities,105

Mortgage Banking Activities, Analysis of Changes in Liability for Mortgage Loan Repurchase Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Liability For Mortgage Loan Repurchase Losses [Abstract]
Balance, beginning of period	$ 181	$ 229
Provision for repurchase losses:
Loan sales	3	8
Change in estimate	1	(8)
Net additions to provision	4	0
Losses	(4)	(7)
Balance, end of period	181	$ 222
Liability For Mortgage Loans Repurchase Losses [Member]
Mortgage Banking Activities (Textual) [Abstract]
Range of possible loss, portion not accrued	$ 166

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Amortized intangible assets:
Gross carrying value	$ 20,756	$ 20,704
Accumulated amortization	(18,002)	(17,670)
Net carrying value	2,754	3,034
Unamortized intangible assets:
Mortgage servicing rights	15,041	13,625
Goodwill	26,445	26,587	$ 26,666	$ 26,693
Trademark	14	14
MSRs [Member]
Amortized intangible assets:
Gross carrying value	3,928	3,876
Accumulated amortization	(2,517)	(2,452)
Net carrying value	1,411	1,424
Core deposit intangibles [Member]
Amortized intangible assets:
Gross carrying value	12,834	12,834
Accumulated amortization	(12,257)	(12,065)
Net carrying value	577	769
Customer relationship and other intangibles [Member]
Amortized intangible assets:
Gross carrying value	3,994	3,994
Accumulated amortization	(3,228)	(3,153)
Net carrying value	$ 766	$ 841

Intangible Assets, Amortization

Intangible Assets, Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	$ 265	$ 289
Estimate for the remainder of 2018	1,002
Estimate for year ended December 31,
2,019	345
2,020	296
2,021	254
2,022	223
2,023	187
Finite lived intangible assets [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	332
Amortized MSRs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	65
Estimate for the remainder of 2018	202
Estimate for year ended December 31,
2,019	229
2,020	199
2,021	172
2,022	155
2,023	128
Core deposit intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	192
Estimate for the remainder of 2018	577
Estimate for year ended December 31,
2,019	0
2,020	0
2,021	0
2,022	0
2,023	0
Customer relationship and other amortized intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	75
Estimate for the remainder of 2018	223
Estimate for year ended December 31,
2,019	116
2,020	97
2,021	82
2,022	68
2,023	59
Lease agreement intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Three months ended March 31, 2018 (actual)	$ 2

Intangible Assets, Allocation o

Intangible Assets, Allocation of Goodwill to Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 26,587	$ 26,693
Reduction in goodwill related to divested business and other	(142)	(27)
Goodwill, Ending Balance	26,445	26,666
Community Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	16,849	16,849
Reduction in goodwill related to divested business and other	(142)	0
Goodwill, Ending Balance	16,707	16,849
Wholesale Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	8,455	8,585
Reduction in goodwill related to divested business and other	0	(27)
Goodwill, Ending Balance	8,455	8,558
Wealth and Investment Management [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,283	1,259
Reduction in goodwill related to divested business and other	0	0
Goodwill, Ending Balance	$ 1,283	$ 1,259

Guarantees, Pledged Assets a109

Guarantees, Pledged Assets and Collateral (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		$ (137)		$ (364)
Maximum exposure to loss, expires in one year or less		30,961		31,034
Maximum exposure to loss, expires in one year through three years		21,260		21,147
Maximum exposure to loss, expires in three years through five years		7,815		7,896
Maximum exposure to loss, expires after five years		15,509		16,052
Maximum exposure to loss		75,545		76,129
Total assets	[1]	1,915,388		1,951,757
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value		4,700		5,200
Mortgages held for sale		1,000		2,600
Carrying value of delinquent loans eligible for repurchase		1,200		2,200
Security Owned and Pledged as Collateral, Fair Value [Abstract]
Equity Securities,Trading		25,327		30,004
Total pledged assets held for trading		97,420		100,362
Total pledged assets		612,748		652,300
Not Held for Trading [Member]
Security Owned and Pledged as Collateral, Fair Value [Abstract]
Debt securities and other, not held for trading		66,739		73,592
Mortgages held for sale and loans		450,605		469,554
Total pledged assets		517,344		543,146
Collateral Pledged [Member]
Security Owned and Pledged as Collateral, Fair Value [Abstract]
Debt Securities, Trading		83,742		96,993
Equity Securities,Trading		11,662		12,161
Total pledged assets held for trading		95,404		109,154
Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		37,973		36,692
Written put options [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		(227)		(455)
Maximum exposure to loss, expires in one year or less		15,044		14,758
Maximum exposure to loss, expires in one year through three years		12,739		12,706
Maximum exposure to loss, expires in three years through five years		3,748		3,890
Maximum exposure to loss, expires after five years		891		1,038
Maximum exposure to loss		32,422		32,392
Written put options [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		20,462		19,087
Direct pay letters of credit (DPLCs) [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		7,700		8,100
Third Party Clearing Indemnifications [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		1,000		809
Third-party Clearing Customer Obligations		100		92
Collateral Provided to Third-party Clearing Agents		929		717
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		38		39
Maximum exposure to loss, expires in one year or less		14,930		15,357
Maximum exposure to loss, expires in one year through three years		7,984		7,908
Maximum exposure to loss, expires in three years through five years		2,891		3,068
Maximum exposure to loss, expires after five years		554		645
Maximum exposure to loss		26,359		26,978
Standby Letters of Credit [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		8,501		8,773
Securities lending and other indemnifications [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		0		0
Maximum exposure to loss, expires in one year or less		0		0
Maximum exposure to loss, expires in one year through three years		0		0
Maximum exposure to loss, expires in three years through five years		2		2
Maximum exposure to loss, expires after five years		1,028		809
Maximum exposure to loss		1,030		811
Securities lending and other indemnifications [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		2		2
Loans and MHFS sold with recourse [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		51		51
Maximum exposure to loss, expires in one year or less		169		165
Maximum exposure to loss, expires in one year through three years		537		533
Maximum exposure to loss, expires in three years through five years		1,172		934
Maximum exposure to loss, expires after five years		9,208		9,385
Maximum exposure to loss		11,086		11,017
Loans and MHFS sold with recourse [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		8,289		8,155
Factoring guarantee [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		0		0
Maximum exposure to loss, expires in one year or less		814		747
Maximum exposure to loss, expires in one year through three years		0		0
Maximum exposure to loss, expires in three years through five years		0		0
Maximum exposure to loss, expires after five years		0		0
Maximum exposure to loss		814		747
Factoring guarantee [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		715		668
Other guarantees [Member]
Guarantor Obligations [Line Items]
Carrying Value obligation (asset)		1		1
Maximum exposure to loss, expires in one year or less		4		7
Maximum exposure to loss, expires in one year through three years		0		0
Maximum exposure to loss, expires in three years through five years		2		2
Maximum exposure to loss, expires after five years		3,828		4,175
Maximum exposure to loss		3,834		4,184
Other guarantees [Member] | Non-investment grade [Member]
Guarantor Obligations [Line Items]
Maximum exposure to loss		4		7
Loans and MHFS sold with recourse [Member]
Guarantor Obligations [Line Items]
Loans repurchased		1	$ 1
Trading assets and other [Member]
Guarantor Obligations [Line Items]
Securities owned and pledged as collateral available to be repledged, Fair Value		95,300		109,000
Trading assets and other [Member] | Collateral Pledged [Member]
Security Owned and Pledged as Collateral, Fair Value [Abstract]
Total pledged assets held for trading		43,300		41,900
Other Trading - Off-Balance Sheet [Member] | Collateral Pledged [Member]
Security Owned and Pledged as Collateral, Fair Value [Abstract]
Total pledged assets held for trading		52,100		67,300
Debt securities and other [Member] | Not Held for Trading [Member]
Guarantor Obligations [Line Items]
Securities owned and pledged as collateral available to be repledged, Fair Value		7		64
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, carrying value		4,700		5,000
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value		4,500		5,000
Consolidated VIEs [Member]
Guarantor Obligations [Line Items]
Total assets		13,384		13,617
Secured Borrowing transactions excluded [Member]
Guarantor Obligations [Line Items]
Total assets		$ 656		$ 675
[1]	(4)Our consolidated assets at March 31, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $111 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $13.0 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $28 million and $306 million; Other assets, $230 million and $342 million; and Total assets, $13.4 billion and $13.6 billion, respectively.

Guarantees, Offsetting of Resal

Guarantees, Offsetting of Resale and Repurchase Agreements and Securities Borrowing and Lending (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value	$ 4,700	$ 5,200
Net amounts in consolidated balance sheet	91,905	97,947
Collateral received, fair value	118,200	130,800
Collateral received with the right to sell or repledge	118,200	130,800
Collateral sold or repledged	52,700	66,300
Collateral pledged, fair value	99,200	113,600
Resale and securities borrowing agreements
Gross amounts recognized	108,479	121,135
Gross amounts offset in consolidated balance sheet	(16,574)	(23,188)
Net amounts in consolidated balance sheet	91,905	97,947
Collateral not recognized in consolidated balance sheet	(91,396)	(96,829)
Net amount	509	1,118
Repurchase and securities lending agreements
Gross amounts recognized	96,911	111,488
Gross amounts offset in consolidated balance sheet	(16,574)	(23,188)
Net amounts in consolidated balance sheet	80,337	88,300
Collateral pledged but not netted in consolidated balance sheet	(80,193)	(87,918)
Net amount	144	382
Fed Funds Sold, Securities Purchased under Resale Agreements and Other Short-Term Investments [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net amounts in consolidated balance sheet	73,500	78,900
Resale and securities borrowing agreements
Net amounts in consolidated balance sheet	73,500	78,900
Loans [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net amounts in consolidated balance sheet	18,400	19,000
Resale and securities borrowing agreements
Net amounts in consolidated balance sheet	$ 18,400	$ 19,000

Guarantees, Pledged Assets a111

Guarantees, Pledged Assets and Collateral Guarantees, Collateral Type and Contractual Maturities of Repurchase Agreements and Securities Lending Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	$ 86,112	$ 99,753
Securities Lending	10,799	11,735
Total Repurchases and Securities Lending	96,911	111,488
Securities of U.S. Treasury and federal agencies [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	42,646	51,144
Securities Lending	102	186
Securities of U.S. states and political subdivisions [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	29	92
Federal agencies [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	33,138	35,386
Securities Lending	1	0
Non-Agency Mortgage-backed Securities [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	1,194	1,324
Corporate debt securities [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	6,092	7,152
Securities Lending	471	619
Asset-backed Securities [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	2,121	2,034
Equity Securities
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	826	838
Securities Lending	10,225	10,930
Other [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	66	1,783
Overnight/Continuous [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	72,474	83,780
Securities Lending	10,178	9,634
Total Repurchases and Securities Lending	82,652	93,414
Up to 30 days [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	5,142	7,922
Securities Lending	0	584
Total Repurchases and Securities Lending	5,142	8,506
30-90 days [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	3,401	3,286
Securities Lending	621	1,363
Total Repurchases and Securities Lending	4,022	4,649
Over 90 days [Member]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement [Abstract]
Repurchase Agreements	5,095	4,765
Securities Lending	0	154
Total Repurchases and Securities Lending	$ 5,095	$ 4,919

Guarantees, Pledged Assets a112

Guarantees, Pledged Assets and Collateral Guarantees, Pledged Assets and Collateral, and Other Commitments Guarantees, Other Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Resale Agreements, Funded Amounts Outstanding	$ 0	$ 0
Resale Agreements, Unfunded Commitments	$ 6,300	2,800
Description of Guarantees Given by Parent Company	If issued, the Parent will fully and unconditionally guarantee securities of its 100% owned finance subsidiary, Wells Fargo Finance LLC
Purchase Commitment [Member] | Debt securities [Member]
Other Commitments [Line Items]
Other Commitment	$ 375	194
Purchase Commitment [Member] | Equity Securities
Other Commitments [Line Items]
Other Commitment	$ 2,500	$ 2,200

Legal Actions (Details)

Legal Actions (Details) $ in Millions	Jul. 13, 2012USD ($)	Apr. 20, 2017USD ($)	Mar. 31, 2018USD ($)legal_action	Jul. 31, 2017	Nov. 17, 2016legal_action	Dec. 31, 2015legal_action
Legal Actions (Textual) [Abstract]
Civil Money Penalty | $			$ 1,000
RMBS trusts at issue in the State Court Action				11
ATM Access Fee Litigation [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action					3
Automobile Lending Practices [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action			1
Collateral Protection and Guaranteed Automobile Protection [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action			1
Interchange Litigation [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Percentage Of Default Interchange Distributed To Class Merchants	0.10%
Legal Actions (Textual) [Abstract]
Loss Contingency, Estimate of Possible Loss | $	$ 6,600
Litigation Settlement, Default Interchange Distributed To Class Merchants, Distribution Period	8 months
Mortgage Interest Rate Lock [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action			2
RMBS Trustee Litigation [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action						4
Sales Practice Matters [Member]
Legal Actions (Textual) [Abstract]
Amounts To Be Paid In Connection With Legal Or Regulatory Matters | $		$ 142
Unauthorized accounts identified		3,500,000
Sales Practice Matters [Member] | All Class Members [Member]
Legal Actions (Textual) [Abstract]
Amounts To Be Paid In Connection With Legal Or Regulatory Matters | $		$ 25
Payments for Legal Settlements | $		$ 480
Liability for Contingent Litigation Losses [Member]
Legal Actions (Textual) [Abstract]
Range of possible loss, portion not accrued | $			$ 2,600
CALIFORNIA | Sales Practice Matters [Member]
Legal Actions (Textual) [Abstract]
Loss Contingency, Pending Claims, Number | legal_action			2

Derivatives, Notional or Contra

Derivatives, Notional or Contractual Amounts and Fair Values of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	$ 36,334	$ 36,355
Fair value derivative assets, netting	(24,867)	(24,127)
Net amounts in consolidated balance sheet, assets	11,467	12,228
Fair value derivative liabilities	32,672	34,298
Fair value derivative liabilities, netting	(24,789)	(25,502)
Net amounts in consolidated balance sheet, liabilities	7,883	8,796
Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(11,407)	(11,929)
Net amounts in consolidated balance sheet, assets	5,440	5,701
Fair value derivative liabilities, netting	(12,449)	(13,226)
Net amounts in consolidated balance sheet, liabilities	3,546	2,246
Commodity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(1,032)	(966)
Net amounts in consolidated balance sheet, assets	1,543	1,388
Fair value derivative liabilities, netting	(744)	(648)
Net amounts in consolidated balance sheet, liabilities	713	687
Equity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(5,997)	(4,233)
Net amounts in consolidated balance sheet, assets	1,826	2,774
Fair value derivative liabilities, netting	(5,220)	(4,041)
Net amounts in consolidated balance sheet, liabilities	2,557	4,460
Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(6,134)	(6,656)
Net amounts in consolidated balance sheet, assets	2,604	2,317
Fair value derivative liabilities, netting	(6,035)	(7,189)
Net amounts in consolidated balance sheet, liabilities	1,052	1,379
Credit Contracts Protection Sold [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(115)	(145)
Net amounts in consolidated balance sheet, assets	3	2
Fair value derivative liabilities, netting	(192)	(204)
Net amounts in consolidated balance sheet, liabilities	5	10
Credit Contracts Protection Purchased [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(182)	(198)
Net amounts in consolidated balance sheet, assets	51	46
Fair value derivative liabilities, netting	(149)	(194)
Net amounts in consolidated balance sheet, liabilities	10	14
Designated as Hedging Instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	4,156	3,974
Fair value derivative liabilities	1,466	2,229
Designated as Hedging Instrument [Member] | Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	165,802	209,677
Fair value derivative assets	2,387	2,492
Fair value derivative liabilities	724	1,092
Designated as Hedging Instrument [Member] | Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	31,720	34,135
Fair value derivative assets	1,769	1,482
Fair value derivative liabilities	742	1,137
Not Designated as Hedging Instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	32,178	32,381
Fair value derivative liabilities	31,206	32,069
Not Designated as Hedging Instrument [Member] | Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	1,471	990
Fair value derivative liabilities	690	648
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	30,707	31,391
Fair value derivative liabilities	30,516	31,421
Not Designated as Hedging Instrument [Member] | Interest rate contract [Member] | Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	197,432	220,558
Fair value derivative assets	287	159
Fair value derivative liabilities	416	201
Not Designated as Hedging Instrument [Member] | Interest rate contract [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	7,560,715	6,434,673
Fair value derivative assets	14,173	14,979
Fair value derivative liabilities	14,855	14,179
Not Designated as Hedging Instrument [Member] | Commodity contract [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	70,455	62,530
Fair value derivative assets	2,575	2,354
Fair value derivative liabilities	1,457	1,335
Not Designated as Hedging Instrument [Member] | Equity contract [Member] | Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	12,978	12,315
Fair value derivative assets	1,058	716
Fair value derivative liabilities	69	138
Not Designated as Hedging Instrument [Member] | Equity contract [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	231,036	213,750
Fair value derivative assets	6,765	6,291
Fair value derivative liabilities	7,708	8,363
Not Designated as Hedging Instrument [Member] | Foreign exchange contract [Member] | Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	15,373	15,976
Fair value derivative assets	84	78
Fair value derivative liabilities	205	309
Not Designated as Hedging Instrument [Member] | Foreign exchange contract [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	349,850	362,896
Fair value derivative assets	6,885	7,413
Fair value derivative liabilities	6,140	7,122
Not Designated as Hedging Instrument [Member] | Credit Contracts Protection Sold [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	8,826	9,021
Fair value derivative assets	118	147
Fair value derivative liabilities	197	214
Not Designated as Hedging Instrument [Member] | Credit Contracts Protection Purchased [Member] | Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	211	111
Fair value derivative assets	42	37
Fair value derivative liabilities	0	0
Not Designated as Hedging Instrument [Member] | Credit Contracts Protection Purchased [Member] | Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	17,559	17,406
Fair value derivative assets	191	207
Fair value derivative liabilities	159	208
Basis swap [Member] | Designated as Hedging Instrument [Member] | Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	0	500
Basis swap [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	$ 12,000	$ 13,500

Derivatives, Gross Fair Value o

Derivatives, Gross Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative Assets
Gross amounts recognized	$ 36,334	$ 36,355
Gross amounts offset in consolidated balance sheet	(24,867)	(24,127)
Net amounts in consolidated balance sheet, assets	11,467	12,228
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(880)	(773)
Net amounts	10,587	11,455
Derivative Liabilities
Gross amounts recognized	32,672	34,298
Gross amounts offset in consolidated balance sheet, liabilities	(24,789)	(25,502)
Net amounts in consolidated balance sheet, liabilities	7,883	8,796
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(1,131)	(1,692)
Net amounts	6,752	7,104
Derivatives (Textual) [Abstract]
Derivative assets subject to enforceable master netting arrangements	31,800	30,000
Derivative liabilities subject to enforceable master netting arrangements	29,600	29,900
Derivative assets not subject to enforceable master netting arrangements	4,500	6,400
Derivative liabilities not subject to enforceable master netting arrangements	3,100	4,400
Valuation adjustments for derivative assets	283	245
Valuation adjustments for derivative liabilities	132	95
Cash collateral netted against derivative assets	3,700	2,700
Cash collateral netted against derivative liabilities	3,700	4,200
Interest rate contract [Member]
Derivative Assets
Gross amounts recognized	16,847	17,630
Gross amounts offset in consolidated balance sheet	(11,407)	(11,929)
Net amounts in consolidated balance sheet, assets	5,440	5,701
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(91)	(145)
Net amounts	$ 5,349	$ 5,556
Percent exchanged in the over the counter market	98.00%	99.00%
Derivative Liabilities
Gross amounts recognized	$ 15,995	$ 15,472
Gross amounts offset in consolidated balance sheet, liabilities	(12,449)	(13,226)
Net amounts in consolidated balance sheet, liabilities	3,546	2,246
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(755)	(1,078)
Net amounts	$ 2,791	$ 1,168
Percent exchanged in over-the-counter market	97.00%	99.00%
Commodity contract [Member]
Derivative Assets
Gross amounts recognized	$ 2,575	$ 2,354
Gross amounts offset in consolidated balance sheet	(1,032)	(966)
Net amounts in consolidated balance sheet, assets	1,543	1,388
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(3)	(4)
Net amounts	$ 1,540	$ 1,384
Percent exchanged in the over the counter market	87.00%	88.00%
Derivative Liabilities
Gross amounts recognized	$ 1,457	$ 1,335
Gross amounts offset in consolidated balance sheet, liabilities	(744)	(648)
Net amounts in consolidated balance sheet, liabilities	713	687
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	0	(1)
Net amounts	$ 713	$ 686
Percent exchanged in over-the-counter market	69.00%	76.00%
Equity contract [Member]
Derivative Assets
Gross amounts recognized	$ 7,823	$ 7,007
Gross amounts offset in consolidated balance sheet	(5,997)	(4,233)
Net amounts in consolidated balance sheet, assets	1,826	2,774
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(559)	(596)
Net amounts	$ 1,267	$ 2,178
Percent exchanged in the over the counter market	77.00%	76.00%
Derivative Liabilities
Gross amounts recognized	$ 7,777	$ 8,501
Gross amounts offset in consolidated balance sheet, liabilities	(5,220)	(4,041)
Net amounts in consolidated balance sheet, liabilities	2,557	4,460
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(247)	(400)
Net amounts	$ 2,310	$ 4,060
Percent exchanged in over-the-counter market	82.00%	85.00%
Foreign exchange contract [Member]
Derivative Assets
Gross amounts recognized	$ 8,738	$ 8,973
Gross amounts offset in consolidated balance sheet	(6,134)	(6,656)
Net amounts in consolidated balance sheet, assets	2,604	2,317
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(226)	(25)
Net amounts	$ 2,378	$ 2,292
Percent exchanged in the over the counter market	100.00%	100.00%
Derivative Liabilities
Gross amounts recognized	$ 7,087	$ 8,568
Gross amounts offset in consolidated balance sheet, liabilities	(6,035)	(7,189)
Net amounts in consolidated balance sheet, liabilities	1,052	1,379
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(124)	(204)
Net amounts	$ 928	$ 1,175
Percent exchanged in over-the-counter market	100.00%	100.00%
Credit Contracts Protection Sold [Member]
Derivative Assets
Gross amounts recognized	$ 118	$ 147
Gross amounts offset in consolidated balance sheet	(115)	(145)
Net amounts in consolidated balance sheet, assets	3	2
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	0	0
Net amounts	$ 3	$ 2
Percent exchanged in the over the counter market	11.00%	10.00%
Derivative Liabilities
Gross amounts recognized	$ 197	$ 214
Gross amounts offset in consolidated balance sheet, liabilities	(192)	(204)
Net amounts in consolidated balance sheet, liabilities	5	10
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(5)	(9)
Net amounts	$ 0	$ 1
Percent exchanged in over-the-counter market	84.00%	85.00%
Credit Contracts Protection Purchased [Member]
Derivative Assets
Gross amounts recognized	$ 233	$ 244
Gross amounts offset in consolidated balance sheet	(182)	(198)
Net amounts in consolidated balance sheet, assets	51	46
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	(1)	(3)
Net amounts	$ 50	$ 43
Percent exchanged in the over the counter market	89.00%	89.00%
Derivative Liabilities
Gross amounts recognized	$ 159	$ 208
Gross amounts offset in consolidated balance sheet, liabilities	(149)	(194)
Net amounts in consolidated balance sheet, liabilities	10	14
Gross amounts not offset in consolidated balance sheet (Disclosure-only netting)	0	0
Net amounts	$ 10	$ 14
Percent exchanged in over-the-counter market	9.00%	9.00%

Derivatives, Derivatives in Fai

Derivatives, Derivatives in Fair Value and Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Line Items Presented in the Consolidated Statement of Income [Abstract]
Debt securities	$ 3,414	$ 3,173	[1],[2]
Loans	10,579	10,141
Mortgages held for sale (2)	179	182	[2]
Deposits (2)	(1,090)	(536)	[2]
Long-term debt (2)	(1,576)	(1,147)	[2]
Other	602	374	[2]
Total amounts of line items presented in the consolidated statement of income	12,108	12,187
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	(60)	202
Derivatives (Textual) [Abstract]
Deferred net gains on derivatives in other comprehensive income	(309)
Time value component recognized as net interest income (expense) on forward derivatives excluded from the assessment of hedge effectiveness	0	(1)
Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	(107)	324
Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	(60)	202
Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	83	294
Recognized on derivatives	(1,585)	(439)
Recognized on hedged items	1,498	424
Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	(60)	202
Net income (expense) recognized on cash flow hedges	(60)	202
Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	(75)	(29)
Recognized on derivatives	493	334
Recognized on hedged items	(521)	(260)
Debt securities [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	(94)	(139)
Debt securities [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	(82)	(131)
Recognized on derivatives	950	126
Recognized on hedged items	(968)	(141)
Debt securities [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	0	0
Net income (expense) recognized on cash flow hedges	0	0
Debt securities [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	5	4
Recognized on derivatives	4	6
Recognized on hedged items	(3)	(3)
Loans [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	0	(1)
Loans [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	(1)
Recognized on derivatives	1	1
Recognized on hedged items	(1)	(1)
Loans [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	(60)	205
Net income (expense) recognized on cash flow hedges	(60)	205
Loans [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	0
Recognized on derivatives	0	0
Recognized on hedged items	0	0
Mortgages held for sale [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	(3)	(3)
Mortgages held for sale [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	(1)	(1)
Recognized on derivatives	6	(2)
Recognized on hedged items	(8)	0
Mortgages held for sale [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	0	0
Net income (expense) recognized on cash flow hedges	0	0
Mortgages held for sale [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	0
Recognized on derivatives	0	0
Recognized on hedged items	0	0
Deposits [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	(13)	14
Deposits [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	(5)	12
Recognized on derivatives	(149)	(8)
Recognized on hedged items	141	10
Deposits [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	0	0
Net income (expense) recognized on cash flow hedges	0	0
Deposits [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	0
Recognized on derivatives	0	0
Recognized on hedged items	0	0
Long-term debt [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	(30)	418
Long-term debt [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	171	415
Recognized on derivatives	(2,393)	(556)
Recognized on hedged items	2,334	556
Long-term debt [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	0	(3)
Net income (expense) recognized on cash flow hedges	0	(3)
Long-term debt [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	(80)	(33)
Recognized on derivatives	(171)	(47)
Recognized on hedged items	109	83
Other noninterest income [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Net income (expense) recognized on fair value hedges	33	35
Other noninterest income [Member] | Interest rate contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	0
Recognized on derivatives	0	0
Recognized on hedged items	0	0
Other noninterest income [Member] | Interest rate contract [Member] | Cash Flow Hedging [Member]
Gains (losses) on cash flow hedging relationships
Realized gains (losses) (pre tax) reclassified from cumulative OCI into net income	0	0
Net income (expense) recognized on cash flow hedges	0	0
Other noninterest income [Member] | Foreign exchange contract [Member] | Fair Value Hedging [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	0	0
Recognized on derivatives	660	375
Recognized on hedged items	(627)	(340)
Off market premium amortization [Member]
Gains (losses) on fair value hedging relationships
Amounts related to interest accruals on derivatives	$ 7	$ 5
[1]	(1)Financial information for the prior period has been revised to reflect the impact of the adoption of Accounting Standards Update (ASU) 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

Derivatives, Fair Value Hedging

Derivatives, Fair Value Hedging Basis Adjustment (Details) - Fair Value Hedging [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Hedged Items Currently Designated [Member] | Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	$ 31,023	$ 32,498
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	(301)	870
Hedged Items Currently Designated [Member] | Loans [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	135	140
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	(1)	(1)
Hedged Items Currently Designated [Member] | Mortgages held for sale [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	822	465
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	1	(1)
Hedged Items Currently Designated [Member] | Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(29,564)	(23,679)
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	298	158
Hedged Items Currently Designated [Member] | Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(125,876)	(128,950)
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	265	(2,154)
Hedged Items No Longer Designated [Member] | Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	4,916	5,221
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	288	343
Hedged Items No Longer Designated [Member] | Loans [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	0	0
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	0	0
Hedged Items No Longer Designated [Member] | Mortgages held for sale [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	0	0
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	0	0
Hedged Items No Longer Designated [Member] | Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	0	0
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	0	0
Hedged Items No Longer Designated [Member] | Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(805)	(1,953)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	13	16
Foreign exchange contract [Member] | Hedged Items Currently Designated [Member] | Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	1,500	1,500
Foreign exchange contract [Member] | Hedged Items Currently Designated [Member] | Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(7,400)	(7,700)
Re-designated as hedging instrument [Member] | Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	1,700	2,100
Re-designated as hedging instrument [Member] | Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	$ 266	$ 297

Derivatives, Derivatives Not De

Derivatives, Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivatives (Textual) [Abstract]
Gains (losses) on derivatives used to hedge residential mortgage servicing rights	$ (1,220)	$ (72)
Fair Value of Net Asset (Liability) From Economic Hedges Related To Mortgage Servicing Activities	(13)		$ 89
Aggregate fair value of derivative loan commitments net asset (liability)	37		$ 17
Not Designated as Hedging Instrument [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(50)	(1,202)
Not Designated as Hedging Instrument [Member] | Mortgage banking [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(854)	184
Not Designated as Hedging Instrument [Member] | Net gain (loss) from equity investments [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(58)	(474)
Not Designated as Hedging Instrument [Member] | Net gain (loss) from trading activities [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	1,203	(828)
Not Designated as Hedging Instrument [Member] | Other [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(341)	(84)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(799)	(567)
Derivatives (Textual) [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain	28	2
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(586)	(3)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(58)	(481)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(159)	(87)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	4	4
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Mortgage banking [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(595)	(9)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(595)	(9)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity investments [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(58)	(474)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity investments [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity investments [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(58)	(474)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity investments [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity investments [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Other [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(146)	(84)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Other [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	9	6
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Other [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	(7)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Other [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(159)	(87)
Not Designated as Hedging Instrument [Member] | Economic hedges [Member] | Other [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	4	4
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	749	(635)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	126	238
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	264	(1,109)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	310	179
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	10	(15)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Commodity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	39	60
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	12
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(259)	193
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(259)	193
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Commodity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Other contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Commodity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity investments [Member] | Other contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	1,203	(828)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	385	45
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	459	(1,109)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	310	179
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	10	(15)
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Commodity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	39	60
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Other contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	12
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(195)	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Interest contracts [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Equity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	(195)	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Foreign exchange contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Credit contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Commodity contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	0	0
Not Designated as Hedging Instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Other contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]
Net gains (losses) recognized related to derivatives not designated as hedging instruments	$ 0	$ 0

Derivatives, Sold and Purchased

Derivatives, Sold and Purchased Credit Derivatives (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	$ 197	$ 214
Notional amount Protection sold	8,826	9,021
Notional amount Protection purchased with identical underlyings	2,694	2,558
Notional Net protection sold	6,132	6,463
Notional Other protection purchased	15,076	14,959
Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	5,116	4,608
Corporate bonds [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	34	35
Notional amount Protection sold	2,152	2,007
Notional amount Protection purchased with identical underlyings	1,669	1,575
Notional Net protection sold	483	432
Notional Other protection purchased	$ 988	$ 946
Corporate bonds [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2018	Jan. 1, 2018
Corporate bonds [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2027	Dec. 31, 2027
Corporate bonds [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 531	$ 510
Structured products [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	78	86
Notional amount Protection sold	184	267
Notional amount Protection purchased with identical underlyings	166	232
Notional Net protection sold	18	35
Notional Other protection purchased	$ 124	$ 153
Structured products [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2022	Jan. 1, 2022
Structured products [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2047	Dec. 31, 2047
Structured products [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 179	$ 252
Credit default swap [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	0	0
Notional amount Protection sold	2,225	2,626
Notional amount Protection purchased with identical underlyings	395	308
Notional Net protection sold	1,830	2,318
Notional Other protection purchased	$ 3,458	$ 3,932
Credit default swap [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2018	Jan. 1, 2018
Credit default swap [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2028	Dec. 31, 2027
Credit default swap [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 525	$ 540
Commercial Mortgage Backed Securities [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	75	83
Notional amount Protection sold	444	423
Notional amount Protection purchased with identical underlyings	421	401
Notional Net protection sold	23	22
Notional Other protection purchased	$ 47	$ 87
Commercial Mortgage Backed Securities [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2047	Jan. 1, 2047
Commercial Mortgage Backed Securities [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2058	Dec. 31, 2058
Commercial Mortgage Backed Securities [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 164	$ 0
Asset-backed securities [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	10	9
Notional amount Protection sold	43	42
Notional amount Protection purchased with identical underlyings	43	42
Notional Net protection sold	0	0
Notional Other protection purchased	$ 1	$ 1
Asset-backed securities [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2045	Jan. 1, 2045
Asset-backed securities [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2046	Dec. 31, 2046
Asset-backed securities [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 43	$ 0
Other Credit Derivatives [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	0	1
Notional amount Protection sold	3,778	3,656
Notional amount Protection purchased with identical underlyings	0	0
Notional Net protection sold	3,778	3,656
Notional Other protection purchased	$ 10,458	$ 9,840
Other Credit Derivatives [Member] | Minimum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Jan. 1, 2018	Jan. 1, 2018
Other Credit Derivatives [Member] | Maximum [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Derivative range of maturity dates	Dec. 31, 2031	Dec. 31, 2031
Other Credit Derivatives [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount Protection sold	$ 3,674	$ 3,306

Derivatives Credit-Risk Conting

Derivatives Credit-Risk Contingent Feature Textuals (Details) - USD ($) $ in Billions	Mar. 31, 2018	Dec. 31, 2017
Derivatives [Abstract]
Aggregate fair value of derivative instruments with credit-risk-related contingent features, net liability	$ 7.3	$ 8.3
Collateral for derivative instruments with credit-risk-related contingent features	5.9	7.1
Additional collateral for derivative instruments with credit-risk-related contingent features	$ 1.3	$ 1.2

Fair Value, Measurements From B

Fair Value, Measurements From Brokers or Third Party Pricing Services (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial assets
Equity Securities	$ 58,935	$ 62,497
Derivative assets	36,334	36,355
Financial liabilities
Derivative liabilities	(32,672)	(34,298)
Brokers [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets
Trading debt securities	0	0
Equity Securities	0	0
Derivative assets	0	0
Financial liabilities
Derivative liabilities	0	0
Other liabilities (2)	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 1 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Trading debt securities	0	0
Equity Securities	0	0
Derivative assets	0	0
Financial liabilities
Derivative liabilities	0	0
Other liabilities (2)	0	0
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	264	340
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	33	33
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	231	307
Brokers [Member] | Fair Value, Inputs, Level 2 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Trading debt securities	0	0
Equity Securities	0	0
Derivative assets	0	0
Financial liabilities
Derivative liabilities	0	0
Other liabilities (2)	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	1,077	1,158
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	0	0
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	1,077	1,158
Brokers [Member] | Fair Value, Inputs, Level 3 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets
Trading debt securities	105	926
Equity Securities	0	0
Derivative assets	17	19
Financial liabilities
Derivative liabilities	(17)	(19)
Other liabilities (2)	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	3,362	3,389
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	3,362	3,389
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 1 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Trading debt securities	229	215
Equity Securities	227	227
Derivative assets	0	0
Financial liabilities
Derivative liabilities	0	0
Other liabilities (2)	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	262,812	266,744
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	225	227
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	2,917	2,930
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	47,951	50,401
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	165,656	168,948
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	46,288	44,465
Third party pricing services [Member] | Fair Value, Inputs, Level 2 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	2	0
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Trading debt securities	0	0
Equity Securities	293	0
Derivative assets	0	0
Financial liabilities
Derivative liabilities	0	0
Other liabilities (2)	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Debt securities [Member]
Financial assets
Available-for-sale Securities	250	146
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities
Financial assets
Equity Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Financial assets
Available-for-sale Securities	0	0
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. states and political subdivisions [Member]
Financial assets
Available-for-sale Securities	44	49
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Financial assets
Available-for-sale Securities	67	75
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities
Financial assets
Available-for-sale Securities	139	22
Third party pricing services [Member] | Fair Value, Inputs, Level 3 [Member] | Nonmarketable Equity Securities
Financial assets
Equity Securities	$ 293	$ 0

Fair Value, Assets and Liabilit

Fair Value, Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 271,656	$ 276,407	[1]
Assets:
Mortgages held for sale	13,859	16,116
Loans held for sale	1,695	1,023
Loans	352	376
Mortgage servicing rights	15,041	13,625
Derivative assets	36,334	36,355
Net amounts in consolidated balance sheet, assets	11,467	12,228
Equity Securities	58,935	62,497
Liabilities:
Total derivative liabilities	(32,672)	(34,298)
Fair value liability derivatives, net	(7,883)	(8,796)
Interest rate contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets	5,440	5,701
Liabilities:
Fair value liability derivatives, net	(3,546)	(2,246)
Commodity contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets	1,543	1,388
Liabilities:
Fair value liability derivatives, net	(713)	(687)
Equity contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets	1,826	2,774
Liabilities:
Fair value liability derivatives, net	(2,557)	(4,460)
Foreign exchange contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets	2,604	2,317
Liabilities:
Fair value liability derivatives, net	(1,052)	(1,379)
Fair Value, Measurements, Recurring [Member]
Assets:
Trading debt securities	59,866	57,624
Mortgages held for sale	13,859	16,116
Loans held for sale	1,695	1,023
Loans	352	376
Mortgage servicing rights	15,041	13,625
Fair value asset derivatives, netting	(24,867)	(24,127)
Net amounts in consolidated balance sheet, assets	11,467	12,228
Equity Securities	35,529	39,227
Liabilities:
Fair value liability derivatives, netting	24,789	25,502
Fair value liability derivatives, net	(7,883)	(8,796)
Total short sale liabilities	(23,303)	(18,472)
Other liabilities (2)	(2)	(3)
Total liabilities recorded at fair value	(31,188)	(27,271)
Fair Value, Measurements, Recurring [Member] | Interest rate contract [Member]
Assets:
Derivative assets	16,847	17,630
Liabilities:
Total derivative liabilities	(15,995)	(15,472)
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member]
Assets:
Derivative assets	2,575	2,354
Liabilities:
Total derivative liabilities	(1,457)	(1,335)
Fair Value, Measurements, Recurring [Member] | Equity contract [Member]
Assets:
Derivative assets	7,823	7,007
Liabilities:
Total derivative liabilities	(7,777)	(8,501)
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets	8,738	8,973
Liabilities:
Total derivative liabilities	(7,087)	(8,568)
Fair Value, Measurements, Recurring [Member] | Credit contract [Member]
Assets:
Derivative assets	351	391
Liabilities:
Total derivative liabilities	(356)	(422)
Fair Value, Measurements, Recurring [Member] | Debt securities [Member]
Assets:
Available-for-sale Securities	271,656	276,407
Fair Value, Measurements, Recurring [Member] | Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	16,139	14,874
Available-for-sale Securities	6,279	6,319
Liabilities:
Total short sale liabilities	(14,813)	(10,988)
Fair Value, Measurements, Recurring [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities	3,437	3,735
Available-for-sale Securities	49,643	51,326
Liabilities:
Total short sale liabilities	(18)
Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets:
Trading debt securities	961	919
Available-for-sale Securities	36,752	36,056
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	12,411	11,791
Available-for-sale Securities	7,183	7,666
Liabilities:
Total short sale liabilities	(5,962)	(4,986)
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]
Assets:
Trading debt securities	25,755	25,273
Available-for-sale Securities	166,078	169,392
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale Securities	156,814	160,219
Fair Value, Measurements, Recurring [Member] | Residential [Member]
Assets:
Available-for-sale Securities	4,474	4,608
Fair Value, Measurements, Recurring [Member] | Commercial [Member]
Assets:
Available-for-sale Securities	4,790	4,565
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities	1,132	993
Available-for-sale Securities	5,720	5,648
Fair Value, Measurements, Recurring [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale Securities	572	553
Fair Value, Measurements, Recurring [Member] | Home equity loans [Member]
Assets:
Available-for-sale Securities	146	149
Fair Value, Measurements, Recurring [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale Securities	5,002	4,946
Fair Value, Measurements, Recurring [Member] | Other Trading Debt Securities [Domain]
Assets:
Trading debt securities	31	39
Fair Value, Measurements, Recurring [Member] | Other debt securities
Assets:
Available-for-sale Securities	1	0
Fair Value, Measurements, Recurring [Member] | Other short sale liabilities [Member]
Liabilities:
Total short sale liabilities	0	(285)
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities
Assets:
Equity Securities	30,258	34,360
Fair Value, Measurements, Recurring [Member] | Nonmarketable Equity Securities
Assets:
Equity Securities	5,271	4,867
Fair Value, Measurements, Recurring [Member] | Equity Securities
Liabilities:
Total short sale liabilities	(2,510)	(2,213)
Fair Value, Measurements, Recurring [Member] | Excluding NAV Investments [Member]
Assets:
Total assets recorded at fair value	409,465	416,626
Fair Value, Measurements, Recurring [Member] | Equity Investments [Member]
Assets:
Investments Net Asset Value	32	0
Fair Value, Measurements, Recurring [Member] | Including NAV Investments [Member]
Assets:
Total assets recorded at fair value	409,497	416,626
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Trading debt securities	13,419	12,491
Mortgages held for sale	0	0
Loans held for sale	0	0
Loans	0	0
Mortgage servicing rights	0	0
Fair value asset derivatives, netting	0	0
Net amounts in consolidated balance sheet, assets	1,832	1,734
Equity Securities	29,705	33,931
Total assets recorded at fair value	48,372	51,601
Liabilities:
Fair value liability derivatives, netting	0	0
Fair value liability derivatives, net	(1,428)	(1,349)
Total short sale liabilities	(16,702)	(12,588)
Other liabilities (2)	0	0
Total liabilities recorded at fair value	(18,130)	(13,937)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate contract [Member]
Assets:
Derivative assets	20	17
Liabilities:
Total derivative liabilities	(20)	(17)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity contract [Member]
Assets:
Derivative assets	0	0
Liabilities:
Total derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity contract [Member]
Assets:
Derivative assets	1,795	1,698
Liabilities:
Total derivative liabilities	(1,391)	(1,313)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets	17	19
Liabilities:
Total derivative liabilities	(17)	(19)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Credit contract [Member]
Assets:
Derivative assets	0	0
Liabilities:
Total derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt securities [Member]
Assets:
Available-for-sale Securities	3,416	3,445
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	13,419	12,491
Available-for-sale Securities	3,362	3,389
Liabilities:
Total short sale liabilities	(14,243)	(10,420)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	0	0
Liabilities:
Total short sale liabilities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Loan Obligations [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	54	56
Liabilities:
Total short sale liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Home equity loans [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Trading Debt Securities [Domain]
Assets:
Trading debt securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other short sale liabilities [Member]
Liabilities:
Total short sale liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities
Assets:
Equity Securities	29,705	33,931
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Nonmarketable Equity Securities
Assets:
Equity Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities
Liabilities:
Total short sale liabilities	(2,459)	(2,168)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Trading debt securities	46,076	44,726
Mortgages held for sale	12,909	15,118
Loans held for sale	1,695	1,009
Loans	0	0
Mortgage servicing rights	0	0
Fair value asset derivatives, netting	0	0
Net amounts in consolidated balance sheet, assets	32,775	32,980
Equity Securities	605	475
Total assets recorded at fair value	359,659	364,276
Liabilities:
Fair value liability derivatives, netting	0	0
Fair value liability derivatives, net	(29,239)	(30,930)
Total short sale liabilities	(6,601)	(5,884)
Other liabilities (2)	0	0
Total liabilities recorded at fair value	(35,840)	(36,814)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate contract [Member]
Assets:
Derivative assets	16,728	17,479
Liabilities:
Total derivative liabilities	(15,868)	(15,392)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity contract [Member]
Assets:
Derivative assets	2,547	2,318
Liabilities:
Total derivative liabilities	(1,439)	(1,318)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity contract [Member]
Assets:
Derivative assets	4,562	3,970
Liabilities:
Total derivative liabilities	(4,598)	(5,338)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets	8,707	8,944
Liabilities:
Total derivative liabilities	(7,057)	(8,546)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Credit contract [Member]
Assets:
Derivative assets	231	269
Liabilities:
Total derivative liabilities	(277)	(336)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt securities [Member]
Assets:
Available-for-sale Securities	265,599	269,968
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	2,720	2,383
Available-for-sale Securities	2,917	2,930
Liabilities:
Total short sale liabilities	(570)	(568)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities	3,434	3,732
Available-for-sale Securities	49,026	50,401
Liabilities:
Total short sale liabilities	(18)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Loan Obligations [Member]
Assets:
Trading debt securities	645	565
Available-for-sale Securities	35,707	35,036
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	12,377	11,760
Available-for-sale Securities	6,719	7,203
Liabilities:
Total short sale liabilities	(5,962)	(4,986)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Assets:
Trading debt securities	25,755	25,273
Available-for-sale Securities	166,010	169,316
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale Securities	156,814	160,219
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential [Member]
Assets:
Available-for-sale Securities	4,473	4,607
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial [Member]
Assets:
Available-for-sale Securities	4,723	4,490
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities	1,132	993
Available-for-sale Securities	5,219	5,082
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale Securities	572	553
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Home equity loans [Member]
Assets:
Available-for-sale Securities	146	149
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale Securities	4,501	4,380
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Trading Debt Securities [Domain]
Assets:
Trading debt securities	13	20
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities
Assets:
Available-for-sale Securities	1	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other short sale liabilities [Member]
Liabilities:
Total short sale liabilities	0	(285)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities
Assets:
Equity Securities	553	429
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Nonmarketable Equity Securities
Assets:
Equity Securities	52	46
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities
Liabilities:
Total short sale liabilities	(51)	(45)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Trading debt securities	371	407
Mortgages held for sale	950	998
Loans held for sale	0	14
Loans	352	376
Mortgage servicing rights	15,041	13,625
Fair value asset derivatives, netting	0	0
Net amounts in consolidated balance sheet, assets	1,727	1,641
Equity Securities	5,219	4,821
Total assets recorded at fair value	26,301	24,876
Liabilities:
Fair value liability derivatives, netting	0	0
Fair value liability derivatives, net	(2,005)	(2,019)
Total short sale liabilities	0	0
Other liabilities (2)	(2)	(3)
Total liabilities recorded at fair value	(2,007)	(2,022)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate contract [Member]
Assets:
Derivative assets	99	134
Liabilities:
Total derivative liabilities	(107)	(63)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity contract [Member]
Assets:
Derivative assets	28	36
Liabilities:
Total derivative liabilities	(18)	(17)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity contract [Member]
Assets:
Derivative assets	1,466	1,339
Liabilities:
Total derivative liabilities	(1,788)	(1,850)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets	14	10
Liabilities:
Total derivative liabilities	(13)	(3)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Credit contract [Member]
Assets:
Derivative assets	120	122
Liabilities:
Total derivative liabilities	(79)	(86)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt securities [Member]
Assets:
Available-for-sale Securities	2,641	2,994
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	0	0
Liabilities:
Total short sale liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities	3	3
Available-for-sale Securities	617	925
Liabilities:
Total short sale liabilities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Loan Obligations [Member]
Assets:
Trading debt securities	316	354
Available-for-sale Securities	1,045	1,020
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	34	31
Available-for-sale Securities	410	407
Liabilities:
Total short sale liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	68	76
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential [Member]
Assets:
Available-for-sale Securities	1	1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial [Member]
Assets:
Available-for-sale Securities	67	75
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale Securities	501	566
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Home equity loans [Member]
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale Securities	501	566
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Trading Debt Securities [Domain]
Assets:
Trading debt securities	18	19
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities
Assets:
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other short sale liabilities [Member]
Liabilities:
Total short sale liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities
Assets:
Equity Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Nonmarketable Equity Securities
Assets:
Equity Securities	5,219	4,821
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities
Liabilities:
Total short sale liabilities	0	0
Collateralized Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 1,000	$ 1,000
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Fair Value, Transfers Between F

Fair Value, Transfers Between Fair Value Levels (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	$ 0	$ 0
Trading assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Available-for-sale securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Mortgages held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Loans held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Net derivative assets and liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Short sale liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Total	0	0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	(11)	0
Fair Value, Inputs, Level 1 [Member] | Trading assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 1 [Member] | Available-for-sale securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 1 [Member] | Mortgages held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 1 [Member] | Loans held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	(11)	0
Fair Value, Inputs, Level 1 [Member] | Net derivative assets and liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 1 [Member] | Short sale liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	234	77
Transfer Out	(19)	(28)
Fair Value, Inputs, Level 2 [Member] | Trading assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	1
Transfer Out	0	(3)
Fair Value, Inputs, Level 2 [Member] | Available-for-sale securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	269	72
Transfer Out	0	(5)
Fair Value, Inputs, Level 2 [Member] | Mortgages held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	3	1
Transfer Out	(15)	(42)
Fair Value, Inputs, Level 2 [Member] | Loans held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	11	0
Transfer Out	(4)	0
Fair Value, Inputs, Level 2 [Member] | Net derivative assets and liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	(49)	3
Transfer Out	0	22
Fair Value, Inputs, Level 2 [Member] | Short sale liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	19	28
Transfer Out	(223)	(77)
Fair Value, Inputs, Level 3 [Member] | Trading assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	3
Transfer Out	0	(1)
Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	5
Transfer Out	(269)	(72)
Fair Value, Inputs, Level 3 [Member] | Mortgages held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	15	42
Transfer Out	(3)	(1)
Fair Value, Inputs, Level 3 [Member] | Loans held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	4	0
Transfer Out	0	0
Fair Value, Inputs, Level 3 [Member] | Net derivative assets and liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	(22)
Transfer Out	49	(3)
Fair Value, Inputs, Level 3 [Member] | Short sale liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis Transfers Between Fair Value Levels [Line Items]
Transfer In	0	0
Transfer Out	$ 0	$ 0

Fair Value, Assets and Liabi124

Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trading assets [Member]
Assets:
Balance, beginning of period	$ 407	$ 374
Net gains (losses) included in net income	1	4
Net gains (losses) included in other comprehensive income	0	(2)
Purchases, sales, issuances and settlements, net	(37)	86
Transfers into Level 3	0	3
Transfers out of Level 3	0	(1)
Balance, end of period	371	464
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	16	0
Trading assets [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Balance, beginning of period	3	3
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	3	3
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Trading assets [Member] | Mortgage-Backed Securities [Member]
Assets:
Balance, beginning of period	0	0
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Trading assets [Member] | Collateralized Loan Obligations [Member]
Assets:
Balance, beginning of period	354	309
Net gains (losses) included in net income	2	4
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(40)	85
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	316	398
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	16	0
Trading assets [Member] | Corporate debt securities [Member]
Assets:
Balance, beginning of period	31	34
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	3	1
Transfers into Level 3	0	3
Transfers out of Level 3	0	(1)
Balance, end of period	34	37
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Trading assets [Member] | Asset-backed securities [Member]
Assets:
Balance, beginning of period	0	0
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Trading assets [Member] | Other Trading Debt Securities [Domain]
Assets:
Balance, beginning of period	19	28
Net gains (losses) included in net income	(1)	0
Net gains (losses) included in other comprehensive income	0	(2)
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	18	26
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	(1)
Mortgages held for sale [Member]
Assets:
Balance, beginning of period	998	985
Net gains (losses) included in net income	(23)	(9)
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(37)	(60)
Transfers into Level 3	15	42
Transfers out of Level 3	(3)	(1)
Balance, end of period	950	957
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	(23)	(11)
Loans held for sale [Member]
Assets:
Balance, beginning of period	14	0
Net gains (losses) included in net income	2	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(16)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Loans [Member]
Assets:
Balance, beginning of period	376	758
Net gains (losses) included in net income	(1)	(6)
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(23)	(247)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	352	505
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	(4)	(5)
Mortgage servicing rights [Member]
Assets:
Balance, beginning of period	13,625	12,959
Net gains (losses) included in net income	847	(287)
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	569	536
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	15,041	13,208
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	1,330	174
Derivative [Member]
Assets and Liabilities:
Balance, beginning of period	(378)	(81)
Net gains (losses) included in net income	(260)	176
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	311	(78)
Transfers into Level 3	0	(22)
Transfers out of Level 3	49	(3)
Balance, end of period	(278)	(8)
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	(47)	27
Derivative [Member] | Interest rate contract [Member]
Assets and Liabilities:
Balance, beginning of period	71	121
Net gains (losses) included in net income	(345)	209
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	266	(112)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(8)	218
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	(73)	85
Derivative [Member] | Commodity contract [Member]
Assets and Liabilities:
Balance, beginning of period	19	23
Net gains (losses) included in net income	15	2
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(24)	(6)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	10	19
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	7
Derivative [Member] | Equity contract [Member]
Assets and Liabilities:
Balance, beginning of period	(511)	(267)
Net gains (losses) included in net income	69	(44)
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	71	37
Transfers into Level 3	0	(22)
Transfers out of Level 3	49	(3)
Balance, end of period	(322)	(299)
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	25	(57)
Derivative [Member] | Foreign exchange contract [Member]
Assets and Liabilities:
Balance, beginning of period	7	12
Net gains (losses) included in net income	(7)	(9)
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	1	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	1	3
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	(3)	(5)
Derivative [Member] | Credit contract [Member]
Assets and Liabilities:
Balance, beginning of period	36	77
Net gains (losses) included in net income	8	7
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(3)	3
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	41	87
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	4	(14)
Derivative [Member] | Other contract [Member]
Assets and Liabilities:
Balance, beginning of period	0	(47)
Net gains (losses) included in net income	0	11
Total net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	(36)
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	11
Equity Securities
Assets:
Balance, beginning of period	5,203	3,259
Net gains (losses) included in net income	108	481
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(96)	0
Transfers into Level 3	4	0
Transfers out of Level 3	0	0
Balance, end of period	5,219	3,740
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	101	485
Equity Securities | Marketable Equity Securities
Assets:
Balance, beginning of period	0	0
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Equity Securities | Nonmarketable Equity Securities
Assets:
Balance, beginning of period	5,203	3,259
Net gains (losses) included in net income	108	481
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	(96)	0
Transfers into Level 3	4	0
Transfers out of Level 3	0	0
Balance, end of period	5,219	3,740
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	101	485
Short sale liabilities [Member]
Liabilities:
Balance, beginning of period	0	0
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Other liabilities [Member]
Liabilities:
Balance, beginning of period	(3)	(4)
Net gains (losses) included in net income	1	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(2)	(4)
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Debt securities [Member]
Assets:
Balance, beginning of period	2,994	3,505
Net gains (losses) included in net income	19	(12)
Net gains (losses) included in other comprehensive income	36	57
Purchases, sales, issuances and settlements, net	(139)	167
Transfers into Level 3	0	5
Transfers out of Level 3	(269)	(72)
Balance, end of period	2,641	3,650
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	(4)
Available-for-sale securities [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Balance, beginning of period	925	1,140
Net gains (losses) included in net income	4	0
Net gains (losses) included in other comprehensive income	(2)	2
Purchases, sales, issuances and settlements, net	(41)	285
Transfers into Level 3	0	5
Transfers out of Level 3	(269)	(72)
Balance, end of period	617	1,360
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Mortgage-Backed Securities [Member]
Assets:
Balance, beginning of period	76	92
Net gains (losses) included in net income	1	(3)
Net gains (losses) included in other comprehensive income	(1)	4
Purchases, sales, issuances and settlements, net	(8)	(3)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	68	90
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	(4)
Available-for-sale securities [Member] | Residential [Member]
Assets:
Balance, beginning of period	1	1
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	1	1
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Commercial [Member]
Assets:
Balance, beginning of period	75	91
Net gains (losses) included in net income	1	(3)
Net gains (losses) included in other comprehensive income	(1)	4
Purchases, sales, issuances and settlements, net	(8)	(3)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	67	89
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	(4)
Available-for-sale securities [Member] | Collateralized Loan Obligations [Member]
Assets:
Balance, beginning of period	1,020	879
Net gains (losses) included in net income	5	5
Net gains (losses) included in other comprehensive income	43	41
Purchases, sales, issuances and settlements, net	(23)	39
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	1,045	964
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Corporate debt securities [Member]
Assets:
Balance, beginning of period	407	432
Net gains (losses) included in net income	1	(14)
Net gains (losses) included in other comprehensive income	3	8
Purchases, sales, issuances and settlements, net	(1)	(35)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	410	391
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Asset-backed securities [Member]
Assets:
Balance, beginning of period	566	962
Net gains (losses) included in net income	8	0
Net gains (losses) included in other comprehensive income	(7)	2
Purchases, sales, issuances and settlements, net	(66)	(119)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	501	845
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Auto loans and leases [Member]
Assets:
Balance, beginning of period	0	0
Net gains (losses) included in net income	0	0
Net gains (losses) included in other comprehensive income	0	0
Purchases, sales, issuances and settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	0
Available-for-sale securities [Member] | Other asset-backed securities [Member]
Assets:
Balance, beginning of period	566	962
Net gains (losses) included in net income	8	0
Net gains (losses) included in other comprehensive income	(7)	2
Purchases, sales, issuances and settlements, net	(66)	(119)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	501	845
Net unrealized gains (losses) included in income related to assets and liabilities held at period end	0	$ 0
Auction Rate Securities [Member] | Accounting Standards Update 2016-01 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Accounting Pronouncement, Reclassification Change in Beginning Balance	$ 382

Fair Value, Assets and Liabi125

Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation Breakout (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trading assets [Member]
Assets:
Purchases	$ 186	$ 206
Sales	(192)	(82)
Issuances	0	0
Settlements	(31)	(38)
Net	(37)	86
Trading assets [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	0	1
Sales	0	(1)
Issuances	0	0
Settlements	0	0
Net	0	0
Trading assets [Member] | Mortgage-Backed Securities [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Trading assets [Member] | Collateralized Loan Obligations [Member]
Assets:
Purchases	182	199
Sales	(191)	(76)
Issuances	0	0
Settlements	(31)	(38)
Net	(40)	85
Trading assets [Member] | Corporate debt securities [Member]
Assets:
Purchases	4	6
Sales	(1)	(5)
Issuances	0	0
Settlements	0	0
Net	3	1
Trading assets [Member] | Asset-backed securities [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Trading assets [Member] | Other Trading Debt Securities [Domain]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Available-for-sale securities [Member] | Debt securities [Member]
Assets:
Purchases	0	76
Sales	(12)	0
Issuances	59	367
Settlements	(186)	(276)
Net	(139)	167
Available-for-sale securities [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	0	0
Sales	(4)	0
Issuances	10	346
Settlements	(47)	(61)
Net	(41)	285
Available-for-sale securities [Member] | Mortgage-Backed Securities [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(8)	(3)
Net	(8)	(3)
Available-for-sale securities [Member] | Residential [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Available-for-sale securities [Member] | Commercial [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(8)	(3)
Net	(8)	(3)
Available-for-sale securities [Member] | Collateralized Loan Obligations [Member]
Assets:
Purchases	0	72
Sales	0	0
Issuances	0	0
Settlements	(23)	(33)
Net	(23)	39
Available-for-sale securities [Member] | Corporate debt securities [Member]
Assets:
Purchases	0	4
Sales	0	0
Issuances	0	0
Settlements	(1)	(39)
Net	(1)	(35)
Available-for-sale securities [Member] | Asset-backed securities [Member]
Assets:
Purchases	0	0
Sales	(8)	0
Issuances	49	21
Settlements	(107)	(140)
Net	(66)	(119)
Available-for-sale securities [Member] | Auto loans and leases [Member]
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Available-for-sale securities [Member] | Other asset-backed securities [Member]
Assets:
Purchases	0	0
Sales	(8)	0
Issuances	49	21
Settlements	(107)	(140)
Net	(66)	(119)
Mortgages held for sale [Member]
Assets:
Purchases	27	22
Sales	(83)	(156)
Issuances	58	106
Settlements	(39)	(32)
Net	(37)	(60)
Loans held for sale [Member]
Assets:
Purchases	0	0
Sales	(16)	0
Issuances	0	0
Settlements	0	0
Net	(16)	0
Loans [Member]
Assets:
Purchases	1	1
Sales	0	(129)
Issuances	4	6
Settlements	(28)	(125)
Net	(23)	(247)
Mortgage servicing rights [Member]
Assets:
Purchases	0	0
Sales	(4)	(47)
Issuances	573	583
Settlements	0	0
Net	569	536
Derivative [Member]
Assets and Liabilities:
Purchases	3	2
Sales	(2)	(1)
Issuances	0	0
Settlements	310	(79)
Net	311	(78)
Derivative [Member] | Interest rate contract [Member]
Assets and Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	266	(112)
Net	266	(112)
Derivative [Member] | Commodity contract [Member]
Assets and Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(24)	(6)
Net	(24)	(6)
Derivative [Member] | Equity contract [Member]
Assets and Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	71	37
Net	71	37
Derivative [Member] | Foreign exchange contract [Member]
Assets and Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	1	0
Net	1	0
Derivative [Member] | Credit contract [Member]
Assets and Liabilities:
Purchases	3	2
Sales	(2)	(1)
Issuances	0	0
Settlements	(4)	2
Net	(3)	3
Derivative [Member] | Other contract [Member]
Assets and Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Equity Securities
Assets:
Purchases	0	0
Sales	(17)	0
Issuances	0	0
Settlements	(79)	0
Net	(96)	0
Equity Securities | Marketable Equity Securities
Assets:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Equity Securities | Nonmarketable Equity Securities
Assets:
Purchases	0	0
Sales	(17)	0
Issuances	0	0
Settlements	(79)	0
Net	(96)	0
Short sale liabilities [Member]
Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	0	0
Other liabilities [Member]
Liabilities:
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Net	$ 0	$ 0

Fair Value, Assets and Liabi126

Fair Value, Assets and Liabilities Measured on a Recurring Basis Level 3 Valuation Techniques and Significant Unobservable Inputs (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)$ / loan	Dec. 31, 2017USD ($)$ / loan
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Available-for-sale debt securities	$ 271,656	$ 276,407	[1]
Mortgages held for sale, carried at fair value	13,859	16,116
Loans	352	376
Mortgage servicing rights	15,041	13,625
Fair Value Inputs [Abstract]
Fair value derivative assets	36,334	36,355
Aggregate Fair Value Of Derivative Loan Commitments Net Asset (Liability)	37	17
Fair value derivative liabilities	$ 32,672	$ 34,298
Derivative Loan Commitments [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Fall-out factor	1.00%	1.00%
Initial-value servicing (in bps)	(0.525%)	(0.599%)
Derivative Loan Commitments [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Fall-out factor	99.00%	99.00%
Initial-value servicing (in bps)	1.22%	1.011%
Derivative Loan Commitments [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Fall-out factor	19.30%	15.20%
Initial-value servicing (in bps)	0.236%	0.027%
Interest rate contract [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Prepayment rate	2.80%	2.80%
Loss severity	50.00%	50.00%
Default rate	0.10%	0.00%
Interest rate contract [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Prepayment rate	12.50%	12.50%
Loss severity	50.00%	50.00%
Default rate	5.00%	5.00%
Interest rate contract [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Prepayment rate	10.20%	10.50%
Loss severity	50.00%	50.00%
Default rate	2.10%	2.10%
Equity contract [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Weighted average life	1 year 3 months	6 months
Conversion factor	(9.60%)	(9.70%)
Equity contract [Member] | Minimum [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Volatility factor	6.50%	5.70%
Correlation factor	(77.00%)	(77.00%)
Equity contract [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Weighted average life	2 years 9 months	3 years
Conversion factor	0.00%	0.00%
Equity contract [Member] | Maximum [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Volatility factor	100.00%	95.50%
Correlation factor	99.00%	98.00%
Equity contract [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Weighted average life	2 years	1 year 7 months
Conversion factor	(8.90%)	(7.60%)
Equity contract [Member] | Weighted Average [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Volatility factor	24.90%	19.20%
Correlation factor	27.50%	24.20%
Credit contract [Member] | Minimum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(24.30%)	(29.90%)
Credit contract [Member] | Minimum [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Loss severity	13.00%	13.00%
Credit spread	0.00%	0.00%
Credit contract [Member] | Maximum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	28.80%	17.30%
Credit contract [Member] | Maximum [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Loss severity	60.00%	60.00%
Credit spread	9.20%	63.70%
Credit contract [Member] | Weighted Average [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	0.00%	(0.20%)
Credit contract [Member] | Weighted Average [Member] | Option model [Member]
Fair Value Inputs [Abstract]
Loss severity	48.50%	50.70%
Credit spread	0.60%	1.30%
Collateralized Loan Obligations [Member] | Minimum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(17.00%)	(22.00%)
Collateralized Loan Obligations [Member] | Maximum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	21.00%	19.50%
Collateralized Loan Obligations [Member] | Weighted Average [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	2.60%	3.00%
Municipal Bonds [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.80%	4.70%
Municipal Bonds [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.90%	4.90%
Municipal Bonds [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.90%	4.80%
Government, healthcare and other revenue bonds [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	1.80%	1.70%
Government, healthcare and other revenue bonds [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	6.10%	5.80%
Government, healthcare and other revenue bonds [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	2.90%	2.70%
ERROR in label resolution. | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Volatility factor	0.70%	0.50%
ERROR in label resolution. | Minimum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(20.20%)	(21.10%)
ERROR in label resolution. | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Volatility factor	2.50%	1.90%
ERROR in label resolution. | Maximum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(4.80%)	(5.50%)
ERROR in label resolution. | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Volatility factor	1.90%	1.40%
ERROR in label resolution. | Weighted Average [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(17.20%)	(15.00%)
Diversified payment rights [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	2.80%	2.40%
Diversified payment rights [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.40%	3.90%
Diversified payment rights [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	3.60%	3.10%
Other commercial and consumer [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	3.90%	3.70%
Weighted average life	1 year 9 months	2 years
Other commercial and consumer [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	5.40%	5.20%
Weighted average life	2 years 1 month	2 years 4 months
Other commercial and consumer [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.20%	3.90%
Weighted average life	1 year 11 months	2 years 1 month
Mortgages held for sale [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	1.10%	2.60%
Prepayment rate	3.00%	6.50%
Loss severity	0.00%	0.10%
Default rate	0.00%	0.00%
Mortgages held for sale [Member] | Minimum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(56.30%)	(56.30%)
Mortgages held for sale [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	6.90%	7.30%
Prepayment rate	12.60%	15.90%
Loss severity	47.60%	41.40%
Default rate	8.20%	7.10%
Mortgages held for sale [Member] | Maximum [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(6.30%)	(6.30%)
Mortgages held for sale [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	5.60%	5.60%
Prepayment rate	4.90%	9.10%
Loss severity	26.40%	19.60%
Default rate	1.10%	1.30%
Mortgages held for sale [Member] | Weighted Average [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(44.00%)	(42.70%)
Loans [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	3.10%	3.10%
Prepayment rate	4.40%	8.70%
Loss severity	0.00%	0.00%
Loans [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	7.00%	7.50%
Prepayment rate	100.00%	100.00%
Loss severity	33.80%	33.90%
Loans [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	4.20%	4.20%
Prepayment rate	91.20%	91.90%
Loss severity	7.50%	6.60%
Residential mortgage servicing rights [Member] | Minimum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	7.00%	6.60%
Prepayment rate	8.20%	9.70%
Cost to service per loan | $ / loan	77	78
Residential mortgage servicing rights [Member] | Maximum [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	13.30%	12.90%
Prepayment rate	20.30%	20.50%
Cost to service per loan | $ / loan	569	587
Residential mortgage servicing rights [Member] | Weighted Average [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Discount rate	7.20%	6.90%
Prepayment rate	9.30%	10.50%
Cost to service per loan | $ / loan	136	143
Recurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ (31,188)	$ (27,271)
Mortgages held for sale, carried at fair value	13,859	16,116
Loans	352	376
Mortgage servicing rights	15,041	13,625
Recurring [Member] | Interest rate contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	16,847	17,630
Fair value derivative liabilities	15,995	15,472
Recurring [Member] | Equity contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	7,823	7,007
Fair value derivative liabilities	7,777	8,501
Recurring [Member] | Credit contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	351	391
Fair value derivative liabilities	356	422
Fair Value, Inputs, Level 3 [Member] | Recurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(2,007)	(2,022)
Mortgages held for sale, carried at fair value	950	998
Loans	352	376
Mortgage servicing rights	15,041	13,625
Total insignificant level 3 assets, net of liabilities	539	570
Total level 3 assets, net of liabilities	24,294	22,854
Fair Value Inputs [Abstract]
Assets, Fair Value Disclosure	26,301	24,876
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity Securities	9	8
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Market comparable pricing [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity Securities	4,917	4,813
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Vendor priced [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity Securities	293
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Derivative Loan Commitments [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	37	17
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Interest rate contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	99	134
Fair value derivative liabilities	107	63
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Interest rate contract [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	(45)	54
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Equity contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	1,466	1,339
Fair value derivative liabilities	1,788	1,850
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Equity contract [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	120	102
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Equity contract [Member] | Option model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	(442)	(613)
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Credit contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	120	122
Fair value derivative liabilities	79	86
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Credit contract [Member] | Market comparable pricing [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	(3)	(3)
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Credit contract [Member] | Option model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net derivative assets and liabilities	44	39
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Collateralized Loan Obligations [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	316	354
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Collateralized Loan Obligations [Member] | Vendor priced [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	1,045	1,020
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Municipal Bonds [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	11	11
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Municipal Bonds [Member] | Vendor priced [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	44	49
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Government, healthcare and other revenue bonds [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	565	868
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Diversified payment rights [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	253	292
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Other commercial and consumer [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	221	248
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Other commercial and consumer [Member] | Vendor priced [Member]
Fair Value Inputs [Abstract]
Trading and Available for Sale Securities, Fair Value Disclosure	27	26
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale, carried at fair value	930	974
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Mortgages held for sale [Member] | Market comparable pricing [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale, carried at fair value	20	24
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Loans [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Loans	352	376
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Residential mortgage servicing rights [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgage servicing rights	15,041	13,625
Fair Value, Inputs, Level 2 [Member] | Recurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(35,840)	(36,814)
Mortgages held for sale, carried at fair value	12,909	15,118
Loans	0	0
Mortgage servicing rights	0	0
Fair Value Inputs [Abstract]
Assets, Fair Value Disclosure	359,659	364,276
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Interest rate contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	16,728	17,479
Fair value derivative liabilities	15,868	15,392
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Equity contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	4,562	3,970
Fair value derivative liabilities	4,598	5,338
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Credit contract [Member]
Fair Value Inputs [Abstract]
Fair value derivative assets	231	269
Fair value derivative liabilities	$ 277	$ 336
Non modified loans [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Cost to service per loan | $ / loan	77	78
Non modified loans [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Cost to service per loan | $ / loan	246	252
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Fair Value, Assets Recorded at

Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	$ 13,859	$ 16,116
Loans held for sale	1,695	1,023
Loans	352	376
Other assets	85,888	90,244	[1]
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	2,891	2,979
Loans held for sale	1,799	108
Loans	351	886
Nonmarketable Equity Securities	484	136
Other assets	158	338
Assets, Fair Value Disclosure	5,683	4,447
Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	218	374
Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	133	512
Level 1 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	0	0
Loans held for sale	0	0
Loans	0	0
Nonmarketable Equity Securities	0	0
Other assets	0	0
Assets, Fair Value Disclosure	0	0
Level 1 [Member] | Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 [Member] | Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	1,606	1,646
Loans held for sale	1,799	108
Loans	348	876
Nonmarketable Equity Securities	356	0
Other assets	146	177
Assets, Fair Value Disclosure	4,255	2,807
Level 2 [Member] | Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	218	374
Level 2 [Member] | Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	130	502
Level 3 [Member] | Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	1,285	1,333
Loans held for sale	0	0
Loans	3	10
Nonmarketable Equity Securities	128	136
Other assets	12	161
Assets, Fair Value Disclosure	1,428	1,640
Level 3 [Member] | Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 3 [Member] | Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 3	$ 10
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Fair Value, Changes in Fair Val

Fair Value, Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Mortgages held for sale (LOCOM)	$ 7	$ 21
Loans held for sale	(82)	0
Loans	(188)	(302)
Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis, Nonmarketable Equity Securities	208	(60)
Other assets	(22)	(40)
Total	(77)	(381)
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(81)	(127)
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (107)	$ (175)

Fair Value, Assets Recorded 129

Fair Value, Assets Recorded at Fair Value on a Nonrecurring Basis Level 3 Valuation Techniques and Significant Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	$ 13,859	$ 16,116
Minimum [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	0.00%	0.00%
Discount rate	1.10%	2.60%
Loss severity	0.00%	0.10%
Prepayment rate	3.00%	6.50%
Minimum [Member] | Mortgages held for sale [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(56.30%)	(56.30%)
Maximum [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	8.20%	7.10%
Discount rate	6.90%	7.30%
Loss severity	47.60%	41.40%
Prepayment rate	12.60%	15.90%
Maximum [Member] | Mortgages held for sale [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(6.30%)	(6.30%)
Weighted Average [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	1.10%	1.30%
Discount rate	5.60%	5.60%
Loss severity	26.40%	19.60%
Prepayment rate	4.90%	9.10%
Weighted Average [Member] | Mortgages held for sale [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Comparability adjustment	(44.00%)	(42.70%)
Fair Value, Measurements, Recurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	$ 13,859	$ 16,116
Fair Value Inputs [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(31,188)	(27,271)
Nonrecurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	2,891	2,979
Total assets recorded at fair value	5,683	4,447
Fair Value Inputs [Abstract]
Nonmarketable Equity Securities	$ 484	$ 136
Nonrecurring [Member] | Minimum [Member] | Discounted cash flow [Member] | Nonmarketable Equity Securities
Fair Value Inputs [Abstract]
Discount rate	10.50%	5.00%
Nonrecurring [Member] | Minimum [Member] | Residential [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	0.20%	0.10%
Discount rate	1.50%	1.50%
Loss severity	0.70%	0.70%
Prepayment rate	4.40%	5.40%
Nonrecurring [Member] | Maximum [Member] | Discounted cash flow [Member] | Nonmarketable Equity Securities
Fair Value Inputs [Abstract]
Discount rate	10.50%	10.50%
Nonrecurring [Member] | Maximum [Member] | Residential [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	3.40%	4.10%
Discount rate	8.50%	8.50%
Loss severity	50.50%	52.90%
Prepayment rate	100.00%	100.00%
Nonrecurring [Member] | Weighted Average [Member] | Discounted cash flow [Member] | Nonmarketable Equity Securities
Fair Value Inputs [Abstract]
Discount rate	10.50%	10.20%
Nonrecurring [Member] | Weighted Average [Member] | Residential [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Default rate	1.70%	1.70%
Discount rate	3.80%	3.80%
Loss severity	2.20%	2.20%
Prepayment rate	49.00%	50.60%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	$ 950	$ 998
Total assets recorded at fair value	26,301	24,876
Fair Value Inputs [Abstract]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(2,007)	(2,022)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Nonmarketable Equity Securities	9	8
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Market comparable pricing [Member]
Fair Value Inputs [Abstract]
Nonmarketable Equity Securities	4,917	4,813
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages held for sale [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	930	974
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages held for sale [Member] | Market comparable pricing [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	20	24
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	1,285	1,333
Insignificant level 3 assets	126	185
Total assets recorded at fair value	1,428	1,640
Fair Value Inputs [Abstract]
Nonmarketable Equity Securities	128	136
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member] | Discounted cash flow [Member]
Fair Value Inputs [Abstract]
Nonmarketable Equity Securities	17	122
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member] | Residential [Member] | Discounted cash flow [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	1,285	1,333
Government Insured Or Guaranteed [Member] | Residential [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	1,300	1,300
Non Government Insured Or Guaranteed [Member] | Residential [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortgages held for sale	$ 26	$ 26

Fair Value, Option, Carrying Am

Fair Value, Option, Carrying Amount (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgages held for sale	$ 13,859		$ 16,116
Loans held for sale	1,695		1,023
Loans	352		376
Equity Securities	58,935		62,497
Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgages held for sale	13,859		16,116
Mortgages held for sale, unpaid principal	13,762		15,827
Loans, Loans held for sale and Mortgages held for sale, aggregate difference	97		289
Nonaccrual loans	128		127
Nonaccrual loans, unpaid principal	168		165
Nonaccrual loans, Aggregate difference	(40)		(38)
Loans 90 days or more past due and still accruing	9		16
Loans 90 days or more past due and still accruing, Unpaid principal	13		21
Loans 90 days or more past due and still accruing, Aggregate difference	(4)		(5)
Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale	1,695		1,023
Loans held for sale, unpaid principal	1,749		1,075
Loans, Loans held for sale and Mortgages held for sale, aggregate difference	(54)		(52)
Nonaccrual loans	29		34
Nonaccrual loans, unpaid principal	53		56
Nonaccrual loans, Aggregate difference	(24)		(22)
Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans	352		376
Loans, Unpaid principal	382		404
Loans, Loans held for sale and Mortgages held for sale, aggregate difference	(30)		(28)
Nonaccrual loans	244		253
Nonaccrual loans, unpaid principal	274		281
Nonaccrual loans, Aggregate difference	(30)		(28)
Equity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Equity Securities	4,975		$ 4,867
Net gains losses from trading activities [Member] | Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0	$ 0
Net gains losses from trading activities [Member] | Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	6	25
Net gains losses from trading activities [Member] | Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0	0
Net gains losses from trading activities [Member] | Equity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 0	$ 0

Fair Value, Option, Gains and L

Fair Value, Option, Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	$ 7	$ 24
Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	1	(1)
Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	6	25
Mortgage banking noninterest income [Member] | Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	(59)	279
Mortgage banking noninterest income [Member] | Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Mortgage banking noninterest income [Member] | Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Mortgage banking noninterest income [Member] | Equity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Mortgage banking noninterest income [Member] | Other interests held [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Net gains (losses) from trading activities [Member] | Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Net gains (losses) from trading activities [Member] | Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	6	25
Net gains (losses) from trading activities [Member] | Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Net gains (losses) from trading activities [Member] | Equity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Net gains (losses) from trading activities [Member] | Other interests held [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	(1)	(2)
Other noninterest income [Member] | Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Other noninterest income [Member] | Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	0	0
Other noninterest income [Member] | Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	(1)	0
Other noninterest income [Member] | Equity Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	101	490
Other noninterest income [Member] | Other interests held [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) on changes in fair value	$ 0	$ 0

Fair Value, Option, Instrument

Fair Value, Option, Instrument Specific Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (losses) attributable to instrument-specific credit risk	$ 7	$ 24
Mortgages held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (losses) attributable to instrument-specific credit risk	1	(1)
Loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (losses) attributable to instrument-specific credit risk	$ 6	$ 25

Fair Value, Estimates for Finan

Fair Value, Estimates for Financial Instruments Excluding those Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Financial assets
Cash and due from banks		$ 18,145	$ 23,367
Held-to-maturity debt securities		141,446	139,335
Loans	[1]	947,308	956,770
Financial liabilities
Deposits		1,303,689	1,335,991
Short-term borrowings		97,207	103,256
Long-term debt		227,302	225,020
Nonmarketable Equity Securities, Cost Basis		1,300
Deposit Liabilities With No Defined or Contractual Maturity		1,200,000	1,200,000
Capital Lease Obligations		38	39
Carrying value [Member]
Financial assets
Cash and due from banks		18,145	23,367
Interest-earning deposits with banks		184,250	192,580
Federal funds sold and securities purchased under resale agreements		73,550	80,025
Held-to-maturity debt securities		141,446	139,335
Mortgages held for sale		4,085	3,954
Loans held for sale		1,886	108
Loans		917,574	926,273
Nonmarketable Equity Securities		5,780	7,136
Assets		1,346,716	1,372,778
Financial liabilities
Deposits		118,666	128,594
Short-term borrowings		97,207	103,256
Long-term debt		227,264	224,981
Financial Liabilities Fair Value Disclosure		443,137	456,831
Estimated fair value [Member]
Financial assets
Cash and due from banks		18,145	23,367
Interest-earning deposits with banks		184,250	192,580
Federal funds sold and securities purchased under resale agreements		73,550	80,025
Held-to-maturity debt securities		138,323	138,985
Mortgages held for sale		4,093	3,958
Loans held for sale		1,887	108
Loans		921,370	938,335
Nonmarketable Equity Securities		5,803	7,628
Assets		1,347,421	1,384,986
Financial liabilities
Deposits		118,579	127,914
Short-term borrowings		97,204	103,256
Long-term debt		230,260	230,268
Financial Liabilities Fair Value Disclosure		446,043	461,438
Loan Commitments And Standby, Commercial And Similar Letters of Credit		1,000	1,000
Estimated fair value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks		18,145	23,367
Interest-earning deposits with banks		184,091	192,455
Federal funds sold and securities purchased under resale agreements		0	1,002
Held-to-maturity debt securities		44,179	44,806
Mortgages held for sale		0	0
Loans held for sale		0	0
Loans		0	0
Nonmarketable Equity Securities		0	0
Assets		246,415	261,630
Financial liabilities
Deposits		0	0
Short-term borrowings		0	0
Long-term debt		0	0
Financial Liabilities Fair Value Disclosure		0	0
Estimated fair value [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks		0	0
Interest-earning deposits with banks		159	125
Federal funds sold and securities purchased under resale agreements		73,550	78,954
Held-to-maturity debt securities		93,650	93,694
Mortgages held for sale		2,808	2,625
Loans held for sale		1,887	108
Loans		49,806	51,713
Nonmarketable Equity Securities		0	23
Assets		221,860	227,242
Financial liabilities
Deposits		98,649	108,146
Short-term borrowings		97,204	103,256
Long-term debt		228,231	227,109
Financial Liabilities Fair Value Disclosure		424,084	438,511
Estimated fair value [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and due from banks		0	0
Interest-earning deposits with banks		0	0
Federal funds sold and securities purchased under resale agreements		0	69
Held-to-maturity debt securities		494	485
Mortgages held for sale		1,285	1,333
Loans held for sale		0	0
Loans		871,564	886,622
Nonmarketable Equity Securities		5,803	7,605
Assets		879,146	896,114
Financial liabilities
Deposits		19,930	19,768
Short-term borrowings		0	0
Long-term debt		2,029	3,159
Financial Liabilities Fair Value Disclosure		21,959	22,927
Finance Leases Financing Receivable [Member]
Financial assets
Loans		19,300	19,400
Nonmarketable Equity Securities
Financial liabilities
Alternative Investment, Fair Value Disclosure		$ 27	$ 30
[1]	(3)Parenthetical amounts represent assets and liabilities for which we are required to carry at fair value or have elected the fair value option.

Preferred Stock (Details)

Preferred Stock (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)vote$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares
Detail of Preferred Stock [Abstract]
Preferred Stock, Shares authorized and designated | shares	12,905,414	12,036,414
ESOP, Liquidation preference per share | $ / shares	$ 0	$ 0
ESOP, Shares authorized and designated | shares	2,425,104	1,556,104
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	12,546,235	11,677,235
Voting Rights	If issued, preference shares would be limited to one vote per share
Preferred Stock, Liquidation Preference, Value	$ 27,626	$ 26,757
Carrying value	26,227	25,358
Discount	$ 1,399	$ 1,399
ESOP Shares issued and outstanding | shares	2,425,104	1,556,104
ESOP Liquidation preference value	$ 2,425	$ 1,556
ESOP Carrying value	2,425	1,556
ESOP Discount	$ 0	$ 0
Preferred Stock, No Voting Rights [Member]
Class of Stock [Line Items]
Preferred shares authorized | shares	20,000,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Par or Stated Value	$ 0
Preferred Stock, Voting Rights [Member]
Class of Stock [Line Items]
Preferred shares authorized | shares	4,000,000
Number of votes per share | vote	1
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	0
Preferred Stock, Par or Stated Value	$ 0
Dividend Equalization Preferred Shares (DEP) [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 10	$ 10
Preferred Stock, Shares authorized and designated | shares	97,000	97,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	96,546	96,546
Preferred Stock, Liquidation Preference, Value	$ 0	$ 0
Carrying value	0	0
Discount	$ 0	$ 0
Series I - Floating Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 100,000	$ 100,000
Preferred Stock, Shares authorized and designated | shares	25,010	25,010
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	25,010	25,010
Preferred Stock, Liquidation Preference, Value	$ 2,501	$ 2,501
Carrying value	2,501	2,501
Discount	$ 0	$ 0
Series J - 8.00% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	8.00%	8.00%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Preferred Stock, Shares authorized and designated | shares	2,300,000	2,300,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	2,150,375	2,150,375
Preferred Stock, Liquidation Preference, Value	$ 2,150	$ 2,150
Carrying value	1,995	1,995
Discount	$ 155	$ 155
Series K - 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	7.98%	7.98%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Preferred Stock, Shares authorized and designated | shares	3,500,000	3,500,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	3,352,000	3,352,000
Preferred Stock, Liquidation Preference, Value	$ 3,352	$ 3,352
Carrying value	2,876	2,876
Discount	$ 476	$ 476
Series L - 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	7.50%	7.50%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000
Preferred Stock, Shares authorized and designated | shares	4,025,000	4,025,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	3,968,000	3,968,000
Preferred Stock, Liquidation Preference, Value	$ 3,968	$ 3,968
Carrying value	3,200	3,200
Discount	$ 768	$ 768
Series N - 5.20% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.20%	5.20%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	30,000	30,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	30,000	30,000
Preferred Stock, Liquidation Preference, Value	$ 750	$ 750
Carrying value	750	750
Discount	$ 0	$ 0
Series O - 5.125% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.125%	5.125%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	27,600	27,600
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	26,000	26,000
Preferred Stock, Liquidation Preference, Value	$ 650	$ 650
Carrying value	650	650
Discount	$ 0	$ 0
Series P - 5.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.25%	5.25%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	26,400	26,400
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	25,000	25,000
Preferred Stock, Liquidation Preference, Value	$ 625	$ 625
Carrying value	625	625
Discount	$ 0	$ 0
Series Q - 5.85% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.85%	5.85%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	69,000	69,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	69,000	69,000
Preferred Stock, Liquidation Preference, Value	$ 1,725	$ 1,725
Carrying value	1,725	1,725
Discount	$ 0	$ 0
Series R - 6.625% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	6.625%	6.625%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	34,500	34,500
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	33,600	33,600
Preferred Stock, Liquidation Preference, Value	$ 840	$ 840
Carrying value	840	840
Discount	$ 0	$ 0
Series S - 5.900% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.90%	5.90%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	80,000	80,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	80,000	80,000
Preferred Stock, Liquidation Preference, Value	$ 2,000	$ 2,000
Carrying value	2,000	2,000
Discount	$ 0	$ 0
Series T - 6.000% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	6.00%	6.00%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	32,200	32,200
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	32,000	32,000
Preferred Stock, Liquidation Preference, Value	$ 800	$ 800
Carrying value	800	800
Discount	$ 0	$ 0
Series U - 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.875%	5.875%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	80,000	80,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	80,000	80,000
Preferred Stock, Liquidation Preference, Value	$ 2,000	$ 2,000
Carrying value	2,000	2,000
Discount	$ 0	$ 0
Series V - 6.000% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	6.00%	6.00%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	40,000	40,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	40,000	40,000
Preferred Stock, Liquidation Preference, Value	$ 1,000	$ 1,000
Carrying value	1,000	1,000
Discount	$ 0	$ 0
Series W - 5.700% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.70%	5.70%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	40,000	40,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	40,000	40,000
Preferred Stock, Liquidation Preference, Value	$ 1,000	$ 1,000
Carrying value	1,000	1,000
Discount	$ 0	$ 0
Series X - 5.500% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.50%	5.50%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	46,000	46,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	46,000	46,000
Preferred Stock, Liquidation Preference, Value	$ 1,150	$ 1,150
Carrying value	1,150	1,150
Discount	$ 0	$ 0
Series Y - 5.625% Non-Cumulative Perpetual Class A Preferred Stock [Member]
Detail of Preferred Stock [Abstract]
Preferred Stock, Dividend rate (percent)	5.625%	5.625%
Preferred Stock, Liquidation preference per share (in dollars per share) | $ / shares	$ 25,000	$ 25,000
Preferred Stock, Shares authorized and designated | shares	27,600	27,600
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued and outstanding | shares	27,600	27,600
Preferred Stock, Liquidation Preference, Value	$ 690	$ 690
Carrying value	690	690
Discount	$ 0	$ 0

ESOP Preferred Stock (Details)

ESOP Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Additional paid-in capital included related to preferred stock	$ 146	$ 122
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	2,425,104	1,556,104
Carrying value	$ 2,425	$ 1,556
Unearned ESOP shares	$ (2,571)	$ (1,678)
Employee Stock Ownership Plan Preferred Stock 2018 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	1,100,000	0
Carrying value	$ 1,100	$ 0
Employee Stock Ownership Plan Preferred Stock 2018 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	7.00%
Employee Stock Ownership Plan Preferred Stock 2018 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	8.00%
Employee Stock Ownership Plan Preferred Stock 2017 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	249,210	273,210
Carrying value	$ 249	$ 273
Employee Stock Ownership Plan Preferred Stock 2017 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	7.00%	7.00%
Employee Stock Ownership Plan Preferred Stock 2017 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	8.00%	8.00%
Employee Stock Ownership Plan Preferred Stock 2016 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	268,826	322,826
Carrying value	$ 269	$ 323
Employee Stock Ownership Plan Preferred Stock 2016 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.30%	9.30%
Employee Stock Ownership Plan Preferred Stock 2016 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	10.30%	10.30%
Employee Stock Ownership Plan Preferred Stock 2015 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	167,436	187,436
Carrying value	$ 167	$ 187
Employee Stock Ownership Plan Preferred Stock 2015 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	8.90%	8.90%
Employee Stock Ownership Plan Preferred Stock 2015 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.90%	9.90%
Employee Stock Ownership Plan Preferred Stock 2014 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	212,151	237,151
Carrying value	$ 212	$ 237
Employee Stock Ownership Plan Preferred Stock 2014 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	8.70%	8.70%
Employee Stock Ownership Plan Preferred Stock 2014 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.70%	9.70%
Employee Stock Ownership Plan Preferred Stock 2013 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	169,948	201,948
Carrying value	$ 170	$ 202
Employee Stock Ownership Plan Preferred Stock 2013 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	8.50%	8.50%
Employee Stock Ownership Plan Preferred Stock 2013 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.50%	9.50%
Employee Stock Ownership Plan Preferred Stock 2012 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	105,634	128,634
Carrying value	$ 106	$ 129
Employee Stock Ownership Plan Preferred Stock 2012 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	10.00%	10.00%
Employee Stock Ownership Plan Preferred Stock 2012 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	11.00%	11.00%
Employee Stock Ownership Plan Preferred Stock 2011 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	99,296	129,296
Carrying value	$ 99	$ 129
Employee Stock Ownership Plan Preferred Stock 2011 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.00%	9.00%
Employee Stock Ownership Plan Preferred Stock 2011 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	10.00%	10.00%
Employee Stock Ownership Plan Preferred Stock 2010 [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Shares issued and outstanding	52,603	75,603
Carrying value	$ 53	$ 76
Employee Stock Ownership Plan Preferred Stock 2010 [Member] | Minimum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	9.50%	9.50%
Employee Stock Ownership Plan Preferred Stock 2010 [Member] | Maximum [Member]
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]
Adjustable dividend rate	10.50%	10.50%
Stock Compensation Plan [Member] | Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, redemption price per share	$ 1,000

Revenue from Contracts with 136

Revenue from Contracts with Customers, Revenue by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income	$ 12,238	$ 12,324	[1]
Service charges on deposit accounts	1,173	1,313
Brokerage advisory, commissions and other fees	2,403	2,324
Trust and investment management	850	829
Investment banking	430	417
Total trust and investment fees	3,683	3,570
Card fees	908	945
Other fees	800	865
Mortgage banking	934	1,228
Insurance	114	277
Net gains from trading activities (1)	243	272	[2]
Net gains on debt securities	1	36
Net gains from equity investments	783	570
Lease income	455	481
Other income of the segment (1)	602	374	[1]
Total noninterest income (2)	9,696	9,931	[1]
Revenue	21,934	22,255
Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income	7,195	7,132
Service charges on deposit accounts	639	742
Brokerage advisory, commissions and other fees	478	444
Trust and investment management	233	218
Investment banking	(10)	(27)
Total trust and investment fees	701	635
Card fees	821	865
Other fees	327	395
Mortgage banking	842	1,106
Insurance	28	34
Net gains from trading activities (1)	(1)	(52)
Net gains on debt securities	0	102
Net gains from equity investments	684	468
Lease income	0	0
Other income of the segment (1)	594	396
Total noninterest income (2)	4,635	4,691
Revenue	11,830	11,823
Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income	4,532	4,681
Service charges on deposit accounts	534	570
Brokerage advisory, commissions and other fees	67	84
Trust and investment management	113	129
Investment banking	440	445
Total trust and investment fees	620	658
Card fees	87	80
Other fees	472	468
Mortgage banking	93	123
Insurance	79	234
Net gains from trading activities (1)	225	290
Net gains on debt securities	1	(66)
Net gains from equity investments	93	36
Lease income	455	481
Other income of the segment (1)	88	22
Total noninterest income (2)	2,747	2,896
Revenue	7,279	7,577
Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income	1,112	1,141
Service charges on deposit accounts	4	5
Brokerage advisory, commissions and other fees	2,344	2,245
Trust and investment management	743	707
Investment banking	0	(1)
Total trust and investment fees	3,087	2,951
Card fees	1	1
Other fees	4	5
Mortgage banking	(3)	(2)
Insurance	18	20
Net gains from trading activities (1)	19	34
Net gains on debt securities	0	0
Net gains from equity investments	6	66
Lease income	0	0
Other income of the segment (1)	(6)	36
Total noninterest income (2)	3,130	3,116
Revenue	4,242	4,257
Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income	(601)	(630)
Service charges on deposit accounts	(4)	(4)
Brokerage advisory, commissions and other fees	(486)	(449)
Trust and investment management	(239)	(225)
Investment banking	0	0
Total trust and investment fees	(725)	(674)
Card fees	(1)	(1)
Other fees	(3)	(3)
Mortgage banking	2	1
Insurance	(11)	(11)
Net gains from trading activities (1)	0	0
Net gains on debt securities	0	0
Net gains from equity investments	0	0
Lease income	0	0
Other income of the segment (1)	(74)	(80)
Total noninterest income (2)	(816)	(772)
Revenue	(1,417)	(1,402)
Charges and fees on loans [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	301	307
Charges and fees on loans [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	74	84
Charges and fees on loans [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	227	223
Charges and fees on loans [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	1	1
Charges and fees on loans [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	(1)	(1)
Cash network fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	126	126
Cash network fees [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	125	123
Cash network fees [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	1	3
Cash network fees [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	0
Cash network fees [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	0
Commercial real estate brokerage commissions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	85	81
Commercial real estate brokerage commissions [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	0
Commercial real estate brokerage commissions [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	85	81
Commercial real estate brokerage commissions [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	0
Commercial real estate brokerage commissions [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	0
Letters of credit fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	79	74
Letters of credit fees [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	2	1
Letters of credit fees [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	77	73
Letters of credit fees [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	1	1
Letters of credit fees [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	(1)	(1)
Wire transfer and other remittance fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	116	107
Wire transfer and other remittance fees [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	63	57
Wire transfer and other remittance fees [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	52	49
Wire transfer and other remittance fees [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	2	2
Wire transfer and other remittance fees [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	(1)	(1)
All other fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	93	170
All other fees [Member] | Community Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	63	130
All other fees [Member] | Wholesale Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	30	39
All other fees [Member] | Wealth and Investment Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	0	1
All other fees [Member] | Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other fees	$ 0	$ 0
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[2]	(1)Financial information for the prior period has been revised to reflect the impact of the adoption of Accounting Standards Update (ASU) 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

Revenue from Contracts with 137

Revenue from Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	$ 1,173	$ 1,313
Brokerage advisory, commissions and other fees	2,403	2,324
Trust and investment management	850	829
Card fees	908	945
Credit card rewards and rebates	(343)	(277)
Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	414	486
Account charges
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	759	827
Asset-based revenue (1)
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	1,743	1,599
Transactional revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	444	484
Other revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	216	241
Trailing commissions
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	331	331
Investment management fees
Disaggregation of Revenue [Line Items]
Trust and investment management	534	501
Trust fees
Disaggregation of Revenue [Line Items]
Trust and investment management	256	280
Other revenue
Disaggregation of Revenue [Line Items]
Trust and investment management	60	48
Credit card interchange and network revenues (1)
Disaggregation of Revenue [Line Items]
Card fees	258	299
Debit card interchange and network revenues
Disaggregation of Revenue [Line Items]
Card fees	479	465
Late fees, cash advance fees, balance transfer fees, and annual fees
Disaggregation of Revenue [Line Items]
Card fees	171	181
Community Banking [Member]
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	639	742
Brokerage advisory, commissions and other fees	478	444
Trust and investment management	233	218
Card fees	821	865
Community Banking [Member] | Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	412	484
Community Banking [Member] | Account charges
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	227	258
Community Banking [Member] | Asset-based revenue (1)
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	371	326
Community Banking [Member] | Transactional revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	93	100
Community Banking [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	14	18
Community Banking [Member] | Investment management fees
Disaggregation of Revenue [Line Items]
Trust and investment management	0	1
Community Banking [Member] | Trust fees
Disaggregation of Revenue [Line Items]
Trust and investment management	221	217
Community Banking [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Trust and investment management	12	0
Community Banking [Member] | Credit card interchange and network revenues (1)
Disaggregation of Revenue [Line Items]
Card fees	171	219
Community Banking [Member] | Debit card interchange and network revenues
Disaggregation of Revenue [Line Items]
Card fees	479	465
Community Banking [Member] | Late fees, cash advance fees, balance transfer fees, and annual fees
Disaggregation of Revenue [Line Items]
Card fees	171	181
Wholesale Banking [Member]
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	534	570
Brokerage advisory, commissions and other fees	67	84
Trust and investment management	113	129
Card fees	87	80
Wholesale Banking [Member] | Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	2	2
Wholesale Banking [Member] | Account charges
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	532	568
Wholesale Banking [Member] | Asset-based revenue (1)
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	0	0
Wholesale Banking [Member] | Transactional revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	12	10
Wholesale Banking [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	55	74
Wholesale Banking [Member] | Investment management fees
Disaggregation of Revenue [Line Items]
Trust and investment management	0	0
Wholesale Banking [Member] | Trust fees
Disaggregation of Revenue [Line Items]
Trust and investment management	86	104
Wholesale Banking [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Trust and investment management	27	25
Wholesale Banking [Member] | Credit card interchange and network revenues (1)
Disaggregation of Revenue [Line Items]
Card fees	87	80
Wholesale Banking [Member] | Debit card interchange and network revenues
Disaggregation of Revenue [Line Items]
Card fees	0	0
Wholesale Banking [Member] | Late fees, cash advance fees, balance transfer fees, and annual fees
Disaggregation of Revenue [Line Items]
Card fees	0	0
Wealth and Investment Management [Member]
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	4	5
Brokerage advisory, commissions and other fees	2,344	2,245
Trust and investment management	743	707
Card fees	1	1
Wealth and Investment Management [Member] | Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	0	0
Wealth and Investment Management [Member] | Account charges
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	4	5
Wealth and Investment Management [Member] | Asset-based revenue (1)
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	1,743	1,599
Wealth and Investment Management [Member] | Transactional revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	439	479
Wealth and Investment Management [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	162	167
Wealth and Investment Management [Member] | Investment management fees
Disaggregation of Revenue [Line Items]
Trust and investment management	534	500
Wealth and Investment Management [Member] | Trust fees
Disaggregation of Revenue [Line Items]
Trust and investment management	188	184
Wealth and Investment Management [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Trust and investment management	21	23
Wealth and Investment Management [Member] | Credit card interchange and network revenues (1)
Disaggregation of Revenue [Line Items]
Card fees	1	1
Wealth and Investment Management [Member] | Debit card interchange and network revenues
Disaggregation of Revenue [Line Items]
Card fees	0	0
Wealth and Investment Management [Member] | Late fees, cash advance fees, balance transfer fees, and annual fees
Disaggregation of Revenue [Line Items]
Card fees	0	0
Other [Member]
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	(4)	(4)
Brokerage advisory, commissions and other fees	(486)	(449)
Trust and investment management	(239)	(225)
Card fees	(1)	(1)
Other [Member] | Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	0	0
Other [Member] | Account charges
Disaggregation of Revenue [Line Items]
Service charges on deposit accounts	(4)	(4)
Other [Member] | Asset-based revenue (1)
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	(371)	(326)
Other [Member] | Transactional revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	(100)	(105)
Other [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Brokerage advisory, commissions and other fees	(15)	(18)
Other [Member] | Investment management fees
Disaggregation of Revenue [Line Items]
Trust and investment management	0	0
Other [Member] | Trust fees
Disaggregation of Revenue [Line Items]
Trust and investment management	(239)	(225)
Other [Member] | Other revenue
Disaggregation of Revenue [Line Items]
Trust and investment management	0	0
Other [Member] | Credit card interchange and network revenues (1)
Disaggregation of Revenue [Line Items]
Card fees	(1)	(1)
Other [Member] | Debit card interchange and network revenues
Disaggregation of Revenue [Line Items]
Card fees	0	0
Other [Member] | Late fees, cash advance fees, balance transfer fees, and annual fees
Disaggregation of Revenue [Line Items]
Card fees	$ 0	$ 0

Employee Benefits, Components o

Employee Benefits, Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		111 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
Qualified Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	$ 1	$ 1
Interest cost	98	103
Expected return on plan assets	(160)	(163)
Amortization of net actuarial loss (gain)	33	38
Amortization of prior service credit	0	0
Settlement loss	0	1
Net periodic benefit cost (income)	(28)	(20)
Nonqualified Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0
Interest cost	5	6
Expected return on plan assets	0	0
Amortization of net actuarial loss (gain)	3	2
Amortization of prior service credit	0	0
Settlement loss	3	2
Net periodic benefit cost (income)	11	10
Other benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0
Interest cost	5	7
Expected return on plan assets	(7)	(7)
Amortization of net actuarial loss (gain)	(4)	(2)
Amortization of prior service credit	(3)	(3)
Settlement loss	0	0
Net periodic benefit cost (income)	$ (9)	$ (5)
Cash Balance Plan [Member]
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost (income)			$ 0

Earnings Per Common Share, Calc

Earnings Per Common Share, Calculation of Earnings and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Common Share [Abstract]
Wells Fargo net income (2)	$ 5,136	$ 5,634	[1],[2]
Less: Preferred stock dividends and other	403	401
Wells Fargo net income applicable to common stock (numerator)(1)	$ 4,733	$ 5,233	[1]
Earnings per common share
Average common shares outstanding (denominator)	4,885.7	5,008.6
Per share (1)	$ 0.97	$ 1.05	[1]
Diluted earnings per common share
Average common shares outstanding (in shares)	4,885.7	5,008.6
Diluted average common shares outstanding (denominator)	4,930.7	5,070.4
Per share (1)	$ 0.96	$ 1.03	[1]
Stock Option [Member]
Diluted earnings per common share
Weighted average number of diluted shares outstanding, adjustment (in shares)	9.9	21.2
Restricted Share Rights [Member]
Diluted earnings per common share
Weighted average number of diluted shares outstanding, adjustment (in shares)	28.3	28
Warrants [Member]
Diluted earnings per common share
Weighted average number of diluted shares outstanding, adjustment (in shares)	6.8	12.6
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

Earnings Per Common Share, Anti

Earnings Per Common Share, Antidilutive Securities Excluded from the Calculation of Diluted Earnings per Common Share (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Instruments	0.9	2.2

Other Comprehensive Income, Com

Other Comprehensive Income, Components of Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Debt securities (1):
Net unrealized gains (losses) arising during the period, Before tax	[1]	$ (3,443)	$ 369
Net unrealized gains (losses) arising during the period, Tax effect		848	(133)
Net unrealized gains (losses) arising during the period, Net of tax		(2,595)	236
Reclassification of net (gains) losses to net income, Before tax	[1]	68	(145)
Reclassification of net (gains) losses to net income, Tax effect		(17)	54
Reclassification of net (gains) losses to net income, Net of tax		51	(91)
Net change, Before tax		(3,375)	224
Net change, Tax effect		831	(79)
Net change, Net of tax		(2,544)	145
Cash Flow Hedges:
Net unrealized losses arising during the period on cash flow hedges, Before Tax		(242)	(362)	[2]
Net unrealized losses arising during the period on cash flow hedges, Net of tax		(182)	(226)
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax		60	(202)
Reclassification of net (gains) losses to net income on cash flow hedges, Net of tax		45	(126)
Net change, Before tax		(182)	(564)
Net change, Tax effect		45	212
Net change, Net of tax		(137)	(352)
Defined benefit plans adjustments:
Net actuarial and prior service gains (losses) arising during the period, Before tax		6	(7)
Net actuarial and prior service gains (losses) arising during the period, Tax effect		(2)	3
Net actuarial and prior service gains (losses) arising during the period, Net of tax		4	(4)
Amortization of net actuarial loss, Before tax		32	38
Amortization of net actuarial loss, Tax effect		(8)	(14)
Amortization of net actuarial loss, Net of tax		24	24
Settlements and other, Before tax		0	0
Settlements and other, Tax effect		1	0
Settlements and other, Net of tax		1	0
Reclassification of amounts to net periodic benefit costs, Before tax		32	38
Reclassification of amounts to net periodic benefit costs, Tax effect		(7)	(14)
Reclassification of amounts to net periodic benefit costs, Net of tax		25	24
Net change, Before tax		38	31
Net change, Tax effect		(9)	(11)
Net change, Net of tax		29	20
Foreign currency translation adjustments:
Net unrealized gains (losses) arising during the period, Before tax		(2)	16
Net unrealized gains (losses) arising during the period, Tax effect		(5)	1
Net unrealized gains (losses) arising during the period, Net of tax		(7)	17
Net change, Before tax		(2)	16
Net change, Tax effect		(5)	1
Net change, Net of tax		(7)	17
Other comprehensive loss, before tax		(3,521)	(293)	[2]
Other comprehensive loss, tax effect		862	123	[2]
Other comprehensive loss, net of tax		(2,659)	(170)	[2]
Less: Other comprehensive income from noncontrolling interests (2)		0	14	[2]
Wells Fargo other comprehensive loss, net of tax		(2,659)	(184)	[2]
Cash Flow Hedging [Member]
Cash Flow Hedges:
Net unrealized losses arising during the period on cash flow hedges, Before Tax		(266)	(136)
Net unrealized losses arising during the period on cash flow hedges, Tax		66	51
Net unrealized losses arising during the period on cash flow hedges, Net of tax		(200)	(85)
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax		60	(202)
Reclassification of net (gains) losses to net income on cash flow hedges, Tax effect		(15)	76
Reclassification of net (gains) losses to net income on cash flow hedges, Net of tax		45	(126)
Fair Value Hedging [Member]
Fair Value Hedges:
Change in fair value of excluded components on fair value hedges, Before Tax		24	(226)
Change in fair value of excluded components on fair value hedges, Tax		(6)	85
Change in fair value of excluded components on fair value hedges, Net of Tax		18	(141)
Interest expense on long-term debt [Member] | Cash Flow Hedging [Member]
Cash Flow Hedges:
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax		0	3
Reclassification of net (gains) losses to net income on cash flow hedges, Tax effect		0	(1)
Reclassification of net (gains) losses to net income on cash flow hedges, Net of tax		0	2
Debt securities [Member] | Interest income [Member]
Debt securities (1):
Reclassification of net (gains) losses to net income, Before tax		69	7
Reclassification of net (gains) losses to net income, Tax effect		(17)	(3)
Reclassification of net (gains) losses to net income, Net of tax		52	4
Debt securities [Member] | Net gains on debt securities [Member]
Debt securities (1):
Reclassification of net (gains) losses to net income, Before tax		(1)	(36)
Reclassification of net (gains) losses to net income, Tax effect		0	13
Reclassification of net (gains) losses to net income, Net of tax		(1)	(23)
Equity Securities | Net gains from equity securities [Member]
Debt securities (1):
Reclassification of net (gains) losses to net income, Before tax		0	(116)
Reclassification of net (gains) losses to net income, Tax effect		0	44
Reclassification of net (gains) losses to net income, Net of tax		0	(72)
Loans [Member] | Interest income [Member] | Cash Flow Hedging [Member]
Cash Flow Hedges:
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax		60	(205)
Reclassification of net (gains) losses to net income on cash flow hedges, Tax effect		(15)	77
Reclassification of net (gains) losses to net income on cash flow hedges, Net of tax		$ 45	$ (128)
[1]	(1)Per the adoption of ASU 2016-01, the quarter ended March 31, 2018, reflects only net unrealized gains and reclassification of net gains to net income from debt securities. The quarter ended March 31, 2017, includes net unrealized gains from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

Other Comprehensive Income, Cum

Other Comprehensive Income, Cumulative OCI Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017	Dec. 31, 2016
Components of Other Comprehensive Income [Line Items]
Net unrealized gains (losses) arising during the period, Before tax	[1]	$ (3,443)	$ 369
Reclassification of net (gains) losses to net income, Before tax	[1]	68	(145)
Debt securities (1):
Cumulative other comprehensive income (loss), debt securities, beginning of period		171	(1,099)
Net unrealized gains (losses) arising during the period		(2,595)	236
Amounts reclassified from accumulated other comprehensive income		51	(91)
Net change, Net of tax		(2,544)	145
Less: Other comprehensive income from noncontrolling interests		0	13
Cumulative other comprehensive income (loss), debt securities, end of period		(2,491)	(967)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities, Net of Tax, Adjusted Balance					$ 53	$ (1,099)
Derivatives and hedging activities:
Cumulative other comprehensive income (loss), Derivatives and hedging activities, beginning of period		(418)	89
Net unrealized losses arising during the period		(182)	(226)
Amounts reclassified from accumulated other comprehensive income		45	(126)
Net change, Net of tax		(137)	(352)
Less: Other comprehensive income from noncontrolling interests		0	0
Cumulative other comprehensive income (loss), Derivatives and hedging activities, end of period		(555)	(95)
Cumulative other comprehensive income, Derivatives and hedging activities, adjusted balance					(418)	257
Defined benefit plans adjustments:
Cumulative other comprehensive loss, Defined benefit plans adjustment, beginning of period		(1,808)	(1,943)
Net unrealized gains (losses) arising during the period		4	(4)
Amounts reclassified from accumulated other comprehensive income		25	24
Net change, Net of tax		29	20
Less: Other comprehensive income from noncontrolling interests		0	0
Cumulative other comprehensive loss, Defined benefit plans adjustment, end of period		(1,779)	(1,923)
Cumulative other comprehensive loss, Defined benefit plans adjustments, adjusted balance					(1,808)	(1,943)
Foreign currency translation adjustments:
Cumulative other comprehensive loss, Foreign currency translation adjustments, beginning of period		(89)	(184)
Net unrealized gains (losses) arising during the period		(7)	17
Amounts reclassified from accumulated other comprehensive income		0	0
Net change, Net of tax		(7)	17
Less: Other comprehensive income from noncontrolling interests		0	1
Cumulative other comprehensive loss, Foreign currency translation adjustments, end of period		(96)	(168)
Cumulative other comprehensive loss, Foreign currency translation adjustments, adjusted balance					(89)	(184)
Cumulative other comprehensive loss, beginning of period		(2,144)	(3,137)
Net unrealized gains (losses) arising during the period		(2,780)	23
Amounts reclassified from accumulated other comprehensive income		121	(193)
Other comprehensive loss, net of tax (2)		(2,659)	(170)	[2]
Less: Other comprehensive income from noncontrolling interests, net of tax		0	14	[2]
Cumulative other comprehensive loss, end of period		(4,921)	$ (3,153)
Cumulative other comprehensive income (loss), Adjusted Balance					(2,262)	(2,969)
Accounting Standards Update 2016-01 [Member]
Components of Other Comprehensive Income [Line Items]
Net unrealized gains (losses) arising during the period, Before tax		61
Reclassification of net (gains) losses to net income, Before tax		$ (116)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment	[3]				(24)
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment	[4]					(213)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment					(118)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment						168
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment	[3]				$ (118)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Transition Adjustment	[4]					$ 168
[1]	(1)Per the adoption of ASU 2016-01, the quarter ended March 31, 2018, reflects only net unrealized gains and reclassification of net gains to net income from debt securities. The quarter ended March 31, 2017, includes net unrealized gains from equity securities of $61 million and reclassification of gains to net income related to equity securities of $(116) million.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(2)Effective January 1, 2018, we adopted ASU 2016-04 – Liabilities – Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products, ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, and ASU 2014-09 – Revenue from Contracts With Customers (Topic 606) and subsequent related Updates. See Note 1 (Summary of Significant Accounting Policies) in this Report for more information.
[4]	(1)Effective January 1, 2017, we adopted changes in hedge accounting pursuant to ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.

Operating Segments (Details)

Operating Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)segment	Mar. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment	3
Financial Information of Operating Segment [Abstract]
Net interest income	$ 12,238	$ 12,324	[1]
Provision (reversal of provision) for credit losses	191	605
Noninterest income	9,696	9,931	[1]
Noninterest expense	15,042	13,792
Income before income tax expense (2)	6,701	7,858	[1]
Income tax expense (benefit)	1,374	2,133	[1]
Net income before noncontrolling interests (2)	5,327	5,725	[1],[2]
Less: Net income from noncontrolling interests	191	91
Wells Fargo net income (2)	5,136	5,634	[1],[3]
Average loans	951,000	963,600
Average assets	1,915,900	1,931,000
Average Deposits	1,297,200	1,299,200
Other [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	(601)	(630)
Provision (reversal of provision) for credit losses	(1)	6
Noninterest income	(816)	(772)
Noninterest expense	(928)	(860)
Income before income tax expense (2)	(488)	(548)
Income tax expense (benefit)	(122)	(208)
Net income before noncontrolling interests (2)	(366)	(340)
Less: Net income from noncontrolling interests	0	0
Wells Fargo net income (2)	(366)	(340)
Average loans	(58,500)	(56,100)
Average assets	(59,400)	(57,100)
Average Deposits	(74,200)	(81,400)
Community Banking [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	7,195	7,132
Provision (reversal of provision) for credit losses	218	646
Noninterest income	4,635	4,691
Noninterest expense	8,702	7,281
Income before income tax expense (2)	2,910	3,896
Income tax expense (benefit)	809	982
Net income before noncontrolling interests (2)	2,101	2,914
Less: Net income from noncontrolling interests	188	90
Wells Fargo net income (2)	1,913	2,824
Average loans	470,500	480,700
Average assets	1,061,900	1,095,800
Average Deposits	747,500	717,800
Wholesale Banking [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	4,532	4,681
Provision (reversal of provision) for credit losses	(20)	(43)
Noninterest income	2,747	2,896
Noninterest expense	3,978	4,167
Income before income tax expense (2)	3,321	3,453
Income tax expense (benefit)	448	973
Net income before noncontrolling interests (2)	2,873	2,480
Less: Net income from noncontrolling interests	(2)	(5)
Wells Fargo net income (2)	2,875	2,485
Average loans	465,100	468,300
Average assets	829,200	810,500
Average Deposits	446,000	465,300
Wealth and Investment Management [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	1,112	1,141
Provision (reversal of provision) for credit losses	(6)	(4)
Noninterest income	3,130	3,116
Noninterest expense	3,290	3,204
Income before income tax expense (2)	958	1,057
Income tax expense (benefit)	239	386
Net income before noncontrolling interests (2)	719	671
Less: Net income from noncontrolling interests	5	6
Wells Fargo net income (2)	714	665
Average loans	73,900	70,700
Average assets	84,200	81,800
Average Deposits	$ 177,900	$ 197,500
[1]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[2]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.
[3]	(2)Financial information for the prior period has been revised to reflect the impact of the adoption of ASU 2017-12 – Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, effective January 1, 2017.

Regulatory and Agency Capita144

Regulatory and Agency Capital Requirements (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Wells Fargo & Company [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 152,304	$ 154,765
Tier 1	175,810	178,209
Total	207,531	210,333
Assets:
Risk-weighted	1,203,464	1,199,545
Adjusted average	$ 1,886,209	$ 1,905,568
Regulatory capital ratios:
Common equity tier 1 capital	12.66%	12.90%
Tier 1 capital	14.61%	14.86%
Total capital	17.24%	17.53%
Tier 1 leverage	9.32%	9.35%
Wells Fargo & Company [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 152,304	$ 154,765
Tier 1	175,810	178,209
Total	216,237	220,097
Assets:
Risk-weighted	1,278,113	1,260,663
Adjusted average	$ 1,886,209	$ 1,905,568
Regulatory capital ratios:
Common equity tier 1 capital	11.92%	12.28%
Tier 1 capital	13.76%	14.14%
Total capital	16.92%	17.46%
Tier 1 leverage	9.32%	9.35%
Wells Fargo Bank, NA [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 141,049	$ 143,292
Tier 1	141,049	143,292
Total	154,939	156,661
Assets:
Risk-weighted	1,094,474	1,090,360
Adjusted average	$ 1,689,250	$ 1,708,828
Regulatory capital ratios:
Common equity tier 1 capital	12.89%	13.14%
Tier 1 capital	12.89%	13.14%
Total capital	14.16%	14.37%
Tier 1 leverage	8.35%	8.39%
Wells Fargo Bank, NA [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 141,049	$ 143,292
Tier 1	141,049	143,292
Total	163,259	165,734
Assets:
Risk-weighted	1,185,860	1,169,863
Adjusted average	$ 1,689,250	$ 1,708,828
Regulatory capital ratios:
Common equity tier 1 capital	11.89%	12.25%
Tier 1 capital	11.89%	12.25%
Total capital	13.77%	14.17%
Tier 1 leverage	8.35%	8.39%

Regulatory and Agency Capita145

Regulatory and Agency Capital Requirements Minimum Required Regulatory Capital Ratios – Transition Requirements (Details)	Mar. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	1.875%
GSIB Surcharge	1.50%
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.875%	6.75%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	9.375%	8.25%
Capital Required for Capital Adequacy to Risk Weighted Assets	11.375%	10.25%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Wells Fargo Bank, NA [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Assets	6.375%	5.75%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.875%	7.25%
Capital Required for Capital Adequacy to Risk Weighted Assets	9.875%	9.25%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%