Suntrust Banks 10-K 23 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ / shares in Units, $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 16, 2018	Jun. 30, 2017	Dec. 31, 2016
Entity Registrant Name	SUNTRUST BANKS INC
Entity Central Index Key	750,556
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		468,300,176
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Common Stock, Par or Stated Value Per Share	$ 1			$ 1
Entity Public Float			$ 26.8

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Interest Income
Interest and fees on loans		$ 5,385		$ 4,939		$ 4,506
Interest and fees on loans held for sale		99		92		82
Interest and Dividend Income, Securities, Available-for-sale		774		651		593
Trading account interest and other		129		96		84
Total interest income		6,387		5,778		5,265
Interest Expense
Interest on deposits		404		259		219
Interest Expense, Long-term Debt		288		260		252
Interest on other borrowings		62		38		30
Total interest expense		754		557		501
Net, interest income		5,633		5,221	[1]	4,764	[2]
Provision for Loan, Lease, and Other Losses		409	[3]	444	[1],[4]	165	[2],[5]
Interest Income (Expense), after Provision for Loan Loss		5,224		4,777		4,599
Noninterest Income
Service charges on deposit accounts		603		630		622
Fees and Commissions, Other		385		380		377
Fees and Commissions, Credit and Debit Cards		344		327		329
Investment Banking Revenue		599		494		461
Trading Gain (Loss)		189		211		181
Fees and Commissions, Fiduciary and Trust Activities		309		304		334
Investment Advisory, Management and Administrative Fees		278		281		300
Fees and Commissions, Mortgage Banking		231		366		270
Servicing Fees, Net		(191)		(189)		(169)
Gain (Loss) on Disposition of Business		107		0		0
commercial real estate related income	[6]	123		69		56
Gain (Loss) on Sale of Securities, Net		(108)		4		21
Noninterest Income, Other Operating Income	[6]	103		128		148
Total noninterest income		3,354		3,383	[1]	3,268	[2]
Noninterest Expense
Employee compensation		2,854		2,698		2,576
Other Labor-related Expenses		403		373		366
Outside processing and software		826		834		815
Net occupancy expense		377		349		341
Federal Deposit Insurance Corporation Premium Expense		187		173		139
Marketing and Advertising Expense		232		172		151
Equipment Expense		164		170		164
Other Staff Expense		121		67		65
Professional Fees		71		93		73
Operating losses		40		108		56
Amortization		75		49		40
Other Noninterest Expense		414		382		374
Noninterest Expense		5,764		5,468	[1]	5,160	[2]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		2,814		2,692		2,707
Income Tax Expense (Benefit)		532		805		764
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		2,282		1,887	[1]	1,943	[2]
Net Income (Loss) Attributable to Noncontrolling Interest		9		9	[1]	10	[2]
Net Income (Loss) Attributable to Parent		2,273		1,878	[1]	1,933	[2]
Net Income (Loss) Available to Common Stockholders, Basic		$ 2,179		$ 1,811		$ 1,863
Earnings Per Share, Diluted		$ 4.47		$ 3.60		$ 3.58
Earnings Per Share, Basic		4.53		3.63		3.62
Common Stock, Dividends, Per Share, Declared		$ 1.32		$ 1		$ 0.92
Weighted Average Number of Shares Outstanding, Diluted		486,954		503,466		520,586
Weighted Average Number of Shares Outstanding, Basic		481,339		498,638		514,844
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[4]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[5]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[6]	Beginning January 1, 2017, the Company began presenting income related to the Company's Pillar, STCC, and Structured Real Estate businesses as a separate line item on the Consolidated Statements of Income titled Commercial real estate related income. For periods prior to January 1, 2017, these amounts were previously presented in Other noninterest income and have been reclassified to Commercial real estate related income for comparability.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 2,273	$ 1,878	[1]	$ 1,933	[2]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	61	(197)		(163)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(87)	(244)		(10)
Other Comprehensive Income (Loss), Brokered Time Deposits, Net of Tax	0	(1)		0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Net of Tax	3	(2)		0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	24	88		(165)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1	(356)		(338)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 2,274	$ 1,522		$ 1,595
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

Consolidated Statements of Com4

Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ 29	$ (117)	$ (93)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0	(145)	(5)
Other Comprehensive Income (Loss), Brokered Time Deposits, Tax	0	0	0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Tax	3	(1)	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	$ 138	$ 52	$ (103)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and Due from Banks		$ 5,349	$ 5,091
Federal Funds Sold and Securities Purchased under Agreements to Resell		1,538	1,307
Interest-bearing Deposits in Banks and Other Financial Institutions		25	25
Cash and cash equivalents		6,912	6,423
Trading Securities	[1]	5,093	6,067
Available-for-sale Securities	[2]	31,416	30,672
Loans Held for Sale	[3]	2,290	4,169
Loans held for investment	[4]	143,181	143,298
Loans and Leases Receivable, Allowance		(1,735)	(1,709)
Net loans		141,446	141,589
Property, Plant and Equipment, Net		1,734	1,556
Goodwill		6,331	6,337
Intangible Assets, Net (Excluding Goodwill)	[5]	1,791	1,657
Other Assets		8,949	6,405
Total assets		205,962	204,875
Liabilities and Shareholders' Equity
Noninterest-bearing consumer and commercial deposits		42,784	43,431
Interest-bearing Deposit Liabilities		117,996	116,967
Total deposits		160,780	160,398
Federal Funds Purchased		2,561	2,116
Securities Sold under Agreements to Repurchase		1,503	1,633
Other Short-term Borrowings		717	1,015
Long-term Debt	[6],[7]	9,785	11,748
Trading liabilities		1,283	1,351
Other Liabilities		4,179	2,996
Total liabilities		180,808	181,257
Preferred Stock, Value, Outstanding		2,475	1,225
Common Stock, Value, Outstanding		550	550
Additional Paid in Capital		9,000	9,010
Retained earnings		17,540	16,000
Treasury Stock, Value	[8]	(3,591)	(2,346)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(820)	(821)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		25,154	23,618
Liabilities and Equity		$ 205,962	$ 204,875
Common Stock, Shares, Outstanding	[9]	470,931	491,188
Common shares authorized		750,000	750,000
Preferred Stock, Shares Outstanding		25	12
Preferred Stock, Shares Authorized		50,000	50,000
Treasury shares of common stock		79,133	58,738
Treasury Stock and Other
Liabilities and Shareholders' Equity
Treasury Stock, Value		$ (3,694)	$ (2,448)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	[8]	(3,591)	(2,346)
Stockholders' Equity Attributable to Noncontrolling Interest		103	103
Variable Interest Entity, Primary Beneficiary [Member]
Assets
Loans held for investment		179	211
Liabilities and Shareholders' Equity
Long-term Debt		$ 189	$ 222
Restricted Stock [Member]
Liabilities and Shareholders' Equity
Common Stock, Shares, Outstanding		9	11
Trading Securities [Member]
Liabilities and Shareholders' Equity
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 1,086	$ 1,437
Available-for-sale Securities [Member]
Liabilities and Shareholders' Equity
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 223	$ 0
[1]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[3]	Includes $1.6 billion and $3.5 billion of LHFS measured at fair value at December 31, 2017 and 2016, respectively.
[4]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[5]	Excludes fully amortized other intangible assets.
[6]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[7]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[8]	At December 31, 2017, includes ($3,694) million for treasury stock and $103 million for noncontrolling interest.At December 31, 2016, includes ($2,448) million for treasury stock, ($1) million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At December 31, 2015, includes ($1,764) million for treasury stock,($2) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.
[9]	Includes restricted shares of 9 thousand and 11 thousand at December 31, 2017 and December 31, 2016, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans Held-for-sale, Fair Value Disclosure		$ 1,577	$ 3,540
Loans Receivable, Fair Value Disclosure		196	222
Long-term Debt, Fair Value		$ 530	$ 963
Common stock, par value		$ 1	$ 1
Loans and Leases Receivable, Gross	[1]	$ 143,181	$ 143,298
Long-term Debt	[2],[3]	$ 9,785	$ 11,748
Common Stock, Shares, Outstanding	[4]	470,931	491,188
Variable Interest Entity, Primary Beneficiary [Member]
Loans and Leases Receivable, Gross		$ 179	$ 211
Long-term Debt		189	222
Treasury Stock and Other
Stockholders' Equity Attributable to Noncontrolling Interest		103	103	$ 108
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Gross		$ 38,620	$ 38,990
Restricted Stock [Member]
Common Stock, Shares, Outstanding		9	11
Trading Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 1,086	$ 1,437
Available-for-sale Securities [Member]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		223	0
Fair Value, Measurements, Recurring [Member]
Loans Held-for-sale, Fair Value Disclosure		1,577	3,540
Loans Receivable, Fair Value Disclosure		196	222
Servicing Asset at Fair Value, Amount		1,710	1,572
Long-term Debt, Fair Value		530	963
Brokered Time Deposits [Member] | Fair Value, Measurements, Recurring [Member]
Deposits, Fair Value Disclosure		$ 236	$ 78
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[3]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[4]	Includes restricted shares of 9 thousand and 11 thousand at December 31, 2017 and December 31, 2016, respectively.

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Treasury Stock and Other	[1]	AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding					525,000,000
Stock Issued During Period, Value, Employee Benefit Plan		$ 3				$ 0			$ 3
Total shareholders' equity at Dec. 31, 2014		23,005		$ 1,225	$ 550	9,089		$ 13,295	(1,032)		$ (122)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent		1,933	[2]					1,933
Other Comprehensive Income (Loss), Net of Tax		(338)									(338)
Dividends, Common Stock, Cash		(475)						(475)
Dividends, Preferred Stock, Cash	[3]	(64)						(64)
Treasury Stock, Shares, Acquired					(17,000,000)
Treasury Stock, Value, Acquired, Cost Method		(679)							(679)
Payments for Repurchase of Warrants		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000,000
Stock Issued During Period, Value, Stock Options Exercised		12				18			30
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		24				23		(3)	4
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		16							16
Total shareholders' equity at Dec. 31, 2015		23,437		1,225	$ 550	9,094		14,686	(1,658)		(460)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding					509,000,000
Cumulative Effect of Credit Risk Adjustment	[4]	0						5			(5)	[5]
Net Income (Loss) Attributable to Parent		1,878	[6]					1,878
Other Comprehensive Income (Loss), Net of Tax		(356)									(356)
Noncontrolling Interest, Period Increase (Decrease)		(5)							(5)
Dividends, Common Stock, Cash		(498)						(498)
Dividends, Preferred Stock, Cash	[3]	(66)						(66)
Treasury Stock, Shares, Acquired					(20,000,000)
Treasury Stock, Value, Acquired, Cost Method		(806)							(806)
Payments for Repurchase of Warrants		(24)				(24)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000,000
Stock Issued During Period, Value, Stock Options Exercised		25	[7]			40	[7]		65
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		31	[7]			(20)	[7]	(5)	56
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		2							2
Total shareholders' equity at Dec. 31, 2016		$ 23,618		1,225	$ 550	9,010		16,000	(2,346)		(821)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		491,188,000	[8]		491,000,000
Net Income (Loss) Attributable to Parent		$ 2,273						2,273
Other Comprehensive Income (Loss), Net of Tax		1									1
Dividends, Common Stock, Cash		(634)						(634)
Dividends, Preferred Stock, Cash	[3]	(94)						(94)
Stock Issued During Period, Value, New Issues		1,239		1,250		(11)
Treasury Stock, Shares, Acquired					(22,000,000)
Treasury Stock, Value, Acquired, Cost Method		(1,314)							(1,314)
Payments for Repurchase of Warrants		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		830,383			1,000,000
Stock Issued During Period, Value, Stock Options Exercised		$ 21				(15)			36
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		44				16		(5)	33
Total shareholders' equity at Dec. 31, 2017		$ 25,154		$ 2,475	$ 550	$ 9,000		$ 17,540	$ (3,591)		$ (820)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		470,931,000	[8]		471,000,000
[1]	At December 31, 2017, includes ($3,694) million for treasury stock and $103 million for noncontrolling interest.At December 31, 2016, includes ($2,448) million for treasury stock, ($1) million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At December 31, 2015, includes ($1,764) million for treasury stock,($2) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	For the year ended December 31, 2017, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, $5,625 per share for Perpetual Preferred Stock Series F, $3,128 per share for Perpetual Preferred Stock Series G, and $669 per share for Perpetual Preferred Stock Series H.For the year ended December 31, 2016, dividends were $4,067 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, and $5,625 per share for Perpetual Preferred Stock Series F.For the year ended December 31, 2015, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, and $5,875 per share for Perpetual Preferred Stock Series E, and $6,219 per share for Perpetual Preferred Stock Series F.
[4]	Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk, beginning January 1, 2016. See Note 1, "Significant Accounting Policies," and Note 21, "Accumulated Other Comprehensive Loss," for additional information.
[5]	Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," for additional information.
[6]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[7]	Includes a ($4) million net reclassification of excess tax benefits from Additional paid-in capital to Provision for income taxes, related to the Company's adoption of ASU 2016-09.
[8]	Includes restricted shares of 9 thousand and 11 thousand at December 31, 2017 and December 31, 2016, respectively.

Consolidated Statements of Sha8

Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Treasury Stock, Value	[1]	$ (3,591)	$ (2,346)
Common stock dividends, per share		$ 1.32	$ 1	$ 0.92
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			$ (4)
Treasury Stock and Other
Treasury Stock, Value		$ (3,694)	(2,448)	$ (1,764)
Deferred Compensation Equity		0	(1)	(2)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 103	$ 103	$ 108
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 4,056	$ 4,067	$ 4,056
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		4,056	4,067	4,056
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		5,875	5,875	5,875
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		5,625	$ 5,625	$ 6,219
Series G Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		3,128
Series H Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 669
[1]	At December 31, 2017, includes ($3,694) million for treasury stock and $103 million for noncontrolling interest.At December 31, 2016, includes ($2,448) million for treasury stock, ($1) million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At December 31, 2015, includes ($1,764) million for treasury stock,($2) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash Flows from Operating Activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 2,282	$ 1,887	[1]	$ 1,943	[2]
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Gain (Loss) on Disposition of Business	107	0		0
Depreciation, Amortization and Accretion, Net	727	725		786
Deferred Income Tax Expense (Benefit)	344	111		21
Payments to Acquire Mortgage Servicing Rights (MSR)	411	312		238
Provisions For Credit Losses And Foreclosed Properties	418	449		176
Stock Option Compensation And Amortization Of Restricted Stock Compensation	160	126		89
Gain (Loss) on Sale of Securities, Net	(108)	4		21
Gain (Loss) on Sale of Loans and Leases	269	428		323
Net decrease/(increase) in loans held for sale	(2,099)	1,819		(1,625)
Increase (Decrease) in Trading Securities	(834)	342		(67)
Net (increase)/decrease in other assets	(235)	800		407
Increase (Decrease) in Other Operating Liabilities	(911)	(274)		(166)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	5,509	(681)		3,552
Cash Flows from Investing Activities:
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	4,186	5,108		5,680
Proceeds from Sale of Available-for-sale Securities	2,854	197		2,708
Payments to Acquire Available-for-sale Securities	8,299	8,610		9,882
Proceeds from (payments for) Originations and Purchases of Loans Held-for-investment	(2,425)	(9,032)		(5,897)
Proceeds from sales of loans	720	1,612		2,127
Payments for (Proceeds from) Mortgage Servicing Rights	(7)	(171)		(117)
Capital expenditures	(410)	(283)		(186)
Payments related to acquisitions, including contingent consideration	0	(211)		(30)
Proceeds from Divestiture of Businesses	261	0		0
Proceeds from Sale of Other Real Estate	235	233		281
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(2,885)	(11,157)		(5,316)
Cash Flows from Financing Activities:
Net (decrease)/increase in total deposits	382	10,568		9,263
Net increase/(decrease) in funds purchased, securities sold under agreements to repurchase, and other short-term borrowings	17	37		(4,559)
Proceeds from Issuance of Long-term Debt	2,844	6,705		1,351
Repayment of long-term debt	(4,562)	(3,231)		(5,684)
Proceeds from Issuance of Preferred Stock and Preference Stock	1,239	0		0
Payments for Repurchase of Common Stock	(1,314)	(806)		(679)
Payments for Repurchase of Warrants	0	(24)		0
Common and preferred dividends paid	(723)	(564)		(539)
Payments Related to Tax Withholding for Share-based Compensation	(39)	(48)		(36)
Proceeds from the exercise of stock options	21	25		17
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(2,135)	12,662		(866)
Cash and Cash Equivalents, Period Increase (Decrease)	489	824		(2,630)
Cash and cash equivalents	6,423	5,599		8,229
Cash and cash equivalents	6,912	6,423		5,599
Supplemental Disclosures:
Interest Paid	730	559		523
Income Taxes Paid	415	813		497
Proceeds from Income Tax Refunds	3	2		1
Transfer of Loans Held-for-sale to Portfolio Loans	19	30		741
Transfer of Portfolio Loans and Leases to Held-for-sale	288	360		1,790
Transfer to Other Real Estate	57	59		67
Amortization Of Deferred Gain On Sale Lease Back Of Premises	17	43		54
Non-cash impact of debt acquired by purchaser in leverage lease sale	$ 184	$ 74		$ 190
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	NOTE 1 – SIGNIFICANT ACCOUNTING POLICIES General SunTrust, one of the nation's largest commercial banking organizations, is a financial services holding company with its headquarters located in Atlanta, Georgia. Through its principal subsidiary, SunTrust Bank, the Company offers a full line of financial services for consumers, businesses, corporations, institutions, and not-for-profit entities, both through its branches ( located primarily in Florida, Georgia, Virginia, North Carolina, Tennessee, Maryland, South Carolina, and the District of Columbia ) and through other national delivery channels . In addition to deposit, credit, and trust and investment services provided by the Bank, the Company's other subsidiaries provide capital markets, mortgage banking, securities brokerage, i nvestment banking, and wealth management services . The Company operates and measures business activity across two business segments: Consumer and Wholesale , with functional activities included in Corporate Other . For additional information on the Company’s business segments, see Note 20 , “Business Segment Reporting.” Principles of Consolidation and Basis of Presentation The Consolidated Financial Statements have been prepared in accordance with U.S. GAAP and include the accounts of the Company and its subsidiaries after elimination of significant intercompany accounts and transactions. In the opinion of management, all adjustments, consisting only of normal recurring adjustments that are necessary for a fair presentation of the results of operations in these financial statements, have been made. The Company holds VI s, which are contractual, ownership or other interests that fluctuate with changes in the fair value of a VIE's net assets. The Company consolidates a VIE if it is the primary beneficiary, which is the party that has both the power to direct the activities that most significantly impact the financial performance of the VIE and the obligation to absorb losses or rights to receive benefits through its VI s that could potentially be significant to the VIE. To determine whether or not a VI held by the Company could potentially be significant to the VIE, both qualitative and quantitative factors regarding the nature, size, and form of the Company's involvement with the VIE are considered. The assessment of whether or not the Company is the primary beneficiary of a VIE is performed on an ongoing basis. The Company consolidates VOE s that are controlled through the Company's equity interests or by other means. Investments in entities for which the Company has the ability to exercise significant influence, but not control, over operating and financing decisions are accounted for using the equity method of accounting. These investments are included in Other assets in the Consolidated Balance Sheets at cost, adjusted to reflect the Company's portion of income, loss, or dividends of the investee. Non marketable equity investments that do not meet the criteria to be accounted for under the equity method and that do not result in consolidation of the investee are accounted for under the cost method of accounting. Cost method investments are included in Other assets in the Consolidated Balance Sheets and dividends received from these investments are included as a component of Other noninterest income in the Consolidated Statements of Income, to the extent the dividends are distributed from net accumulated earnings of the investee since the date of acquisition. Dividends received from these investments in excess of earnings, subsequent to the date of investment, are recorded as a reduction to the cost of the investment. Results of operations of acquired entities are included from the date of acquisition. Results of operations associated with entities or net assets sold are included through the date of disposition. The Company reports any noncontrolling interests in its subsidiaries in the equity section of the Consolidated Balance Sheets and separately presents the income or loss attributable to the noncontrolling interest of a consolidated subsidiary in its Consolidated Statements of Income. Assets and liabilities of acquired entities are accounted for under the acquisition method of accounting, whereby the purchase price of an acquired entity is allocated to the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition. The excess of the purchase price over the amount allocated to the assets acquired and liabilities assumed is recorded as goodwill. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying Notes; actual results could vary from these estimates. Certain reclassifications have been made to prior period amounts to conform to the current period presentation. The Company evaluated events that occurred between December 31, 2017 and the date the accompanying financial statements were issued, and there were no material events, other than those already discussed in this Form 10-K, that would require recognition in the Company's Consolidated Financial Statements or disclosure in the accompanying Notes. Cash and Cash Equivalents Cash and cash equivalents include Cash and due from banks, Interest-bearing deposits in other banks, Fed Funds sold, and Securities borrowed or purchased under agreements to resell. Cash and cash equivalents have maturities of three months or less, and accordingly, the carrying amount of these instruments is deemed to be a reasonable estimate of fair value. Trading Activities and Securities AFS Debt securities and marketable equity securities are classified at trade date as trading or securities AFS. Trading assets and liabilities are measured at fair value with changes in fair value recognized within Noninterest income. Securities AFS are used as part of the overall asset and liability management process to optimize income and market performance over an entire interest rate cycle. Interest income and dividends on securities AFS are recognized in interest income on an accrual basis. Premiums and discounts on debt securities AFS are amortized or accreted as an adjustment to yield over the life of the security. The Company estimates principal prepayments on securities AFS for which prepayments are probable and the timing and amount of prepayments can be reasonably estimated. The estimates are informed by analyses of both historical prepayments and anticipated macroeconomic conditions, such as spot interest rates compared to implied forward interest rates. The estimate of prepayments for these debt securities impacts their lives and thereby the amortization or accretion of associated premiums and discounts. Securities AFS are measured at fair value with unrealized gains and losses, net of any tax effect, included in AOCI as a component of shareholders’ equity. Realized gains and losses, including OTTI , are determined using the specific identification method and are recognized as a component of Noninterest income in the Consolidated Statements of Income. Securities AFS are reviewed for OTTI on a quarterly basis. In determining whether OTTI exists for securities in an unrealized loss position, the Company assesses whether it has the intent to sell the security or, for debt securities, the Company assesses the likelihood of selling the security prior to the recovery of its amortized cost basis. If the Company intends to sell the debt security or it is more-likely-than-not that the Company will be required to sell the debt security prior to the recovery of its amortized cost basis, the debt security is written down to fair value, and the full amount of any impairment charge is recognized as a component of Noninterest income in the Consolidated Statements of Income. If the Company does not intend to sell the debt security and it is more-likely-than-not that the Company will not be required to sell the debt security prior to recovery of its amortized cost basis, only the credit component of any impairment of a debt security is recognized as a component of Noninterest income in the Consolidated Statements of Income, with the remaining impairment balance recorded in OCI . The OTTI review for marketable equity securities includes an analysis of the facts and circumstances of each individual investment and focuses on the severity of loss, the length of time the fair value has been below cost, the expectation for that security's performance, the financial condition and near-term prospects of the issuer, and management's intent and ability to hold the security to recovery. A decline in value of an equity security that is considered to be other-than-temporary is recognized as a component of Noninterest income in the Consolidated Statements of Income. Nonmarketable equity securities are accounted for under the cost or equity method and are included in Other assets in the Consolidated Balance Sheets. The Company reviews nonmarketable securities accounted for under the cost method on a quarterly basis, and reduces the asset value when declines in value are considered to be other-than-temporary. Equity method investments are recorded at cost, adjusted to reflect the Company’s portion of income, loss, or dividends of the investee. Realized income, realized losses, and estimated other-than-temporary losses on cost and equity method investments are recognized in Noninterest income in the Consolidated Statements of Income. For additional information on the Company’s securities activities, see Note 4 , “Trading Assets and Liabilities and Derivatives,” and Note 5 , “Securities Available for Sale.” Loans Held for Sale The Company’s LHFS generally includes certain commercial loans and consumer loans. Loans are initially classified as LHFS when they are individually identified as being available for immediate sale and management has committed to a formal plan to sell them. LHFS are recorded at either fair value, if elected, or the lower of cost or fair value. Any origination fees and costs for LHFS recorded at LOCOM are capitalized in the basis of the loan and are included in the calculation of realized gains and losses upon sale. Origination fees and costs are recognized in earnings at the time of origination for LHFS that are elected to be measured at fair value. Fair value is derived from observable current market prices, when available, and includes loan servicing value. When observable market prices are not available, the Company uses judgment and estimates fair value using internal models, in which the Company uses its best estimates of assumptions it believes would be used by market participants in estimating fair value. Adjustments to reflect unrealized gains and losses resulting from changes in fair value and realized gains and losses upon ultimate sale of the loans are classified as Noninterest income in the Consolidated Statements of Income. The Company may transfer certain loans to LHFS measured at LOCOM . At the time of transfer, any credit losses subject to charge-off in accordance with the Company's policy are recorded as a reduction in the ALLL. Any subsequent losses, including those related to interest rate or liquidity related valuation adjustments, are recorded as a component of Noninterest income in the Consolidated Statements of Income. The Company may also transfer loans from LHFS to LHFI. If an LHFS for which fair value accounting was elected is transferred to held for investment, it will continue to be accounted for at fair value in the LHFI portfolio. For additional information on the Company’s LHFS activities, see Note 6 , “Loans.” Loans Held for Investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are considered LHFI. The Company’s loan balance is comprised of loans held in portfolio, including commercial loans and consumer loans. Interest income on loans, except those classified as nonaccrual, is accrued based upon the outstanding principal amounts using the effective yield method. Commercial loans (C&I, CRE, and commercial construction) are considered to be past due when payment is not received from the borrower by the contractually specified due date. The Company typically classifies commercial loans as nonaccrual when one of the following events occurs: (i) interest or principal has been past due 90 days or more, unless the loan is both well secured and in the process of collection; (ii) collection of contractual interest or principal is not anticipated; or (iii) income for the loan is recognized on a cash basis due to the deterioration in the financial condition of the debtor. When a loan is placed on nonaccrual, accrued interest is reversed against interest income. Interest income on commercial nonaccrual loans, if recognized, is recognized after the principal has been reduced to zero. If and when commercial borrowers demonstrate the ability to repay a loan classified as nonaccrual in accordance with its contractual terms, the loan may be returned to accrual status upon meeting all regulatory, accounting, and internal policy requirements. Consumer loans secured by residential real estate (guaranteed and nonguaranteed residential mortgages, residential home equity products, and residential construction loans) are considered to be past due when a monthly payment is due and unpaid for one month. Guaranteed residential mortgages continue to accrue interest regardless of delinquency status because collection of principal and interest is reasonably assured by the government. Nonguaranteed residential mortgages and residential construction loans are generally placed on nonaccrual when three payments are past due. Residential home equity products are generally placed on nonaccrual when payments are 90 days past due. The exceptions for nonguaranteed residential mortgages, residential construction loans, and residential home equity products are: (i) when the borrower has declared bankruptcy, in which case, they are moved to nonaccrual status once they become 60 days past due, (ii) loans discharged in Chapter 7 bankruptcy that have not been reaffirmed by the borrower, in which case, they are reclassified as TDRs and moved to nonaccrual status, and (iii) second lien loans, which are classified as nonaccrual when the first lien loan is classified as nonaccrual, even if the second lien loan is performing. When a loan is placed on nonaccrual, accrued interest is reversed against interest income. Interest income on nonaccrual consumer loans secured by residential real estate is recognized on a cash basis. Nonaccrual consumer loans secured by residential real estate are typically returned to accrual status once they no longer meet the delinquency threshold that resulted in them initially being moved to nonaccrual status, with the exception of the aforementioned Chapter 7 bankruptcy loans, which remain on nonaccrual until there is six months of payment performance following discharge by the bankruptcy court. All other consumer loans (guaranteed student, other direct, indirect, and credit card loans) are considered to be past due when payment is not received from the borrower by the contractually specified due date. Guaranteed student loans continue to accrue interest regardless of delinquency status because collection of principal and interest is reasonably assured. Other direct and indirect loans are typically placed on nonaccrual when payments have been past due for 90 days or more, except when the borrower has declared bankruptcy, in which case they are moved to nonaccrual status once they become 60 days past due. When a loan is placed on nonaccrual, accrued interest is reversed against interest income. Interest income on nonaccrual loans, if recognized, is recognized on a cash basis. Nonaccrual consumer loans are typically returned to accrual status once they are no longer past due. TDRs are loans in which the borrower is experiencing financial difficulty at the time of restructure and the borrower received an economic concession either from the Company or as the product of a bankruptcy court order. A restructuring that results in only a delay in payments that is insignificant is not considered an economic concession. To date, the Company’s TDRs have been predominantly first and second lien residential mortgages and home equity lines of credit. Prior to granting a modification of a borrower’s loan terms, the Company performs an evaluation of the borrower’s financial condition and ability to service under the potential modified loan terms. The types of concessions generally granted are extensions of the loan maturity date and/or reductions in the original contractual interest rate. In certain situations, the Company may offer to restructure a loan in a manner that ultimately results in the forgiveness of a contractually specified principal balance. Typically, if a loan is accruing interest at the time of modification, the loan remains on accrual status and is subject to the Company’s charge-off and nonaccrual policies. See the “Allowance for Credit Losses” section below for further information regarding these policies. If a loan is on nonaccrual before it is determined to be a TDR then the loan remains on nonaccrual. Typically, TDRs may be returned to accrual status if there has been at least a six month sustained period of repayment performance by the borrower. Generally, once a loan becomes a TDR, the Company expects that the loan will continue to be reported as a TDR for its remaining life, even after returning to accruing status, unless the modified rates and terms at the time of modification were available to the borrower in the market or the loan is subsequently restructured with no concession to the borrower and the borrower is no longer in financial difficulty. Interest income recognition on impaired loans is dependent upon accrual status, TDR designation, and loan type as discussed above. For loans accounted for at amortized cost, fees and incremental direct costs associated with the loan origination and pricing process, as well as premiums and discounts, are deferred and amortized over the respective loan terms. Fees received for providing loan commitments that result in funded loans are recognized over the term of the loan as an adjustment of the yield. If a loan is never funded, the commitment fee is recognized in Noninterest income at the expiration of the commitment period. For any newly-originated loans that are accounted for at fair value, the origination fees are recognized in Noninterest income while the origination costs are recognized in Noninterest expense, at the time of origination. For additional information on the Company's loans activities, see Note 6 , “Loans.” Allowance for Credit Losses The allowance for credit losses is composed of the ALLL and the reserve for unfunded commitments. The Company’s ALLL reflects probable current inherent losses in the LHFI portfolio based on management’s evaluation of the size and current risk characteristics of the loan portfolio. The Company employs a variety of modeling and estimation techniques to measure credit risk and construct an appropriate and adequate ALLL. Quantitative and qualitative asset quality measures are considered in estimating the ALLL. Such evaluation considers a number of factors for each of the loan portfolio segments, including, but not limited to, net charge-off trends, internal risk ratings, changes in internal risk ratings, loss forecasts, collateral values, geographic location, delinquency rates, nonperforming and restructured loan status, origination channel, product mix, underwriting practices, industry conditions, and economic trends. Additionally, refreshed FICO scores are considered for consumer loans and single name borrower concentration is considered for commercial loans. These credit quality factors are incorporated into various loss estimation models and analytical tools utilized in the ALLL process and/or are qualitatively considered in evaluating the overall reasonableness of the ALLL. Large commercial nonaccrual loans, certain consumer loans (nonguaranteed residential mortgages, residential home equity products, residential construction, other direct, indirect, and credit card), and commercial loans whose terms have been modified in a TDR are reviewed to determine the amount of specific allowance required in accordance with applicable accounting guidance. A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due, including principal and interest, according to the contractual terms of the agreement. If necessary, an allowance is established for these specifically evaluated impaired loans. The specific allowance established for these loans is based on a thorough analysis of the most probable source of repayment, including the present value of the loan’s expected future cash flows, the loan’s estimated market value, or the estimated fair value of the underlying collateral, net of estimated selling costs. Any change in the present value attributable to the passage of time is recognized through the Provision for credit losses. General allowances are established for loans and leases grouped into pools based on similar characteristics. In this process, general allowance factors are based on an analysis of historical charge-off experience, expected loss factors derived from the Company's internal risk rating process, portfolio trends, and regional and national economic conditions. Other adjustments may be made to the ALLL after an assessment of internal and external influences on credit quality that may not be fully reflected in the historical loss or risk rating data. These influences may include elements such as changes in credit underwriting, concentration risk, macroeconomic conditions, and/or recent observable asset quality trends. Commercial loans are charged off when they are considered uncollectible. Losses on unsecured consumer loans are generally recognized at 120 days past due, except for losses on credit cards, which are recognized when the loans are 180 days past due, and losses on guaranteed student loans, which are recognized when the loans are 270 days past due and payment from the guarantor is processed by the servicer. However, if the borrower is in bankruptcy, the loan is charged-off in the month the loan becomes 60 days past due. Losses, as appropriate, on consumer loans secured by residential real estate, are typically recognized at 120 or 180 days past due, depending on the loan and collateral type, in compliance with the FFIEC guidelines. However, if the borrower is in bankruptcy, the secured asset is evaluated once the loan becomes 60 days past due. The loan value in excess of the secured asset value is written down or charged-off after the valuation occurs. Additionally, if a residential loan is discharged in Chapter 7 bankruptcy and not reaffirmed by the borrower, the Company's policy is to immediately charge-off the excess of the carrying amount over the fair value of the collateral. The Company uses numerous sources of information when evaluating a property’s value. Estimated collateral valuations are based on appraisals, broker price opinions, recent sales of foreclosed properties, automated valuation models, other property-specific information, and relevant market information, supplemented by the Company’s internal property valuation analysis. The value estimate is based on an orderly disposition of the property, inclusive of marketing costs. In limited instances, the Company adjusts externally provided appraisals for justifiable and well-supported reasons, such as an appraiser not being aware of certain property-specific factors or recent sales information. For commercial loans secured by real estate, an acceptable third party appraisal or other form of evaluation, as permitted by regulation, is obtained prior to the origination of the loan and upon a subsequent transaction involving a material change in terms. In addition, updated valuations may be obtained during the life of a loan, as appropriate, such as when a loan's performance materially deteriorates. In situations where an updated appraisal has not been received or a formal evaluation performed, the Company monitors factors that can positively or negatively impact property value, such as the date of the last valuation, the volatility of property values in specific markets, changes in the value of similar properties, and changes in the characteristics of individual properties. Changes in collateral value affect the ALLL through the risk rating or impaired loan evaluation process. Charge-offs are recognized when the amount of the loss is quantifiable and timing is known. The charge-off is measured based on the difference between the loan’s carrying value, including deferred fees, and the estimated realizable value of the property, net of estimated selling costs. When valuing a property for the purpose of determining a charge-off, a third party appraisal or an independently derived internal evaluation is generally employed. For nonguaranteed mortgage loans secured by residential real estate where the Company is proceeding with a foreclosure action, a new valuation is obtained prior to the loan becoming 180 days past due and, if required, the loan is written down to its realizable value, net of estimated selling costs. In the event the Company decides not to proceed with a foreclosure action, the full balance of the loan is charged-off. If a loan remains in the foreclosure process for 12 months past the original charge-off, the Company may obtain a new valuation. Any additional loss based on the new valuation is charged-off. At foreclosure, a new valuation is obtained and the loan is transferred to OREO at fair value less estimated selling costs; any loan balance in excess of the transfer value is charged-off. Estimated declines in value of the collateral between these formal evaluation events are captured in the ALLL based on changes in the house price index in the applicable metropolitan statistical area or other market information. In addition to the ALLL, the Company also estimates probable losses related to unfunded lending commitments, such as letters of credit and binding unfunded loan commitments. Unfunded lending commitments are analyzed and segregated by risk based on the Company’s internal risk rating scale. These risk classifications, in combination with probability of commitment usage, existing economic conditions, and any other pertinent information, result in the estimation of the reserve for unfunded lending commitments. The Unfunded commitments reserve is reported in Other liabilities on the Consolidated Balance Sheets and the provision associated with changes in the Unfunded commitment reserve is recognized in the Provision for credit losses in the Consolidated Statements of Income. For additional information on the Company's allowance for credit loss activities, see Note 7 , “Allowance for Credit Losses.” Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is calculated predominantly using the straight-line method over the assets’ estimated useful lives. Leasehold improvements are amortized using the straight-line method over the shorter of the improvements' estimated useful lives or the lease term. Construction and software in process includes costs related to in-process branch expansion, branch renovation, and software development projects. Upon completion, branch and office related projects are maintained in premises and equipment while completed software projects are reclassified to Other assets in the Consolidated Balance Sheets. Maintenance and repairs are charged to expense, and improvements that extend the useful life of an asset are capitalized and depreciated over the remaining useful life. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. For additional information on the Company’s premises and equipment activities, see Note 8 , “Premises and Equipment.” Goodwill and Other Intangible Assets Goodwill represents the excess purchase price over the fair value of identifiable net assets of acquired companies. Goodwill is assigned to reporting units that are expected to benefit from the synergies of the business combination. Goodwill is tested at the reporting unit level for impairment, at least annually as of October 1, or as events and circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying amount. If, after considering all relevant events and circumstances, the Company determines it is not more-likely-than-not that the fair value of a reporting unit is less than its carrying amount, then performing an impairment test is not necessary. If the Company elects to bypass the qualitative analysis, or concludes via qualitative analysis that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying value, a two-step goodwill impairment test is performed. In the first step, the fair value of each reporting unit is compared with its carrying value. If the fair value is greater than the carrying value, then the reporting unit's goodwill is deemed not to be impaired. If the fair value is less than the carrying value, then the second step is performed, which measures the amount of impairment by comparing the carrying amount of goodwill to its implied fair value. If the implied fair value of the goodwill exceeds the carrying amount, there is no impairment. If the carrying amount exceeds the implied fair value of the goodwill, an impairment charge is recorded for the excess. The Company has identified intangible assets with finite and indefinite lives. Intangible assets that have finite lives are amortized over their useful lives and carried at amortized cost. Intangible assets that have indefinite lives are initially measured at fair value and are not amortized until the useful life is no longer considered indefinite. Indefinite-lived intangibles are tested for impairment at least annually; however, all intangible assets are evaluated for impairment whenever events or changes in circumstances indicate it is more likely than not that the asset is impaired. For additional information on the Company’s activities related to goodwill and other intangibles, see Note 9 , “Goodwill and Other Intangible Assets.” Servicing Rights The Company recognizes as assets the rights to service loans, either when the loans are sold and the associated servicing rights are retained or when servicing rights are purchased from a third party. All servicing rights are initially measured at fair value. Fair value is determined by projecting net servicing cash flows, which are then discounted to estimate fair value. The fair value of servicing rights is impacted by a variety of factors, including prepayment assumptions, discount rates, delinquency rates, contractually specified servicing fees, servicing costs, and underlying portfolio characteristics. The underlying assumptions and estimated values are corroborated by values received from independent third parties and comparisons to market transactions. The Company has elected to subsequently account for its residential MSRs under the fair value measurement method and actively hedges the change in fair value of its residential MSRs. The Company has elected to subsequently account for all other servicing rights, which include commercial mortgage and consumer loan servicing rights, under the amortization method. Commercial mortgage and consumer loan servicing rights are amortized in proportion to and over the period of estimated net servicing income. Servicing rights accounted for under the amortization method are periodically tested for impairment by comparing the carrying amount of the servicing rights to the estimated fair value. Servicing rights are included in Other intangible assets on the Consolidated Balance Sheets. For residential MSRs, both servicing fees, which are recognized when they are received, and changes in the fair value of MSRs are reported in Mortgage servicing related income in the Consolidated Statements of Income. For commercial mortgage servicing rights, servicing fees, amortization, and any impairment is recognized in Commercial real estate related income in the Cons

Acquisitions_Dispositions Acqui

Acquisitions/Dispositions Acquisitions/Dispositions (Notes)	12 Months Ended
	Dec. 31, 2017
Acquisitions/Dispositions [Abstract]
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	NOTE 2 - ACQUISITIONS/DISPOSITIONS During the years ended December 31, 2017, 2016, and 2015 , the Company had the following notable acquisition and disposition: (Dollars in millions) Date Consideration Received/(Paid) Goodwill Other Intangible Assets Pre-tax Gain 2017 Sale of PAC 12/1/2017 $261 ($7 ) $— $107 2016 Acquisition of Pillar 12/15/2016 ($197 ) $1 $13 1 $— 1 Does not include $62 million of commercial mortgage servicing rights acquired. Sale of PAC On December 1, 2017 , the Company completed the sale of PAC , its commercial lines insurance premium finance subsidiary with $1.3 billion in assets and $1.2 billion in liabilities, to IPFS Corporation. As a result, the Company received consideration of $261 million and recognized a pre-tax gain of $107 million in connection with the sale, net of transaction-related expenses. The Company's results for the years ended December 31, 2017, 2016, and 2015 included the following related to PAC , excluding the gain on sale: (Dollars in millions) PAC Financial Information: 2017 2016 2015 Revenue $56 $60 $59 Less: Expenses 31 27 22 Income before provision for income taxes $25 $33 $37 For all periods presented, the financial results of PAC through the date of disposition, including the gain on sale, are reflected in the Company's Wholesale business segment. Acquisition of Pillar On December 15, 2016 , the Company completed the acquisition of substantially all of the assets of the operating subsidiaries of Pillar Financial, LLC, a multi-family agency lending and servicing company with an originate-to-distribute focus that holds licenses with Fannie Mae , Freddie Mac , and the FHA . The acquired assets include Pillar 's multi-family lending business, which is comprised of multi-family affordable housing, health care properties, senior housing, and manufactured housing specialty teams. Additionally, the transaction includes Cohen Financial's commercial real estate investor services business, which provides loan administration, advisory, and commercial mortgage brokerage services. During the second quarter of 2017, the final settlement amount associated with working capital adjustments was reached and the purchase consideration of $197 million was finalized. There were no other material acquisitions or dispositions during the three years ended December 31, 2017 .

Federal Funds Sold and Securiti

Federal Funds Sold and Securities Financing Activities	12 Months Ended
	Dec. 31, 2017
Securities Purchased under Agreements to Resell [Abstract]
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	NOTE 3 - FEDERAL FUNDS SOLD AND SECURITIES FINANCING ACTIVITIES Federal Funds Sold and Securities Borrowed or Purchased Under Agreements to Resell Fed Funds sold and securities borrowed or purchased under agreements to resell were as follows: (Dollars in millions) December 31, 2017 December 31, 2016 Fed funds sold $65 $58 Securities borrowed 298 270 Securities purchased under agreements to resell 1,175 979 Total Fed funds sold and securities borrowed or purchased under agreements to resell $1,538 $1,307 Securities purchased under agreements to resell are primarily collateralized by U.S. government or agency securities and are carried at the amounts at which the securities will be subsequently resold, plus accrued interest. Securities borrowed are primarily collateralized by corporate securities. The Company borrows securities and purchases securities under agreements to resell as part of its securities financing activities. On the acquisition date of these securities, the Company and the related counterparty agree on the amount of collateral required to secure the principal amount loaned under these arrangements. The Company monitors collateral values daily and calls for additional collateral to be provided as warranted under the respective agreements. At December 31, 2017 and 2016 , the total market value of collateral held was $1.5 billion and $1.3 billion , of which $177 million and $246 million was repledged, respectively. Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase are accounted for as secured borrowings. The following table presents the Company’s related activity, by collateral type and remaining contractual maturity: December 31, 2017 December 31, 2016 (Dollars in millions) Overnight and Continuous Up to 30 days 30-90 days Total Overnight and Continuous Up to 30 days 30-90 days Total U.S. Treasury securities $95 $— $— $95 $27 $— $— $27 Federal agency securities 101 15 — 116 288 24 — 312 MBS - agency 694 135 — 829 793 51 — 844 CP 19 — — 19 49 — — 49 Corporate and other debt securities 316 88 40 444 311 50 40 401 Total securities sold under agreements to repurchase $1,225 $238 $40 $1,503 $1,468 $125 $40 $1,633 For these securities sold under agreements to repurchase, the Company would be obligated to provide additional collateral in the event of a significant decline in fair value of the collateral pledged. This risk is managed by monitoring the liquidity and credit quality of the collateral, as well as the maturity profile of the transactions. Netting of Securities - Repurchase and Resell Agreements The Company has various financial assets and financial liabilities that are subject to enforceable master netting agreements or similar agreements. The Company's derivatives that are subject to enforceable master netting agreements or similar agreements are discussed in Note 17 , "Derivative Financial Instruments." The following table presents the Company's securities borrowed or purchased under agreements to resell and securities sold under agreements to repurchase that are subject to MRA s. Generally, MRA s require collateral to exceed the asset or liability recognized on the balance sheet. Transactions subject to these agreements are treated as collateralized financings, and those with a single counterparty are permitted to be presented net on the Company's Consolidated Balance Sheets, provided certain criteria are met that permit balance sheet netting. At December 31, 2017 and 2016 , there were no such transactions subject to legally enforceable MRA s that were eligible for balance sheet netting. The following table includes the amount of collateral pledged or received related to exposures subject to enforceable MRA s. While these agreements are typically over-collateralized, the amount of collateral presented in this table is limited to the amount of the related recognized asset or liability for each counterparty. (Dollars in millions) Gross Amount Amount Offset Net Amount Presented in Consolidated Balance Sheets Held/Pledged Financial Instruments Net Amount December 31, 2017 Financial assets: Securities borrowed or purchased under agreements to resell $1,473 $— $1,473 1 $1,462 $11 Financial liabilities: Securities sold under agreements to repurchase 1,503 — 1,503 1,503 — December 31, 2016 Financial assets: Securities borrowed or purchased under agreements to resell $1,249 $— $1,249 1 $1,241 $8 Financial liabilities: Securities sold under agreements to repurchase 1,633 — 1,633 1,633 — 1 Excludes $65 million and $58 million of Fed Funds sold, which are not subject to a master netting agreement at December 31, 2017 and 2016 , respectively.

Trading Assets and Liabilities

Trading Assets and Liabilities and Derivatives Trading Assets and Liabilities and Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Trading Assets and Liabilities and Derivatives [Text Block]	NOTE 4 - TRADING ASSETS AND LIABILITIES AND DERIVATIVE INSTRUMENTS The fair values of the components of trading assets and liabilities and derivative instruments are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Trading Assets and Derivative Instruments: U.S. Treasury securities $157 $539 Federal agency securities 395 480 U.S. states and political subdivisions 61 134 MBS - agency 700 567 CLO securities — 1 Corporate and other debt securities 655 656 CP 118 140 Equity securities 56 49 Derivative instruments 1 802 984 Trading loans 2 2,149 2,517 Total trading assets and derivative instruments $5,093 $6,067 Trading Liabilities and Derivative Instruments: U.S. Treasury securities $577 $697 MBS - agency — 1 Corporate and other debt securities 289 255 Equity securities 9 — Derivative instruments 1 408 398 Total trading liabilities and derivative instruments $1,283 $1,351 1 Amounts include the impact of offsetting cash collateral received from and paid to the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. 2 Includes loans related to TRS . Various trading and derivative instruments are used as part of the Company’s overall balance sheet management strategies and to support client requirements executed through the Bank and/or STRH , a broker/dealer subsidiary of the Company. The Company manages the potential market volatility associated with trading instruments by using appropriate risk management strategies. The size, volume, and nature of the trading products and derivative instruments can vary based on economic conditions as well as client-specific and Company-specific asset or liability positions. Product offerings to clients include debt securities, loans traded in the secondary market, equity securities, derivative contracts, and other similar financial instruments. Other trading-related activities include acting as a market maker for certain debt and equity security transactions, derivative instrument transactions, and foreign exchange transactions. The Company also uses derivatives to manage its interest rate and market risk from non-trading activities. The Company has policies and procedures to manage market risk associated with client trading and non-trading activities, and assumes a limited degree of market risk by managing the size and nature of its exposure. For valuation assumptions and additional information related to the Company's trading products and derivative instruments, see Note 17 , “Derivative Financial Instruments,” and the “ Trading Assets and Derivative Instruments and Securities Available for Sale ” section of Note 18 , “Fair Value Election and Measurement.” Pledged trading assets are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Pledged trading assets to secure repurchase agreements 1 $1,016 $968 Pledged trading assets to secure certain derivative agreements 72 471 Pledged trading assets to secure other arrangements 41 40 1 Repurchase agreements secured by collateral totaled $975 million and $928 million at December 31, 2017 and 2016 , respectively.

Securities Available for Sale

Securities Available for Sale	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale	NOTE 5 – SECURITIES AVAILABLE FOR SALE Securities Portfolio Composition December 31, 2017 (Dollars in millions) Amortized Unrealized Unrealized Fair U.S. Treasury securities $4,361 $2 $32 $4,331 Federal agency securities 257 3 1 259 U.S. states and political subdivisions 618 7 8 617 MBS - agency residential 22,616 222 134 22,704 MBS - agency commercial 2,121 3 38 2,086 MBS - non-agency residential 55 4 — 59 MBS - non-agency commercial 862 7 3 866 ABS 6 2 — 8 Corporate and other debt securities 17 — — 17 Other equity securities 1 472 — 3 469 Total securities AFS $31,385 $250 $219 $31,416 December 31, 2016 (Dollars in millions) Amortized Unrealized Unrealized Fair U.S. Treasury securities $5,486 $5 $86 $5,405 Federal agency securities 310 5 2 313 U.S. states and political subdivisions 279 5 5 279 MBS - agency residential 22,379 311 254 22,436 MBS - agency commercial 1,263 2 39 1,226 MBS - non-agency residential 71 3 — 74 MBS - non-agency commercial 257 — 5 252 ABS 8 2 — 10 Corporate and other debt securities 34 1 — 35 Other equity securities 1 642 1 1 642 Total securities AFS $30,729 $335 $392 $30,672 1 At December 31, 2017 , the fair value of other equity securities was comprised of the following: $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, $49 million of mutual fund investments, and $2 million of other. At December 31, 2016 , the fair value of other equity securities was comprised of the following: $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $102 million of mutual fund investments, and $6 million of other. The following table presents interest and dividends on securities AFS: Year Ended December 31 (Dollars in millions) 2017 2016 2015 Taxable interest $743 $630 $552 Tax-exempt interest 13 6 6 Dividends 18 15 35 Total interest and dividends on securities AFS $774 $651 $593 Securities AFS pledged to secure public deposits, repurchase agreements, trusts, certain derivative agreements, and other funds had a fair value of $4.3 billion and $2.0 billion at December 31, 2017 and 2016 , respectively. The following table presents the amortized cost, fair value, and weighted average yield of investments in debt securities AFS at December 31, 2017 , by remaining contractual maturity, with the exception of MBS and ABS , which are based on estimated average life. Receipt of cash flows may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalties. Distribution of Remaining Maturities (Dollars in millions) Due in 1 Year or Less Due After 1 Year through 5 Years Due After 5 Years through 10 Years Due After 10 Years Total Amortized Cost: U.S. Treasury securities $— $2,322 $2,039 $— $4,361 Federal agency securities 121 46 4 86 257 U.S. states and political subdivisions 6 49 149 414 618 MBS - agency residential 2,686 7,937 11,781 212 22,616 MBS - agency commercial — 315 1,547 259 2,121 MBS - non-agency residential — 55 — — 55 MBS - non-agency commercial — 12 813 37 862 ABS — 6 — — 6 Corporate and other debt securities 7 10 — — 17 Total debt securities AFS $2,820 $10,752 $16,333 $1,008 $30,913 Fair Value: U.S. Treasury securities $— $2,305 $2,026 $— $4,331 Federal agency securities 123 47 4 85 259 U.S. states and political subdivisions 6 52 153 406 617 MBS - agency residential 2,748 7,980 11,763 213 22,704 MBS - agency commercial — 308 1,525 253 2,086 MBS - non-agency residential — 59 — — 59 MBS - non-agency commercial — 12 816 38 866 ABS — 8 — — 8 Corporate and other debt securities 7 10 — — 17 Total debt securities AFS $2,884 $10,781 $16,287 $995 $30,947 Weighted average yield 1 3.36 % 2.34 % 2.81 % 3.23 % 2.71 % 1 Weighted average yields are based on amortized cost and presented on an FTE basis. Securities AFS in an Unrealized Loss Position The Company held certain investment securities AFS where amortized cost exceeded fair value, resulting in unrealized loss positions. Market changes in interest rates and credit spreads may result in temporary unrealized losses as the market prices of securities fluctuate. At December 31, 2017 , the Company did not intend to sell these securities nor was it more-likely-than-not that the Company would be required to sell these securities before their anticipated recovery or maturity. The Company reviewed its portfolio for OTTI in accordance with the accounting policies described in Note 1 , "Significant Accounting Policies." Securities AFS in an unrealized loss position at period end are presented in the following tables: December 31, 2017 Less than twelve months Twelve months or longer Total (Dollars in millions) Fair Unrealized 2 Fair Unrealized 2 Fair Unrealized 2 Temporarily impaired securities AFS: U.S. Treasury securities $1,993 $12 $841 $20 $2,834 $32 Federal agency securities 23 — 60 1 83 1 U.S. states and political subdivisions 267 3 114 5 381 8 MBS - agency residential 8,095 38 4,708 96 12,803 134 MBS - agency commercial 887 9 915 29 1,802 38 MBS - non-agency commercial 134 1 93 2 227 3 ABS — — 4 — 4 — Corporate and other debt securities 10 — — — 10 — Other equity securities — — 2 3 2 3 Total temporarily impaired securities AFS 11,409 63 6,737 156 18,146 219 OTTI securities AFS 1 : ABS — — 1 — 1 — Total OTTI securities AFS — — 1 — 1 — Total impaired securities AFS $11,409 $63 $6,738 $156 $18,147 $219 1 OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings. 2 Unrealized losses less than $0.5 million are presented as zero within the table. December 31, 2016 Less than twelve months Twelve months or longer Total (Dollars in millions) Fair Value Unrealized Losses 2 Fair Value Unrealized 2 Fair Value Unrealized Losses 2 Temporarily impaired securities AFS: U.S. Treasury securities $4,380 $86 $— $— $4,380 $86 Federal agency securities 96 2 3 — 99 2 U.S. states and political subdivisions 149 5 — — 149 5 MBS - agency residential 13,505 247 436 7 13,941 254 MBS - agency commercial 1,117 38 15 1 1,132 39 MBS - non-agency commercial 184 5 — — 184 5 ABS — — 5 — 5 — Corporate and other debt securities 12 — — — 12 — Other equity securities — — 4 1 4 1 Total temporarily impaired securities AFS 19,443 383 463 9 19,906 392 OTTI securities AFS 1 : MBS - non-agency residential 16 — — — 16 — ABS — — 1 — 1 — Total OTTI securities AFS 16 — 1 — 17 — Total impaired securities AFS $19,459 $383 $464 $9 $19,923 $392 1 OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings. 2 Unrealized losses less than $0.5 million are presented as zero within the table. At December 31, 2017 , temporarily impaired securities AFS that have been in an unrealized loss position for twelve months or longer included residential and commercial agency MBS , U.S. Treasury securities, municipal securities, commercial non-agency MBS, federal agency securities, one ABS collateralized by 2004 vintage home equity loans, and one equity security. Unrealized losses on temporarily impaired securities were due to market interest rates being higher than the securities' stated coupon rates. Unrealized losses on securities AFS that relate to factors other than credit are recorded in AOCI, net of tax. Realized Gains and Losses and Other-Than-Temporarily Impaired Securities AFS Year Ended December 31 (Dollars in millions) 2017 2016 2015 Gross realized gains $3 $4 $25 Gross realized losses (110 ) — (3 ) OTTI credit losses recognized in earnings (1 ) — (1 ) Net securities (losses)/gains ($108 ) $4 $21 Securities AFS in an unrealized loss position are evaluated quarterly for other-than-temporary credit impairment, which is determined using cash flow analyses that take into account security specific collateral and transaction structure. Future expected credit losses are determined using various assumptions, the most significant of which include default rates, prepayment rates, and loss severities. If, based on this analysis, a security is in an unrealized loss position and the Company does not expect to recover the entire amortized cost basis of the security, the expected cash flows are then discounted at the security’s initial effective interest rate to arrive at a present value amount. Credit losses on the OTTI security are recognized in earnings and reflect the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security. See Note 1 , "Significant Accounting Policies," for additional information regarding the Company's policy on securities AFS and related impairments. The Company seeks to reduce existing exposure on OTTI securities primarily through paydowns. In certain instances, the amount of credit losses recognized in earnings on a debt security exceeds the total unrealized losses on the security, which may result in unrealized gains relating to factors other than credit recorded in AOCI, net of tax. During the years ended December 31, 2017, 2016, and 2015 , credit impairment losses recognized on securities AFS held at the end of each period were immaterial. The accumulated balance of OTTI credit losses recognized in earnings on securities AFS held at period end was $23 million , $23 million , and $25 million at December 31, 2017, 2016, and 2015 , respectively. Subsequent credit losses may be recorded on securities without a corresponding further decline in fair value when there has been a decline in expected cash flows. The following table presents a summary of the significant inputs used in determining the measurement of OTTI credit losses recognized in earnings for non-agency MBS for the years ended December 31 : 2017 1 2016 2 2015 1 Default rate 3% N/A 9% Prepayment rate 19% N/A 13% Loss severity 41% N/A 56% 1 OTTI credit losses recognized in earnings relate to one non-agency MBS with a fair value of $12 million and $20 million at December 31, 2017 and 2015, respectively. 2 "N/A" - Not applicable as there were no OTTI credit losses recognized in earnings for the year ended December 31, 2016 . Significant inputs represent lifetime average estimates of each security for which credit losses were recognized in earnings. Inputs may vary from period to period as the securities for which credit losses are recognized vary. Additionally, severity may vary widely when losses are few and large.

Loans

Loans	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block]	NOTE 6 - LOANS Composition of Loan Portfolio (Dollars in millions) December 31, 2017 December 31, 2016 Commercial loans: C&I 1 $66,356 $69,213 CRE 5,317 4,996 Commercial construction 3,804 4,015 Total commercial loans 75,477 78,224 Consumer loans: Residential mortgages - guaranteed 560 537 Residential mortgages - nonguaranteed 2 27,136 26,137 Residential home equity products 10,626 11,912 Residential construction 298 404 Guaranteed student 6,633 6,167 Other direct 8,729 7,771 Indirect 12,140 10,736 Credit cards 1,582 1,410 Total consumer loans 67,704 65,074 LHFI $143,181 $143,298 LHFS 3 $2,290 $4,169 1 Includes $3.7 billion of lease financing at both December 31, 2017 and 2016 , and $778 million and $729 million of installment loans at December 31, 2017 and 2016 , respectively. 2 Includes $196 million and $222 million of LHFI measured at fair value at December 31, 2017 and 2016 , respectively. 3 Includes $1.6 billion and $3.5 billion of LHFS measured at fair value at December 31, 2017 and 2016 , respectively. During the years ended December 31, 2017 and 2016 , the Company transferred $288 million and $360 million of LHFI to LHFS, and transferred $19 million and $30 million of LHFS to LHFI, respectively. In addition to sales of residential and commercial mortgage LHFS in the normal course of business, the Company sold $705 million and $1.6 billion of loans and leases for an immaterial net gain and a net gain of $6 million during the years ended December 31, 2017 and 2016 , respectively. During the year ended December 31, 2017 , the Company purchased $1.7 billion of guaranteed student loans and $233 million of consumer indirect loans, and during the year ended December 31, 2016 , the Company purchased $2.2 billion of guaranteed student loans. At December 31, 2017 and 2016 , the Company had $24.3 billion and $22.6 billion of net eligible loan collateral pledged to the Federal Reserve discount window to support $18.2 billion and $17.0 billion of available, unused borrowing capacity, respectively. At December 31, 2017 and 2016 , the Company had $38.0 billion and $36.9 billion of net eligible loan collateral pledged to the FHLB of Atlanta to support $30.5 billion and $31.9 billion of available borrowing capacity, respectively. The available FHLB borrowing capacity at December 31, 2017 was used to support $4 million of long-term debt and $6.7 billion of letters of credit issued on the Company's behalf. At December 31, 2016 , the available FHLB borrowing capacity was used to support $2.8 billion of long-term debt and $7.3 billion of letters of credit issued on the Company's behalf. Credit Quality Evaluation The Company evaluates the credit quality of its loan portfolio by employing a dual internal risk rating system, which assigns both PD and LGD ratings to derive expected losses. Assignment of these ratings are predicated upon numerous factors, including consumer credit risk scores, rating agency information, borrower/guarantor financial capacity, LTV ratios, collateral type, debt service coverage ratios, collection experience, other internal metrics/analyses, and/or qualitative assessments. For the commercial portfolio, the Company believes that the most appropriate credit quality indicator is an individual loan’s risk assessment expressed according to the broad regulatory agency classifications of Pass or Criticized. The Company conforms to the following regulatory classifications for Criticized assets: Other Assets Especially Mentioned (or Special Mention), Adversely Classified, Doubtful, and Loss. However, for the purposes of disclosure, management believes the most meaningful distinction within the Criticized categories is between Criticized accruing (which includes Special Mention and a portion of Adversely Classified) and Criticized nonaccruing (which includes a portion of Adversely Classified and Doubtful and Loss). This distinction identifies those relatively higher risk loans for which there is a basis to believe that the Company will not collect all amounts due under those loan agreements. The Company's risk rating system is more granular, with multiple risk ratings in both the Pass and Criticized categories. Pass ratings reflect relatively low PD s, whereas, Criticized assets have higher PD s. The granularity in Pass ratings assists in establishing pricing, loan structures, approval requirements, reserves, and ongoing credit management requirements. Commercial risk ratings are refreshed at least annually, or more frequently as appropriate, based upon considerations such as market conditions, borrower characteristics, and portfolio trends. Additionally, management routinely reviews portfolio risk ratings, trends, and concentrations to support risk identification and mitigation activities. For consumer loans, the Company monitors credit risk based on indicators such as delinquencies and FICO scores. The Company believes that consumer credit risk, as assessed by the industry-wide FICO scoring method, is a relevant credit quality indicator. Borrower-specific FICO scores are obtained at origination as part of the Company’s formal underwriting process, and refreshed FICO scores are obtained by the Company at least quarterly. For guaranteed loans, the Company monitors the credit quality based primarily on delinquency status, as it is a more relevant indicator of credit quality due to the government guarantee. At December 31, 2017 and 2016 , 28% and 29% , respectively, of guaranteed residential mortgages were current with respect to payments. At both December 31, 2017 and 2016 , 75% of guaranteed student loans were current with respect to payments. The Company's loss exposure on guaranteed residential mortgages and student loans is mitigated by the government guarantee. LHFI by credit quality indicator are presented in the following tables: Commercial Loans C&I CRE Commercial Construction (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Risk rating: Pass $64,546 $66,961 $5,126 $4,574 $3,770 $3,914 Criticized accruing 1,595 1,862 167 415 33 84 Criticized nonaccruing 215 390 24 7 1 17 Total $66,356 $69,213 $5,317 $4,996 $3,804 $4,015 Consumer Loans 1 Residential Mortgages - Nonguaranteed Residential Home Equity Products Residential Construction (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Current FICO score range: 700 and above $23,602 $22,194 $8,946 $9,826 $240 $292 620 - 699 2,721 3,042 1,242 1,540 50 96 Below 620 2 813 901 438 546 8 16 Total $27,136 $26,137 $10,626 $11,912 $298 $404 Other Direct Indirect Credit Cards (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Current FICO score range: 700 and above $7,929 $7,008 $9,094 $7,642 $1,088 $974 620 - 699 757 703 2,344 2,381 395 351 Below 620 2 43 60 702 713 99 85 Total $8,729 $7,771 $12,140 $10,736 $1,582 $1,410 1 Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016 , respectively, for which there was nominal risk of principal loss due to the government guarantee. 2 For substantially all loans with refreshed FICO scores below 620, the borrower’s FICO score at the time of origination exceeded 620 but has since deteriorated as the loan has seasoned. The LHFI portfolio by payment status is presented in the following tables: December 31, 2017 (Dollars in millions) Accruing Current Accruing 30-89 Days Past Due Accruing 90+ Days Past Due Nonaccruing 2 Total Commercial loans: C&I $66,092 $42 $7 $215 $66,356 CRE 5,293 — — 24 5,317 Commercial construction 3,803 — — 1 3,804 Total commercial loans 75,188 42 7 240 75,477 Consumer loans: Residential mortgages - guaranteed 159 55 346 — 560 Residential mortgages - nonguaranteed 1 26,778 148 4 206 27,136 Residential home equity products 10,348 75 — 203 10,626 Residential construction 280 7 — 11 298 Guaranteed student 4,946 659 1,028 — 6,633 Other direct 8,679 36 7 7 8,729 Indirect 12,022 111 — 7 12,140 Credit cards 1,556 13 13 — 1,582 Total consumer loans 64,768 1,104 1,398 434 67,704 Total LHFI $139,956 $1,146 $1,405 $674 $143,181 1 Includes $196 million of loans measured at fair value, the majority of which were accruing current. 2 Nonaccruing loans past due 90 days or more totaled $357 million . Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans. December 31, 2016 (Dollars in millions) Accruing Current Accruing 30-89 Days Past Due Accruing 90+ Days Past Due Nonaccruing 2 Total Commercial loans: C&I $68,776 $35 $12 $390 $69,213 CRE 4,988 1 — 7 4,996 Commercial construction 3,998 — — 17 4,015 Total commercial loans 77,762 36 12 414 78,224 Consumer loans: Residential mortgages - guaranteed 155 55 327 — 537 Residential mortgages - nonguaranteed 1 25,869 84 7 177 26,137 Residential home equity products 11,596 81 — 235 11,912 Residential construction 389 3 — 12 404 Guaranteed student 4,637 603 927 — 6,167 Other direct 7,726 35 4 6 7,771 Indirect 10,608 126 1 1 10,736 Credit cards 1,388 12 10 — 1,410 Total consumer loans 62,368 999 1,276 431 65,074 Total LHFI $140,130 $1,035 $1,288 $845 $143,298 1 Includes $222 million of loans measured at fair value, the majority of which were accruing current. 2 Nonaccruing loans past due 90 days or more totaled $360 million . Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans. Impaired Loans A loan is considered impaired when it is probable that the Company will be unable to collect all amounts due, including principal and interest, according to the contractual terms of the agreement. Commercial nonaccrual loans greater than $3 million and certain commercial and consumer loans whose terms have been modified in a TDR are individually evaluated for impairment. Smaller-balance homogeneous loans that are collectively evaluated for impairment and loans measured at fair value are not included in the following tables. Additionally, the following tables exclude guaranteed student loans and guaranteed residential mortgages for which there was nominal risk of principal loss due to the government guarantee. December 31, 2017 December 31, 2016 (Dollars in millions) Unpaid Principal Balance Carrying Value 1 Related ALLL Unpaid Principal Balance Carrying Value 1 Related ALLL Impaired LHFI with no ALLL recorded: Commercial loans: C&I $38 $35 $— $266 $214 $— Total commercial loans with no ALLL recorded 38 35 — 266 214 — Consumer loans: Residential mortgages - nonguaranteed 458 363 — 466 360 — Residential construction 15 9 — 16 8 — Total consumer loans with no ALLL recorded 473 372 — 482 368 — Impaired LHFI with an ALLL recorded: Commercial loans: C&I 127 117 19 225 151 31 CRE 21 21 2 26 17 2 Total commercial loans with an ALLL recorded 148 138 21 251 168 33 Consumer loans: Residential mortgages - nonguaranteed 1,133 1,103 113 1,277 1,248 150 Residential home equity products 953 895 54 863 795 54 Residential construction 93 90 7 109 107 11 Other direct 59 59 1 59 2 59 2 1 Indirect 123 122 7 103 103 5 Credit cards 26 7 1 24 6 1 Total consumer loans with an ALLL recorded 2,387 2,276 183 2,435 2,318 222 Total impaired LHFI $3,046 $2,821 $204 $3,434 $3,068 $255 1 Carrying value reflects charge-offs that have been recognized plus other amounts that have been applied to adjust the net book balance. 2 Includes $41 million of TDRs that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016. Included in the impaired LHFI carrying values above at December 31, 2017 and 2016 were $2.4 billion and $2.5 billion of accruing TDRs, of which 96% and 97% were current, respectively. See Note 1 , “Significant Accounting Policies,” for further information regarding the Company’s loan impairment policy. Year Ended December 31 2017 2016 2015 (Dollars in millions) Average Carrying Value Interest Income Recognized 1 Average Carrying Value Interest Income Recognized 1 Average Carrying Value Interest Income Recognized 1 Impaired LHFI with no ALLL recorded: Commercial loans: C&I $34 $1 $169 $3 $58 $2 CRE — — — — 10 — Total commercial loans with no ALLL recorded 34 1 169 3 68 2 Consumer loans: Residential mortgages - nonguaranteed 357 15 370 16 390 17 Residential construction 8 — 8 — 11 — Total consumer loans with no ALLL recorded 365 15 378 16 401 17 Impaired LHFI with an ALLL recorded: Commercial loans: C&I 112 2 170 1 147 5 CRE 22 1 25 1 — — Total commercial loans with an ALLL recorded 134 3 195 2 147 5 Consumer loans: Residential mortgages - nonguaranteed 1,123 58 1,251 64 1,349 65 Residential home equity products 914 32 812 29 682 28 Residential construction 94 5 110 6 125 8 Other direct 60 4 10 1 12 — Indirect 136 6 114 6 125 6 Credit cards 6 1 6 1 7 1 Total consumer loans with an ALLL recorded 2,333 106 2,303 107 2,300 108 Total impaired LHFI $2,866 $125 $3,045 $128 $2,916 $132 1 Of the interest income recognized during the years ended December 31, 2017, 2016, and 2015 , cash basis interest income was $4 million , $4 million , and $7 million , respectively. NPAs are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Nonaccrual loans/NPLs: Commercial loans: C&I $215 $390 CRE 24 7 Commercial construction 1 17 Consumer loans: Residential mortgages - nonguaranteed 206 177 Residential home equity products 203 235 Residential construction 11 12 Other direct 7 6 Indirect 7 1 Total nonaccrual loans/NPLs 1 674 845 OREO 2 57 60 Other repossessed assets 10 14 Total NPAs $741 $919 1 Nonaccruing restructured loans are included in total nonaccrual loans /NPLs. 2 Does not include foreclosed real estate related to loans insured by the FHA or guaranteed by the VA . Proceeds due from the FHA and the VA are recorded as a receivable in Other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA and the VA totaled $45 million and $50 million at December 31, 2017 and 2016 , respectively. The Company's recorded investment of nonaccruing loans secured by residential real estate properties for which formal foreclosure proceedings were in process at December 31, 2017 and 2016 was $73 million and $85 million , respectively. The Company's recorded investment of accruing loans secured by residential real estate properties for which formal foreclosure proceedings were in process at December 31, 2017 and 2016 was $101 million and $122 million , of which $97 million and $114 million were insured by the FHA or guaranteed by the VA , respectively. At December 31, 2017 , OREO included $51 million of foreclosed residential real estate properties and $4 million of foreclosed commercial real estate properties, with the remaining $2 million related to land. At December 31, 2016 , OREO included $50 million of foreclosed residential real estate properties and $7 million of foreclosed commercial real estate properties, with the remaining $3 million related to land. Restructured Loans A TDR is a loan for which the Company has granted an economic concession to a borrower in response to certain instances of financial difficulty experienced by the borrower, which the Company would not have considered otherwise. When a loan is modified under the terms of a TDR, the Company typically offers the borrower an extension of the loan maturity date and/or a reduction in the original contractual interest rate. In limited situations, the Company may offer to restructure a loan in a manner that ultimately results in the forgiveness of a contractually specified principal balance. At December 31, 2017 and 2016 , the Company had $2 million and $29 million , respectively, of commitments to lend additional funds to debtors whose terms have been modified in a TDR. The number and carrying value of loans modified under the terms of a TDR, by type of modification, are presented in the following tables: Year Ended December 31, 2017 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 178 $3 $43 $46 Consumer loans: Residential mortgages - nonguaranteed 150 22 10 32 Residential home equity products 2,488 45 176 221 Other direct 661 — 9 9 Indirect 2,740 — 61 61 Credit cards 919 4 — 4 Total TDR additions 7,136 $74 $299 $373 1 Includes loans modified under the terms of a TDR that were charged-off during the period. Year Ended December 31, 2016 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 84 $2 $68 $70 Commercial construction 1 — — — Consumer loans: Residential mortgages - nonguaranteed 397 79 12 91 Residential home equity products 2,611 9 227 236 Residential construction 1 — — — Other direct 2 3,925 — 50 50 Indirect 1,539 — 32 32 Credit cards 720 3 — 3 Total TDR additions 9,278 $93 $389 $482 1 Includes loans modified under the terms of a TDR that were charged-off during the period. 2 Includes 3,321 loans with a carrying value of $41 million that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016. Year Ended December 31, 2015 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 57 $1 $3 $4 CRE 2 — — — Commercial construction 1 — — — Consumer loans: Residential mortgages - nonguaranteed 737 125 34 159 Residential home equity products 1,888 24 108 132 Residential construction 4 5 — 5 Other direct 54 — 1 1 Indirect 2,299 — 47 47 Credit cards 557 2 — 2 Total TDR additions 5,599 $157 $193 $350 1 Includes loans modified under the terms of a TDR that were charged-off during the period. TDRs that defaulted during the years ended December 31, 2017, 2016, and 2015 , which were first modified within the previous 12 months, were immaterial. The majority of lo ans that were modified under the terms of a TDR and subsequently became 90 days or more delinquent have remained on nonaccrual status since the time of delinquency. Concentrations of Credit Risk The Company does not have a significant concentration of credit risk to any individual client except for the U.S. government and its agencies. However, a geographic concentration arises because the Company operates primarily within Florida, Georgia, Virginia, Maryland, and North Carolina . The Company engages in limited international banking activities. The Company’s total cross-border outstanding loans were $1.4 billion and $2.2 billion at December 31, 2017 and 2016 , respectively. With respect to collateral concentration, the Company's recorded investment in residential real estate secured LHFI totaled $38.6 billion at December 31, 2017 and represented 27% of total LHFI. At December 31, 2016 , the Company's recorded investment in residential real estate secured LHFI totaled $39.0 billion and represented 27% of total LHFI. Additionally, at December 31, 2017 and 2016 , the Company had $10.1 billion and $10.3 billion in commitments to extend credit on home equity lines and $3.0 billion and $4.2 billion in residential mortgage commitments outstanding, respectively. At both December 31, 2017 and December 31, 2016 , 1% of the Company's residential real estate secured LHFI were insured by the FHA or guaranteed by the VA , respectively. The following table presents residential mortgage LHFI that included a high original LTV ratio (in excess of 80%), an interest only feature, and/or a second lien position that may increase the Company's exposure to credit risk and/or result in a concentration of credit risk. At December 31, 2017 and 2016 , the current weighted average FICO score for the borrowers of these residential mortgage LHFI was 756 and 751 , respectively. (Dollars in millions) December 31, 2017 December 31, 2016 Interest only mortgages with MI or with combined original LTV ≤ 80% 1 $569 $845 Interest only mortgages with no MI and with combined original LTV > 80% 1 77 279 Total interest only mortgages 1 646 1,124 Amortizing mortgages with combined original LTV > 80% and/or second liens 2 10,197 9,198 Total mortgages with potential concentration of credit risk $10,843 $10,322 1 Comprised of first and/or second liens, primarily with an initial 10 year interest only period. 2 Comprised of loans with no MI .

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2017
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses	NOTE 7 - ALLOWANCE FOR CREDIT LOSSES The allowance for credit losses consists of the ALLL and the unfunded commitments reserve. Activity in the allowance for credit losses is summarized in the following table: Year Ended December 31 (Dollars in millions) 2017 2016 2015 Balance, beginning of period $1,776 $1,815 $1,991 Provision for loan losses 397 440 156 Provision for unfunded commitments 12 4 9 Loan charge-offs (491 ) (591 ) (470 ) Loan recoveries 124 108 129 Other 1 (4 ) — — Balance, end of period $1,814 $1,776 $1,815 Components: ALLL $1,735 $1,709 $1,752 Unfunded commitments reserve 2 79 67 63 Allowance for credit losses $1,814 $1,776 $1,815 1 Related to loans disposed in connection with the sale of PAC . For additional information regarding the sale of PAC , see Note 2 , "Acquisitions/Dispositions." 2 The unfunded commitments reserve is recorded in Other liabilities in the Consolidated Balance Sheets. Activity in the ALLL by loan segment is presented in the following tables: Year Ended December 31, 2017 (Dollars in millions) Commercial Loans Consumer Loans Total Balance, beginning of period $1,124 $585 $1,709 Provision for loan losses 108 289 397 Loan charge-offs (167 ) (324 ) (491 ) Loan recoveries 40 84 124 Other 1 (4 ) — (4 ) Balance, end of period $1,101 $634 $1,735 Year Ended December 31, 2016 (Dollars in millions) Commercial Loans Consumer Loans Total Balance, beginning of period $1,047 $705 $1,752 Provision for loan losses 329 111 440 Loan charge-offs (287 ) (304 ) (591 ) Loan recoveries 35 73 108 Balance, end of period $1,124 $585 $1,709 1 Related to loans disposed in connection with the sale of PAC . For additional information regarding the sale of PAC , see Note 2 , "Acquisitions/Dispositions." As discussed in Note 1 , “Significant Accounting Policies,” the ALLL is composed of both specific allowances for certain nonaccrual loans and TDRs, and general allowances for groups of loans with similar risk characteristics. No allowance is required for loans measured at fair value. Additionally, the Company records an immaterial allowance for loan products that are insured by federal agencies or guaranteed by GSE s, as there is nominal risk of principal loss. The Company’s LHFI portfolio and related ALLL is presented in the following tables: December 31, 2017 Commercial Loans Consumer Loans Total (Dollars in millions) Carrying Value Related ALLL Carrying Value Related Carrying Value Related LHFI evaluated for impairment: Individually evaluated $173 $21 $2,648 $183 $2,821 $204 Collectively evaluated 75,304 1,080 64,860 451 140,164 1,531 Total evaluated 75,477 1,101 67,508 634 142,985 1,735 LHFI measured at fair value — — 196 — 196 — Total LHFI $75,477 $1,101 $67,704 $634 $143,181 $1,735 December 31, 2016 Commercial Loans Consumer Loans Total (Dollars in millions) Carrying Related ALLL Carrying Related Carrying Related LHFI evaluated for impairment: Individually evaluated $382 $33 $2,686 $222 $3,068 $255 Collectively evaluated 77,842 1,091 62,166 363 140,008 1,454 Total evaluated 78,224 1,124 64,852 585 143,076 1,709 LHFI measured at fair value — — 222 — 222 — Total LHFI $78,224 $1,124 $65,074 $585 $143,298 $1,709

Premises and Equipment Property

Premises and Equipment Property Plant And Equipment (Notes)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	NOTE 8 - PREMISES AND EQUIPMENT Premises and equipment at December 31 consisted of the following: (Dollars in millions) Useful Life (in years) 2017 2016 Land Indefinite $321 $320 Buildings and improvements 1 - 40 1,047 1,028 Leasehold improvements 1 - 30 691 645 Furniture and equipment 1 - 20 1,430 1,492 Construction in progress 488 357 Total premises and equipment 3,977 3,842 Less: Accumulated depreciation and amortization 2,243 2,286 Premises and equipment, net $1,734 $1,556 None of the Company's premises and equipment was subject to mortgage indebtedness (included in long-term debt) at December 31, 2017 and 2016 . Capital leases included in net premises and equipment was immaterial at both December 31, 2017 and 2016 . Aggregate rent expense (principally for offices), including any contingent rent expense and sublease income, totaled $201 million , $202 million , and $200 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Depreciation and amortization expense on premises and equipment for the years ended December 31, 2017, 2016, and 2015 totaled $175 million , $179 million , and $175 million , respectively. The Company previously completed sale-leaseback transactions consisting of branch properties and various individual office buildings. Upon completion of these transactions, the Company recognized a portion of the resulting gains and deferred the remainder to be recognized ratably over the expected term of the lease, predominantly 10 years, as an offset to net occupancy expense. To the extent that terms on these leases are extended, the remaining deferred gain would be amortized over the new lease term. Amortization of deferred gains on sale-leaseback transactions was $17 million , $43 million , and $54 million for the years ended December 31, 2017, 2016, and 2015 , respectively. At December 31, 2017 and 2016 , the remaining deferred gain associated with sale-leaseback transactions was $49 million and $67 million , respectively. The Company has various obligations under capital leases and noncancelable operating leases for premises and equipment. The leases predominantly expire over the next 21 years, with the longest lease term having an expiration date in 2081 . Many of these leases include a renewal option and some provide for periodic adjustment of rentals based on changes in various economic indicators. The following table presents future minimum payments under noncancelable operating leases, net of sublease rentals, with initial terms in excess of one year at December 31, 2017 . (Dollars in millions) Operating Leases 2018 $205 2019 199 2020 179 2021 167 2022 151 Thereafter 657 Total minimum lease payments $1,558

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 9 – GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill As discussed in Note 20 , "Business Segment Reporting," the Company realigned its business segment structure from three segments to two segments in the second quarter of 2017. As a result, the Company reassessed the composition of its goodwill reporting units and combined the Consumer Banking and Private Wealth Management reporting unit and Mortgage Banking reporting unit into a single Consumer goodwill reporting unit. The Mortgage Banking reporting unit did not have any associated goodwill prior to this change. The composition of the Wholesale Banking reporting unit was not impacted by the business segment structure realignment. The Company conducts a goodwill impairment test at the reporting unit level at least annually, or more frequently as events occur or circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying amount. See Note 1 , "Significant Accounting Policies," for additional information regarding the Company's goodwill accounting policy. The Company performed goodwill impairment analyses for its Wholesale and Consumer reporting units as of October 1, 2017, 2016, and 2015. Based on the results of the impairment analyses, the Company concluded that the fair values of the reporting units exceed their respective carrying values; therefore, there was no goodwill impairment. The Company monitored events and circumstances during the fourth quarter of 2017 and did not observe any factors that would more-likely-than-not reduce the fair value of a reporting unit below its respective carrying value. Changes in the carrying amount of goodwill by reportable segment for the year ended December 31, 2017 are presented in the following table. There were no material changes in the carrying amount of goodwill by reportable segment for the year ended December 31, 2016 . (Dollars in millions) Consumer Wholesale Total Balance, January 1, 2017 $4,262 $2,075 $6,337 Measurement period adjustment related to the acquisition of Pillar — 1 1 Sale of PAC — (7 ) (7 ) Balance, December 31, 2017 $4,262 $2,069 $6,331 Other Intangible Assets Changes in the carrying amounts of other intangible assets for the years ended December 31 are presented in the following table: (Dollars in millions) Residential MSRs - Fair Value Commercial Mortgage Servicing Rights and Other Total Balance, January 1, 2017 $1,572 $85 $1,657 Amortization 1 — (20 ) (20 ) Servicing rights originated 394 17 411 Changes in fair value: Due to changes in inputs and assumptions 2 (22 ) — (22 ) Other changes in fair value 3 (226 ) — (226 ) Servicing rights sold (8 ) — (8 ) Other 4 — (1 ) (1 ) Balance, December 31, 2017 $1,710 $81 $1,791 Balance, January 1, 2016 $1,307 $18 $1,325 Amortization 1 — (9 ) (9 ) Servicing rights originated 312 — 312 Servicing rights purchased 200 — 200 Servicing rights acquired in Pillar acquisition — 62 62 Other intangible assets acquired in Pillar acquisition 5 — 14 14 Changes in fair value: Due to changes in inputs and assumptions 2 (13 ) — (13 ) Other changes in fair value 3 (232 ) — (232 ) Servicing rights sold (2 ) — (2 ) Balance, December 31, 2016 $1,572 $85 $1,657 1 Does not include expense associated with non-qualified community development investments. See Note 10 , "Certain Transfers of Financial Assets and Variable Interest Entities," for additional information. 2 Primarily reflects changes in option adjusted spreads and prepayment speed assumptions, due to changes in interest rates. 3 Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time. 4 Represents the first quarter of 2017 measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition. 5 The majority of other intangible assets acquired from Pillar relate to indefinite-lived agency licenses. The gross carrying amount and accumulated amortization of other intangible assets are presented in the following table: December 31, 2017 December 31, 2016 (Dollars in millions) Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value Amortized other intangible assets 1 : Commercial mortgage servicing rights $79 ($14 ) $65 $62 $— $62 Other (definite-lived) 32 (28 ) 4 35 (22 ) 13 Unamortized other intangible assets: Residential MSRs (carried at fair value) 1,710 — 1,710 1,572 — 1,572 Other (indefinite-lived) 12 — 12 10 — 10 Total other intangible assets $1,833 ($42 ) $1,791 $1,679 ($22 ) $1,657 1 Excludes fully amortized other intangible assets. The Company's estimated future amortization of intangible assets at December 31, 2017 is presented in the following table: (Dollars in millions) 2018 $13 2019 10 2020 9 2021 8 2022 6 Thereafter 23 Total 1 $69 1 Does not include indefinite-lived intangible assets of $12 million . Servicing Rights The Company acquires servicing rights and retains servicing rights for certain of its sales or securitizations of residential mortgages and commercial loans. MSRs on residential mortgages and servicing rights on commercial mortgages are the only material servicing assets capitalized by the Company and are classified as Other intangible assets on the Company's Consolidated Balance Sheets. Residential Mortgage Servicing Rights Income earned by the Company on its residential MSRs is derived primarily from contractually specified mortgage servicing fees and late fees, net of curtailment costs. Such income earned for the years ended December 31, 2017, 2016, and 2015 totaled $403 million , $366 million , and $347 million , respectively. These amounts are reported in Mortgage servicing related income in the Consolidated Statements of Income. At December 31, 2017 and 2016 , the total UPB of residential mortgage loans serviced was $165.5 billion and $160.2 billion , respectively. Included in these amounts at December 31, 2017 and 2016 were $136.1 billion and $129.6 billion , respectively, of loans serviced for third parties. The Company purchased MSRs on residential loans with a UPB of $19.7 billion during the year ended December 31, 2016 . No MSRs on residential loans were purchased during the year ended December 31, 2017 . During the years ended December 31, 2017 and 2016 , the Company sold MSRs on residential loans, at a price approximating their fair value, with a UPB of $1.1 billion and $575 million , respectively. The Company measures the fair value of its residential MSRs using a valuation model that calculates the present value of estimated future net servicing income using prepayment projections, spreads, and other assumptions. The Consumer Valuation Committee reviews and approves all significant assumption changes at least quarterly, evaluating these inputs compared to various market and empirical data sources. Changes to valuation model inputs are reflected in the periods' results. See Note 18 , “Fair Value Election and Measurement,” for further information regarding the Company's residential MSR valuation methodology. A summary of the key inputs used to estimate the fair value of the Company’s residential MSRs at December 31, 2017 and 2016 , and the sensitivity of the fair values to immediate 10% and 20% adverse changes in those inputs, are presented in the following table. (Dollars in millions) December 31, 2017 December 31, 2016 Fair value of residential MSRs $1,710 $1,572 Prepayment rate assumption (annual) 13 % 9 % Decline in fair value from 10% adverse change $85 $50 Decline in fair value from 20% adverse change 160 97 Option adjusted spread (annual) 4 % 8 % Decline in fair value from 10% adverse change $47 $63 Decline in fair value from 20% adverse change 90 122 Weighted-average life (in years) 5.4 7.0 Weighted-average coupon 3.9 % 4.0 % These residential MSR sensitivities are hypothetical and should be used with caution. Changes in fair value based on variations in assumptions generally cannot be extrapolated because (i) the relationship of the change in an assumption to the change in fair value may not be linear and (ii) changes in one assumption may result in changes in another, which might magnify or counteract the sensitivities. The sensitivities do not reflect the effect of hedging activity undertaken by the Company to offset changes in the fair value of MSRs. See Note 17 , “Derivative Financial Instruments,” for further information regarding these hedging activities. Commercial Mortgage Servicing Rights In December 2016, the Company completed the acquisition of substantially all of the assets of the operating subsidiaries of Pillar , and as a result, the Company recognized a $62 million servicing asset. Income earned by the Company on its commercial mortgage servicing rights is derived primarily from contractually specified servicing fees and other ancillary fees. Such income earned for the year ended December 31, 2017 totaled $22 million and is reported in Commercial real estate related income in the Consolidated Statements of Income. Income earned on commercial mortgage servicing rights for the year ended December 31, 2016 was immaterial and there was no such income earned for the year ended December 31, 2015 . The Company also earns income from subservicing certain third party commercial mortgages for which the Company does not record servicing rights. Such income earned for the year ended December 31, 2017 totaled $14 million and is reported in Commercial real estate related income in the Consolidated Statements of Income. Income earned from such subservicing arrangements for the year ended December 31, 2016 was immaterial and there was no such income earned for the year ended December 31, 2015 . At December 31, 2017 and 2016 , the total UPB of commercial mortgage loans serviced for third parties was $30.1 billion and $27.7 billion , respectively. Included in these amounts at December 31, 2017 and 2016 were $5.8 billion and $4.8 billion , respectively, of loans serviced for third parties for which the Company records servicing rights, and $24.3 billion and $22.9 billion , respectively, of loans subserviced for third parties for which the Company does not record servicing rights. No commercial mortgage servicing rights were purchased or sold during the years ended December 31, 2017 and 2016 (other than those that were acquired as part of the Pillar acquisition). Commercial mortgage servicing rights are accounted for at amortized cost and are monitored for impairment on an ongoing basis. The Company calculates the fair value of commercial servicing rights based on the present value of estimated future net servicing income, considering prepayment projections and other assumptions. Impairment, if any, is recognized when the carrying value of the servicing asset exceeds the fair value at the measurement date. The amortized cost of the Company's commercial mortgage servicing rights were $65 million and $62 million at December 31, 2017 and December 31, 2016 , respectively. A summary of the key inputs used to estimate the fair value of the Company’s commercial mortgage servicing rights are presented in the following table. (Dollars in millions) December 31, 2017 December 31, 2016 Fair value of commercial mortgage servicing rights $75 $62 Discount rate (annual) 12 % 12 % Prepayment rate assumption (annual) 7 6 Float earnings rate (annual) 1.1 0.5 Weighted-average life (in years) 7.0 7.0

Borrowings and Contractual Comm

Borrowings and Contractual Commitments (Notes)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	NOTE 11 - BORROWINGS AND CONTRACTUAL COMMITMENTS Short-term Borrowings Short-term borrowings at December 31 consisted of the following: 2017 2016 (Dollars in millions) Balance Interest Rate Balance Interest Rate Funds purchased $2,561 1.33 % $2,116 0.55 % Securities sold under agreements to repurchase 1,503 1.39 1,633 0.55 Other short-term borrowings 717 1.00 1,015 0.56 Total short-term borrowings $4,781 $4,764 Long-term Debt Long-term debt at December 31 consisted of the following: 2017 2016 (Dollars in millions) Maturity Date(s) Interest Rate(s) Balance Balance Parent Company Only: Senior, fixed rate 2018 - 2028 2.35% - 6.00% $3,379 $3,818 Senior, variable rate 2018 - 2019 0.25 - 1.53 267 314 Subordinated, fixed rate 2026 6.00 200 200 Junior subordinated, variable rate 2027 - 2028 2.09 - 2.32 628 627 Total 4,474 4,959 Less: Debt issuance costs 8 9 Total Parent Company debt 4,466 4,950 Subsidiaries 1 : Senior, fixed rate 2 2018 - 2057 0.80 - 9.10 3,609 2,539 Senior, variable rate 2020 - 2043 1.04 - 1.84 512 2,613 Subordinated, fixed rate 2018 - 2026 3.30 - 7.25 1,206 1,651 Total 5,327 6,803 Less: Debt issuance costs 8 5 Total subsidiaries debt 5,319 6,798 Total long-term debt 3 $9,785 $11,748 1 77% and 88% of total subsidiary debt was issued by the Bank as of December 31, 2017 and 2016 , respectively. 2 Includes leases and other obligations that do not have a stated interest rate. 3 Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016 , respectively. The Company had no foreign denominated debt outstanding at December 31, 2017 or 2016 . Maturities of long-term debt at December 31, 2017 were as follows: (Dollars in millions) Parent Company Subsidiaries 2018 $874 $361 2019 792 27 2020 — 1,508 2021 965 4 2022 990 1,022 Thereafter 853 2,405 Total maturities 4,474 5,327 Less: Debt issuance costs 8 8 Total long-term debt $4,466 $5,319 During 2017 , the Bank (i) issued $1.0 billion of 3-year fixed rate senior notes, (ii) issued $300 million of 3-year floating rate senior notes, and (iii) issued $1.0 billion of 5-year fixed rate senior notes under its Global Bank Note program. Additionally, $2.8 billion of the Company's long-term FHLB advances were terminated or matured during the year. Furthermore, $1.5 billion of senior notes and $188 million of subordinated notes matured during 2017 . The Company had no additional material issuances, advances, repurchases, terminations, or extinguishments of long-term debt during the year. Restrictive provisions of several long-term debt agreements prevent the Company from creating liens on, disposing of, or issuing (except to related parties) voting stock of subsidiaries. Furthermore, there are restrictions on mergers, consolidations, certain leases, sales or transfers of assets, minimum shareholders’ equity, and maximum borrowings by the Company. At December 31, 2017 , the Company was in compliance with all covenants and provisions of long-term debt agreements. As currently defined by federal bank regulators, long-term debt of $1.6 billion and $1.7 billion qualified as Tier 2 capital at December 31, 2017 and 2016 , respectively. See Note 13 , "Capital," for additional information regarding regulatory capital adequacy requirements for the Company and the Bank. The Company does not consolidate certain wholly-owned trusts which were formed for the sole purpose of issuing trust preferred securities. The proceeds from the trust preferred securities issuances were invested in junior subordinated debentures of the Parent Company. The obligations of these debentures constitute a full and unconditional guarantee by the Parent Company of the trust preferred securities. Contractual Commitments In the normal course of business, the Company enters into certain contractual commitments. These commitments include obligations to make future payments on the Company's borrowings, partnership investments, and lease arrangements, as well as commitments to lend to clients and to fund capital expenditures and service contracts. The following table presents the Company's significant contractual commitments at December 31, 2017 , except for long-term debt and short-term borrowings, operating leases, and pension and other postretirement benefit plans. Information on those obligations is included above, in Note 8 , "Premises and Equipment," and in Note 15 , "Employee Benefit Plans." Capital lease obligations were immaterial at December 31, 2017 and are not presented in the table. Payments Due by Period (Dollars in millions) 2018 2019 2020 2021 2022 Thereafter Total Unfunded lending commitments $25,265 $9,648 $13,773 $13,380 $15,879 $12,066 $90,011 Purchase obligations 1 278 260 76 50 48 247 959 Consumer and other time deposits 2, 3 4,720 2,559 1,331 617 834 2,015 12,076 Brokered time deposits 3 105 181 251 194 178 76 985 Commitments to fund partnership investments 4 690 — — — — — 690 1 For legally binding purchase obligations of $5 million or more, amounts include either termination fees under the associated contracts when early termination provisions exist, or the total potential obligation over the full contractual term for noncancelable purchase obligations. Payments made towards the purchase of goods or services under these contracts totaled $395 million , $236 million , and $243 million in 2017, 2016, and 2015 , respectively. 2 The aggregate amount of time deposit accounts in denominations of $250,000 or more was $3.2 billion and $1.7 billion at December 31, 2017 and 2016 , respectively. 3 Amounts do not include interest. 4 Commitments to fund investments in affordable housing and other partnerships do not have defined funding dates as certain criteria must be met before the Company is obligated to fund. Accordingly, these commitments are considered to be due on demand for presentation purposes. See Note 10 , "Certain Transfers of Financial Assets and Variable Interest Entities," in this Form 10-K for additional information.

Certain Transfers of Financial

Certain Transfers of Financial Assets and Variable Interest Entities	12 Months Ended
	Dec. 31, 2017
Certain Transfers of Financial Assets and Variable Interest Entities [Abstract]
Transfers and Servicing of Financial Assets [Text Block]	NOTE 10 - CERTAIN TRANSFERS OF FINANCIAL ASSETS AND VARIABLE INTEREST ENTITIES The Company has transferred loans and securities in sale or securitization transactions for which the Company retains certain beneficial interests, servicing rights, and/or recourse. These transfers of financial assets include certain residential mortgage loans, guaranteed student loans, and commercial and corporate loans, as discussed in the following section, "Transfers of Financial Assets." Cash receipts on beneficial interests held related to these transfers were $11 million , $12 million and $19 million for the years ended December 31, 2017, 2016, and 2015 , respectively. The servicing fees related to these asset transfers (excluding servicing fees for residential and commercial mortgage loan transfers to GSE s, which are discussed in Note 9 , “Goodwill and Other Intangible Assets”) were immaterial for each of the years ended December 31, 2017, 2016, and 2015 . When a transfer or other transaction occurs with a VIE, the Company first determines whether it has a VI in the VIE. A VI is typically in the form of securities representing retained interests in transferred assets and, at times, servicing rights, and for commercial mortgage loans sold to Fannie Mae , the loss share guarantee. When determining whether to consolidate the VIE, the Company evaluates whether it is a primary beneficiary which has both (i) the power to direct the activities that most significantly impact the economic performance of the VIE, and (ii) the obligation to absorb losses, or the right to receive benefits, that could potentially be significant to the VIE . To determine whether a transfer should be accounted for as a sale or a secured borrowing, the Company evaluates whether: (i) the transferred assets are legally isolated, (ii) the transferee has the right to pledge or exchange the transferred assets, and (iii) the Company has relinquished effective control of the transferred assets. If all three conditions are met, then the transfer is accounted for as a sale. Except as specifically noted herein, the Company is not required to provide additional financial support to any of the entities to which the Company has transferred financial assets, nor has the Company provided any support it was not otherwise obligated to provide. No events occurred during the year ended December 31, 2017 that changed the Company’s previous conclusions regarding whether it is the primary beneficiary of the VIEs described herein. Furthermore, no events occurred during the year ended December 31, 2017 that changed the Company’s sale conclusion with regards to previously transferred residential mortgage loans, guaranteed student loans, or commercial and corporate loans. Transfers of Financial Assets The following discussion summarizes transfers of financial assets to entities for which the Company has retained some level of continuing involvement. Consumer Loans Residential Mortgage Loans The Company typically transfers first lien residential mortgage loans in conjunction with Ginnie Mae , Fannie Mae , and Freddie Mac securitization transactions, whereby the loans are exchanged for cash or securities that are readily redeemable for cash, and servicing rights are retained. The Company sold residential mortgage loans to Ginnie Mae , Fannie Mae , and Freddie Mac , which resulted in pre-tax net gains of $213 million , $331 million , and $232 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Net gains/losses on the sale of residential mortgage LHFS are recorded at inception of the associated IRLCs and reflect the change in value of the loans resulting from changes in interest rates from the time the Company enters into the related IRLCs with borrowers until the loans are sold, but do not include the results of hedging activities initiated by the Company to mitigate this market risk. See Note 17 , "Derivative Financial Instruments," for further discussion of the Company's hedging activities. The Company has made certain representations and warranties with respect to the transfer of these loans. See Note 16 , “Guarantees,” for additional information regarding representations and warranties. In a limited number of securitizations, the Company has received securities in addition to cash in exchange for the transferred loans, while also retaining servicing rights. The securities received are measured at fair value and classified as securities AFS. At December 31, 2017 and 2016 , the fair value of securities received totaled $22 million and $30 million , respectively. The Company evaluates securitization entities in which it has a VI for potential consolidation under the VIE consolidation model. Notwithstanding the Company's role as servicer, the Company typically does not have power over the securitization entities as a result of rights held by the master servicer. In certain transactions, the Company does have power as the servicer, but does not have an obligation to absorb losses, or the right to receive benefits, that could potentially be significant. In all such cases, the Company does not consolidate the securitization entity. Total assets of the unconsolidated entities in which the Company has a VI were $147 million and $203 million at December 31, 2017 and 2016 , respectively. The Company’s maximum exposure to loss related to these unconsolidated residential mortgage loan securitizations is comprised of the loss of value of any interests it retains, which was $22 million and $30 million at December 31, 2017 and 2016 , respectively, and any repurchase obligations or other losses it incurs as a result of any guarantees related to these securitizations, which is discussed further in Note 16 , “Guarantees.” Guaranteed Student Loans The Company has securitized government-guaranteed student loans through a transfer of loans to a securitization entity and retained the residual interest in the entity. The Company concluded that this entity should be consolidated because the Company has (i) the power to direct the activities that most significantly impact the economic performance of the VIE and (ii) the obligation to absorb losses, and the right to receive benefits, that could potentially be significant. At December 31, 2017 and 2016 , the Company’s Consolidated Balance Sheets reflected $192 million and $225 million of assets held by the securitization entity and $189 million and $222 million of debt issued by the entity, respectively, inclusive of related accrued interest. To the extent that the securitization entity incurs losses on its assets, the securitization entity has recourse to the guarantor of the underlying loan, which is backed by the Department of Education up to a maximum guarantee of 98% , or in the event of death, disability, or bankruptcy, 100% . When not fully guaranteed, losses reduce the amount of available cash payable to the Company as the owner of the residual interest. To the extent that losses result from a breach of servicing responsibilities, the Company, which functions as the master servicer, may be required to repurchase the defaulted loan(s) at par value. If the breach was caused by the subservicer, the Company would seek reimbursement from the subservicer up to the guaranteed amount. The Company’s maximum exposure to loss related to the securitization entity would arise from a breach of its servicing responsibilities. To date, loss claims filed with the guarantor that have been denied due to servicing errors have either been, or are in the process of, being cured, or reimbursement has been provided to the Company by the subservicer, or in limited cases, absorbed by the Company. Commercial and Corporate Loans In connection with the Pillar acquisition completed in December 2016, the Company acquired licenses and approvals to originate and sell certain commercial mortgage loans to Fannie Mae and Freddie Mac , to originate FHA insured loans, and to issue and sell Ginnie Mae commercial MBS secured by FHA insured loans. The Company transferred commercial loans to these Agencies and GSE s, which resulted in pre-tax net gains of $37 million for the year ended December 31, 2017 . No associated gains or losses were recognized for the year ended December 31, 2016 . The loans are exchanged for cash or securities that are readily redeemable for cash, with servicing rights retained. The Company has made certain representations and warranties with respect to the transfer of these loans and has entered into a loss share guarantee related to certain loans transferred to Fannie Mae . See Note 16 , “Guarantees,” for additional information regarding the commercial mortgage loan loss share guarantee. The Company's total managed loans, including the LHFI portfolio and other transferred loans (securitized and unsecuritized), are presented in the following table by portfolio balance and delinquency status (accruing loans 90 days or more past due and all nonaccrual loans) at December 31, 2017 and 2016 , as well as the related net charge-offs for the years ended December 31, 2017 and 2016 . Portfolio Balance Past Due and Nonaccrual Net Charge-offs December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Year Ended December 31 (Dollars in millions) 2017 2016 LHFI portfolio: Commercial $75,477 $78,224 $247 $426 $127 $252 Consumer 67,704 65,074 1,832 1,707 240 231 Total LHFI portfolio 143,181 143,298 2,079 2,133 367 483 Managed securitized loans 1 : Commercial 2 5,760 4,761 — — — — Consumer 134,160 127,153 171 115 8 3 11 3 Total managed securitized loans 139,920 131,914 171 115 8 11 Managed unsecuritized loans 4 2,200 2,985 340 438 — — Total managed loans $285,301 $278,197 $2,590 $2,686 $375 $494 1 Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments). 2 Comprised of commercial mortgages sold through Fannie Mae , Freddie Mac , and Ginnie Mae securitizations, whereby servicing has been retained by the Company. 3 Amounts associated with $602 million and $922 million of managed securitized loans at December 31, 2017 and 2016 , respectively. Net charge-off data is not reported to the Company for the remaining balance of $133.6 billion and $126.2 billion of managed securitized loans at December 31, 2017 and 2016 , respectively. 4 Comprised of unsecuritized loans the Company originated and sold to private investors with servicing rights retained. Net charge-offs on these loans are not presented in the table as the data is not reported to the Company by the private investors that own these related loans. Other Variable Interest Entities In addition to exposure to VIEs arising from transfers of financial assets, the Company also has involvement with VIEs from other business activities. Total Return Swaps The Company facilitates matched book TRS transactions on behalf of clients, whereby a VIE purchases reference assets identified by a client and the Company enters into a TRS with the VIE, with a mirror-image TRS facing the client. The TRS contract between the VIE and the Company hedges the Company's exposure to the TRS contract with its third party client. The Company provides senior financing to the VIE, in the form of demand notes to fund the purchase of the reference assets. The TRS contracts pass through interest and other cash flows on the reference assets to the third party clients, along with exposing those clients to decreases in value on the assets and providing them with the rights to appreciation on the assets. The terms of the TRS contracts require the third parties to post initial margin collateral, in addition to ongoing margin as the fair values of the underlying reference assets change. The Company evaluated the related VIEs for consolidation, noting that the Company and its third party clients are VI holders. The Company evaluated the nature of all VI s and other interests and involvement with the VIEs, in addition to the purpose and design of the VIEs, relative to the risks they were designed to create. The VIEs were designed for the benefit of the third parties and would not exist if the Company did not enter into the TRS contracts on their behalf. The activities of the VIEs are restricted to buying and selling the reference assets and the risks/benefits of any such assets owned by the VIEs are passed to the third party clients via the TRS contracts. The Company determined that it is not the primary beneficiary of the VIEs, as the design of its matched book TRS business results in the Company having no substantive power to direct the significant activities of the VIEs, and therefore, the VIEs are not consolidated. At December 31, 2017 and 2016 , the outstanding notional amounts of the Company's VIE-facing TRS contracts were $1.7 billion and $2.1 billion , and related senior financing outstanding to VIEs were $1.7 billion and $2.1 billion , respectively. These financings were measured at fair value and classified within Trading assets and derivative instruments on the Consolidated Balance Sheets. The Company entered into client-facing TRS contracts of the same outstanding notional amounts. The notional amounts of the TRS contracts with VIEs represent the Company’s maximum exposure to loss, although this exposure has been mitigated via the TRS contracts with third party clients. For additional information on the Company’s TRS contracts and its involvement with these VIEs, see Note 17 , “Derivative Financial Instruments.” Community Development Investments As part of its community reinvestment initiatives, the Company invests in multi-family affordable housing developments and other community development entities as a limited partner and/or a debt provider. The Company receives tax credits for its limited partner investments. The Company has determined that the majority of the related partnerships are VIEs. The Company has concluded that it is not the primary beneficiary of affordable housing partnerships when it invests as a limited partner and there is a third party general partner. The investments are accounted for in accordance with the accounting guidance for investments in affordable housing projects. The general partner, or an affiliate of the general partner, often provides guarantees to the limited partner, which protects the Company from construction and operating losses and tax credit allocation deficits. Assets of $2.3 billion and $1.7 billion in these and other community development partnerships were not included in the Consolidated Balance Sheets at December 31, 2017 and 2016 , respectively. The Company's limited partner interests had carrying values of $1.1 billion and $780 million at December 31, 2017 and 2016 , respectively, and are recorded in Other assets on the Company’s Consolidated Balance Sheets. The Company’s maximum exposure to loss for these investments totaled $1.4 billion and $1.1 billion at December 31, 2017 and 2016 , respectively. The Company’s maximum exposure to loss would result from the loss of its limited partner investments, net of liabilities, along with $350 million and $306 million of loans, interest-rate swap fair value exposures, or letters of credit issued by the Company to the entities at December 31, 2017 and 2016 , respectively. The remaining exposure to loss is primarily attributable to unfunded equity commitments that the Company is required to fund if certain conditions are met. The Company also owns noncontrolling interests in funds whose purpose is to invest in community developments. At December 31, 2017 and 2016 , the Company's investment in these funds totaled $278 million and $200 million , respectively. The Company's maximum exposure to loss on its investment in these funds is comprised of its equity investments in the funds, loans issued, and any additional unfunded equity commitments, which totaled $643 million and $562 million at December 31, 2017 and 2016 , respectively . During the years ended December 31, 2017, 2016, and 2015 , the Company recognized $108 million , $92 million , and 68 million of tax credits for qualified affordable housing projects, and $109 million , $87 million , and $66 million of amortization on these qualified affordable housing projects, respectively. These tax credits and amortization, net of the related tax benefits, are recorded in the Provision for income taxes. Certain of the Company's community development investments do not qualify as affordable housing projects for accounting purposes. The Company recognized tax credits for these investments of $90 million , $64 million , and $53 million during the years ended December 31, 2017, 2016, and 2015 , respectively, in the Provision for income taxes. Amortization recognized on these investments totaled $70 million , $46 million , and $35 million during the years ended December 31, 2017, 2016, and 2015 , respectively, recorded in Amortization in the Company's Consolidated Statements of Income.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Income/(Loss) Per Share	NOTE 12 – NET INCOME PER COMMON SHARE Equivalent shares of 1 million and 14 million related to common stock options and common stock warrants outstanding at December 31, 2016 and 2015 , respectively, were excluded from the computations of diluted net income per average common share because they would have been anti-dilutive. Reconciliations of net income to net income available to common shareholders and the difference between average basic common shares outstanding and average diluted common shares outstanding are presented in the following table. Year Ended December 31 (Dollars and shares in millions, except per share data) 2017 2016 2015 Net income $2,273 $1,878 $1,933 Less: Preferred stock dividends (94 ) (66 ) (64 ) Dividends and undistributed earnings allocated to unvested common share awards — (1 ) (6 ) Net income available to common shareholders $2,179 $1,811 $1,863 Average common shares outstanding - basic 481.3 498.6 514.8 Add dilutive securities: RSUs 3.0 2.9 2.6 Common stock warrants and restricted stock 1.8 0.6 1.7 Stock options 0.9 1.4 1.5 Average common shares outstanding - diluted 487.0 503.5 520.6 Net income per average common share - diluted $4.47 $3.60 $3.58 Net income per average common share - basic 4.53 3.63 3.62

Capital

Capital	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Regulatory Capital Requirements under Banking Regulations [Text Block]	NOTE 13 – CAPITAL During 2017 , pursuant to the Federal Reserve's non-objection to the Company's capital plan in conjunction with the 2017 CCAR , the Company increased its quarterly common stock dividend from $0.26 to $0.40 per share beginning in the third quarter of 2017 , maintained dividend payments on its preferred stock, and repurchased $660 million of its outstanding common stock at market value (approximately 11.1 million shares) under the 2017 capital plan. During the first half of 2017 , the Company repurchased $480 million of its outstanding common stock, which completed its authorized repurchase of common equity under the 2016 CCAR capital plan, which effectively expired on June 30, 2017. At December 31, 2017 , the Company had remaining capacity under its 2017 capital plan to repurchase an additional $660 million of its outstanding common stock through June 30, 2018. During the years ended December 31, 2017, 2016, and 2015 , the Company declared and paid common dividends of $634 million , or $1.32 per common share, $498 million , or $1.00 per common share, and $475 million , or $0.92 per common share, respectively. The Company also recognized dividends on perpetual preferred stock of $94 million , $66 million , and $64 million during the years ended December 31, 2017, 2016, and 2015 , respectively. During 2017 , both the Series A and Series B Perpetual Preferred Stock dividend was $4,056 per share, the Series E Perpetual Preferred Stock dividend was $5,875 per share, the Series F Perpetual Preferred Stock dividend was $5,625 per share, the Series G Perpetual Preferred Stock dividend was $3,128 per share, and the Series H Perpetual Preferred Stock dividend was $669 per share. The Company remains subject to certain restrictions on its ability to increase the dividend on common shares as a result of participating in the U.S. Treasury ’s CPP . If the Company increases its dividend above $0.54 per share per quarter prior to the tenth anniversary of its participation in the CPP (in the fourth quarter of 2018), then the anti-dilution provision within the warrants issued in connection with the Company’s participation in the CPP will require the exercise price and number of shares to be issued upon exercise to be proportionately adjusted. The amount of such adjustment is determined by a formula and depends in part on the extent to which the Company raises its dividend. The formulas are contained in the warrant agreements which were filed as exhibits to Registration Statements on Form 8-A filed on September 23, 2011. Substantially all of the Company’s retained earnings are undistributed earnings of the Bank, which are restricted by various regulations administered by federal and state bank regulatory authorities. At both December 31, 2017 and 2016 , retained earnings of the Bank available for payment of cash dividends to the Parent Company under these regulations totaled approximately $2.5 billion . Additionally, the Federal Reserve requires the Company to maintain cash reserves. At December 31, 2017 and 2016 , these reserve requirements totaled $1.2 billion and $1.3 billion , respectively, and were fulfilled with a combination of cash on hand and deposits at the Federal Reserve. Regulatory Capital The Company is subject to various regulatory capital requirements that involve quantitative measures of the Company’s assets. The following table presents regulatory capital metrics for SunTrust and the Bank at December 31: 2017 2016 (Dollars in millions) Amount Ratio Amount Ratio SunTrust Banks, Inc. CET1 $17,141 9.74 % $16,953 9.59 % Tier 1 capital 19,622 11.15 18,186 10.28 Total capital 23,028 13.09 21,685 12.26 Leverage 9.80 9.22 SunTrust Bank CET1 $19,474 11.29 % $18,535 10.71 % Tier 1 capital 19,496 11.31 18,573 10.73 Total capital 22,132 12.83 21,276 12.29 Leverage 9.97 9.63 In 2013, the Federal Reserve published final rules in the Federal Register implementing Basel III . These rules, which became effective for the Company and the Bank on January 1, 2015, include the following minimum capital requirements: CET1 ratio of 4.5% ; Tier 1 capital ratio of 6% ; Total capital ratio of 8% ; Leverage ratio of 4% ; and a capital conservation buffer of 2.5% . The capital conservation buffer became applicable on January 1, 2016 and is being phased-in through December 31, 2018. Preferred Stock Preferred stock at December 31 consisted of the following: (Dollars in millions) 2017 2016 2015 Series A (1,725 shares outstanding) $172 $172 $172 Series B (1,025 shares outstanding) 103 103 103 Series E (4,500 shares outstanding) 450 450 450 Series F (5,000 shares outstanding) 500 500 500 Series G (7,500 shares outstanding) 750 — — Series H (5,000 shares outstanding) 500 — — Total preferred stock $2,475 $1,225 $1,225 In September 2006, the Company authorized and issued depositary shares representing ownership interests in 5,000 shares of Perpetual Preferred Stock, Series A, no par value and $100,000 liquidation preference per share (the "Series A Preferred Stock"). The Series A Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company. Dividends on the Series A Preferred Stock, if declared, will accrue and be payable quarterly at a rate per annum equal to the greater of three-month LIBOR plus 0.53% , or 4.00% . Dividends on the shares are noncumulative. Shares of the Series A Preferred Stock have priority over the Company’s common stock with regard to the payment of dividends and, as such, the Company may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series A Preferred Stock have been declared for that period and sufficient funds have been set aside to make payment. During 2009, the Company repurchased 3,275 shares of the Series A Preferred Stock. In September 2011, the Series A Preferred Stock became redeemable at the Company’s option at a redemption price equal to $100,000 per share, plus any declared and unpaid dividends. Except in certain limited circumstances, the Series A Preferred Stock does not have any voting rights. In October 2006, the Company authorized 5,010 shares of Perpetual Preferred Stock, Series B, and in December 2011, the Company issued 1,025 shares of Perpetual Preferred Stock, Series B, no par value and $100,000 liquidation preference per share (the "Series B Preferred Stock"). The Series B Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company. Dividends on the shares are noncumulative and, if declared, will accrue and be payable quarterly at a rate per annum equal to the greater of three-month LIBOR plus 0.645% , or 4.00% . Shares of the Series B Preferred Stock have priority over the Company's common stock with regard to the payment of dividends and, as such, the Company may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series B Preferred Stock have been declared for that period and sufficient funds have been set aside to make payment. The Series B Preferred Stock was immediately redeemable upon issuance at the Company's option at a redemption price equal to $100,000 per share, plus any declared and unpaid dividends. Except in certain limited circumstances, the Series B Preferred Stock does not have any voting rights. In December 2012, the Company authorized and issued depositary shares representing ownership interests in 5,000 shares and 4,500 shares, respectively, of Perpetual Preferred Stock, Series E, no par value and $100,000 liquidation preference per share (the "Series E Preferred Stock"). The Series E Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company to redeem, repurchase, or retire the shares. Dividends on the shares are noncumulative and, if declared, will accrue and be payable quarterly at a rate per annum of 5.875% . Shares of the Series E Preferred Stock have priority over the Company's common stock with regard to the payment of dividends and rank equally with the Company's outstanding Perpetual Preferred Stock, Series A and Series B and, as such, the Company may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series E Preferred Stock have been declared for that period and sufficient funds have been set aside to make payment. The Series E Preferred Stock is redeemable, at the option of the Company, on any dividend payment date occurring on or after March 15, 2018 or at any time within 90 days following a regulatory capital event, at a redemption price equal to $100,000 per share, plus any declared and unpaid dividends, without regard to any undeclared dividends. Except in certain limited circumstances, the Series E Preferred Stock does not have any voting rights. In November 2014, the Company authorized and issued depositary shares representing ownership interest in 5,000 shares of Perpetual Preferred Stock, Series F, with no par value and $100,000 liquidation preference per share (the "Series F Preferred Stock"). The Series F Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company to redeem, repurchase, or retire the shares. Dividends for the shares are noncumulative and, if declared, will be payable semi-annually beginning on June 15, 2015 through December 15, 2019 at a rate per annum of 5.625% , and payable quarterly beginning on March 15, 2020 at a rate per annum equal to the three-month LIBOR plus 3.86% . By its terms, the Company may redeem the Series F Preferred Stock on any dividend payment date occurring on or after December 15, 2019 or at any time within 90 days following a regulatory capital event, at a redemption price of $100,000 per share plus any declared and unpaid dividends. Except in certain limited circumstances, the Series F Preferred Stock does not have any voting rights. In May 2017, the Company authorized and issued depositary shares representing ownership interest in 7,500 shares of Perpetual Preferred Stock, Series G, with no par value and $100,000 liquidation preference per share (the "Series G Preferred Stock"). The Series G Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company to redeem, repurchase, or retire the shares. Dividends for the shares are noncumulative and, if declared, will be payable semi-annually beginning on December 15, 2017 through June 15, 2022 at a rate per annum of 5.05% , and payable quarterly beginning on September 15, 2022 at a rate per annum equal to the three-month LIBOR plus 3.102% . By its terms, the Company may redeem the Series G Preferred Stock on any dividend payment date occurring on or after June 15, 2022 or at any time within 90 days following a regulatory capital event, at a redemption price of $100,000 per share plus any declared and unpaid dividends. Except in certain limited circumstances, the Series G Preferred Stock does not have any voting rights. In November 2017, the Company authorized and issued depositary shares representing ownership interest in 5,000 shares of Perpetual Preferred Stock, Series H, with no par value and $100,000 liquidation preference per share (the "Series H Preferred Stock"). The Series H Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company to redeem, repurchase, or retire the shares. Dividends for the shares are noncumulative and, if declared, will be payable semi-annually beginning on June 15, 2018 through December 15, 2027 at a rate per annum of 5.125% , and payable quarterly beginning on March 15, 2028 at a rate per annum equal to the three-month LIBOR plus 2.786% . By its terms, the Company may redeem the Series H Preferred Stock on any dividend payment date occurring on or after December 15, 2027 or at any time within 90 days following a regulatory capital event, at a redemption price of $100,000 per share plus any declared and unpaid dividends. Except in certain limited circumstances, the Series H Preferred Stock does not have any voting rights. In 2008, the Company issued to the U.S. Treasury as part of the CPP , 35,000 and 13,500 shares of Series C and D Fixed Rate Cumulative Perpetual Preferred Stock, respectively, and Series A and B warrants to purchase a total of 17.9 million shares of the Company's common stock. The Series A warrants entitle the holder to purchase 6 million shares of the Company's common stock at an exercise price of $33.70 per share, while the Series B warrants entitle the holder to purchase 11.9 million shares of the Company's common stock at an exercise price of $44.15 per share. In March 2011, the Company repurchased its Series C and D Preferred Stock from the U.S. Treasury , and in September 2011, the U.S. Treasury held a public auction to sell the Series A and B common stock purchase warrants. In conjunction with the U.S. Treasury 's auction, the Company acquired 4 million of the common stock purchase warrants, Series A, for $11 million , which were then retired. In January and February of 2016, the Company acquired an additional 1.1 million of Series A common stock warrants and 5.4 million of Series B common stock warrants as part of its 2015 CCAR capital plan for a total of $24 million . At December 31, 2017 , 7.1 million warrants to purchase the Company's common stock remained outstanding and the Company had authority from its Board to repurchase all of these outstanding stock purchase warrants. The Series A and B warrants have expiration dates of December 2018 and November 2018, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	NOTE 14 - INCOME TAXES The components of the Provision for income taxes included in the Consolidated Statements of Income for the years ended December 31 are presented in the following table: (Dollars in millions) 2017 2016 2015 Current income tax provision: Federal $129 $667 $707 State 59 27 36 Total 188 694 743 Deferred income tax provision/(benefit): Federal 275 59 27 State 69 52 (6 ) Total 344 111 21 Total provision for income taxes $532 $805 $764 The 2017 Tax Act , enacted on December 22, 2017, reduced the U.S. federal corporate income tax rate from 35% to 21% effective January 1, 2018. At December 31, 2017, the Company recorded a net income tax benefit for the estimated effects of the 2017 Tax Act as a component of the provision for income taxes, which was due primarily to a $333 million tax benefit for the remeasurement of the Company's estimated DTA s and DTL s to reflect the new federal income tax rate of 21% . However, as additional information becomes available and additional analysis is completed, the estimate of the DTA s and DTL s may change, which could impact the remeasurement of these deferred tax balances. Any adjustment to the remeasurement amount would be recorded as an adjustment to the provision for income taxes in 2018 in the period the amounts are determined. The provision for income taxes does not reflect the tax effects of unrealized gains and losses and other income and expenses recorded in AOCI, with the exception of the remeasurement of the related DTA s and DTL s due to the enactment of the 2017 Tax Act . For additional information regarding AOCI, see Note 21 , “Accumulated Other Comprehensive Loss.” A reconciliation of the income tax provision, using the statutory federal income tax rate of 35% , to the Company’s actual provision for income taxes and the effective tax rate during the years ended December 31 are presented in the following table: 2017 2016 2015 (Dollars in millions) Amount % of Pre-Tax Income Amount % of Pre-Tax Income Amount % of Income tax provision at federal statutory rate $982 35.0 % $939 35.0 % $944 35.0 % Increase/(decrease) resulting from: State income taxes, net 66 2.4 53 2.0 25 0.9 Tax-exempt interest (90 ) (3.2 ) (86 ) (3.2 ) (88 ) (3.3 ) Changes in UTBs (including interest), net 26 0.9 6 0.2 (31 ) (1.1 ) Income tax credits, net of amortization 1 (117 ) (4.2 ) (86 ) (3.2 ) (69 ) (2.6 ) Estimated impact of the remeasurement of DTAs and DTLs and other tax reform-related items 2 (303 ) (10.8 ) — — — — Other 3 (32 ) (1.1 ) (21 ) (0.8 ) (17 ) (0.6 ) Total provision for income taxes and effective tax rate $532 19.0 % $805 30.0 % $764 28.3 % 1 Excludes income tax benefits of $43 million , $2 million , and $6 million for the years ended December 31, 2017, 2016, and 2015 , respectively, related to tax credits, which were recognized as a reduction to the related investment asset. 2 Includes reasonable estimates as of December 31, 2017, which could be adjusted as additional analysis is completed in 2018. 3 Includes excess tax benefits of $25 million and $15 million for the years ended December 31, 2017 and 2016 , respectively, related to the Company's adoption of ASU 2016-09. Deferred income tax assets and liabilities result from differences between the timing of the recognition of assets and liabilities for financial reporting purposes and for income tax purposes. These assets and liabilities are measured using the enacted federal and state tax rates expected to apply in the periods in which the DTA s or DTL s are expected to be realized. The net deferred income tax liability is recorded in Other liabilities in the Consolidated Balance Sheets. At December 31, 2017 , the Company remeasured its DTA s and DTL s using the newly enacted federal income tax rate of 21% , which is the rate that is expected to apply in the periods in which these assets and liabilities are expected to be realized in the future. The significant DTA s and DTL s at December 31 , net of the federal impact for state taxes, are presented in the following table: (Dollars in millions) 2017 1 2016 2 DTAs: ALLL $412 $639 Net unrealized losses in AOCI 302 472 State NOLs and other carryforwards 227 170 Accruals and reserves 180 343 Other 17 19 Total gross DTAs 1,138 1,643 Valuation allowance (143 ) (80 ) Total DTAs 995 1,563 DTLs: Leasing 459 659 Servicing rights 290 370 Employee compensation and benefits 210 179 Deferred income 193 22 Goodwill and other intangible assets 155 233 Fixed assets 111 113 Loans 104 176 Other 41 43 Total DTLs 1,563 1,795 Net DTL ($568 ) ($232 ) 1 The Company's DTA s and DTL s for December 31, 2017 were calculated using the enacted federal income rate of 21% . 2 The Company's DTA s and DTL s for December 31, 2016 were calculated using the enacted federal income rate of 35% . The DTA s include state NOL s and other state carryforwards that will expire, if not utilized, in varying amounts from 2018 to 2037 . At December 31, 2017 and 2016 , the Company had a valuation allowance recorded against its state carryforwards and certain state DTA s of $143 million and $80 million , respectively. The increase in the valuation allowance was due primarily to an increase in the valuation allowance recorded for STM 's state NOL s as well as the reduction in the federal benefit of the state valuation allowance due to the reduction in the federal income tax rate. A valuation allowance is not required for the federal and the remaining state DTA s because the Company believes it is more-likely-than-not that these assets will be realized. The following table provides a rollforward of the Company's gross federal and state UTB s, excluding interest and penalties, during the years ended December 31 : (Dollars in millions) 2017 2016 Balance at January 1 $111 $100 Increases in UTBs related to prior years 22 18 Decreases in UTBs related to prior years (5 ) (4 ) Increases in UTBs related to the current year 13 13 Decreases in UTBs related to settlements — (16 ) Balance at December 31 $141 $111 The amount of UTB s that would favorably affect the Company's effective tax rate, if recognized, was $112 million at December 31, 2017 . Interest and penalties related to UTB s are recorded in the Provision for income taxes in the Consolidated Statements of Income. The Company had a gross liability of $17 million and $8 million for interest and penalties related to its UTB s at December 31, 2017 and 2016 , respectively. During the years ended December 31, 2017 and 2016 , the Company recognized a gross expense of $10 million and a gross benefit of less than $1 million , respectively, related to interest and penalties on the UTB s. The Company files U.S. federal, state, and local income tax returns. The Company's federal income tax returns are no longer subject to examination by the IRS for taxable years prior to 2012. With limited exceptions, the Company is no longer subject to examination by state and local taxing authorities for taxable years prior to 2012. It is reasonably possible that the liability for UTB s could decrease by as much as $30 million during the next 12 months due to completion of tax authority examinations and the expiration of statutes of limitations. It is uncertain how much, if any, of this potential decrease will impact the Company’s effective tax rate.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Employee Benefit Plans	NOTE 15 - EMPLOYEE BENEFIT PLANS The Company sponsors various compensation and benefit programs to attract and retain talent. Aligned with a pay for performance culture, the Company's plans and programs include short-term incentives, AIP , and various LTI plans. All incentive awards are subject to clawback provisions. Compensation expense for AIP and LTI plans with cash payouts was $319 million , $291 million , and $245 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Compensation expense for short-term incentive plans with cash payouts was $476 million , $469 million , and $448 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Stock-Based Compensation The Company provides stock-based awards through the 2009 Stock Plan and various other deferred compensation plans under which the Compensation Committee of the Board of Directors has the authority to grant stock options, stock appreciation rights, restricted stock, phantom stock units, and RSU s to key employees of the Company. Award vesting may be conditional based upon individual, business unit, Company, and/or performance relative to peer group metrics. Effective January 1, 2014, following approval by the Compensation Committee of the Board, shareholders approved an amendment to the 2009 Stock Plan to remove the sub-limit on shares available for grant that may be issued as restricted stock or RSU s. Accordingly, all 17 million remaining authorized shares previously under the Stock Plan became available for grant as stock options, stock appreciation rights, restricted stock, or RSU s. Prior to the amendment, only a portion of such shares were available to be granted as either restricted stock or RSU s. At December 31, 2017 , approximately 16 million shares were available for grant. All stock option grants are exercisable for 10 years after the grant date. Shares or units of restricted stock may be granted to employees and directors. Generally, grants to employees either cliff vest after three years or vest pro-rata annually over three years. Restricted stock and RSU grants may be subject to one or more criteria, including employment, performance, or other conditions as established by the Compensation Committee at the time of grant. Any shares of restricted stock that are forfeited will again become available for issuance under the Stock Plan. An employee or director has the right to vote the shares of restricted stock after grant until they are forfeited. Compensation cost for restricted stock and RSU s is generally equal to the fair market value of the shares on the grant date of the award and is amortized over the vesting period. Dividends are paid on awarded, unvested restricted stock. The Company accrues and reinvests dividends in equivalent shares of SunTrust common stock for unvested RSU awards, which are paid out when the underlying RSU award vests. RSU awards are generally classified as equity. Consistent with the Company's 2014 decision to discontinue the issuance of stock options, no stock options were granted during the years ended December 31, 2017, 2016, and 2015 . The following table presents a summary of stock options, restricted stock, and RSU activity for the year ended December 31, 2017 : Stock Options Restricted Stock RSUs (Dollars in millions, except per share data) Shares Price Weighted Shares Deferred Weighted Shares Weighted Balance, January 1, 2017 3,253,793 $9.06 - 85.34 $42.54 11,312 $— $42.44 4,175,809 $36.27 Granted — — — 8,744 1 57.19 1,901,144 59.95 Exercised/distributed (830,383 ) 9.06 - 64.58 25.38 (11,312 ) — 42.44 (1,703,795 ) 36.62 Cancelled/expired/forfeited (764,105 ) 56.34 - 85.34 81.77 — — — (219,439 ) 44.32 Balance, December 31, 2017 1,659,305 $9.06 - 64.58 $35.33 8,744 $1 $57.19 4,153,719 $44.68 Exercisable, December 31, 2017 1,659,305 $35.33 The following table presents stock option information at December 31, 2017 : Options Outstanding Options Exercisable (Dollars in millions, except per share data) Number at December 31, 2017 Weighted Weighted Total Number at December 31, 2017 Weighted Weighted Total Range of Exercise Prices: $9.06 to 49.46 1,170,605 $23.12 3.42 $48,545 1,170,605 $23.12 3.42 $48,545 $64.58 488,700 64.58 0.12 5 488,700 64.58 0.12 5 $9.06 to 64.58 1,659,305 $35.33 2.45 $48,550 1,659,305 $35.33 2.45 $48,550 The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value (the difference between the Company’s closing stock price on the last trading day of 2017 and the exercise price, multiplied by the number of in-the-money stock options) that would have been received by the option holders had all option holders exercised their options on December 31, 2017 . Additional option and stock-based compensation information at December 31 is presented in the following table: (Dollars in millions) 2017 2016 2015 Intrinsic value of options exercised 1 $28 $43 $15 Fair value of vested restricted shares 1 — 41 35 Fair value of vested RSUs 1 62 74 23 1 Measured as of the grant date. At December 31, 2017 and 2016 , there was $75 million and $65 million , respectively, of unrecognized stock-based compensation expense related to stock options, restricted stock, and RSU s. The unrecognized stock compensation expense for December 31, 2017 is expected to be recognized over a weighted average period of 2.0 years. Additionally, the Company allows for the granting of phantom stock units, whereby certain employees are granted the contractual right to receive an amount in cash equal to the fair market value of a share of common stock on the vesting date. These shares vest pro-rata annually over three years on the anniversary of the grant date and are subject to variable accounting. The employees are entitled to dividend-equivalent rights on the granted shares. The Company granted less than 1 million , 2 million , and 1 million phantom stock units during the years ended December 31, 2017, 2016, and 2015 , respectively. The unrecognized compensation expense related to these phantom stock units as of December 31, 2017 was $56 million based on the Company's stock price as of that date. Stock-based compensation expense recognized in Employee compensation in the Consolidated Statements of Income consisted of the following: Years Ended December 31 (Dollars in millions) 2017 2016 2015 RSUs $83 $56 $46 Phantom stock units 1 77 67 32 Restricted stock — 2 16 Stock options — — 1 Total stock-based compensation expense $160 $125 $95 Stock-based compensation tax benefit 2 $61 $48 $36 1 Phantom stock units are settled in cash. The Company paid $80 million , $28 million , and $16 million during the years ended December 31, 2017, 2016, and 2015 , respectively, related to these share-based liabilities. 2 Does not include excess tax benefits or deficiencies recognized in the Provision for income taxes in the Consolidated Statements of Income. Retirement Plans Noncontributory Pension Plans The Company maintains various frozen, funded, noncontributory qualified retirement plans ("Retirement Plans") covering employees meeting certain service requirements. The Retirement Plans provide benefits based on salary and years of service. The SunTrust Retirement Plan includes a cash balance formula where the PPAs continue to be credited with interest each year. The interest crediting rate applied to each PPA was 3.11% for 2017 . The Company monitors the funded status of the Retirement Plans closely and, due to the current funded status, the Company did not make a contribution to them for the 2017 plan year. The Company also maintains various frozen, unfunded, noncontributory nonqualified supplemental defined benefit pension plans that cover key executives of the Company (the " SERP ", the " ERISA Excess Plan", and the "Restoration Plan"). These plans provide defined benefits based on years of service and salary. Other Postretirement Benefits The Company provides certain health care and life insurance benefits (“Other Postretirement Benefits”) to retired employees. At the option of the Company, retirees may continue certain health and life insurance benefits if they meet specific age and service requirements at the time of retirement. The health care plans are contributory with participant contributions adjusted annually, and the life insurance plans are noncontributory. Certain retiree health benefits are funded in a Retiree Health Trust. Additionally, certain retiree life insurance benefits are funded in a VEBA . Effective April 1, 2014, the Company amended the plan, which now requires retirees age 65 and older to enroll in individual Medicare supplemental plans. In addition, the Company will fund a tax-advantaged HRA to assist some retirees with medical expenses. Changes in Benefit Obligations and Plan Assets The following table presents the change in benefit obligations, change in fair value of plan assets, funded status, accumulated benefit obligation, and the weighted average discount rate related to the Company's pension and other postretirement benefits plans for the years ended December 31 : Pension Benefits 1 Other Postretirement Benefits (Dollars in millions) 2017 2016 2017 2016 Benefit obligation, beginning of year $2,747 $2,716 $58 $65 Service cost 5 5 — — Interest cost 95 97 1 2 Plan participants’ contributions — — 4 4 Actuarial loss/(gain) 225 76 (1 ) (4 ) Benefits paid (156 ) (142 ) (8 ) (9 ) Administrative expenses paid from pension trust (6 ) (5 ) — — Plan amendments — — (5 ) — Special termination benefits — — 9 — Benefit obligation, end of year 2 $2,910 $2,747 $58 $58 Change in plan assets: Fair value of plan assets, beginning of year $3,016 $2,879 $157 $156 Actual return on plan assets 425 279 11 5 Employer contributions 3 9 5 — — Plan participants’ contributions — — 4 5 Benefits paid (156 ) (142 ) (8 ) (9 ) Administrative expenses paid from pension trust (6 ) (5 ) — — Fair value of plan assets, end of year 4 $3,288 $3,016 $164 $157 Funded status at end of year 5, 6 $378 $269 $106 $99 Funded status at end of year (%) 113 % 110 % Accumulated benefit obligation $2,910 $2,747 Discount rate 3.62 % 4.18 % 3.29 % 3.70 % 1 Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets. 2 Includes $78 million and $80 million of benefit obligations for the unfunded nonqualified supplemental pension plans at December 31, 2017 and 2016 , respectively. 3 The Company contributed less than $1 million to the other postretirement benefits plans during both 2017 and 2016 . 4 Includes $1 million and $2 million of the Company's common stock acquired by the asset manager and held as part of the equity portfolio for pension benefits at December 31, 2017 and 2016 , respectively. During both 2017 and 2016 , there was no SunTrust common stock held in the other postretirement benefit plans. 5 Pension benefits recorded in the Consolidated Balance Sheets included other assets of $456 million and $349 million , and other liabilities of $78 million and $80 million , at December 31, 2017 and 2016 , respectively. 6 Other postretirement benefits recorded in the Consolidated Balance Sheets included other assets of $106 million and $99 million at December 31, 2017 and 2016 , respectively. Net Periodic Benefit Components of net periodic benefit related to the Company's pension and other postretirement benefits plans for the years ended December 31 are presented in the following table and are recognized in Employee benefits in the Consolidated Statements of Income: Pension Benefits 1 Other Postretirement Benefits (Dollars in millions) 2017 2016 2015 2017 2016 2015 Service cost $5 $5 $5 $— $— $— Interest cost 95 97 116 1 2 2 Expected return on plan assets (195 ) (186 ) (206 ) (5 ) (5 ) (5 ) Amortization of prior service credit — — — (6 ) (6 ) (6 ) Amortization of actuarial loss 25 25 21 — — — Other — — — 9 — — Net periodic benefit ($70 ) ($59 ) ($64 ) ($1 ) ($9 ) ($9 ) Weighted average assumptions used to determine net periodic benefit: Discount rate 4.18 % 4.44 % 4.09 % 3.70 % 3.95 % 3.60 % Expected return on plan assets 6.66 6.68 6.91 3.12 3.13 3.50 1 Administrative fees are recognized in service cost for each of the periods presented. In the second quarter of 2017, the Company amended its NCF Retirement Plan in accordance with its decision to terminate the pension plan effective as of July 31, 2017. The NCF pension plan termination is expected to be completed by the end of 2018 and the Company is in process of evaluating the impact of the termination and expected future settlement accounting on its Consolidated Financial Statements and related disclosures. Amounts Recognized in AOCI Components of the benefit obligations AOCI balance at December 31 were as follows: Pension Benefits Other Postretirement Benefits (Dollars in millions) 2017 2016 2017 2016 Prior service credit $— $— ($58 ) ($59 ) Net actuarial loss/(gain) 1,001 1,031 (22 ) (15 ) Total AOCI, pre-tax $1,001 $1,031 ($80 ) ($74 ) Other changes in plan assets and benefit obligations recognized in AOCI during 2017 were as follows: (Dollars in millions) Pension Benefits Other Postretirement Benefits Current year prior service credit $— ($5 ) Current year actuarial gain (5 ) (7 ) Amortization of prior service credit — 6 Amortization of actuarial loss (25 ) — Total recognized in AOCI, pre-tax ($30 ) ($6 ) Total recognized in net periodic benefit and AOCI, pre-tax ($100 ) ($7 ) For pension plans, the estimated actuarial loss that will be amortized from AOCI into net periodic benefit in 2018 is $23 million . For other postretirement benefit plans, the estimated prior service credit and actuarial gain to be amortized from AOCI into net periodic benefit in 2018 is $7 million . The amortization for net gains and losses reflects a corridor based on 10% of the greater of the projected benefit obligation or the market-related value of assets. The amount of net gains and losses that exceeds the corridor is amortized over a fixed period based on the average remaining lifetime. Plan Assumptions Each year, the SBFC , which includes several members of senior management, reviews and approves the assumptions used in the year-end measurement calculations for each plan. The discount rate for each plan, used to determine the present value of future benefit obligations, is determined by matching the expected cash flows of each plan to a yield curve based on long-term, high quality fixed income debt instruments available as of the measurement date. A series of benefit payments projected to be paid by the plan is developed based on the most recent census data, plan provisions, and assumptions. The benefit payments at each future maturity date are discounted by the year-appropriate spot interest rates. The model then solves for the discount rate that produces the same present value of the projected benefit payments as generated by discounting each year’s payments by the spot interest rate. The Company utilizes a full yield curve approach to estimate the service and interest cost components of net periodic benefit expense for pension and other postretirement benefit plans by applying specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows. Actuarial gains and losses are created when actual experience deviates from assumptions. The actuarial gains during 2017 and 2016 for the pension plans resulted primarily from asset experience, partially offset by losses due to the decrease in discount rates. The SBFC establishes investment policies and strategies and formally monitors the performance of the investments throughout the year. The Company’s investment strategy with respect to pension assets is to invest the assets in accordance with ERISA and related fiduciary standards. The long-term primary investment objectives for the pension plans are to provide a commensurate amount of long-term growth of principal and income in order to satisfy the pension plan obligations without undue exposure to risk in any single asset class or investment category. The objectives are accomplished through investments in equities, fixed income, and cash equivalents using a mix that is conducive to participation in a rising market while allowing for protection in a declining market. The portfolio is viewed as long-term in its entirety, avoiding decisions regarding short-term concerns and any single investment. Asset allocation, as a percent of the total market value of the total portfolio, is set with the target percentages and ranges presented in the investment policy statement. Rebalancing occurs on a periodic basis to maintain the target allocation, but normal market activity may result in deviations. The basis for determining the overall expected long-term rate of return on plan assets considers past experience, current market conditions, and expectations on future trends. A building block approach is used that considers long-term inflation, real returns, equity risk premiums, target asset allocations, market corrections, and expenses. Capital market simulations, survey data, economic forecasts, and actuarial judgment are all used in this process. The expected long-term rate of return for pension obligations is 5.90% for 2018 . The investment strategy for the other postretirement benefit plans is maintained separately from the strategy for the pension plans. The Company’s investment strategy is to create a series of investment returns sufficient to provide a commensurate amount of long-term principal and income growth in order to satisfy the other postretirement benefit plan's obligations. Assets are diversified among equity funds and fixed income investments according to the mix approved by the SBFC . Due to other postretirement benefits having a shorter time horizon, a lower equity profile is appropriate. The expected long-term rate of return for other postretirement benefits is 3.10% for 2018 . Plan Assets Measured at Fair Value The following tables present combined pension and other postretirement benefit plan assets measured at fair value. See Note 18 , "Fair Value Election and Measurement" for level definitions within the fair value hierarchy. Fair Value Measurements at December 31, 2017 1 (Dollars in millions) Total Level 1 Level 2 Level 3 Money market funds 2 $138 $138 $— $— Equity securities 936 936 — — Mutual funds 3 : Equity index fund 56 56 — — Tax exempt municipal bond funds 85 85 — — Taxable fixed income index funds 12 12 — — Futures contracts (5 ) (5 ) — — Fixed income securities 2,201 512 1,689 — Other assets 9 9 — — Total plan assets $3,432 $1,743 $1,689 $— 1 Fair value measurements do not include pension benefits accrued income amounting to less than 0.7% of total plan assets. 2 Includes $11 million for other postretirement benefit plans. 3 Relates exclusively to other postretirement benefit plans. Fair Value Measurements at December 31, 2016 1 (Dollars in millions) Total Level 1 Level 2 Level 3 Money market funds 2 $112 $112 $— $— Equity securities 1,415 1,415 — — Mutual funds 3 : Equity index fund 47 47 — — Tax exempt municipal bond funds 82 82 — — Taxable fixed income index funds 13 13 — — Futures contracts (5 ) — (5 ) — Fixed income securities 1,486 — 1,486 — Other assets 6 6 — — Total plan assets $3,156 $1,675 $1,481 $— 1 Fair value measurements do not include pension benefits accrued income amounting to less than 0.6% of total plan assets. 2 Includes $16 million for other postretirement benefit plans. 3 Relates exclusively to other postretirement benefit plans. Target allocations for pension and other postretirement benefits at December 31, by asset category, are presented below: Pension Benefits Other Postretirement Benefits 2017 Target Allocation % of plan assets 2017 Target Allocation % of plan assets 2017 2016 2017 2016 Cash equivalents 0-10 % 4 % 3 % 5-15 % 7 % 10 % Equity securities 0-40 29 47 20-40 34 30 Debt securities 40-100 67 50 50-70 59 60 Total 100 % 100 % 100 % 100 % The Company sets pension asset values equal to their market value, reflecting gains and losses immediately rather than deferring over a period of years, which provides a more realistic economic measure of the plan’s funded status and cost. Assumed healthcare cost trend rates have a significant effect on the amounts reported for the other postretirement benefit plans. At December 31, 2017 , the Company assumed that pre-65 retiree healthcare costs will increase at an initial rate of 8.25% per year. The Company expects this annual cost increase to decrease over an 8 -year period to 4.50% per year. The effect of a 1% increase/decrease in the healthcare cost trend rate for other postretirement benefit obligations, service cost, and interest cost are less than $1 million , respectively. Assumed discount rates and expected returns on plan assets affect the amounts of net periodic benefit. A 25 basis point increase/decrease in the expected long-term return on plan assets would increase/decrease the net periodic benefit by $8 million for pension and other postretirement benefits plans. A 25 basis point increase/decrease in the discount rate would change the net periodic benefit by $1 million for pension and other postretirement benefits plans. Expected Cash Flows Expected cash flows for the pension and other postretirement benefit plans are presented in the following table: (Dollars in millions) Pension Benefits 1 Other Postretirement Benefits (excluding Medicare Subsidy) 2 Employer Contributions: 2018 (expected) to plan trusts $— $— 2018 (expected) to plan participants 3 9 — Expected Benefit Payments: 2018 210 7 2019 172 6 2020 172 6 2021 170 6 2022 167 5 2023 - 2027 824 18 1 Based on the funding status and ERISA limitations, the Company anticipates contributions to the Retirement Plan will not be required during 2018 . 2 Expected payments under other postretirement benefit plans are shown net of participant contributions. 3 The expected benefit payments for the SERP will be paid directly from the Company's corporate assets. Defined Contribution Plans SunTrust's employee benefit program includes a qualified defined contribution plan. For years ended December 31, 2017, 2016, and 2015 , the 401(k) plan provided a dollar-for-dollar match on the first 6% of eligible pay that a participant, including executive participants, elected to defer. SunTrust also maintains the SunTrust Banks, Inc. Deferred Compensation Plan in which key executives of the Company are eligible. Matching contributions for the deferred compensation plan are the same percentage as provided in the 401(k) plan, subject to limitations imposed by the plans' provisions and applicable laws and regulations. Matching contributions for both the Company's 401(k) plan and the deferred compensation plan fully vest upon two years of completed service. Furthermore, both plans permit an additional discretionary Company contribution equal to a fixed percentage of eligible pay. The Company's 401(k) expense, including any discretionary contributions, was $130 million , $105 million , and $121 million for the years ended December 31, 2017, 2016, and 2015 , respectively.

Guarantees

Guarantees	12 Months Ended
	Dec. 31, 2017
Guarantees [Abstract]
Guarantees	NOTE 16 – GUARANTEES The Company has undertaken certain guarantee obligations in the ordinary course of business. The issuance of a guarantee imposes an obligation for the Company to stand ready to perform and make future payments should certain triggering events occur. Payments may be in the form of cash, financial instruments, other assets, shares of stock, or through provision of the Company’s services. The following is a discussion of the guarantees that the Company has issued at December 31, 2017 . The Company has also entered into certain contracts that are similar to guarantees, but that are accounted for as derivative instruments as discussed in Note 17 , “Derivative Financial Instruments.” Letters of Credit Letters of credit are conditional commitments issued by the Company, generally to guarantee the performance of a client to a third party in borrowing arrangements, such as CP , bond financing, or similar transactions. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to clients but may be reduced by selling participations to third parties. The Company issues letters of credit that are classified as financial standby, performance standby, or commercial letters of credit; however, commercial letters of credit are considered guarantees of funding and are not subject to the disclosure requirements of guarantee obligations. At December 31, 2017 and 2016 , the maximum potential exposure to loss related to the Company's issued letters of credit was $2.6 billion and $2.9 billion , respectively. The Company’s outstanding letters of credit generally have a term of more than one year. Some standby letters of credit are designed to be drawn upon in the normal course of business and others are drawn upon only in circumstances of dispute or default in the underlying transaction to which the Company is not a party. In all cases, the Company is entitled to reimbursement from the client. If a letter of credit is drawn upon and reimbursement is not provided by the client, the Company may take possession of the collateral securing the letter of credit, where applicable. The Company monitors its credit exposure under standby letters of credit in the same manner as it monitors other extensions of credit in accordance with its credit policies. Consistent with the methodologies used for all commercial borrowers, an internal assessment of the PD and loss severity in the event of default is performed. The management of credit risk for letters of credit leverages the risk rating process to focus greater visibility on higher risk and higher dollar letters of credit. The allowance associated with letters of credit is a component of the unfunded commitments reserve recorded in Other liabilities on the Consolidated Balance Sheets and is included in the allowance for credit losses as disclosed in Note 7 , “Allowance for Credit Losses.” Additionally, unearned fees relating to letters of credit are recorded in Other liabilities on the Consolidated Balance Sheets. The net carrying amount of unearned fees was immaterial at both December 31, 2017 and 2016 . Loan Sales and Servicing STM , a consolidated subsidiary of the Company, originates and purchases residential mortgage loans, a portion of which are sold to outside investors in the normal course of business through a combination of whole loan sales to GSE s, Ginnie Mae , and non-agency investors. The Company also originates and sells certain commercial mortgage loans to Fannie Mae and Freddie Mac , originates FHA insured loans, and issues and sells Ginnie Mae commercial MBS secured by FHA insured loans. When loans are sold, representations and warranties regarding certain attributes of the loans are made to third party purchasers. Subsequent to the sale, if a material underwriting deficiency or documentation defect is discovered, the Company may be obligated to repurchase the loan or to reimburse an investor for losses incurred (make whole requests), if such deficiency or defect cannot be cured by the Company within the specified period following discovery. These representations and warranties may extend through the life of the loan. In addition to representations and warranties related to loan sales, the Company makes representations and warranties that it will service the loans in accordance with investor servicing guidelines and standards, which may include (i) collection and remittance of principal and interest, (ii) administration of escrow for taxes and insurance, (iii) advancing principal, interest, taxes, insurance, and collection expenses on delinquent accounts, and (iv) loss mitigation strategies, including loan modifications and foreclosures. The following table summarizes the changes in the Company’s reserve for residential mortgage loan repurchases for the years ended December 31 : (Dollars in millions) 2017 2016 2015 Balance, beginning of period $40 $57 $85 Repurchase provision/(benefit) — (17 ) (12 ) Charge-offs, net of recoveries (1 ) — (16 ) Balance, end of period $39 $40 $57 A significant degree of judgment is used to estimate the mortgage repurchase liability as the estimation process is inherently uncertain and subject to imprecision. The Company believes that its reserve appropriately estimates incurred losses based on its current analysis and assumptions. While the mortgage repurchase reserve includes the estimated cost of settling claims related to required repurchases, the Company's estimate of losses depends on its assumptions regarding GSE and other counterparty behavior, loan performance, home prices, and other factors. The liability is recorded in Other liabilities on the Consolidated Balance Sheets, and the related repurchase provision/(benefit) is recognized in Mortgage production related income in the Consolidated Statements of Income. See Note 19 , "Contingencies," for additional information on current legal matters related to loan sales. The following table summarizes the carrying value of the Company's outstanding repurchased residential mortgage loans at December 31 : (Dollars in millions) 2017 2016 Outstanding repurchased residential mortgage loans: Performing LHFI $203 $230 Nonperforming LHFI 16 12 Total carrying value of outstanding repurchased residential mortgages $219 $242 Residential mortgage loans sold to Ginnie Mae are insured by the FHA or are guaranteed by the VA . As servicer, the Company may elect to repurchase delinquent loans in accordance with Ginnie Mae guidelines; however, the loans continue to be insured. The Company may also indemnify the FHA and VA for losses related to loans not originated in accordance with their guidelines. Commercial Mortgage Loan Loss Share Guarantee In connection with the December 2016 acquisition of Pillar , the Company assumed a loss share obligation associated with the terms of a master loss sharing agreement with Fannie Mae for multi-family commercial mortgage loans that were sold by Pillar to Fannie Mae under Fannie Mae ’s delegated underwriting and servicing program. Upon the acquisition of Pillar , the Company entered into a lender contract amendment with Fannie Mae for multi-family commercial mortgage loans that Pillar sold to Fannie Mae prior to acquisition and that the Company sold to Fannie Mae subsequent to acquisition, whereby the Company bears a risk of loss of up to one-third of the incurred losses resulting from borrower defaults. The breach of any representation or warranty related to a loan sold to Fannie Mae could increase the Company's level of risk-sharing associated with the loan. The outstanding UPB of loans sold subject to the loss share guarantee was $3.4 billion and $2.9 billion at December 31, 2017 and 2016 , respectively. The maximum potential exposure to loss was $962 million and $787 million at December 31, 2017 and 2016 , respectively. Using probability of default and severity of loss estimates, the Company's loss share liability was $11 million and $6 million at December 31, 2017 and 2016 , respectively, and is recorded in Other liabilities on the Consolidated Balance Sheets. Visa The Company executes credit and debit transactions through Visa and MasterCard . The Company is a defendant, along with Visa and MasterCard (the “Card Associations”), as well as several other banks, in one of several antitrust lawsuits challenging the practices of the Card Associations (the “Litigation”). The Company entered into judgment and loss sharing agreements with Visa and certain other banks in order to apportion financial responsibilities arising from any potential adverse judgment or negotiated settlements related to the Litigation. Additionally, in connection with Visa 's restructuring in 2007, shares of Visa common stock were issued to its financial institution members and the Company received its proportionate number of shares of Visa Inc. common stock, which were subsequently converted to Class B shares of Visa Inc. upon completion of Visa ’s IPO in 2008. A provision of the original Visa By-Laws, which was restated in Visa 's certificate of incorporation, contains a general indemnification provision between a Visa member and Visa that explicitly provides that each member's indemnification obligation is limited to losses arising from its own conduct and the specifically defined Litigation. While the district court approved a class action settlement of the Litigation in 2012, the U.S. Court of Appeals for the Second Circuit reversed the district court's approval of the settlement on June 30, 2016. The U.S. Supreme Court denied plaintiffs' petition for certiorari on March 27, 2017, and the case returned to the district court for further action. Agreements associated with Visa 's IPO have provisions that Visa will fund a litigation escrow account, established for the purpose of funding judgments in, or settlements of, the Litigation. If the escrow account is insufficient to cover the Litigation losses, then Visa will issue additional Class A shares (“loss shares”). The proceeds from the sale of the loss shares would then be deposited in the escrow account. The issuance of the loss shares will cause a dilution of Visa 's Class B shares as a result of an adjustment to lower the conversion factor of the Class B shares to Class A shares . Visa U.S.A.'s members are responsible for any portion of the settlement or loss on the Litigation after the escrow account is depleted and the value of the Class B shares is fully diluted. In May 2009, the Company sold its 3.2 million Class B shares to the Visa Counterparty and entered into a derivative with the Visa Counterparty . Under the derivative, the Visa Counterparty is compensated by the Company for any decline in the conversion factor as a result of the outcome of the Litigation. Conversely, the Company is compensated by the Visa Counterparty for any increase in the conversion factor. The amount of payments made or received under the derivative is a function of the 3.2 million shares sold to the Visa Counterparty , the change in conversion rate, and Visa ’s share price. The Visa Counterparty , as a result of its ownership of the Class B shares , is impacted by dilutive adjustments to the conversion factor of the Class B shares caused by the Litigation losses. Additionally, the Company will make periodic payments based on the notional of the derivative and a fixed rate until the date on which the Litigation is settled. The fair value of the derivative is estimated based on unobservable inputs consisting of management's estimate of the probability of certain litigation scenarios and the timing of the resolution of the Litigation due in large part to the aforementioned decision by the U.S. Court of Appeals for the Second Circuit. The fair value of the derivative liability was $15 million at both December 31, 2017 and 2016 . The fair value of the derivative is estimated based on the Company's expectations regarding the resolution of the Litigation. The ultimate impact to the Company could be significantly different based on the Litigation outcome. Public Deposits The Company holds public deposits from various states in which it does business. Individual state laws require banks to collateralize public deposits, typically as a percentage of their public deposit balance in excess of FDIC insurance and may also require a cross-guarantee among all banks holding public deposits of the individual state. The amount of collateral required varies by state and may also vary by bank within each state, depending on the individual state's risk assessment of each participating bank. Certain of the states in which the Company holds public deposits use a pooled collateral method, whereby in the event of default of a bank holding public deposits, the collateral of the defaulting bank is liquidated to the extent necessary to recover the loss of public deposits of the defaulting bank. To the extent the collateral is insufficient, the remaining public deposit balances of the defaulting bank are recovered through an assessment of the other banks holding public deposits in that state. The maximum potential amount of future payments the Company could be required to make is dependent on a variety of factors, including the amount of public funds held by banks in the states in which the Company also holds public deposits and the amount of collateral coverage associated with any defaulting bank. Individual states appear to be monitoring this risk and evaluating collateral requirements; therefore, the likelihood that the Company would have to perform under this guarantee is dependent on whether any banks holding public funds default as well as the adequacy of collateral coverage. Other In the normal course of business, the Company enters into indemnification agreements and provides standard representations and warranties in connection with numerous transactions. These transactions include those arising from securitization activities, underwriting agreements, merger and acquisition agreements, swap clearing agreements, loan sales, contractual commitments, payment processing, sponsorship agreements, and various other business transactions or arrangements. The extent of the Company's obligations under these indemnification agreements depends upon the occurrence of future events; therefore, the Company's potential future liability under these arrangements is not determinable. STIS and STRH , broker-dealer affiliates of the Company, use a common third party clearing broker to clear and execute their customers' securities transactions and to hold customer accounts. Under their respective agreements, STIS and STRH agree to indemnify the clearing broker for losses that result from a customer's failure to fulfill its contractual obligations. As the clearing broker's rights to charge STIS and STRH have no maximum amount, the Company believes that the maximum potential obligation cannot be estimated. However, to mitigate exposure, the affiliate may seek recourse from the customer through cash or securities held in the defaulting customer's account. For the years ended December 31, 2017, 2016, and 2015 , STIS and STRH experienced minimal net losses as a result of the indemnity. The clearing agreements expire in May 2020 for both STIS and STRH .

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	NOTE 17 - DERIVATIVE FINANCIAL INSTRUMENTS The Company enters into various derivative financial instruments, both in a dealer capacity to facilitate client transactions and as an end user as a risk management tool. The Company generally manages the risk associated with these derivatives within the established MRM and credit risk management frameworks. Derivatives may be used by the Company to hedge various economic or client-related exposures. In such instances, derivative positions are typically monitored using a VAR methodology, with exposures reviewed daily. Derivatives are also used as a risk management tool to hedge the Company’s balance sheet exposure to changes in identified cash flow and fair value risks, either economically or in accordance with hedge accounting provisions. The Company’s Corporate Treasury function is responsible for employing the various hedge strategies to manage these objectives. The Company enters into IRLC s on residential and commercial mortgage loans that are accounted for as freestanding derivatives. Additionally, certain contracts containing embedded derivatives are measured, in their entirety, at fair value. All derivatives, including both freestanding as well as any embedded derivatives that the Company bifurcates from the host contracts, are measured at fair value in the Consolidated Balance Sheets in Trading assets and derivative instruments and Trading liabilities and derivative instruments. The associated gains and losses are either recognized in AOCI, net of tax, or within the Consolidated Statements of Income, depending upon the use and designation of the derivatives. Credit and Market Risk Associated with Derivative Instruments Derivatives expose the Company to risk that the counterparty to the derivative contract does not perform as expected. The Company manages its exposure to counterparty credit risk associated with derivatives by entering into transactions with counterparties with defined exposure limits based on their credit quality and in accordance with established policies and procedures. All counterparties are reviewed regularly as part of the Company’s credit risk management practices and appropriate action is taken to adjust the exposure limits to certain counterparties as necessary. The Company’s derivative transactions are generally governed by ISDA agreements or other legally enforceable industry standard master netting agreements. In certain cases and depending on the nature of the underlying derivative transactions, bilateral collateral agreements are also utilized. Furthermore, the Company and its subsidiaries are subject to OTC derivative clearing requirements, which require certain derivatives to be cleared through central clearing houses, such as LCH and the CME . These clearing houses require the Company to post initial and variation margin to mitigate the risk of non-payment, the latter of which is received or paid daily based on the net asset or liability position of the contracts. Effective January 3, 2017, the CME amended its rulebook to legally characterize variation margin cash payments for cleared OTC derivatives as settlement rather than as collateral. As a result, in the first quarter of 2017, the Company began reducing the corresponding derivative asset and liability balances for CME -cleared OTC derivatives to reflect the settlement of those positions via the exchange of variation margin. Variation margin cash payments for LCH -cleared OTC derivatives continue to be subject to collateral accounting and characterized by the Company as collateral through December 31, 2017. However, effective January 16, 2018, LCH amended its rulebook to legally characterize variation margin cash payments for cleared OTC derivatives as settlement rather than as collateral, consistent with the CME 's amended requirements. Accordingly, beginning in the first quarter of 2018, the Company will begin reducing the corresponding derivative asset and liability balances for LCH -cleared OTC derivatives to reflect the settlement of those positions via the exchange of variation margin. When the Company has more than one outstanding derivative transaction with a single counterparty, and there exists a legal right of offset with that counterparty, the Company considers its exposure to the counterparty to be the net fair value of its derivative positions with that counterparty. If the net fair value is positive, then the corresponding asset value also reflects cash collateral held. At December 31, 2017 , the economic exposure of these net derivative asset positions was $541 million , reflecting $940 million of net derivative gains, adjusted for cash and other collateral of $399 million that the Company held in relation to these positions. At December 31, 2016 , the economic exposure of net derivative asset positions was $774 million , reflecting $1.1 billion of net derivative gains, adjusted for cash and other collateral held of $339 million . Derivatives also expose the Company to market risk arising from the adverse effects that changes in market factors, such as interest rates, currency rates, equity prices, commodity prices, or implied volatility, may have on the value of a derivative. The Company manages this risk by establishing and monitoring limits on the types and degree of risk that may be undertaken. The Company measures its market risk exposure using a VAR methodology for derivatives designated as trading instruments. Other tools and risk measures are also used to actively manage risk associated with derivatives including scenario analysis and stress testing. Derivative instruments are priced using observable market inputs at a mid-market valuation point and take into consideration appropriate valuation adjustments for collateral, market liquidity, and counterparty credit risk. For purposes of determining fair value adjustments to its OTC derivative positions, the Company takes into consideration the credit profile and likelihood of default by counterparties and itself, as well as its net exposure, which considers legally enforceable master netting agreements and collateral along with remaining maturities. The expected loss of each counterparty is estimated using market-based views of counterparty default probabilities observed in the single-name CDS market, when available and of sufficient liquidity. When single-name CDS market data is not available or not of sufficient liquidity, the probability of default is estimated using a combination of the Company's internal risk rating system and sector/rating based CDS data. For purposes of estimating the Company’s own credit risk on derivative liability positions, the DVA , the Company uses probabilities of default from observable, sector/rating based CDS data. The Company adjusted the net fair value of its derivative contracts for estimates of both counterparty credit risk and its own credit risk by approximately $5 million and $6 million at December 31, 2017 and 2016 , respectively. For additional information on the Company's fair value measurements, see Note 18 , "Fair Value Election and Measurement." Currently, the majority of the Company’s derivatives contain contingencies that relate to the creditworthiness of the Bank. These contingencies, which are contained in industry standard master netting agreements, may be considered events of default. Should the Bank be in default under any of these provisions, the Bank’s counterparties would be permitted to close out transactions with the Bank on a net basis, at amounts that would approximate the fair values of the derivatives, resulting in a single sum due by one party to the other. The counterparties would have the right to apply any collateral posted by the Bank against any net amount owed by the Bank. Additionally, certain of the Company’s derivative liability positions, totaling $1.1 billion in fair value at both December 31, 2017 and 2016 , contain provisions conditioned on downgrades of the Bank’s credit rating. These provisions, if triggered, would either give rise to an ATE that permits the counterparties to close-out net and apply collateral or, where a CSA is present, require the Bank to post additional collateral. At December 31, 2017 , the Bank held senior long-term debt credit ratings of Baal / A- / A- from Moody’s , S&P , and Fitch , respectively. At December 31, 2017 , ATE s have been triggered for less than $1 million in fair value liabilities. The maximum additional liability that could be triggered from ATE s was approximately $17 million at December 31, 2017 . At December 31, 2017 , $1.1 billion in fair value of derivative liabilities were subject to CSA s, against which the Bank has posted $1.0 billion in collateral, primarily in the form of cash. If requested by the counterparty pursuant to the terms of the CSA , the Bank would be required to post additional collateral of approximately $2 million against these contracts if the Bank were downgraded to Baa3/BBB. Further downgrades to Ba1/BBB- would require the Bank to post an additional $2 million of collateral. Any further downgrades below Ba1/BBB- do not contain predetermined collateral posting levels. Notional and Fair Value of Derivative Positions The following tables present the Company’s derivative positions at December 31, 2017 and 2016 . The notional amounts in the tables are presented on a gross basis and have been classified within derivative assets or derivative liabilities based on the estimated fair value of the individual contract at December 31, 2017 and 2016 . Gross positive and gross negative fair value amounts associated with respective notional amounts are presented without consideration of any netting agreements, including collateral arrangements. Net fair value derivative amounts are adjusted on an aggregate basis, where applicable, to take into consideration the effects of legally enforceable master netting agreements, including any cash collateral received or paid, and are recognized in Trading assets and derivative instruments or Trading liabilities and derivative instruments on the Consolidated Balance Sheets. For contracts constituting a combination of options that contain a written option and a purchased option (such as a collar), the notional amount of each option is presented separately, with the purchased notional amount generally being presented as a derivative asset and the written notional amount being presented as a derivative liability. For other contracts that contain a combination of options, the fair value is generally presented as a single value with the purchased notional amount if the combined fair value is positive, and with the written notional amount if the combined fair value is negative. December 31, 2017 Asset Derivatives Liability Derivatives (Dollars in millions) Notional Amounts Fair Value Notional Amounts Fair Value Derivative instruments designated in cash flow hedging relationships 1 Interest rate contracts hedging floating rate LHFI $5,850 $2 $8,350 $252 Derivative instruments designated in fair value hedging relationships 2 Interest rate contracts hedging fixed rate debt 1,250 1 4,670 58 Interest rate contracts hedging brokered CDs 30 — 30 — Total 1,280 1 4,700 58 Derivative instruments not designated as hedging instruments 3 Interest rate contracts hedging: Residential MSRs 4 31,895 119 10,126 119 LHFS, IRLCs 5 4,550 9 3,040 6 LHFI 90 2 85 2 Trading activity 6 78,223 1,066 48,143 946 Foreign exchange rate contracts hedging loans and trading activity 3,409 110 3,649 102 Credit contracts hedging: LHFI — — 515 11 Trading activity 7 1,721 15 1,733 12 Equity contracts hedging trading activity 6 13,837 2,499 25,070 2,857 Other contracts: IRLCs and other 8 1,671 18 346 16 Commodity derivatives 712 63 710 61 Total 136,108 3,901 93,417 4,132 Total derivative instruments $143,238 $3,904 $106,467 $4,442 Total gross derivative instruments, before netting $3,904 $4,442 Less: Legally enforceable master netting agreements (2,731 ) (2,731 ) Less: Cash collateral received/paid (371 ) (1,303 ) Total derivative instruments, after netting $802 $408 1 See “Cash Flow Hedges” in this Note for further discussion. 2 See “Fair Value Hedges” in this Note for further discussion. 3 See “Economic Hedging and Trading Activities” in this Note for further discussion. 4 Amount includes $16.6 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 5 Amount includes $190 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 6 Amounts include $9.8 billion of notional amounts related to interest rate futures and $1.2 billion of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt. 7 Asset and liability amounts include $4 million and $11 million , respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor. 8 Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares , the conversion ratio from Class B shares to Class A shares , and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16 , “Guarantees” for additional information. December 31, 2016 Asset Derivatives Liability Derivatives (Dollars in millions) Notional Amounts Fair Value Notional Amounts Fair Value Derivative instruments designated in cash flow hedging relationships 1 Interest rate contracts hedging floating rate LHFI $6,400 $34 $11,050 $265 Derivative instruments designated in fair value hedging relationships 2 Interest rate contracts hedging fixed rate debt 600 2 4,510 81 Interest rate contracts hedging brokered CDs 60 — 30 — Total 660 2 4,540 81 Derivative instruments not designated as hedging instruments 3 Interest rate contracts hedging: Residential MSRs 4 12,165 413 18,774 335 LHFS, IRLCs 5 11,774 134 8,306 58 LHFI 100 2 36 1 Trading activity 6 70,599 1,536 67,477 1,401 Foreign exchange rate contracts hedging loans and trading activity 3,231 161 3,360 148 Credit contracts hedging: LHFI 15 — 620 8 Trading activity 7 2,128 34 2,271 33 Equity contracts hedging trading activity 6 17,225 2,095 28,658 2,477 Other contracts: IRLCs and other 8 2,412 28 668 22 Commodity derivatives 747 75 746 73 Total 120,396 4,478 130,916 4,556 Total derivative instruments $127,456 $4,514 $146,506 $4,902 Total gross derivative instruments, before netting $4,514 $4,902 Less: Legally enforceable master netting agreements (3,239 ) (3,239 ) Less: Cash collateral received/paid (291 ) (1,265 ) Total derivative instruments, after netting $984 $398 1 See “Cash Flow Hedges” in this Note for further discussion. 2 See “Fair Value Hedges” in this Note for further discussion. 3 See “Economic Hedging and Trading Activities” in this Note for further discussion. 4 Amount includes $6.7 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 5 Amount includes $720 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 6 Amounts include $12.3 billion of notional amounts related to interest rate futures and $629 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt. 7 Asset and liability amounts include $5 million and $13 million , respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor. 8 Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares , the conversion ratio from Class B shares to Class A shares , and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16 , “Guarantees” for additional information. Impact of Derivative Instruments on the Consolidated Statements of Income and Shareholders’ Equity The impacts of derivative instruments on the Consolidated Statements of Income and the Consolidated Statements of Shareholders’ Equity for the years ended December 31, 2017, 2016, and 2015 are presented in the following tables. The impacts are segregated between derivatives that are designated in hedge accounting relationships and those that are used for economic hedging or trading purposes, with further identification of the underlying risks in the derivatives and the hedged items, where appropriate. The tables do not disclose the financial impact of the activities that these derivative instruments are intended to hedge. Year Ended December 31, 2017 (Dollars in millions) Amount of Pre-tax Loss (Effective Portion) Amount of Pre-tax Gain Reclassified from AOCI into Income Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 ($54 ) $38 Interest and fees on loans held for investment 1 During the year ended December 31, 2017 , the Company also reclassified $51 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2017 (Dollars in millions) Amount of Loss on Derivatives Amount of Gain on Related Hedged Items Amount of Gain Recognized in Income on Hedges Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($38 ) $40 $2 Interest rate contracts hedging brokered CDs 1 — — — Total ($38 ) $40 $2 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2017 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $42 LHFS, IRLCs Mortgage production related income (54 ) Trading activity Trading income 42 Foreign exchange rate contracts hedging loans and trading activity Trading income (37 ) Credit contracts hedging: LHFI Other noninterest income (4 ) Trading activity Trading income 26 Other contracts: IRLCs and other Mortgage production related income, Commercial real estate related income 185 Commodity derivatives Trading income 1 Total $201 Year Ended December 31, 2016 (Dollars in millions) Amount of Pre-tax Loss Recognized in OCI on Derivatives (Effective Portion) Amount of Pre-tax Gain Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 ($145 ) $147 Interest and fees on loans held for investment 1 During the year ended December 31, 2016 , the Company also reclassified $97 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2016 (Dollars in millions) Amount of Loss on Derivatives Amount of Gain Amount of Gain Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($87 ) $89 $2 Interest rate contracts hedging brokered CDs 1 — — — Total ($87 ) $89 $2 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2016 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $62 LHFS, IRLCs Mortgage production related income (6 ) LHFI Other noninterest income (1 ) Trading activity Trading income 51 Foreign exchange rate contracts hedging loans and trading activity Trading income 101 Credit contracts hedging: LHFI Other noninterest income (3 ) Trading activity Trading income 19 Equity contracts hedging trading activity Trading income 4 Other contracts: IRLCs Mortgage production related income 210 Commodity derivatives Trading income 3 Total $440 Year Ended December 31, 2015 (Dollars in millions) Amount of Pre-tax Gain Recognized in OCI on Derivatives (Effective Portion) Amount of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 $246 $169 Interest and fees on loans held for investment 1 During the year ended December 31, 2015 , the Company also reclassified $92 million pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2015 (Dollars in millions) Amount of Loss on Derivatives Recognized in Income Amount of Gain on Related Hedged Items Amount of Loss Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($2 ) $1 ($1 ) Interest rate contracts hedging brokered CDs 1 — — — Total ($2 ) $1 ($1 ) 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2015 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $19 LHFS, IRLCs Mortgage production related income (45 ) LHFI Other noninterest income (1 ) Trading activity Trading income 61 Foreign exchange rate contracts hedging loans and trading activity Trading income 93 Credit contracts hedging: LHFI Other noninterest income (1 ) Trading activity Trading income 23 Equity contracts hedging trading activity Trading income 4 Other contracts: IRLCs Mortgage production related income 156 Commodities Trading income 2 Total $311 Netting of Derivative Instruments The Company has various financial assets and financial liabilities that are subject to enforceable master netting agreements or similar agreements. The Company's securities borrowed or purchased under agreements to resell, and securities sold under agreements to repurchase, that are subject to enforceable master netting agreements or similar agreements, are discussed in Note 3 , "Federal Funds Sold and Securities Financing Activities." The Company enters into ISDA or other legally enforceable industry standard master netting agreements with derivative counterparties. Under the terms of the master netting agreements, all transactions between the Company and the counterparty constitute a single business relationship such that in the event of default, the nondefaulting party is entitled to set off claims and apply property held by that party in respect of any transaction against obligations owed. Any payments, deliveries, or other transfers may be applied against each other and netted. The following tables present total gross derivative instrument assets and liabilities at December 31, 2017 and 2016 , which are adjusted to reflect the effects of legally enforceable master netting agreements and cash collateral received or paid when calculating the net amount reported in the Consolidated Balance Sheets. Also included in the tables are financial instrument collateral related to legally enforceable master netting agreements that represents securities collateral received or pledged and customer cash collateral held at third party custodians. These amounts are not offset on the Consolidated Balance Sheets but are shown as a reduction to total derivative instrument assets and liabilities to derive net derivative assets and liabilities. These amounts are limited to the derivative asset/liability balance, and accordingly, do not include excess collateral received/pledged. (Dollars in millions) Gross Amount Amount Offset Net Amount Presented in Consolidated Balance Sheets Held/Pledged Financial Instruments Net Amount December 31, 2017 Derivative instrument assets: Derivatives subject to master netting arrangement or similar arrangement $3,491 $2,923 $568 $28 $540 Derivatives not subject to master netting arrangement or similar arrangement 18 — 18 — 18 Exchange traded derivatives 395 179 216 — 216 Total derivative instrument assets $3,904 $3,102 $802 1 $28 $774 Derivative instrument liabilities: Derivatives subject to master netting arrangement or similar arrangement $4,128 $3,855 $273 $27 $246 Derivatives not subject to master netting arrangement or similar arrangement 130 — 130 — 130 Exchange traded derivatives 184 179 5 — 5 Total derivative instrument liabilities $4,442 $4,034 $408 2 $27 $381 December 31, 2016 Derivative instrument assets: Derivatives subject to master netting arrangement or similar arrangement $4,193 $3,384 $809 $48 $761 Derivatives not subject to master netting arrangement or similar arrangement 27 — 27 — 27 Exchange traded derivatives 294 146 148 — 148 Total derivative instrument assets $4,514 $3,530 $984 1 $48 $936 Derivative instrument liabilities: Derivatives subject to master netting arrangement or similar arrangement $4,649 $4,358 $291 $33 $258 Derivatives not subject to master netting arrangement or similar arrangement 105 — 105 — 105 Exchange traded derivatives 148 146 2 — 2 Total derivative instrument liabilities $4,902 $4,504 $398 2 $33 $365 1 At December 31, 2017 , $802 million , net of $371 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016 , $984 million , net of $291 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. 2 At December 31, 2017 , $408 million , net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016 , $398 million , net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. Credit Derivative Instruments As part of the Company's trading businesses, the Company enters into contracts that are, in form or substance, written guarantees; specifically, CDS , risk participations, and TRS . The Company accounts for these contracts as derivatives, and accordingly, records these contracts at fair value, with changes in fair value recognized in Trading income in the Consolidated Statements of Income. At December 31, 2017 and 2016 , the gross notional amount of purchased CDS contracts designated as trading instruments was $5 million and $135 million , respectively. The fair value of purchased CDS was immaterial at December 31, 2017 and $3 million at December 31, 2016 . The Company has also entered into TRS contracts on loans. The Company’s TRS business consists of matched trades, such that when the Company pays depreciation on one TRS , it receives the same amount on the matched TRS . To mitigate its credit risk, the Company typically receives initial cash collateral from the counterparty upon entering into the TRS and is entitled to additional collateral if the fair value of the underlying reference assets deteriorates. There were $1.7 billion and $2.1 billion of outstanding TRS notional balances at December 31, 2017 and 2016 , respectively. The fair values of these TRS assets and liabilities at December 31, 2017 were $15 million and $13 million , respectively, and related cash collateral held at December 31, 2017 was $368 million . The fair values of the TRS assets and liabilities at December 31, 2016 were $34 million and $31 million , respectively, and related cash collateral held at December 31, 2016 was $450 million . For additional information on the Company's TRS contracts, see Note 10 , "Certain Transfers of Financial Assets and Variable Interest Entities," as well as Note 18 , "Fair Value Election and Measurement." The Company writes risk participations, which are credit derivatives, whereby the Company has guaranteed payment to a dealer counterparty in the event the counterparty experiences a loss on a derivative, such as an interest rate swap, due to a failure to pay by the counterparty’s customer (the “obligor”) on that derivative. The Company manages its payment risk on its risk participations by monitoring the creditworthiness of the obligors, which are all corporations or partnerships, through the normal credit review process that the Company would have performed had it entered into a derivative directly with the obligors. To date, no material losses have been incurred related to the Company’s written risk participations. At December 31, 2017 , the remaining terms on these risk participations generally ranged from less than one year to nine years, with a weighted average term on the maximum estimated exposure of 5.5 years. At December 31, 2016 , the remaining terms on these risk participations generally ranged from less than one year to thirty-one years, with a weighted average term on the maximum estimated exposure of 8.5 years. The Company’s maximum estimated exposure to written risk participations, as measured by projecting a maximum value of the guaranteed derivative instruments based on interest rate curve simulations and assuming 100% default by all obligors on the maximum values, was approximately $55 million and $95 million at December 31, 2017 and 2016 , respectively. The fair values of the written risk participations were immaterial at both December 31, 2017 and 2016 . Cash Flow Hedging Instruments The Company utilizes a comprehensive risk management strategy to monitor sensitivity of earnings to movements in interest rates. Specific types of funding and principal amounts hedged are determined based on prevailing market conditions and the shape of the yield curve. In conjunction with this strategy, the Company may employ various interest rate derivatives as risk management tools to hedge interest rate risk from recognized assets and liabilities or from forecasted transactions. The terms and notional amounts of derivatives are determined based on management’s assessment of future interest rates, as well as other factors. Interest rate swaps have been designated as hedging the exposure to the benchmark interest rate risk associated with floating rate loans. At December 31, 2017 , the maturities for hedges of floating rate loans ranged from less than one year to five years, with the weighted average being 3.6 years. At December 31, 2016 , the maturities for hedges of floating rate loans ranged from less than one year to six years, with the weighted average being 4.1 years. These hedges have been highly effective in offsetting the designated risks, yielding an immaterial amount of ineffect

Fair Value Election and Measure

Fair Value Election and Measurement	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Election and Measurement	NOTE 18 - FAIR VALUE ELECTION AND MEASUREMENT The Company measures certain assets and liabilities at fair value, which are classified as level 1, 2, or 3 within the fair value hierarchy, as shown below, on the basis of whether the measurement employs observable or unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s own assumptions, taking into account information about market participant assumptions that is readily available. • Level 1: Quoted prices for identical instruments in active markets • Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets • Level 3: Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable Fair value is defined as 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 measurement date. The Company’s recurring fair value measurements are based on either a requirement to measure such assets and liabilities at fair value or on the Company’s election to measure certain financial assets and liabilities at fair value. Assets and liabilities that are required to be measured at fair value on a recurring basis include trading securities, securities AFS, and derivative financial instruments. Assets and liabilities that the Company has elected to measure at fair value on a recurring basis include its residential MSRs, trading loans, and certain LHFS, LHFI, brokered time deposits, and fixed rate debt issuances. The Company elects to measure certain assets and liabilities at fair value to better align its financial performance with the economic value of actively traded or hedged assets or liabilities. The use of fair value also enables the Company to mitigate non-economic earnings volatility caused from financial assets and liabilities being measured using different bases of accounting, as well as to more accurately portray the active and dynamic management of the Company’s balance sheet. The Company uses various valuation techniques and assumptions in estimating fair value. The assumptions used to estimate the value of an instrument have varying degrees of impact to the overall fair value of an asset or liability. This process involves gathering multiple sources of information, including broker quotes, values provided by pricing services, trading activity in other identical or similar securities, market indices, and pricing matrices. When observable market prices for the asset or liability are not available, the Company employs various modeling techniques, such as discounted cash flow analyses, to estimate fair value. Models used to produce material financial reporting information are validated prior to use and following any material change in methodology. Their performance is monitored at least quarterly, and any material deterioration in model performance is escalated. This review is performed by different internal groups depending on the type of fair value asset or liability. The Company has formal processes and controls in place to support the appropriateness of its fair value estimates. For fair values obtained from a third party, or those that include certain trader estimates of fair value, there is an independent price validation function that provides oversight for these estimates. For level 2 instruments and certain level 3 instruments, the validation generally involves evaluating pricing received from two or more third party pricing sources that are widely used by market participants. The Company evaluates this pricing information from both a qualitative and quantitative perspective and determines whether any pricing differences exceed acceptable thresholds. If thresholds are exceeded, the Company assesses differences in valuation approaches used, which may include contacting a pricing service to gain further insight into the valuation of a particular security or class of securities to resolve the pricing variance, which could include an adjustment to the price used for financial reporting purposes. The Company classifies instruments within level 2 in the fair value hierarchy when it determines that external pricing sources estimated fair value using prices for similar instruments trading in active markets. A wide range of quoted values from pricing sources may imply a reduced level of market activity and indicate that significant adjustments to price indications have been made. In such cases, the Company evaluates whether the asset or liability should be classified as level 3. Determining whether to classify an instrument as level 3 involves judgment and is based on a variety of subjective factors, including whether a market is inactive. A market is considered inactive if significant decreases in the volume and level of activity for the asset or liability have been observed. In making this determination the Company evaluates the number of recent transactions in either the primary or secondary market, whether or not price quotations are current, the nature of market participants, the variability of price quotations, the breadth of bid/ask spreads, declines in, or the absence of, new issuances, and the availability of public information. When a market is determined to be inactive, significant adjustments may be made to price indications when estimating fair value. In making these adjustments the Company seeks to employ assumptions a market participant would use to value the asset or liability, including consideration of illiquidity in the referenced market. Recurring Fair Value Measurements The following tables present certain information regarding assets and liabilities measured at fair value on a recurring basis and the changes in fair value for those specific financial instruments for which fair value has been elected. December 31, 2017 Fair Value Measurements (Dollars in millions) Level 1 Level 2 Level 3 Netting Adjustments 1 Assets/Liabilities at Fair Value Assets Trading assets and derivative instruments: U.S. Treasury securities $157 $— $— $— $157 Federal agency securities — 395 — — 395 U.S. states and political subdivisions — 61 — — 61 MBS - agency — 700 — — 700 Corporate and other debt securities — 655 — — 655 CP — 118 — — 118 Equity securities 56 — — — 56 Derivative instruments 395 3,493 16 (3,102 ) 802 Trading loans — 2,149 — — 2,149 Total trading assets and derivative instruments 608 7,571 16 (3,102 ) 5,093 Securities AFS: U.S. Treasury securities 4,331 — — — 4,331 Federal agency securities — 259 — — 259 U.S. states and political subdivisions — 617 — — 617 MBS - agency residential — 22,704 — — 22,704 MBS - agency commercial — 2,086 — — 2,086 MBS - non-agency residential — — 59 — 59 MBS - non-agency commercial — 866 — — 866 ABS — — 8 — 8 Corporate and other debt securities — 12 5 — 17 Other equity securities 2 51 — 418 — 469 Total securities AFS 4,382 26,544 490 — 31,416 LHFS — 1,577 — — 1,577 LHFI — — 196 — 196 Residential MSRs — — 1,710 — 1,710 Liabilities Trading liabilities and derivative instruments: U.S. Treasury securities 577 — — — 577 Corporate and other debt securities — 289 — — 289 Equity securities 9 — — — 9 Derivative instruments 183 4,243 16 (4,034 ) 408 Total trading liabilities and derivative instruments 769 4,532 16 (4,034 ) 1,283 Brokered time deposits — 236 — — 236 Long-term debt — 530 — — 530 1 Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17 , "Derivative Financial Instruments," for additional information. 2 Includes $49 million of mutual fund investments, $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, and $2 million of other. December 31, 2016 Fair Value Measurements (Dollars in millions) Level 1 Level 2 Level 3 Netting Adjustments 1 Assets/Liabilities at Fair Value Assets Trading assets and derivative instruments: U.S. Treasury securities $539 $— $— $— $539 Federal agency securities — 480 — — 480 U.S. states and political subdivisions — 134 — — 134 MBS - agency — 567 — — 567 CLO securities — 1 — — 1 Corporate and other debt securities — 656 — — 656 CP — 140 — — 140 Equity securities 49 — — — 49 Derivative instruments 293 4,193 28 (3,530 ) 984 Trading loans — 2,517 — — 2,517 Total trading assets and derivative instruments 881 8,688 28 (3,530 ) 6,067 Securities AFS: U.S. Treasury securities 5,405 — — — 5,405 Federal agency securities — 313 — — 313 U.S. states and political subdivisions — 275 4 — 279 MBS - agency residential — 22,436 — — 22,436 MBS - agency commercial — 1,226 — — 1,226 MBS - non-agency residential — — 74 — 74 MBS - non-agency commercial — 252 — — 252 ABS — — 10 — 10 Corporate and other debt securities — 30 5 — 35 Other equity securities 2 102 — 540 — 642 Total securities AFS 5,507 24,532 633 — 30,672 LHFS — 3,528 12 — 3,540 LHFI — — 222 — 222 Residential MSRs — — 1,572 — 1,572 Liabilities Trading liabilities and derivative instruments: U.S. Treasury securities 697 — — — 697 MBS - agency — 1 — — 1 Corporate and other debt securities — 255 — — 255 Derivative instruments 149 4,731 22 (4,504 ) 398 Total trading liabilities and derivative instruments 846 4,987 22 (4,504 ) 1,351 Brokered time deposits — 78 — — 78 Long-term debt — 963 — — 963 1 Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17 , "Derivative Financial Instruments," for additional information. 2 Includes $102 million of mutual fund investments, $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $6 million of other. The following tables present the difference between fair value and the aggregate UPB for which the FVO has been elected for certain trading loans, LHFS, LHFI, brokered time deposits, and long-term debt instruments. (Dollars in millions) Fair Value at December 31, 2017 Aggregate UPB at December 31, 2017 Fair Value Over/(Under) Unpaid Principal Assets: Trading loans $2,149 $2,111 $38 LHFS: Accruing 1,576 1,533 43 Past due 90 days or more 1 1 — LHFI: Accruing 192 198 (6 ) Nonaccrual 4 6 (2 ) Liabilities: Brokered time deposits 236 233 3 Long-term debt 530 517 13 (Dollars in millions) Fair Value at December 31, 2016 Aggregate UPB at December 31, 2016 Fair Value Over/(Under) Unpaid Principal Assets: Trading loans $2,517 $2,488 $29 LHFS: Accruing 3,540 3,516 24 LHFI: Accruing 219 225 (6 ) Nonaccrual 3 4 (1 ) Liabilities: Brokered time deposits 78 80 (2 ) Long-term debt 963 924 39 The following tables present the change in fair value during the years ended December 31, 2017, 2016, and 2015 of financial instruments for which the FVO has been elected, as well as for residential MSRs. The tables do not reflect the change in fair value attributable to related economic hedges that the Company uses to mitigate market-related risks associated with the financial instruments. Generally, changes in the fair value of economic hedges are recognized in Trading income, Mortgage production related income, Mortgage servicing related income, Commercial real estate related income, or Other noninterest income as appropriate, and are designed to partially offset the change in fair value of the financial instruments referenced in the tables below. The Company’s economic hedging activities are deployed at both the instrument and portfolio level. Fair Value Gain/(Loss) for the Year Ended December 31, 2017 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Income Mortgage 1 Mortgage Servicing Related Income Other Noninterest Income Total Changes in Fair Values Included in Earnings 2 Assets: Trading loans $21 $— $— $— $21 LHFS — 61 — — 61 Residential MSRs — 5 (248 ) — (243 ) Liabilities: Long-term debt 21 — — — 21 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2017 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2017 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income. Fair Value Gain/(Loss) for the Year Ended December 31, 2016 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Mortgage 1 Mortgage Other Total 2 Assets: Trading loans $15 $— $— $— $15 LHFS — 75 — — 75 Residential MSRs — 3 (245 ) — (242 ) Liabilities: Brokered time deposits 4 — — — 4 Long-term debt 27 — — — 27 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2016 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2016 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, brokered time deposits, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income. Fair Value (Loss)/Gain for the Year Ended December 31, 2015 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Mortgage 1 Mortgage Other Total 2 Assets: Trading loans ($1 ) $— $— $— ($1 ) LHFS — 44 — — 44 LHFI — — — 5 5 Residential MSRs — 2 (242 ) — (240 ) Liabilities: Long-term debt 41 — — — 41 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2015 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2015 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, LHFI, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income. The following is a discussion of the valuation techniques and inputs used in estimating fair value for assets and liabilities measured at fair value on a recurring basis and classified as level 1, 2, and/or 3. Trading Assets and Derivative Instruments and Securities Available for Sale Unless otherwise indicated, trading assets are priced by the trading desk and securities AFS are valued by an independent third party pricing service. The third party pricing service gathers relevant market data and observable inputs, such as new issue data, benchmark curves, reported trades, credit spreads, and dealer bids and offers, and integrates relevant credit information, perceived market movements, and sector news into its matrix pricing and other market-based modeling techniques. U.S. Treasury Securities The Company estimates the fair value of its U.S. Treasury securities based on quoted prices observed in active markets; as such, these investments are classified as level 1. Federal Agency Securities The Company includes in this classification securities issued by federal agencies and GSE s. Agency securities consist of debt obligations issued by HUD , FHLB , and other agencies or collateralized by loans that are guaranteed by the SBA and are, therefore, backed by the full faith and credit of the U.S. government. For SBA instruments, the Company estimates fair value based on pricing from observable trading activity for similar securities or from a third party pricing service. Accordingly, the Company classified these instruments as level 2. U.S. States and Political Subdivisions The Company’s investments in U.S. states and political subdivisions (collectively “municipals”) include obligations of county and municipal authorities and agency bonds, which are general obligations of the municipality or are supported by a specified revenue source. Holdings are geographically dispersed, with no significant concentrations in any one state or municipality. Additionally, all AFS municipal obligations classified as level 2 are highly rated or are otherwise collateralized by securities backed by the full faith and credit of the federal government. At December 31, 2016 , the Company had an immaterial amount of bonds classified as level 3 AFS municipal securities. These level 3 AFS municipal securities were redeemable with the issuer at par and could not be traded in the market. As such, no significant observable market data for these instruments was available; therefore, these securities were priced at par. At December 31, 2017 , the Company had no level 3 AFS municipal securities as these instruments matured during the second quarter of 2017. MBS – Agency Agency MBS includes pass-through securities and collateralized mortgage obligations issued by GSE s and U.S. government agencies, such as Fannie Mae , Freddie Mac , and Ginnie Mae . Each security contains a guarantee by the issuing GSE or agency. For agency MBS , the Company estimates fair value based on pricing from observable trading activity for similar securities or from a third party pricing service; accordingly, the Company has classified these instruments as level 2. MBS – Non-agency Non-agency residential MBS includes purchased interests in third party securitizations, as well as retained interests in Company-sponsored securitizations of 2006 and 2007 vintage residential mortgages (including both prime jumbo fixed rate collateral and floating rate collateral). At the time of purchase or origination, these securities had high investment grade ratings; however, through the most recent financial crisis, they experienced deterioration in credit quality leading to downgrades to non-investment grade levels. The Company obtains pricing for these securities from an independent pricing service. The Company evaluates third party pricing to determine the reasonableness of the information relative to changes in market data, such as any recent trades, information received from market participants and analysts, and/or changes in the underlying collateral performance. The Company continued to classify non-agency residential MBS as level 3, as the Company believes that available third party pricing relies on significant unobservable assumptions, as evidenced by a persistently wide bid-ask price range and variability in pricing from the pricing services, particularly for the vintage and exposures held by the Company. Non-agency commercial MBS consists of purchased interests in third party securitizations. These interests have high investment grade ratings, and the Company obtains pricing for these securities from an independent pricing service. The Company has classified these non-agency commercial MBS as level 2, as the third party pricing service relies on observable data for similar securities in active markets. CLO Securities CLO preference share exposure was estimated at fair value based on pricing from observable trading activity for similar securities. Accordingly, the Company classified these instruments as level 2 at December 31, 2016 . Asset-Backed Securities ABS classified as securities AFS includes purchased interests in third party securitizations collateralized by home equity loans and are valued based on third party pricing with significant unobservable assumptions; as such, they are classified as level 3. Corporate and Other Debt Securities Corporate debt securities are comprised predominantly of senior and subordinate debt obligations of domestic corporations and are classified as level 2. Other debt securities classified as AFS in level 3 at December 31, 2017 and 2016 include bonds that are redeemable with the issuer at par and cannot be traded in the market. As such, observable market data for these instruments is not available. Commercial Paper The Company acquires CP that is generally short-term in nature (maturity of less than 30 days) and highly rated. The Company estimates the fair value of this CP based on observable pricing from executed trades of similar instruments; as such, CP is classified as level 2. Equity Securities The Company estimates the fair value of its equity securities classified as trading assets based on quoted prices observed in active markets; accordingly, these investments are classified as level 1. Other equity securities classified as securities AFS include primarily FHLB of Atlanta stock and Federal Reserve Bank of Atlanta stock, which are redeemable with the issuer at cost and cannot be traded in the market; as such, these instruments are classified as level 3. The Company accounts for the stock based on industry guidance that requires these investments be carried at cost and evaluated for impairment based on the ultimate recovery of cost. The Company estimates the fair value of its mutual fund investments and certain other equity securities classified as securities AFS based on quoted prices observed in active markets; therefore, these investments are classified as level 1. Derivative Instruments The Company holds derivative instruments for both trading and risk management purposes. Level 1 derivative instruments generally include exchange-traded futures or option contracts for which pricing is readily available. The Company’s level 2 instruments are predominantly OTC swaps, options, and forwards, measured using observable market assumptions for interest rates, foreign exchange, equity, and credit. Because fair values for OTC contracts are not readily available, the Company estimates fair values using internal, but standard, valuation models. The selection of valuation models is driven by the type of contract: for option-based products, the Company uses an appropriate option pricing model such as Black-Scholes. For forward-based products, the Company’s valuation methodology is generally a discounted cash flow approach. The Company's derivative instruments classified as level 2 are primarily transacted in the institutional dealer market and priced with observable market assumptions at a mid-market valuation point, with appropriate valuation adjustments for liquidity and credit risk. See Note 17 , “Derivative Financial Instruments, ” for additional information on the Company's derivative instruments. The Company's derivative instruments classified as level 3 include IRLC s that satisfy the criteria to be treated as derivative financial instruments. The fair value of IRLC s on LHFS, while based on interest rates observable in the market, is highly dependent on the ultimate closing of the loans. These “pull-through” rates are based on the Company’s historical data and reflect the Company’s best estimate of the likelihood that a commitment will result in a closed loan. As pull-through rates increase, the fair value of IRLC s also increases. Servicing value is included in the fair value of IRLC s, and the fair value of servicing is determined by projecting cash flows, which are then discounted to estimate an expected fair value. The fair value of servicing is impacted by a variety of factors, including prepayment assumptions, discount rates, delinquency rates, contractually specified servicing fees, servicing costs, and underlying portfolio characteristics. Because these inputs are not transparent in market trades, IRLC s are considered to be level 3 assets. During the years ended December 31, 2017 and 2016 , the Company transferred $191 million and $211 million , respectively, of net IRLC s out of level 3 as the associated loans were closed. Trading Loans The Company engages in certain businesses whereby electing to measure loans at fair value for financial reporting aligns with the underlying business purpose. Specifically, loans included within this classification include trading loans that are (i) made or acquired in connection with the Company’s TRS business, (ii) part of the loan sales and trading business within the Company’s Wholesale segment, or (iii) backed by the SBA . See Note 10 , "Certain Transfers of Financial Assets and Variable Interest Entities," and Note 17 , “Derivative Financial Instruments,” for further discussion of this business. All of these loans are classified as level 2 due to the nature of market data that the Company uses to estimate fair value. The loans made in connection with the Company’s TRS business are short-term, senior demand loans supported by a pledge agreement granting first priority security interest to the Bank in all the assets held by the borrower, a VIE with assets comprised primarily of corporate loans. While these TRS -related loans do not trade in the market, the Company believes that the par amount of the loans approximates fair value and no unobservable assumptions are used by the Company to value these loans. At December 31, 2017 and 2016 , the Company had $1.7 billion and $2.1 billion of these short-term loans outstanding, measured at fair value, respectively. The loans from the Company’s sales and trading business are commercial and corporate leveraged loans that are either traded in the market or for which similar loans trade. The Company elected to measure these loans at fair value since they are actively traded. For each of the years ended December 31, 2017, 2016, and 2015 , the Company recognized an immaterial amount of gains/(losses) in the Consolidated Statements of Income due to changes in fair value attributable to instrument-specific credit risk. The Company is able to obtain fair value estimates for substantially all of these loans through a third party valuation service that is broadly used by market participants. While most of the loans are traded in the market, the Company does not believe that trading activity qualifies the loans as level 1 instruments, as the volume and level of trading activity is subject to variability and the loans are not exchange-traded. At December 31, 2017 and 2016 , $48 million and $46 million , respectively, of loans related to the Company’s trading business were held in inventory. SBA loans are similar to SBA securities discussed herein under “Federal agency securities,” except for their legal form. In both cases, the Company trades instruments that are fully guaranteed by the U.S. government as to contractual principal and interest and there is sufficient observable trading activity upon which to base the estimate of fair value. As these SBA loans are fully guaranteed, the changes in fair value are attributable to factors other than instrument-specific credit risk. At December 31, 2017 and 2016 , the Company held $368 million and $310 million of SBA loans in inventory, respectively. Loans Held for Sale and Loans Held for Investment Residential Mortgage LHFS The Company values certain newly-originated residential mortgage LHFS at fair value based upon defined product criteria. The Company chooses to fair value these residential mortgage LHFS to eliminate the complexities and inherent difficulties of achieving hedge accounting and to better align reported results with the underlying economic changes in value of the loans and related hedge instruments. Any origination fees are recognized within Mortgage production related income in the Consolidated Statements of Income when earned at the time of closing. The servicing value is included in the fair value of the loan and is initially recognized at the time the Company enters into IRLC s with borrowers. The Company employs derivative instruments to economically hedge changes in interest rates and the related impact on servicing value in the fair value of the loan. The mark-to-market adjustments related to LHFS and the associated economic hedges are captured in Mortgage production related income. LHFS classified as level 2 are primarily agency loans which trade in active secondary markets and are priced using current market pricing for similar securities, adjusted for servicing, interest rate risk, and credit risk. Non-agency residential mortgage LHFS are also included in level 2. The Company transferred certain residential mortgage LHFS into level 3 during the years ended December 31, 2017 and 2016 . These transfers were largely due to borrower defaults or the identification of other loan defects impacting the marketability of the loans. At December 31, 2017 , the Company had no residential mortgage LHFS classified as level 3 AFS as these loans were sold or transferred out of level 3 during 2017 . For residential mortgages that the Company has elected to measure at fair value, the Company recognized an immaterial amount of gains/(losses) in the Consolidated Statements of Income due to changes in fair value attributable to borrower-specific credit risk for each of the years ended December 31, 2017, 2016, and 2015 . In addition to borrower-specific credit risk, there are other more significant variables that drive changes in the fair values of the loans, including interest rates and general market conditions. Commercial Mortgage LHFS The Company values certain commercial mortgage LHFS at fair value based upon observable current market prices for similar loans. These loans are generally transferred to agencies within 90 days of origination. The Company had commitments from agencies to purchase these loans at December 31, 2017 and 2016 ; therefore, they are classified as level 2. Origination fees are recognized within commercial real estate related income in the Consolidated Statements of Income when earned at the time of closing. To mitigate the effect of interest rate risk inherent in entering into IRLCs with borrowers, the Company enters into forward contracts with investors at the same time that it enters into IRLCs with borrowers. The mark-to-market adjustments related to commercial mortgage LHFS, IRLCs, and forward contracts are recognized in Commercial real estate related income. For commercial mortgages that the Company has elected to measure at fair value, the Company recognized no gains/(losses) in the Consolidated Statements of Income due to changes in fair value attributable to borrower-specific credit risk for each the years ended December 31, 2017, 2016, and 2015 . LHFI LHFI classified as level 3 includes predominantly mortgage loans that are not marketable, largely due to the identification of loan defects. The Company chooses to measure these mortgage LHFI at fair value to better align reported results with the underlying economic changes in value of the loans and any related hedging instruments. The Company values these loans using a discounted cash flow approach based on assumptions that are generally not observable in current markets, such as prepayment speeds, default rates, loss severity rates, and discount rates. Level 3 LHFI also includes mortgage loans that are valued using collateral based pricing. Changes in the applicable housing price index since the time of the loan origination are considered and applied to the loan's collateral value. An additional discount representing the return that a buyer would require is also considered in the overall fair value. Residential Mortgage Servicing Rights The Company records residential MSR assets at fair value using a discounted cash flow approach. The fair values of residential MSRs are impacted by a variety of factors, including prepayment assumptions, discount rates, delinquency rates, contractually specified servicing fees, servicing costs, and underlying portfolio characteristics. The underlying assumptions and estimated values are corroborated by values received from independent third parties based on their review of the servicing portfolio, and comparisons to market transactions. Because these inputs are not transparent in market trades, residential MSRs are classified as level 3 assets. For additional information see Note 9 , "Goodwill and Other Intangible Assets." Liabilities Trading Liabilities and Derivative Instruments Trading liabilities are comprised primarily of derivative contracts, including IRLC s that satisfy the criteria to be treated as derivative financial instruments, as

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	NOTE 19 – CONTINGENCIES Litigation and Regulatory Matters In the ordinary course of business, the Company and its subsidiaries are parties to numerous civil claims and lawsuits and subject to regulatory examinations, investigations, and requests for information. Some of these matters involve claims for substantial amounts. The Company’s experience has shown that the damages alleged by plaintiffs or claimants are often overstated, based on unsubstantiated legal theories, unsupported by facts, and/or bear no relation to the ultimate award that a court might grant. Additionally, the outcome of litigation and regulatory matters and the timing of ultimate resolution are inherently difficult to predict. These factors make it difficult for the Company to provide a meaningful estimate of the range of reasonably possible outcomes of claims in the aggregate or by individual claim. However, on a case-by-case basis, reserves are established for those legal claims in which it is probable that a loss will be incurred and the amount of such loss can be reasonably estimated. The Company's financial statements at December 31, 2017 reflect the Company's current best estimate of probable losses associated with these matters, including costs to comply with various settlement agreements, where applicable. The actual costs of resolving these claims may be substantially higher or lower than the amounts reserved. For a limited number of legal matters in which the Company is involved, the Company is able to estimate a range of reasonably possible losses in excess of related reserves, if any. Management currently estimates these losses to range from $0 to approximately $160 million . This estimated range of reasonably possible losses represents the estimated possible losses over the life of such legal matters, which may span a currently indeterminable number of years, and is based on information available at December 31, 2017 . The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which an estimate is not possible are not included within this estimated range; therefore, this estimated range does not represent the Company’s maximum loss exposure. Based on current knowledge, it is the opinion of management that liabilities arising from legal claims in excess of the amounts currently reserved, if any, will not have a material impact on the Company’s financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters and the large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to the Company’s financial condition, results of operations, or cash flows for any given reporting period. The following is a description of certain litigation and regulatory matters: Card Association Antitrust Litigation The Company is a defendant, along with Visa and MasterCard , as well as several other banks, in several antitrust lawsuits challenging their practices. For a discussion regarding the Company’s involvement in this litigation matter, see Note 16 , “Guarantees.” Bickerstaff v. SunTrust Bank This case was filed in the Fulton County State Court on July 12, 2010, and an amended complaint was filed on August 9, 2010. Plaintiff asserts that all overdraft fees charged to his account which related to debit card and ATM transactions are actually interest charges and therefore subject to the usury laws of Georgia. Plaintiff has brought claims for violations of civil and criminal usury laws, conversion, and money had and received, and purports to bring the action on behalf of all Georgia citizens who incurred such overdraft fees within the four years before the complaint was filed where the overdraft fee resulted in an interest rate being charged in excess of the usury rate. On April 8, 2013, the plaintiff filed a motion for class certification and that motion was denied but the ruling was later reversed and remanded by the Georgia Supreme Court. On October 6, 2017, the trial court granted plaintiff's motion for class certification and the Bank filed an appeal of the decision on November 3, 2017. ERISA Class Actions Company Stock Class Action Beginning in July 2008, the Company and certain officers, directors, and employees of the Company were named in a class action alleging that they breached their fiduciary duties under ERISA by offering the Company's common stock as an investment option in the SunTrust Banks, Inc. 401(k) Plan (the “Plan”). The plaintiffs sought to represent all current and former Plan participants who held the Company stock in their Plan accounts from May 15, 2007 to March 30, 2011 and seek to recover alleged losses these participants supposedly incurred as a result of their investment in Company stock. This case was originally filed in the U.S. District Court for the Southern District of Florida but was transferred to the U.S. District Court for the Northern District of Georgia, Atlanta Division (the “District Court”), in November 2008. Since the filing of the case, various amended pleadings, motions, and appeals were made by the parties that ultimately resulted in the District Court granting a motion for summary judgment for certain non-fiduciary defendants and granting certain of the plaintiffs' motion for class certification. The class is defined as " All persons, other than Defendants and members of their immediate families, who were participants in or beneficiaries of the SunTrust Banks, Inc. 401(k) Savings Plan (the "Plan") at any time between May 15, 2007 and March 30, 2011, inclusive (the "Class Period") and whose accounts included investments in SunTrust common stock ("SunTrust Stock") during that time period and who sustained a loss to their account as a result of the investment in SunTrust Stock. " Discovery has closed in the matter. On February 22, 2018, the Company informed the District Court that it had reached an agreement in principle with class counsel to settle this class action, subject to court approval. Mutual Funds Class Actions On March 11, 2011, the Company and certain officers, directors, and employees of the Company were named in a putative class action alleging that they breached their fiduciary duties under ERISA by offering certain STI Classic Mutual Funds as investment options in the Plan. The plaintiffs purport to represent all current and former Plan participants who held the STI Classic Mutual Funds in their Plan accounts from April 2002 through December 2010 and seek to recover alleged losses these Plan participants supposedly incurred as a result of their investment in the STI Classic Mutual Funds. This action is pending in the U.S. District Court for the Northern District of Georgia, Atlanta Division (the “District Court”). Subsequently, plaintiffs' counsel initiated a substantially similar lawsuit against the Company naming two new plaintiffs. On June 27, 2014, Brown, et al. v. SunTrust Banks, Inc., et al., another putative class action alleging breach of fiduciary duties associated with the inclusion of STI Classic Mutual Funds as investment options in the Plan, was filed in the U.S. District Court for the District of Columbia but then was transferred to the District Court. After various appeals, the cases were remanded to the District Court. On March 25, 2016, a consolidated amended complaint was filed, consolidating all of these pending actions into one case . The Company filed an answer to the consolidated amended complaint on June 6, 2016. Subsequent to the closing of fact discovery, plaintiffs filed their second amended consolidated complaint on December 19, 2017 which among other things named five new defendants. On January 2, 2018, defendants filed their answer to the second amended consolidated complaint. Intellectual Ventures II v. SunTrust Banks, Inc. and SunTrust Bank This action was filed in the U.S. District Court for the Northern District of Georgia on July 24, 2013. Plaintiff alleged that SunTrust violates five patents held by plaintiff in connection with SunTrust’s provision of online banking services and other systems and services. Plaintiff seeks damages for alleged patent infringement of an unspecified amount, as well as attorney’s fees and expenses. The matter was stayed on October 7, 2014 pending inter partes reviews of a number of the claims asserted against SunTrust. After completion of those reviews, plaintiff dismissed its claims regarding four of the five patents on August 1, 2017. Consent Order with the Federal Reserve On April 13, 2011, SunTrust, SunTrust Bank, and STM entered into a Consent Order with the FRB in which SunTrust, SunTrust Bank, and STM agreed to strengthen oversight of, and improve risk management, internal audit, and compliance programs concerning the residential mortgage loan servicing, loss mitigation, and foreclosure activities of STM . On January 12, 2018, the FRB terminated the Consent Order without penalty, finding that the Company has demonstrated sustained improvements in oversight and mortgage loan servicing and foreclosure practice. United States Mortgage Servicing Settlement In the second quarter of 2014, STM and the U.S., through the DOJ , HUD , and Attorneys General for several states, reached a final settlement agreement related to the National Mortgage Servicing Settlement. The settlement agreement became effective on September 30, 2014 when the court entered the Consent Judgment. Pursuant to the settlements, STM made $50 million in cash payments, provided $500 million of consumer relief, and implemented certain mortgage servicing standards. In an August 10, 2017 report, the independent Office of Mortgage Settlement Oversight ("OMSO"), appointed to review and certify compliance with the provisions of the settlement, confirmed that the Company fulfilled its consumer relief commitments of the settlement. STM 's compliance with certain mortgage servicing standards continues to be monitored, tested, and reported quarterly by an internal review group and semi-annually by the OMSO. The Company does not expect costs associated with remaining servicing standard obligations to have a material impact on the Company's financial results. United States Attorney’s Office for the Southern District of New York Foreclosure Expense Investigation In April 2013, STM began cooperating with the United States Attorney's Office for the Southern District of New York (the "Southern District") in a broad-based industry investigation regarding claims for foreclosure-related expenses charged by law firms in connection with the foreclosure of loans guaranteed or insured by Fannie Mae , Freddie Mac , or FHA . The investigation relates to a private litigant qui tam lawsuit filed under seal and remains in early stages. The Southern District has not yet advised STM how it will proceed in this matter. The Southern District and STM engaged in dialogue regarding potential resolution of this matter as part of the National Mortgage Servicing Settlement, but were unable to reach agreement. LR Trust v. SunTrust Banks, Inc., et al. In November 2016, the Company and certain officers and directors were named as defendants in a shareholder derivative action alleging that defendants failed to take action related to activities at issue in the National Mortgage Servicing, HAMP , and FHA Originations settlements, and certain other legal matters or to ensure that the alleged activities in each were remedied and otherwise appropriately addressed. Plaintiff sought an award in favor of the Company for the amount of damages sustained by the Company, disgorgement of alleged benefits obtained by defendants, and enhancements to corporate governance and internal controls. On September 18, 2017, the court dismissed this matter and on October 16, 2017, Plaintiff filed an appeal. Millennium Lender Claim Trust v. STRH and SunTrust Bank, et al. In August 2017, the Trustee of the Millennium Lender Claim Trust filed a suit in the New York State Court against STRH , SunTrust Bank, and other lenders of the $1.775 B Millennium Health LLC f/k/a Millennium Laboratories LLC (“Millennium”) syndicated loan. The Trustee alleges that the loan was actually a security and that defendants misrepresented or omitted to state material facts in the offering materials and communications provided concerning the legality of Millennium's sales, marketing, and billing practices and the known risks posed by a pending government investigation into the illegality of such practices. The Trustee brings claims for violation of the California Corporate Securities Law, the Massachusetts Uniform Securities Act, the Colorado Securities Act, and the Illinois Securities Law, as well as negligent misrepresentation and seeks rescission of sales of securities as well as unspecified rescissory damages, compensatory damages, punitive damages, interest, and attorneys' fees and costs. The defendants have removed the case to the U.S. District Court for the Southern District of New York.

Business Segment Reporting

Business Segment Reporting	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segment Reporting	NOTE 20 - BUSINESS SEGMENT REPORTING The Company operates and measures business activity across two segments: Consumer and Wholesale , with functional activities included in Corporate Other . In the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments based on, among other things, the manner in which financial information is evaluated by management and in conjunction with Company-wide organizational changes that were announced during the first quarter of 2017. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. The following is a description of the segments and their primary businesses at December 31, 2017 . The Consumer segment is made up of four primary businesses: • Consumer Banking provides services to individual consumers and branch-managed small business clients through an extensive network of traditional and in-store branches, ATM s, the internet ( www.suntrust.com ), mobile banking, and by telephone (1-800-SUNTRUST). Financial products and services offered to consumers and small business clients include deposits and payments, loans, and various fee-based services. Consumer Banking also serves as an entry point for clients and provides services for other businesses. • Consumer Lending offers an array of lending products to individual consumers and small business clients via the Company's Consumer Banking and PWM businesses, through the internet ( www.suntrust.com and www.lightstream.com ), as well as through various national offices and partnerships. Products offered include home equity lines, personal credit lines and loans, direct auto, indirect auto, student lending, credit cards, and other lending products. • PWM provides a full array of wealth management products and professional services to individual consumers and institutional clients, including loans, deposits, brokerage, professional investment advisory, and trust services to clients seeking active management of their financial resources. Institutional clients are served by the Institutional Investment Solutions business. Discount/online and full-service brokerage products are offered to individual clients through STIS . Investment advisory products and services are offered to clients by STAS , an SEC registered investment advisor. PWM also includes GFO , which provides family office solutions to ultra-high net worth individuals and their families. Utilizing teams of multi-disciplinary specialists with expertise in investments, tax, accounting, estate planning, and other wealth management disciplines, GFO helps clients manage and sustain wealth across multiple generations. • Mortgage Banking offers residential mortgage products nationally through its retail and correspondent channels, the internet ( www.suntrust.com ), and by telephone (1-800-SUNTRUST). These products are either sold in the secondary market, primarily with servicing rights retained, or held in the Company’s loan portfolio. Mortgage Banking also services loans for other investors, in addition to loans held in the Company’s loan portfolio. The Wholesale segment is made up of three primary businesses and the Treasury & Payment Solutions product group: • CIB delivers comprehensive capital markets solutions, including advisory, capital raising, and financial risk management, with the goal of serving the needs of both public and private companies in the Wholesale segment and PWM business. Investment Banking and Corporate Banking teams within CIB serve clients across the nation, offering a full suite of traditional banking and investment banking products and services to companies with annual revenues typically greater than $150 million. Investment Banking serves select industry segments including consumer and retail, energy, technology, financial services, healthcare, industrials, and media and communications. Corporate Banking serves clients across diversified industry sectors based on size, complexity, and frequency of capital markets issuance. Also managed within CIB is the Equipment Finance Group, which provides lease financing solutions (through SunTrust Equipment Finance & Leasing). • Commercial & Business Banking offers an array of traditional banking products, including lending, cash management and investment banking solutions via STRH to commercial clients (generally clients with revenues between $1 million and $250 million), not-for-profit organizations, and governmental entities, as well as auto dealer financing (floor plan inventory financing). ◦ On December 1, 2017 , the Company completed the sale of PAC , its commercial lines insurance premium finance subsidiary. For all periods presented, the financial results of PAC , including the gain on the sale, are reflected in the Wholesale segment. See Note 2 , "Acquisitions/Dispositions," for additional information related to the sale of PAC . • Commercial Real Estate provides a full range of financial solutions for commercial real estate developers, owners, and operators, including construction, mini-perm, and permanent real estate financing, as well as tailored financing and equity investment solutions via STRH . Commercial Real Estate also provides multi-family agency lending and servicing, as well as loan administration, advisory, and commercial mortgage brokerage services via Pillar . The Institutional Property Group business targets relationships with REIT s, pension fund advisors, private funds, homebuilders, and insurance companies and the Regional business focuses on private real estate owners and developers through a regional delivery structure. Commercial Real Estate also offers tailored financing and equity investment solutions for community development and affordable housing projects through STCC , with particular expertise in Low Income Housing Tax Credits and New Market Tax Credits. • Treasury & Payment Solutions provides Wholesale clients with services required to manage their payments and receipts, combined with the ability to manage and optimize their deposits across all aspects of their business. Treasury & Payment Solutions operates all electronic and paper payment types, including card, wire transfer, ACH , check, and cash. It also provides clients the means to manage their accounts electronically online, both domestically and internationally. Corporate Other includes management of the Company’s investment securities portfolio, long-term debt, end user derivative instruments, short-term liquidity and funding activities, balance sheet risk management, and most real estate assets. Additionally, Corporate Other includes the Company's functional activities such as marketing, SunTrust online, human resources, finance, ER , legal and compliance, communications, procurement, enterprise information services, corporate real estate, and executive management. Because business segment results are presented based on management accounting practices, the transition to the consolidated results prepared under U.S. GAAP creates certain differences, which are reflected in Reconciling Items. Business segment reporting conventions are described below: • Net interest income-FTE – is reconciled from Net interest income and is grossed-up on an FTE basis to make income from tax-exempt assets comparable to other taxable products. Segment results reflect matched maturity funds transfer pricing, which ascribes credits or charges based on the economic value or cost created by assets and liabilities of each segment. Differences between these credits and charges are captured as reconciling items. The change in this variance is generally attributable to corporate balance sheet management strategies. • Provision for credit losses – represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to each segment's quarterly change in the ALLL and Unfunded commitments reserve balances. • Noninterest income – includes federal and state tax credits that are grossed-up on a pre-tax equivalent basis, related primarily to certain community development investments. • Provision for income taxes-FTE – is calculated using a blended income tax rate for each segment and includes reversals of the tax adjustments and credits described above. The difference between the calculated Provision for income taxes at the segment level and the consolidated Provision for income taxes is reported as reconciling items. The segment’s financial performance is comprised of direct financial results and allocations for various corporate functions that provide management an enhanced view of the segment’s financial performance. Internal allocations include the following: • Operational costs – expenses are charged to segments based on a methodical activity-based costing process, which also allocates residual expenses to the segments. Generally, recoveries of these costs are reported in Corporate Other. • Support and overhead costs – expenses not directly attributable to a specific segment are allocated based on various drivers (number of equivalent employees, number of PCs/laptops, net revenue, etc.). Recoveries for these allocations are reported in Corporate Other. The application and development of management reporting methodologies is an active process and undergoes periodic enhancements. The implementation of these enhancements to the internal management reporting methodology may materially affect the results disclosed for each segment, with no impact on consolidated results. If significant changes to management reporting methodologies take place, the impact of these changes is quantified and prior period information is revised, when practicable. In the second quarter of 2017, in conjunction with the aforementioned business segment structure realignment, the Company made certain adjustments to its internal funds transfer pricing methodology. Prior period information was revised to conform to the new business segment structure and the updated internal funds transfer pricing methodology. Year Ended December 31, 2017 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $72,622 $71,521 $76 ($3 ) $144,216 Average consumer and commercial deposits 102,820 56,618 175 (64 ) 159,549 Average total assets 82,507 85,227 34,567 2,630 204,931 Average total liabilities 103,757 62,291 14,610 (28 ) 180,630 Average total equity — — — 24,301 24,301 Statements of Income: Net interest income $3,698 $2,247 ($44 ) ($268 ) $5,633 FTE adjustment — 142 3 — 145 Net interest income-FTE 1 3,698 2,389 (41 ) (268 ) 5,778 Provision for credit losses 2 368 41 — — 409 Net interest income after provision for credit losses-FTE 3,330 2,348 (41 ) (268 ) 5,369 Total noninterest income 1,874 1,710 (33 ) (197 ) 3,354 Total noninterest expense 3,842 1,869 73 (20 ) 5,764 Income before provision for income taxes-FTE 1,362 2,189 (147 ) (445 ) 2,959 Provision for income taxes-FTE 3, 4 491 816 (355 ) (275 ) 677 Net income including income attributable to noncontrolling interest 871 1,373 208 (170 ) 2,282 Less: Net income attributable to noncontrolling interest — — 9 — 9 Net income $871 $1,373 $199 ($170 ) $2,273 1 Presented on a matched maturity funds transfer price basis for the segments. 2 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 3 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals. 4 Tax effects resulting from the 2017 Tax Act are included in Corporate Other. Year Ended December 31, 2016 1 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $69,455 $71,600 $66 ($3 ) $141,118 Average consumer and commercial deposits 99,424 54,713 124 (72 ) 154,189 Average total assets 79,118 85,494 31,952 2,440 199,004 Average total liabilities 100,423 60,438 14,148 (73 ) 174,936 Average total equity — — — 24,068 24,068 Statements of Income: Net interest income $3,465 $2,018 $101 ($363 ) $5,221 FTE adjustment — 136 2 — 138 Net interest income-FTE 2 3,465 2,154 103 (363 ) 5,359 Provision for credit losses 3 172 272 — — 444 Net interest income after provision for credit losses-FTE 3,293 1,882 103 (363 ) 4,915 Total noninterest income 2,036 1,356 138 (147 ) 3,383 Total noninterest expense 3,796 1,676 13 (17 ) 5,468 Income before provision for income taxes-FTE 1,533 1,562 228 (493 ) 2,830 Provision for income taxes-FTE 4 568 583 59 (267 ) 943 Net income including income attributable to noncontrolling interest 965 979 169 (226 ) 1,887 Less: Net income attributable to noncontrolling interest — — 9 — 9 Net income $965 $979 $160 ($226 ) $1,878 1 Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation. 2 Presented on a matched maturity funds transfer price basis for the segments. 3 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 4 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals. Year Ended December 31, 2015 1 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $65,637 $67,872 $60 ($11 ) $133,558 Average consumer and commercial deposits 93,789 50,373 101 (60 ) 144,203 Average total assets 75,204 80,903 29,668 3,117 188,892 Average total liabilities 94,801 56,044 14,771 (70 ) 165,546 Average total equity — — — 23,346 23,346 Statements of Income: Net interest income $3,324 $1,918 $152 ($630 ) $4,764 FTE adjustment 1 138 3 — 142 Net interest income-FTE 2 3,325 2,056 155 (630 ) 4,906 Provision for credit losses 3 27 137 — 1 165 Net interest income after provision for credit losses-FTE 3,298 1,919 155 (631 ) 4,741 Total noninterest income 1,967 1,285 137 (121 ) 3,268 Total noninterest expense 3,631 1,523 17 (11 ) 5,160 Income before provision for income taxes-FTE 1,634 1,681 275 (741 ) 2,849 Provision for income taxes-FTE 4 553 628 81 (356 ) 906 Net income including income attributable to noncontrolling interest 1,081 1,053 194 (385 ) 1,943 Less: Net income attributable to noncontrolling interest — — 10 — 10 Net income $1,081 $1,053 $184 ($385 ) $1,933 1 Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation. 2 Presented on a matched maturity funds transfer price basis for the segments. 3 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 4 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income	NOTE 21 - ACCUMULATED OTHER COMPREHENSIVE LOSS Changes in the components of AOCI, net of tax, are presented in the following table: (Dollars in millions) Securities AFS Derivative Instruments Brokered Time Deposits Long-Term Debt Employee Benefit Plans Total Year Ended December 31, 2017 Balance, beginning of period ($62 ) ($157 ) ($1 ) ($7 ) ($594 ) ($821 ) Net unrealized (losses)/gains arising during the period (7 ) (31 ) — 3 11 (24 ) Amounts reclassified to net income 68 (56 ) — — 13 25 Other comprehensive income/(loss), net of tax 61 (87 ) — 3 24 1 Balance, end of period ($1 ) ($244 ) ($1 ) ($4 ) ($570 ) ($820 ) Year Ended December 31, 2016 Balance, beginning of period $135 $87 $— $— ($682 ) ($460 ) Cumulative credit risk adjustment 1 — — — (5 ) — (5 ) Net unrealized (losses)/gains arising during the period (194 ) (91 ) (1 ) (2 ) 76 (212 ) Amounts reclassified to net income (3 ) (153 ) — — 12 (144 ) Other comprehensive (loss)/income, net of tax (197 ) (244 ) (1 ) (2 ) 88 (356 ) Balance, end of period ($62 ) ($157 ) ($1 ) ($7 ) ($594 ) ($821 ) Year Ended December 31, 2015 Balance, beginning of period $298 $97 $— $— ($517 ) ($122 ) Net unrealized (losses)/gains arising during the period (150 ) 154 — — (174 ) (170 ) Amounts reclassified to net income (13 ) (164 ) — — 9 (168 ) Other comprehensive loss, net of tax (163 ) (10 ) — — (165 ) (338 ) Balance, end of period $135 $87 $— $— ($682 ) ($460 ) 1 Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1 , "Significant Accounting Policies," for additional information. Reclassifications from AOCI to Net income, and the related tax effects, are presented in the following table: (Dollars in millions) Year Ended December 31 Impacted Line Item in the Consolidated Statements of Income Details About AOCI Components 2017 2016 2015 Securities AFS: Realized losses/(gains) on securities AFS $108 ($4 ) ($21 ) Net securities (losses)/gains Tax effect (40 ) 1 8 Provision for income taxes 68 (3 ) (13 ) Derivative Instruments: Realized gains on cash flow hedges (89 ) (244 ) (261 ) Interest and fees on loans held for investment Tax effect 33 91 97 Provision for income taxes (56 ) (153 ) (164 ) Employee Benefit Plans: Amortization of prior service credit (6 ) (6 ) (6 ) Employee benefits Amortization of actuarial loss 25 25 21 Employee benefits 19 19 15 Tax effect (6 ) (7 ) (6 ) Provision for income taxes 13 12 9 Total reclassifications from AOCI to net income $25 ($144 ) ($168 )

SunTrust Banks, Inc. (Parent Co

SunTrust Banks, Inc. (Parent Company Only) Financial Information	12 Months Ended
	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	NOTE 22 - PARENT COMPANY FINANCIAL INFORMATION Statements of Income - Parent Company Only Year Ended December 31 (Dollars in millions) 2017 2016 2015 Income Dividends 1 $1,414 $1,300 $1,159 Interest from loans to subsidiaries 25 15 8 Interest from deposits at banks 22 12 5 Other income 5 2 9 Total income 1,466 1,329 1,181 Expense Interest on short-term borrowings 4 2 1 Interest on long-term debt 137 140 128 Employee compensation and benefits 2 103 57 69 Service fees to subsidiaries 12 12 6 Other expense 33 24 21 Total expense 289 235 225 Income before income tax benefit and equity in undistributed income of subsidiaries 1,177 1,094 956 Income tax benefit 72 59 61 Income before equity in undistributed income of subsidiaries 1,249 1,153 1,017 Equity in undistributed income of subsidiaries 1,024 725 916 Net income $2,273 $1,878 $1,933 Total other comprehensive income/(loss), net of tax 1 (356 ) (338 ) Total comprehensive income $2,274 $1,522 $1,595 1 Substantially all dividend income is from subsidiaries (primarily the Bank). 2 Includes incentive compensation allocations between the Parent Company and subsidiaries. Balance Sheets - Parent Company Only December 31 (Dollars in millions) 2017 2016 Assets Cash held at SunTrust Bank $701 $535 Interest-bearing deposits held at SunTrust Bank 2,144 1,126 Interest-bearing deposits held at other banks 24 23 Cash and cash equivalents 2,869 1,684 Securities available for sale 123 147 Loans to subsidiaries 1,218 2,516 Investment in capital stock of subsidiaries stated on the basis of the Company’s equity in subsidiaries’ capital accounts: Banking subsidiaries 24,590 23,617 Nonbanking subsidiaries 1,423 1,359 Goodwill 211 211 Other assets 547 528 Total assets $30,981 $30,062 Liabilities Short-term borrowings: Subsidiaries $205 $283 Non-affiliated companies 350 483 Long-term debt: Non-affiliated companies 4,466 4,950 Other liabilities 909 831 Total liabilities 5,930 6,547 Shareholders’ Equity Preferred stock 2,475 1,225 Common stock 550 550 Additional paid-in capital 9,000 9,010 Retained earnings 17,540 16,000 Treasury stock, at cost, and other (3,694 ) (2,449 ) Accumulated other comprehensive loss, net of tax (820 ) (821 ) Total shareholders’ equity 25,051 23,515 Total liabilities and shareholders’ equity $30,981 $30,062 Statements of Cash Flows - Parent Company Only Year Ended December 31 (Dollars in millions) 2017 2016 2015 Cash Flows from Operating Activities: Net income $2,273 $1,878 $1,933 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiaries (1,024 ) (725 ) (916 ) Depreciation, amortization, and accretion 5 3 6 Deferred income tax expense/(benefit) 5 11 (4 ) Stock-based compensation — 3 11 Net securities (gains)/losses (1 ) — — Net increase in other assets (15 ) (129 ) (72 ) Net increase/(decrease) in other liabilities 122 62 (28 ) Net cash provided by operating activities 1,365 1,103 930 Cash Flows from Investing Activities: Proceeds from maturities, calls, and paydowns of securities available for sale 38 49 66 Proceeds from sales of securities available for sale 1 4 — Purchases of securities available for sale (17 ) (4 ) (15 ) Net decrease/(increase) in loans to subsidiaries 1,298 (889 ) 1,042 Other, net — (3 ) (2 ) Net cash provided by/(used in) investing activities 1,320 (843 ) 1,091 Cash Flows from Financing Activities: Net (decrease)/increase in short-term borrowings (211 ) 5 (763 ) Proceeds from long-term debt 9 2,005 — Repayment of long-term debt (482 ) (1,784 ) (29 ) Proceeds from the issuance of preferred stock 1,239 — — Repurchase of common stock (1,314 ) (806 ) (679 ) Repurchase of common stock warrants — (24 ) — Common and preferred dividends paid (723 ) (564 ) (539 ) Taxes paid related to net share settlement of equity awards (39 ) (48 ) (36 ) Proceeds from the exercise of stock options 21 25 17 Net cash used in financing activities (1,500 ) (1,191 ) (2,029 ) Net increase/(decrease) in cash and cash equivalents 1,185 (931 ) (8 ) Cash and cash equivalents at beginning of period 1,684 2,615 2,623 Cash and cash equivalents at end of period $2,869 $1,684 $2,615 Supplemental Disclosures: Income taxes paid to subsidiaries ($489 ) ($886 ) ($499 ) Income taxes received by Parent Company 414 812 481 Net income taxes paid by Parent Company ($75 ) ($74 ) ($18 ) Interest paid $140 $135 $130

Significant Accounting Polici32

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Recently Issued Accounting Pronouncements The following table summarizes ASU s issued by the FASB that were not yet adopted (or only partially adopted previously) as of December 31, 2017 , that could have a material effect on the Company's financial statements: Standard Description Required Date of Adoption Effect on the Financial Statements or Other Significant Matters Standard(s) Not Yet Adopted (or partially adopted previously) ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities The ASU amends ASC Topic 825, Financial Instruments-Overall , and addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions require most investments in equity securities to be measured at fair value through net income, unless they qualify for a measurement alternative, and require fair value changes arising from changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option to be recognized in other comprehensive income. With the exception of disclosure requirements and the application of the measurement alternative for certain equity investments that will be adopted prospectively, the ASU must be adopted on a modified retrospective basis. January 1, 2018 Early adoption is permitted beginning January 1, 2016 or 2017 for the provision related to changes in instrument-specific credit risk for financial liabilities under the FVO. The Company early adopted the provision related to changes in instrument-specific credit risk beginning January 1, 2016, which resulted in an immaterial cumulative effect adjustment from Retained earnings to AOCI. See Note 1, “Significant Accounting Policies,” to the Company's 2016 Annual Report on Form 10-K for additional information regarding the early adoption of this provision. Effective as of January 1, 2018, an immaterial amount of equity securities previously classified as Securities AFS were reclassified to Other assets, as the AFS classification is no longer permitted for equity securities under this ASU. The remaining provisions of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures upon adoption. However, for any investments for which we elect the measurement alternative, to the extent there is an observable price change in transactions occurring subsequent to January 1, 2018 for identical or similar instruments of the same issuer, these investments will have to be re-measured through net income based on the observed transaction price, which may result in a material impact to the Company's Consolidated Statements of Income. Standard Description Required Date of Adoption Effect on the Financial Statements or Other Significant Matters Standard(s) Not Yet Adopted (or partially adopted previously) (continued) ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments The ASU amends ASC Topic 230, Statement of Cash Flows , to clarify the classification of certain cash receipts and payments within the Company's Consolidated Statements of Cash Flow. These items include: cash payments for debt prepayment or debt extinguishment costs; cash outflows for the settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests acquired in securitization transactions. The ASU also clarifies that when no specific U.S. GAAP guidance exists and the source of the cash flows are not separately identifiable, the predominant source of cash flow should be used to determine the classification for the item. The ASU must be adopted on a retrospective basis. January 1, 2018 Effective as of January 1, 2018, the adoption date, the Company will change the presentation of certain cash payments and receipts within its Consolidated Statements of Cash Flows. Specifically, the Company will reclassify approximately $3 million and $17 million of proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, from operating activities to investing activities for the years ended December 31, 2017 and 2016, respectively. The Company will also reclassify approximately $127 million and $202 million of cash payments related to premiums paid for corporate-owned life insurance policies, including bank-owned life insurance policies, from operating activities to investing activities for the years ended December 31, 2017 and 2016, respectively. Lastly, for contingent consideration payments made more than three months after a business combination, the Company will reclassify the portion of the cash payment up to the acquisition date fair value of the contingent consideration as a financing activity and any amount paid in excess of the acquisition date fair value as an operating activity. For the year ended December 31, 2016, the Company will reclassify approximately $13 million from investing activities to financing activities and will reclassify approximately $10 million from investing activities to operating activities. For the year ended December 31, 2017, there were no contingent consideration payments made. These changes will be reflected for all periods presented in the Company's Consolidated Statements of Cash Flows beginning with its first quarter of 2018 Quarterly Report on Form 10-Q. ASU 2014-09, Revenue from Contracts with Customers ASU 2015-14, Deferral of the Effective Date ASU 2016-08, Principal versus Agent Considerations ASU 2016-10, Identifying Performance Obligations and Licensing ASU 2016-12, Narrow-Scope Improvements and Practical Expedients ASU 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers These ASUs comprise ASC Topic 606, Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition , and most industry-specific guidance throughout the Industry Topics of the ASC. The core principle of these ASUs is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. These ASUs may be adopted either retrospectively or on a modified retrospective basis to new contracts and existing contracts, with remaining performance obligations as of the effective date. January 1, 2018 The Company completed its evaluation of the anticipated effects that these ASUs will have on its Consolidated Financial Statements and related disclosures. The Company conducted a comprehensive scoping exercise to determine the revenue streams that are in the scope of these updates. Results indicate that certain noninterest income financial statement line items, including service charges on deposit accounts, card fees, other charges and fees, investment banking income, trust and investment management income, retail investment services, and other noninterest income, contain revenue streams that are within the scope of these updates. The Company adopted these ASUs on January 1, 2018 using the modified retrospective method of adoption. The adoption resulted in an immaterial cumulative effect adjustment to the opening balance of retained earnings. Additionally, there will be prospective changes to the presentation of certain types of revenue and expenses, such as underwriting revenue and expenses within investment banking income, which will be shown on a gross basis, and to certain types of cash promotions and card network expenses, which will be reclassified from noninterest expense to service charges on deposit accounts and card fees, respectively. The net quantitative impact of these presentation changes to noninterest income and noninterest expense is immaterial and will not affect net income. The Company is in the process of completing the required quantitative and qualitative disclosures, which will be included in its first quarter of 2018 Quarterly Report on Form 10-Q. Standard Description Required Date of Adoption Effect on the Financial Statements or Other Significant Matters Standard(s) Not Yet Adopted (or partially adopted previously) (continued) ASU 2017-09, Stock Compensation (Topic 718): Scope of Modification Accounting This ASU amends ASC Topic 718, Stock Compensation , to provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting per ASC Topic 718, Stock Compensation . The amendments clarify that modification accounting only applies to an entity if the fair value, vesting conditions, or classification of the award changes as a result of changes in the terms or conditions of a share-based payment award. The ASU should be applied prospectively to awards modified on or after the adoption date. January 1, 2018 The Company adopted this ASU on January 1, 2018 and upon adoption, the ASU did not impact the Company's Consolidated Financial Statements and related disclosures. ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities The ASU amends ASC Topic 815, Derivatives and Hedging, to simplify the requirements for hedge accounting. Key amendments include: eliminating the requirement to separately measure and report hedge ineffectiveness, requiring changes in the value of the hedging instrument to be presented in the same income statement line as the earnings effect of the hedged item, and the ability to measure the hedged item based on the benchmark interest rate component of the total contractual coupon for fair value hedges. These changes expand the types of risk management strategies eligible for hedge accounting. The ASU also permits entities to qualitatively assert that a hedging relationship was and continues to be highly effective. New incremental disclosures are also required for reporting periods subsequent to the date of adoption. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption using a modified retrospective approach. January 1, 2019 Early adoption is permitted. The Company early adopted this ASU beginning January 1, 2018 and modified its measurement methodology for certain hedged items designated under fair value hedge relationships. The Company elected to perform its subsequent assessments of hedge effectiveness using a qualitative, rather than a quantitative, approach. The adoption resulted in an immaterial cumulative effect adjustment to the opening balance of Retained earnings and a basis adjustment to the related hedged items. The Company is in the process of developing the required disclosures, which will be included in its first quarter 2018 Quarterly Report on Form 10-Q. ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from AOCI This ASU amends ASC Topic 220, Income Statement - Reporting Comprehensive Income to allow for a reclassification from AOCI to Retained earnings for the stranded tax effects resulting from the 2017 Tax Act. The amount of the reclassification would be the difference between the historical federal corporate income tax rate and the newly enacted 21 percent federal corporate income tax rate. Consequently, the amendments in this ASU would eliminate the stranded tax effects resulting from the change in the federal corporate income tax rate in the 2017 Tax Act. The Company may apply this ASU at the beginning of the period of adoption or retrospectively to all periods in which the 2017 Tax Act is enacted. January 1, 2019 The Company plans on early adopting this ASU as of January 1, 2018. Upon adoption of this ASU, the Company will elect to reclassify approximately $154 million of stranded tax effects relating to securities AFS, derivative instruments, credit risk on long-term debt, and employee benefit plans from AOCI to Retained earnings. ASU 2016-02, Leases The ASU creates ASC Topic 842, Leases , which supersedes ASC Topic 840, Leases . ASC Topic 842 requires lessees to recognize right-of-use assets and associated liabilities that arise from leases, with the exception of short-term leases. The ASU does not make significant changes to lessor accounting; however, there were certain improvements made to align lessor accounting with the lessee accounting model and ASC Topic 606, Revenue from Contracts with Customers . There are several new qualitative and quantitative disclosures required. Upon transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. January 1, 2019 Early adoption is permitted. The Company has formed a cross-functional team to oversee the implementation of this ASU. The Company's implementation efforts are ongoing, including the review of its lease portfolios and related lease accounting policies, the review of its service contracts for embedded leases, and the deployment of a new lease software solution. The Company's adoption of this ASU will result in an increase in right-of-use assets and associated lease liabilities, arising from operating leases in which the Company is the lessee, on its Consolidated Balance Sheets. The amount of the right-of-use assets and associated lease liabilities recorded upon adoption will be based primarily on the present value of unpaid future minimum lease payments, the amount of which will depend on the population of leases in effect at the date of adoption. At December 31, 2017, the Company’s estimate of right-of-use assets and lease liabilities that would be recorded on its Consolidated Balance Sheets upon adoption is in excess of $1 billion. The Company does not expect this ASU to have a material impact on its Consolidated Statements of Income subsequent to adoption. Standard Description Required Date of Adoption Effect on the Financial Statements or Other Significant Matters Standard(s) Not Yet Adopted (or partially adopted previously) (continued) ASU 2016-13, Measurement of Credit Losses on Financial Instruments The ASU adds ASC Topic 326, Financial Instruments-Credit Losses , to replace the incurred loss impairment methodology with a current expected credit loss methodology for financial instruments measured at amortized cost and other commitments to extend credit. For this purpose, expected credit losses reflect losses over the remaining contractual life of an asset, considering the effect of voluntary prepayments and considering available information about the collectability of cash flows, including information about past events, current conditions, and reasonable and supportable forecasts. The resulting allowance for credit losses is deducted from the amortized cost basis of the financial assets to reflect the net amount expected to be collected on the financial assets. Additional quantitative and qualitative disclosures are required upon adoption. The change to the allowance for credit losses at the time of the adoption will be made with a cumulative effect adjustment to Retained earnings. The current expected credit loss model does not apply to AFS debt securities; however, the ASU requires entities to record an allowance when recognizing credit losses for AFS securities, rather than recording a direct write-down of the carrying amount. January 1, 2020 Early adoption is permitted beginning January 1, 2019. The Company has formed a cross-functional team to oversee the implementation of this ASU and has identified the changes necessary to its credit loss estimation methodologies in order to comply with the new accounting standard requirements. Substantial progress has been made to date on implementing these changes, including the development of models, updates to technology systems, and the documentation of accounting policy decisions. Additionally, the Company is evaluating the impact that this ASU will have on its Consolidated Financial Statements and related disclosures, and the Company currently anticipates that an increase to the allowance for credit losses will be recognized upon adoption to provide for the expected credit losses over the estimated life of the financial assets. However, since the magnitude of the anticipated increase in the allowance for credit losses will be impacted by economic conditions and trends in the Company’s portfolio at the time of adoption, the quantitative impact cannot yet be reasonably estimated. ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The ASU amends ASC Topic 350, Intangibles - Goodwill and Other , to simplify the subsequent measurement of goodwill, by eliminating Step 2 from the goodwill impairment test. The amendments require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. Entities should recognize an impairment charge for the amount by which a reporting unit's carrying amount exceeds its fair value, but the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The ASU must be applied on a prospective basis. January 1, 2020 Early adoption is permitted. Based on the Company's most recent annual goodwill impairment test performed as of October 1, 2017, there were no reporting units for which the carrying amount of the reporting unit exceeded its fair value; therefore, this ASU would not currently have an impact on the Company's Consolidated Financial Statements and related disclosures. However, if upon adoption the carrying amount of a reporting unit exceeds its fair value, the Company would be required to recognize an impairment charge for the amount that the carrying value exceeds the fair value.

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefits - Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	The Company sponsors various compensation and benefit programs to attract and retain talent. Aligned with a pay for performance culture, the Company's plans and programs include short-term incentives, AIP , and various LTI plans. All incentive awards are subject to clawback provisions. Compensation expense for AIP and LTI plans with cash payouts was $319 million , $291 million , and $245 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Compensation expense for short-term incentive plans with cash payouts was $476 million , $469 million , and $448 million for the years ended December 31, 2017, 2016, and 2015 , respectively. Stock-Based Compensation The Company provides stock-based awards through the 2009 Stock Plan and various other deferred compensation plans under which the Compensation Committee of the Board of Directors has the authority to grant stock options, stock appreciation rights, restricted stock, phantom stock units, and RSU s to key employees of the Company. Award vesting may be conditional based upon individual, business unit, Company, and/or performance relative to peer group metrics. Effective January 1, 2014, following approval by the Compensation Committee of the Board, shareholders approved an amendment to the 2009 Stock Plan to remove the sub-limit on shares available for grant that may be issued as restricted stock or RSU s. Accordingly, all 17 million remaining authorized shares previously under the Stock Plan became available for grant as stock options, stock appreciation rights, restricted stock, or RSU s. Prior to the amendment, only a portion of such shares were available to be granted as either restricted stock or RSU s. At December 31, 2017 , approximately 16 million shares were available for grant. All stock option grants are exercisable for 10 years after the grant date. Shares or units of restricted stock may be granted to employees and directors. Generally, grants to employees either cliff vest after three years or vest pro-rata annually over three years. Restricted stock and RSU grants may be subject to one or more criteria, including employment, performance, or other conditions as established by the Compensation Committee at the time of grant. Any shares of restricted stock that are forfeited will again become available for issuance under the Stock Plan. An employee or director has the right to vote the shares of restricted stock after grant until they are forfeited. Compensation cost for restricted stock and RSU s is generally equal to the fair market value of the shares on the grant date of the award and is amortized over the vesting period. Dividends are paid on awarded, unvested restricted stock. The Company accrues and reinvests dividends in equivalent shares of SunTrust common stock for unvested RSU awards, which are paid out when the underlying RSU award vests. RSU awards are generally classified as equity. Consistent with the Company's 2014 decision to discontinue the issuance of stock options, no stock options were granted during the years ended December 31, 2017, 2016, and 2015 .

Acquisitions_Dispositions Sched

Acquisitions/Dispositions Schedule of Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Acquisitions and Dispositions [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	During the years ended December 31, 2017, 2016, and 2015 , the Company had the following notable acquisition and disposition: (Dollars in millions) Date Consideration Received/(Paid) Goodwill Other Intangible Assets Pre-tax Gain 2017 Sale of PAC 12/1/2017 $261 ($7 ) $— $107 2016 Acquisition of Pillar 12/15/2016 ($197 ) $1 $13 1 $— 1 Does not include $62 million of commercial mortgage servicing rights acquired.
Subsidiary Income Statement [Table Text Block]	The Company's results for the years ended December 31, 2017, 2016, and 2015 included the following related to PAC , excluding the gain on sale: (Dollars in millions) PAC Financial Information: 2017 2016 2015 Revenue $56 $60 $59 Less: Expenses 31 27 22 Income before provision for income taxes $25 $33 $37

Federal Funds Sold and Securi35

Federal Funds Sold and Securities Financing Activities (Tables)	12 Months Ended
	Dec. 31, 2017
Securities Purchased under Agreements to Resell [Abstract]
Schedule of Resale Agreements [Table Text Block]	Fed Funds sold and securities borrowed or purchased under agreements to resell were as follows: (Dollars in millions) December 31, 2017 December 31, 2016 Fed funds sold $65 $58 Securities borrowed 298 270 Securities purchased under agreements to resell 1,175 979 Total Fed funds sold and securities borrowed or purchased under agreements to resell $1,538 $1,307
Securities sold under agreements to repurchase remaining contractual maturity [Table Text Block]	Securities sold under agreements to repurchase are accounted for as secured borrowings. The following table presents the Company’s related activity, by collateral type and remaining contractual maturity: December 31, 2017 December 31, 2016 (Dollars in millions) Overnight and Continuous Up to 30 days 30-90 days Total Overnight and Continuous Up to 30 days 30-90 days Total U.S. Treasury securities $95 $— $— $95 $27 $— $— $27 Federal agency securities 101 15 — 116 288 24 — 312 MBS - agency 694 135 — 829 793 51 — 844 CP 19 — — 19 49 — — 49 Corporate and other debt securities 316 88 40 444 311 50 40 401 Total securities sold under agreements to repurchase $1,225 $238 $40 $1,503 $1,468 $125 $40 $1,633
Netting of Financial Instruments - Repurchase Agreements [Table Text Block]	The following table includes the amount of collateral pledged or received related to exposures subject to enforceable MRA s. While these agreements are typically over-collateralized, the amount of collateral presented in this table is limited to the amount of the related recognized asset or liability for each counterparty. (Dollars in millions) Gross Amount Amount Offset Net Amount Presented in Consolidated Balance Sheets Held/Pledged Financial Instruments Net Amount December 31, 2017 Financial assets: Securities borrowed or purchased under agreements to resell $1,473 $— $1,473 1 $1,462 $11 Financial liabilities: Securities sold under agreements to repurchase 1,503 — 1,503 1,503 — December 31, 2016 Financial assets: Securities borrowed or purchased under agreements to resell $1,249 $— $1,249 1 $1,241 $8 Financial liabilities: Securities sold under agreements to repurchase 1,633 — 1,633 1,633 — 1 Excludes $65 million and $58 million of Fed Funds sold, which are not subject to a master netting agreement at December 31, 2017 and 2016 , respectively

Trading Assets and Liabilitie36

Trading Assets and Liabilities and Derivatives Trading Assets and Liabilities and Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Trading Securities [Table Text Block]	The fair values of the components of trading assets and liabilities and derivative instruments are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Trading Assets and Derivative Instruments: U.S. Treasury securities $157 $539 Federal agency securities 395 480 U.S. states and political subdivisions 61 134 MBS - agency 700 567 CLO securities — 1 Corporate and other debt securities 655 656 CP 118 140 Equity securities 56 49 Derivative instruments 1 802 984 Trading loans 2 2,149 2,517 Total trading assets and derivative instruments $5,093 $6,067 Trading Liabilities and Derivative Instruments: U.S. Treasury securities $577 $697 MBS - agency — 1 Corporate and other debt securities 289 255 Equity securities 9 — Derivative instruments 1 408 398 Total trading liabilities and derivative instruments $1,283 $1,351 1 Amounts include the impact of offsetting cash collateral received from and paid to the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. 2 Includes loans related to TRS .
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]	Pledged trading assets are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Pledged trading assets to secure repurchase agreements 1 $1,016 $968 Pledged trading assets to secure certain derivative agreements 72 471 Pledged trading assets to secure other arrangements 41 40 1 Repurchase agreements secured by collateral totaled $975 million and $928 million at December 31, 2017 and 2016 , respectively.

Securities Available for Sale (

Securities Available for Sale (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities Portfolio Composition	Securities Portfolio Composition December 31, 2017 (Dollars in millions) Amortized Unrealized Unrealized Fair U.S. Treasury securities $4,361 $2 $32 $4,331 Federal agency securities 257 3 1 259 U.S. states and political subdivisions 618 7 8 617 MBS - agency residential 22,616 222 134 22,704 MBS - agency commercial 2,121 3 38 2,086 MBS - non-agency residential 55 4 — 59 MBS - non-agency commercial 862 7 3 866 ABS 6 2 — 8 Corporate and other debt securities 17 — — 17 Other equity securities 1 472 — 3 469 Total securities AFS $31,385 $250 $219 $31,416 December 31, 2016 (Dollars in millions) Amortized Unrealized Unrealized Fair U.S. Treasury securities $5,486 $5 $86 $5,405 Federal agency securities 310 5 2 313 U.S. states and political subdivisions 279 5 5 279 MBS - agency residential 22,379 311 254 22,436 MBS - agency commercial 1,263 2 39 1,226 MBS - non-agency residential 71 3 — 74 MBS - non-agency commercial 257 — 5 252 ABS 8 2 — 10 Corporate and other debt securities 34 1 — 35 Other equity securities 1 642 1 1 642 Total securities AFS $30,729 $335 $392 $30,672 1 At December 31, 2017 , the fair value of other equity securities was comprised of the following: $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, $49 million of mutual fund investments, and $2 million of other. At December 31, 2016 , the fair value of other equity securities was comprised of the following: $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $102 million of mutual fund investments, and $6 million of other.
Investment Income [Table Text Block]	The following table presents interest and dividends on securities AFS: Year Ended December 31 (Dollars in millions) 2017 2016 2015 Taxable interest $743 $630 $552 Tax-exempt interest 13 6 6 Dividends 18 15 35 Total interest and dividends on securities AFS $774 $651 $593
Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life	The following table presents the amortized cost, fair value, and weighted average yield of investments in debt securities AFS at December 31, 2017 , by remaining contractual maturity, with the exception of MBS and ABS , which are based on estimated average life. Receipt of cash flows may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalties. Distribution of Remaining Maturities (Dollars in millions) Due in 1 Year or Less Due After 1 Year through 5 Years Due After 5 Years through 10 Years Due After 10 Years Total Amortized Cost: U.S. Treasury securities $— $2,322 $2,039 $— $4,361 Federal agency securities 121 46 4 86 257 U.S. states and political subdivisions 6 49 149 414 618 MBS - agency residential 2,686 7,937 11,781 212 22,616 MBS - agency commercial — 315 1,547 259 2,121 MBS - non-agency residential — 55 — — 55 MBS - non-agency commercial — 12 813 37 862 ABS — 6 — — 6 Corporate and other debt securities 7 10 — — 17 Total debt securities AFS $2,820 $10,752 $16,333 $1,008 $30,913 Fair Value: U.S. Treasury securities $— $2,305 $2,026 $— $4,331 Federal agency securities 123 47 4 85 259 U.S. states and political subdivisions 6 52 153 406 617 MBS - agency residential 2,748 7,980 11,763 213 22,704 MBS - agency commercial — 308 1,525 253 2,086 MBS - non-agency residential — 59 — — 59 MBS - non-agency commercial — 12 816 38 866 ABS — 8 — — 8 Corporate and other debt securities 7 10 — — 17 Total debt securities AFS $2,884 $10,781 $16,287 $995 $30,947 Weighted average yield 1 3.36 % 2.34 % 2.81 % 3.23 % 2.71 % 1 Weighted average yields are based on amortized cost and presented on an FTE basis.
Securities in a Continuous Unrealized Loss Position	Securities AFS in an unrealized loss position at period end are presented in the following tables: December 31, 2017 Less than twelve months Twelve months or longer Total (Dollars in millions) Fair Unrealized 2 Fair Unrealized 2 Fair Unrealized 2 Temporarily impaired securities AFS: U.S. Treasury securities $1,993 $12 $841 $20 $2,834 $32 Federal agency securities 23 — 60 1 83 1 U.S. states and political subdivisions 267 3 114 5 381 8 MBS - agency residential 8,095 38 4,708 96 12,803 134 MBS - agency commercial 887 9 915 29 1,802 38 MBS - non-agency commercial 134 1 93 2 227 3 ABS — — 4 — 4 — Corporate and other debt securities 10 — — — 10 — Other equity securities — — 2 3 2 3 Total temporarily impaired securities AFS 11,409 63 6,737 156 18,146 219 OTTI securities AFS 1 : ABS — — 1 — 1 — Total OTTI securities AFS — — 1 — 1 — Total impaired securities AFS $11,409 $63 $6,738 $156 $18,147 $219 1 OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings. 2 Unrealized losses less than $0.5 million are presented as zero within the table. December 31, 2016 Less than twelve months Twelve months or longer Total (Dollars in millions) Fair Value Unrealized Losses 2 Fair Value Unrealized 2 Fair Value Unrealized Losses 2 Temporarily impaired securities AFS: U.S. Treasury securities $4,380 $86 $— $— $4,380 $86 Federal agency securities 96 2 3 — 99 2 U.S. states and political subdivisions 149 5 — — 149 5 MBS - agency residential 13,505 247 436 7 13,941 254 MBS - agency commercial 1,117 38 15 1 1,132 39 MBS - non-agency commercial 184 5 — — 184 5 ABS — — 5 — 5 — Corporate and other debt securities 12 — — — 12 — Other equity securities — — 4 1 4 1 Total temporarily impaired securities AFS 19,443 383 463 9 19,906 392 OTTI securities AFS 1 : MBS - non-agency residential 16 — — — 16 — ABS — — 1 — 1 — Total OTTI securities AFS 16 — 1 — 17 — Total impaired securities AFS $19,459 $383 $464 $9 $19,923 $392 1 OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings. 2 Unrealized losses less than $0.5 million are presented as zero within the table.
Realized Gain (Loss) on Investments [Table Text Block]	Year Ended December 31 (Dollars in millions) 2017 2016 2015 Gross realized gains $3 $4 $25 Gross realized losses (110 ) — (3 ) OTTI credit losses recognized in earnings (1 ) — (1 ) Net securities (losses)/gains ($108 ) $4 $21
Measurement of Investment Credit Loss Assumptions [Table Text Block]	The following table presents a summary of the significant inputs used in determining the measurement of OTTI credit losses recognized in earnings for non-agency MBS for the years ended December 31 : 2017 1 2016 2 2015 1 Default rate 3% N/A 9% Prepayment rate 19% N/A 13% Loss severity 41% N/A 56% 1 OTTI credit losses recognized in earnings relate to one non-agency MBS with a fair value of $12 million and $20 million at December 31, 2017 and 2015, respectively. 2 "N/A" - Not applicable as there were no OTTI credit losses recognized in earnings for the year ended December 31, 2016 .

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Composition of Loan Portfolio	(Dollars in millions) December 31, 2017 December 31, 2016 Commercial loans: C&I 1 $66,356 $69,213 CRE 5,317 4,996 Commercial construction 3,804 4,015 Total commercial loans 75,477 78,224 Consumer loans: Residential mortgages - guaranteed 560 537 Residential mortgages - nonguaranteed 2 27,136 26,137 Residential home equity products 10,626 11,912 Residential construction 298 404 Guaranteed student 6,633 6,167 Other direct 8,729 7,771 Indirect 12,140 10,736 Credit cards 1,582 1,410 Total consumer loans 67,704 65,074 LHFI $143,181 $143,298 LHFS 3 $2,290 $4,169 1 Includes $3.7 billion of lease financing at both December 31, 2017 and 2016 , and $778 million and $729 million of installment loans at December 31, 2017 and 2016 , respectively. 2 Includes $196 million and $222 million of LHFI measured at fair value at December 31, 2017 and 2016 , respectively. 3 Includes $1.6 billion and $3.5 billion of LHFS measured at fair value at December 31, 2017 and 2016 , respectively.
LHFI by Credit Quality Indicator	LHFI by credit quality indicator are presented in the following tables: Commercial Loans C&I CRE Commercial Construction (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Risk rating: Pass $64,546 $66,961 $5,126 $4,574 $3,770 $3,914 Criticized accruing 1,595 1,862 167 415 33 84 Criticized nonaccruing 215 390 24 7 1 17 Total $66,356 $69,213 $5,317 $4,996 $3,804 $4,015 Consumer Loans 1 Residential Mortgages - Nonguaranteed Residential Home Equity Products Residential Construction (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Current FICO score range: 700 and above $23,602 $22,194 $8,946 $9,826 $240 $292 620 - 699 2,721 3,042 1,242 1,540 50 96 Below 620 2 813 901 438 546 8 16 Total $27,136 $26,137 $10,626 $11,912 $298 $404 Other Direct Indirect Credit Cards (Dollars in millions) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Current FICO score range: 700 and above $7,929 $7,008 $9,094 $7,642 $1,088 $974 620 - 699 757 703 2,344 2,381 395 351 Below 620 2 43 60 702 713 99 85 Total $8,729 $7,771 $12,140 $10,736 $1,582 $1,410 1 Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016 , respectively, for which there was nominal risk of principal loss due to the government guarantee. 2 For substantially all loans with refreshed FICO scores below 620, the borrower’s FICO score at the time of origination exceeded 620 but has since deteriorated as the loan has seasoned.
Payment Status for the LHFI Portfolio	The LHFI portfolio by payment status is presented in the following tables: December 31, 2017 (Dollars in millions) Accruing Current Accruing 30-89 Days Past Due Accruing 90+ Days Past Due Nonaccruing 2 Total Commercial loans: C&I $66,092 $42 $7 $215 $66,356 CRE 5,293 — — 24 5,317 Commercial construction 3,803 — — 1 3,804 Total commercial loans 75,188 42 7 240 75,477 Consumer loans: Residential mortgages - guaranteed 159 55 346 — 560 Residential mortgages - nonguaranteed 1 26,778 148 4 206 27,136 Residential home equity products 10,348 75 — 203 10,626 Residential construction 280 7 — 11 298 Guaranteed student 4,946 659 1,028 — 6,633 Other direct 8,679 36 7 7 8,729 Indirect 12,022 111 — 7 12,140 Credit cards 1,556 13 13 — 1,582 Total consumer loans 64,768 1,104 1,398 434 67,704 Total LHFI $139,956 $1,146 $1,405 $674 $143,181 1 Includes $196 million of loans measured at fair value, the majority of which were accruing current. 2 Nonaccruing loans past due 90 days or more totaled $357 million . Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans. December 31, 2016 (Dollars in millions) Accruing Current Accruing 30-89 Days Past Due Accruing 90+ Days Past Due Nonaccruing 2 Total Commercial loans: C&I $68,776 $35 $12 $390 $69,213 CRE 4,988 1 — 7 4,996 Commercial construction 3,998 — — 17 4,015 Total commercial loans 77,762 36 12 414 78,224 Consumer loans: Residential mortgages - guaranteed 155 55 327 — 537 Residential mortgages - nonguaranteed 1 25,869 84 7 177 26,137 Residential home equity products 11,596 81 — 235 11,912 Residential construction 389 3 — 12 404 Guaranteed student 4,637 603 927 — 6,167 Other direct 7,726 35 4 6 7,771 Indirect 10,608 126 1 1 10,736 Credit cards 1,388 12 10 — 1,410 Total consumer loans 62,368 999 1,276 431 65,074 Total LHFI $140,130 $1,035 $1,288 $845 $143,298 1 Includes $222 million of loans measured at fair value, the majority of which were accruing current. 2 Nonaccruing loans past due 90 days or more totaled $360 million . Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
LHFI Considered Impaired	December 31, 2017 December 31, 2016 (Dollars in millions) Unpaid Principal Balance Carrying Value 1 Related ALLL Unpaid Principal Balance Carrying Value 1 Related ALLL Impaired LHFI with no ALLL recorded: Commercial loans: C&I $38 $35 $— $266 $214 $— Total commercial loans with no ALLL recorded 38 35 — 266 214 — Consumer loans: Residential mortgages - nonguaranteed 458 363 — 466 360 — Residential construction 15 9 — 16 8 — Total consumer loans with no ALLL recorded 473 372 — 482 368 — Impaired LHFI with an ALLL recorded: Commercial loans: C&I 127 117 19 225 151 31 CRE 21 21 2 26 17 2 Total commercial loans with an ALLL recorded 148 138 21 251 168 33 Consumer loans: Residential mortgages - nonguaranteed 1,133 1,103 113 1,277 1,248 150 Residential home equity products 953 895 54 863 795 54 Residential construction 93 90 7 109 107 11 Other direct 59 59 1 59 2 59 2 1 Indirect 123 122 7 103 103 5 Credit cards 26 7 1 24 6 1 Total consumer loans with an ALLL recorded 2,387 2,276 183 2,435 2,318 222 Total impaired LHFI $3,046 $2,821 $204 $3,434 $3,068 $255 1 Carrying value reflects charge-offs that have been recognized plus other amounts that have been applied to adjust the net book balance. 2 Includes $41 million of TDRs that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016. Included in the impaired LHFI carrying values above at December 31, 2017 and 2016 were $2.4 billion and $2.5 billion of accruing TDRs, of which 96% and 97% were current, respectively. See Note 1 , “Significant Accounting Policies,” for further information regarding the Company’s loan impairment policy. Year Ended December 31 2017 2016 2015 (Dollars in millions) Average Carrying Value Interest Income Recognized 1 Average Carrying Value Interest Income Recognized 1 Average Carrying Value Interest Income Recognized 1 Impaired LHFI with no ALLL recorded: Commercial loans: C&I $34 $1 $169 $3 $58 $2 CRE — — — — 10 — Total commercial loans with no ALLL recorded 34 1 169 3 68 2 Consumer loans: Residential mortgages - nonguaranteed 357 15 370 16 390 17 Residential construction 8 — 8 — 11 — Total consumer loans with no ALLL recorded 365 15 378 16 401 17 Impaired LHFI with an ALLL recorded: Commercial loans: C&I 112 2 170 1 147 5 CRE 22 1 25 1 — — Total commercial loans with an ALLL recorded 134 3 195 2 147 5 Consumer loans: Residential mortgages - nonguaranteed 1,123 58 1,251 64 1,349 65 Residential home equity products 914 32 812 29 682 28 Residential construction 94 5 110 6 125 8 Other direct 60 4 10 1 12 — Indirect 136 6 114 6 125 6 Credit cards 6 1 6 1 7 1 Total consumer loans with an ALLL recorded 2,333 106 2,303 107 2,300 108 Total impaired LHFI $2,866 $125 $3,045 $128 $2,916 $132 1 Of the interest income recognized during the years ended December 31, 2017, 2016, and 2015 , cash basis interest income was $4 million , $4 million , and $7 million , respectively.
Nonperforming Assets	NPAs are presented in the following table: (Dollars in millions) December 31, 2017 December 31, 2016 Nonaccrual loans/NPLs: Commercial loans: C&I $215 $390 CRE 24 7 Commercial construction 1 17 Consumer loans: Residential mortgages - nonguaranteed 206 177 Residential home equity products 203 235 Residential construction 11 12 Other direct 7 6 Indirect 7 1 Total nonaccrual loans/NPLs 1 674 845 OREO 2 57 60 Other repossessed assets 10 14 Total NPAs $741 $919 1 Nonaccruing restructured loans are included in total nonaccrual loans /NPLs. 2 Does not include foreclosed real estate related to loans insured by the FHA or guaranteed by the VA . Proceeds due from the FHA and the VA are recorded as a receivable in Other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA and the VA totaled $45 million and $50 million at December 31, 2017 and 2016 , respectively.
TDR Modifications	TDRs that defaulted during the Year Ended December 31, 2017 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 178 $3 $43 $46 Consumer loans: Residential mortgages - nonguaranteed 150 22 10 32 Residential home equity products 2,488 45 176 221 Other direct 661 — 9 9 Indirect 2,740 — 61 61 Credit cards 919 4 — 4 Total TDR additions 7,136 $74 $299 $373 1 Includes loans modified under the terms of a TDR that were charged-off during the period. Year Ended December 31, 2016 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 84 $2 $68 $70 Commercial construction 1 — — — Consumer loans: Residential mortgages - nonguaranteed 397 79 12 91 Residential home equity products 2,611 9 227 236 Residential construction 1 — — — Other direct 2 3,925 — 50 50 Indirect 1,539 — 32 32 Credit cards 720 3 — 3 Total TDR additions 9,278 $93 $389 $482 1 Includes loans modified under the terms of a TDR that were charged-off during the period. 2 Includes 3,321 loans with a carrying value of $41 million that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016. Year Ended December 31, 2015 1 (Dollars in millions) Number of Loans Modified Rate Modification Term Extension and/or Other Concessions Total Commercial loans: C&I 57 $1 $3 $4 CRE 2 — — — Commercial construction 1 — — — Consumer loans: Residential mortgages - nonguaranteed 737 125 34 159 Residential home equity products 1,888 24 108 132 Residential construction 4 5 — 5 Other direct 54 — 1 1 Indirect 2,299 — 47 47 Credit cards 557 2 — 2 Total TDR additions 5,599 $157 $193 $350 1 Includes loans modified under the terms of a TDR that were charged-off during the period.
Concentration Risk Disclosure [Text Block]	The following table presents residential mortgage LHFI that included a high original LTV ratio (in excess of 80%), an interest only feature, and/or a second lien position that may increase the Company's exposure to credit risk and/or result in a concentration of credit risk. At December 31, 2017 and 2016 , the current weighted average FICO score for the borrowers of these residential mortgage LHFI was 756 and 751 , respectively. (Dollars in millions) December 31, 2017 December 31, 2016 Interest only mortgages with MI or with combined original LTV ≤ 80% 1 $569 $845 Interest only mortgages with no MI and with combined original LTV > 80% 1 77 279 Total interest only mortgages 1 646 1,124 Amortizing mortgages with combined original LTV > 80% and/or second liens 2 10,197 9,198 Total mortgages with potential concentration of credit risk $10,843 $10,322 1 Comprised of first and/or second liens, primarily with an initial 10 year interest only period. 2 Comprised of loans with no MI .

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Allowance for Credit Losses [Abstract]
Activity in the Allowance for Credit Losses	The allowance for credit losses consists of the ALLL and the unfunded commitments reserve. Activity in the allowance for credit losses is summarized in the following table: Year Ended December 31 (Dollars in millions) 2017 2016 2015 Balance, beginning of period $1,776 $1,815 $1,991 Provision for loan losses 397 440 156 Provision for unfunded commitments 12 4 9 Loan charge-offs (491 ) (591 ) (470 ) Loan recoveries 124 108 129 Other 1 (4 ) — — Balance, end of period $1,814 $1,776 $1,815 Components: ALLL $1,735 $1,709 $1,752 Unfunded commitments reserve 2 79 67 63 Allowance for credit losses $1,814 $1,776 $1,815 1 Related to loans disposed in connection with the sale of PAC . For additional information regarding the sale of PAC , see Note 2 , "Acquisitions/Dispositions." 2 The unfunded commitments reserve is recorded in Other liabilities in the Consolidated Balance Sheets.
Activity in the ALLL by Segment	Activity in the ALLL by loan segment is presented in the following tables: Year Ended December 31, 2017 (Dollars in millions) Commercial Loans Consumer Loans Total Balance, beginning of period $1,124 $585 $1,709 Provision for loan losses 108 289 397 Loan charge-offs (167 ) (324 ) (491 ) Loan recoveries 40 84 124 Other 1 (4 ) — (4 ) Balance, end of period $1,101 $634 $1,735 Year Ended December 31, 2016 (Dollars in millions) Commercial Loans Consumer Loans Total Balance, beginning of period $1,047 $705 $1,752 Provision for loan losses 329 111 440 Loan charge-offs (287 ) (304 ) (591 ) Loan recoveries 35 73 108 Balance, end of period $1,124 $585 $1,709 1 Related to loans disposed in connection with the sale of PAC . For additional information regarding the sale of PAC , see Note 2 , "Acquisitions/Dispositions."
Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses	The Company’s LHFI portfolio and related ALLL is presented in the following tables: December 31, 2017 Commercial Loans Consumer Loans Total (Dollars in millions) Carrying Value Related ALLL Carrying Value Related Carrying Value Related LHFI evaluated for impairment: Individually evaluated $173 $21 $2,648 $183 $2,821 $204 Collectively evaluated 75,304 1,080 64,860 451 140,164 1,531 Total evaluated 75,477 1,101 67,508 634 142,985 1,735 LHFI measured at fair value — — 196 — 196 — Total LHFI $75,477 $1,101 $67,704 $634 $143,181 $1,735 December 31, 2016 Commercial Loans Consumer Loans Total (Dollars in millions) Carrying Related ALLL Carrying Related Carrying Related LHFI evaluated for impairment: Individually evaluated $382 $33 $2,686 $222 $3,068 $255 Collectively evaluated 77,842 1,091 62,166 363 140,008 1,454 Total evaluated 78,224 1,124 64,852 585 143,076 1,709 LHFI measured at fair value — — 222 — 222 — Total LHFI $78,224 $1,124 $65,074 $585 $143,298 $1,709

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Premises and equipment at December 31 consisted of the following: (Dollars in millions) Useful Life (in years) 2017 2016 Land Indefinite $321 $320 Buildings and improvements 1 - 40 1,047 1,028 Leasehold improvements 1 - 30 691 645 Furniture and equipment 1 - 20 1,430 1,492 Construction in progress 488 357 Total premises and equipment 3,977 3,842 Less: Accumulated depreciation and amortization 2,243 2,286 Premises and equipment, net $1,734 $1,556
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The following table presents future minimum payments under noncancelable operating leases, net of sublease rentals, with initial terms in excess of one year at December 31, 2017 . (Dollars in millions) Operating Leases 2018 $205 2019 199 2020 179 2021 167 2022 151 Thereafter 657 Total minimum lease payments $1,558

Goodwill and Other Intangible41

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	(Dollars in millions) Consumer Wholesale Total Balance, January 1, 2017 $4,262 $2,075 $6,337 Measurement period adjustment related to the acquisition of Pillar — 1 1 Sale of PAC — (7 ) (7 ) Balance, December 31, 2017 $4,262 $2,069 $6,331
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]	Changes in the carrying amounts of other intangible assets for the years ended December 31 are presented in the following table: (Dollars in millions) Residential MSRs - Fair Value Commercial Mortgage Servicing Rights and Other Total Balance, January 1, 2017 $1,572 $85 $1,657 Amortization 1 — (20 ) (20 ) Servicing rights originated 394 17 411 Changes in fair value: Due to changes in inputs and assumptions 2 (22 ) — (22 ) Other changes in fair value 3 (226 ) — (226 ) Servicing rights sold (8 ) — (8 ) Other 4 — (1 ) (1 ) Balance, December 31, 2017 $1,710 $81 $1,791 Balance, January 1, 2016 $1,307 $18 $1,325 Amortization 1 — (9 ) (9 ) Servicing rights originated 312 — 312 Servicing rights purchased 200 — 200 Servicing rights acquired in Pillar acquisition — 62 62 Other intangible assets acquired in Pillar acquisition 5 — 14 14 Changes in fair value: Due to changes in inputs and assumptions 2 (13 ) — (13 ) Other changes in fair value 3 (232 ) — (232 ) Servicing rights sold (2 ) — (2 ) Balance, December 31, 2016 $1,572 $85 $1,657 1 Does not include expense associated with non-qualified community development investments. See Note 10 , "Certain Transfers of Financial Assets and Variable Interest Entities," for additional information. 2 Primarily reflects changes in option adjusted spreads and prepayment speed assumptions, due to changes in interest rates. 3 Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time. 4 Represents the first quarter of 2017 measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition. 5 The majority of other intangible assets acquired from Pillar relate to indefinite-lived agency licenses.
Schedule of intangible assets [Table Text Block]	The gross carrying amount and accumulated amortization of other intangible assets are presented in the following table: December 31, 2017 December 31, 2016 (Dollars in millions) Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value Amortized other intangible assets 1 : Commercial mortgage servicing rights $79 ($14 ) $65 $62 $— $62 Other (definite-lived) 32 (28 ) 4 35 (22 ) 13 Unamortized other intangible assets: Residential MSRs (carried at fair value) 1,710 — 1,710 1,572 — 1,572 Other (indefinite-lived) 12 — 12 10 — 10 Total other intangible assets $1,833 ($42 ) $1,791 $1,679 ($22 ) $1,657 1 Excludes fully amortized other intangible assets.
Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs	(Dollars in millions) December 31, 2017 December 31, 2016 Fair value of residential MSRs $1,710 $1,572 Prepayment rate assumption (annual) 13 % 9 % Decline in fair value from 10% adverse change $85 $50 Decline in fair value from 20% adverse change 160 97 Option adjusted spread (annual) 4 % 8 % Decline in fair value from 10% adverse change $47 $63 Decline in fair value from 20% adverse change 90 122 Weighted-average life (in years) 5.4 7.0 Weighted-average coupon 3.9 % 4.0 %
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]	A summary of the key inputs used to estimate the fair value of the Company’s commercial mortgage servicing rights are presented in the following table. (Dollars in millions) December 31, 2017 December 31, 2016 Fair value of commercial mortgage servicing rights $75 $62 Discount rate (annual) 12 % 12 % Prepayment rate assumption (annual) 7 6 Float earnings rate (annual) 1.1 0.5 Weighted-average life (in years) 7.0 7.0
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The Company's estimated future amortization of intangible assets at December 31, 2017 is presented in the following table: (Dollars in millions) 2018 $13 2019 10 2020 9 2021 8 2022 6 Thereafter 23 Total 1 $69 1 Does not include indefinite-lived intangible assets of $12 million .

Borrowings and Contractual Co42

Borrowings and Contractual Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Short-term Debt [Line Items]
Schedule of Short-term Debt [Table Text Block]	Short-term borrowings at December 31 consisted of the following: 2017 2016 (Dollars in millions) Balance Interest Rate Balance Interest Rate Funds purchased $2,561 1.33 % $2,116 0.55 % Securities sold under agreements to repurchase 1,503 1.39 1,633 0.55 Other short-term borrowings 717 1.00 1,015 0.56 Total short-term borrowings $4,781 $4,764
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt at December 31 consisted of the following: 2017 2016 (Dollars in millions) Maturity Date(s) Interest Rate(s) Balance Balance Parent Company Only: Senior, fixed rate 2018 - 2028 2.35% - 6.00% $3,379 $3,818 Senior, variable rate 2018 - 2019 0.25 - 1.53 267 314 Subordinated, fixed rate 2026 6.00 200 200 Junior subordinated, variable rate 2027 - 2028 2.09 - 2.32 628 627 Total 4,474 4,959 Less: Debt issuance costs 8 9 Total Parent Company debt 4,466 4,950 Subsidiaries 1 : Senior, fixed rate 2 2018 - 2057 0.80 - 9.10 3,609 2,539 Senior, variable rate 2020 - 2043 1.04 - 1.84 512 2,613 Subordinated, fixed rate 2018 - 2026 3.30 - 7.25 1,206 1,651 Total 5,327 6,803 Less: Debt issuance costs 8 5 Total subsidiaries debt 5,319 6,798 Total long-term debt 3 $9,785 $11,748
Schedule of Maturities of Long-term Debt [Table Text Block]	Maturities of long-term debt at December 31, 2017 were as follows: (Dollars in millions) Parent Company Subsidiaries 2018 $874 $361 2019 792 27 2020 — 1,508 2021 965 4 2022 990 1,022 Thereafter 853 2,405 Total maturities 4,474 5,327 Less: Debt issuance costs 8 8 Total long-term debt $4,466 $5,319

Certain Transfers of Financia43

Certain Transfers of Financial Assets and Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2017
Certain Transfers of Financial Assets and Variable Interest Entities [Abstract]
Quantitative Information about Transferred Financial Assets that have been Derecognized and Other Financial Assets Managed Together [Table Text Block]	The Company's total managed loans, including the LHFI portfolio and other transferred loans (securitized and unsecuritized), are presented in the following table by portfolio balance and delinquency status (accruing loans 90 days or more past due and all nonaccrual loans) at December 31, 2017 and 2016 , as well as the related net charge-offs for the years ended December 31, 2017 and 2016 . Portfolio Balance Past Due and Nonaccrual Net Charge-offs December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Year Ended December 31 (Dollars in millions) 2017 2016 LHFI portfolio: Commercial $75,477 $78,224 $247 $426 $127 $252 Consumer 67,704 65,074 1,832 1,707 240 231 Total LHFI portfolio 143,181 143,298 2,079 2,133 367 483 Managed securitized loans 1 : Commercial 2 5,760 4,761 — — — — Consumer 134,160 127,153 171 115 8 3 11 3 Total managed securitized loans 139,920 131,914 171 115 8 11 Managed unsecuritized loans 4 2,200 2,985 340 438 — — Total managed loans $285,301 $278,197 $2,590 $2,686 $375 $494 1 Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments). 2 Comprised of commercial mortgages sold through Fannie Mae , Freddie Mac , and Ginnie Mae securitizations, whereby servicing has been retained by the Company. 3 Amounts associated with $602 million and $922 million of managed securitized loans at December 31, 2017 and 2016 , respectively. Net charge-off data is not reported to the Company for the remaining balance of $133.6 billion and $126.2 billion of managed securitized loans at December 31, 2017 and 2016 , respectively. 4 Comprised of unsecuritized loans the Company originated and sold to private investors with servicing rights retained. Net charge-offs on these loans are not presented in the table as the data is not reported to the Company by the private investors that own these related loans.

Borrowings and Contractual Co44

Borrowings and Contractual Commitments Contractual Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Contractual Commitments [Abstract]
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]	Payments Due by Period (Dollars in millions) 2018 2019 2020 2021 2022 Thereafter Total Unfunded lending commitments $25,265 $9,648 $13,773 $13,380 $15,879 $12,066 $90,011 Purchase obligations 1 278 260 76 50 48 247 959 Consumer and other time deposits 2, 3 4,720 2,559 1,331 617 834 2,015 12,076 Brokered time deposits 3 105 181 251 194 178 76 985 Commitments to fund partnership investments 4 690 — — — — — 690

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders	Reconciliations of net income to net income available to common shareholders and the difference between average basic common shares outstanding and average diluted common shares outstanding are presented in the following table. Year Ended December 31 (Dollars and shares in millions, except per share data) 2017 2016 2015 Net income $2,273 $1,878 $1,933 Less: Preferred stock dividends (94 ) (66 ) (64 ) Dividends and undistributed earnings allocated to unvested common share awards — (1 ) (6 ) Net income available to common shareholders $2,179 $1,811 $1,863 Average common shares outstanding - basic 481.3 498.6 514.8 Add dilutive securities: RSUs 3.0 2.9 2.6 Common stock warrants and restricted stock 1.8 0.6 1.7 Stock options 0.9 1.4 1.5 Average common shares outstanding - diluted 487.0 503.5 520.6 Net income per average common share - diluted $4.47 $3.60 $3.58 Net income per average common share - basic 4.53 3.63 3.62

Capital (Tables)

Capital (Tables)	12 Months Ended
	Dec. 31, 2017
Class of Stock [Line Items]
Assets Subject to Regulatory Capital Requirements	The following table presents regulatory capital metrics for SunTrust and the Bank at December 31: 2017 2016 (Dollars in millions) Amount Ratio Amount Ratio SunTrust Banks, Inc. CET1 $17,141 9.74 % $16,953 9.59 % Tier 1 capital 19,622 11.15 18,186 10.28 Total capital 23,028 13.09 21,685 12.26 Leverage 9.80 9.22 SunTrust Bank CET1 $19,474 11.29 % $18,535 10.71 % Tier 1 capital 19,496 11.31 18,573 10.73 Total capital 22,132 12.83 21,276 12.29 Leverage 9.97 9.63
Preferred Stock	Preferred stock at December 31 consisted of the following: (Dollars in millions) 2017 2016 2015 Series A (1,725 shares outstanding) $172 $172 $172 Series B (1,025 shares outstanding) 103 103 103 Series E (4,500 shares outstanding) 450 450 450 Series F (5,000 shares outstanding) 500 500 500 Series G (7,500 shares outstanding) 750 — — Series H (5,000 shares outstanding) 500 — — Total preferred stock $2,475 $1,225 $1,225

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The components of the Provision for income taxes included in the Consolidated Statements of Income for the years ended December 31 are presented in the following table: (Dollars in millions) 2017 2016 2015 Current income tax provision: Federal $129 $667 $707 State 59 27 36 Total 188 694 743 Deferred income tax provision/(benefit): Federal 275 59 27 State 69 52 (6 ) Total 344 111 21 Total provision for income taxes $532 $805 $764
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the income tax provision, using the statutory federal income tax rate of 35% , to the Company’s actual provision for income taxes and the effective tax rate during the years ended December 31 are presented in the following table: 2017 2016 2015 (Dollars in millions) Amount % of Pre-Tax Income Amount % of Pre-Tax Income Amount % of Income tax provision at federal statutory rate $982 35.0 % $939 35.0 % $944 35.0 % Increase/(decrease) resulting from: State income taxes, net 66 2.4 53 2.0 25 0.9 Tax-exempt interest (90 ) (3.2 ) (86 ) (3.2 ) (88 ) (3.3 ) Changes in UTBs (including interest), net 26 0.9 6 0.2 (31 ) (1.1 ) Income tax credits, net of amortization 1 (117 ) (4.2 ) (86 ) (3.2 ) (69 ) (2.6 ) Estimated impact of the remeasurement of DTAs and DTLs and other tax reform-related items 2 (303 ) (10.8 ) — — — — Other 3 (32 ) (1.1 ) (21 ) (0.8 ) (17 ) (0.6 ) Total provision for income taxes and effective tax rate $532 19.0 % $805 30.0 % $764 28.3 % 1 Excludes income tax benefits of $43 million , $2 million , and $6 million for the years ended December 31, 2017, 2016, and 2015 , respectively, related to tax credits, which were recognized as a reduction to the related investment asset. 2 Includes reasonable estimates as of December 31, 2017, which could be adjusted as additional analysis is completed in 2018. 3 Includes excess tax benefits of $25 million and $15 million for the years ended December 31, 2017 and 2016 , respectively, related to the Company's adoption of ASU 2016-09.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The significant DTA s and DTL s at December 31 , net of the federal impact for state taxes, are presented in the following table: (Dollars in millions) 2017 1 2016 2 DTAs: ALLL $412 $639 Net unrealized losses in AOCI 302 472 State NOLs and other carryforwards 227 170 Accruals and reserves 180 343 Other 17 19 Total gross DTAs 1,138 1,643 Valuation allowance (143 ) (80 ) Total DTAs 995 1,563 DTLs: Leasing 459 659 Servicing rights 290 370 Employee compensation and benefits 210 179 Deferred income 193 22 Goodwill and other intangible assets 155 233 Fixed assets 111 113 Loans 104 176 Other 41 43 Total DTLs 1,563 1,795 Net DTL ($568 ) ($232 )
Summary of Income Tax Contingencies [Table Text Block]	The following table provides a rollforward of the Company's gross federal and state UTB s, excluding interest and penalties, during the years ended December 31 : (Dollars in millions) 2017 2016 Balance at January 1 $111 $100 Increases in UTBs related to prior years 22 18 Decreases in UTBs related to prior years (5 ) (4 ) Increases in UTBs related to the current year 13 13 Decreases in UTBs related to settlements — (16 ) Balance at December 31 $141 $111

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The following table presents a summary of stock options, restricted stock, and RSU activity for the year ended December 31, 2017 : Stock Options Restricted Stock RSUs (Dollars in millions, except per share data) Shares Price Weighted Shares Deferred Weighted Shares Weighted Balance, January 1, 2017 3,253,793 $9.06 - 85.34 $42.54 11,312 $— $42.44 4,175,809 $36.27 Granted — — — 8,744 1 57.19 1,901,144 59.95 Exercised/distributed (830,383 ) 9.06 - 64.58 25.38 (11,312 ) — 42.44 (1,703,795 ) 36.62 Cancelled/expired/forfeited (764,105 ) 56.34 - 85.34 81.77 — — — (219,439 ) 44.32 Balance, December 31, 2017 1,659,305 $9.06 - 64.58 $35.33 8,744 $1 $57.19 4,153,719 $44.68 Exercisable, December 31, 2017 1,659,305 $35.33
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	The following table presents stock option information at December 31, 2017 : Options Outstanding Options Exercisable (Dollars in millions, except per share data) Number at December 31, 2017 Weighted Weighted Total Number at December 31, 2017 Weighted Weighted Total Range of Exercise Prices: $9.06 to 49.46 1,170,605 $23.12 3.42 $48,545 1,170,605 $23.12 3.42 $48,545 $64.58 488,700 64.58 0.12 5 488,700 64.58 0.12 5 $9.06 to 64.58 1,659,305 $35.33 2.45 $48,550 1,659,305 $35.33 2.45 $48,550
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block]	Additional option and stock-based compensation information at December 31 is presented in the following table: (Dollars in millions) 2017 2016 2015 Intrinsic value of options exercised 1 $28 $43 $15 Fair value of vested restricted shares 1 — 41 35 Fair value of vested RSUs 1 62 74 23 1 Measured as of the grant date.
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Stock-based compensation expense recognized in Employee compensation in the Consolidated Statements of Income consisted of the following: Years Ended December 31 (Dollars in millions) 2017 2016 2015 RSUs $83 $56 $46 Phantom stock units 1 77 67 32 Restricted stock — 2 16 Stock options — — 1 Total stock-based compensation expense $160 $125 $95 Stock-based compensation tax benefit 2 $61 $48 $36 1 Phantom stock units are settled in cash. The Company paid $80 million , $28 million , and $16 million during the years ended December 31, 2017, 2016, and 2015 , respectively, related to these share-based liabilities. 2 Does not include excess tax benefits or deficiencies recognized in the Provision for income taxes in the Consolidated Statements of Income.
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]	The following table presents the change in benefit obligations, change in fair value of plan assets, funded status, accumulated benefit obligation, and the weighted average discount rate related to the Company's pension and other postretirement benefits plans for the years ended December 31 : Pension Benefits 1 Other Postretirement Benefits (Dollars in millions) 2017 2016 2017 2016 Benefit obligation, beginning of year $2,747 $2,716 $58 $65 Service cost 5 5 — — Interest cost 95 97 1 2 Plan participants’ contributions — — 4 4 Actuarial loss/(gain) 225 76 (1 ) (4 ) Benefits paid (156 ) (142 ) (8 ) (9 ) Administrative expenses paid from pension trust (6 ) (5 ) — — Plan amendments — — (5 ) — Special termination benefits — — 9 — Benefit obligation, end of year 2 $2,910 $2,747 $58 $58 Change in plan assets: Fair value of plan assets, beginning of year $3,016 $2,879 $157 $156 Actual return on plan assets 425 279 11 5 Employer contributions 3 9 5 — — Plan participants’ contributions — — 4 5 Benefits paid (156 ) (142 ) (8 ) (9 ) Administrative expenses paid from pension trust (6 ) (5 ) — — Fair value of plan assets, end of year 4 $3,288 $3,016 $164 $157 Funded status at end of year 5, 6 $378 $269 $106 $99 Funded status at end of year (%) 113 % 110 % Accumulated benefit obligation $2,910 $2,747 Discount rate 3.62 % 4.18 % 3.29 % 3.70 % 1 Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets. 2 Includes $78 million and $80 million of benefit obligations for the unfunded nonqualified supplemental pension plans at December 31, 2017 and 2016 , respectively. 3 The Company contributed less than $1 million to the other postretirement benefits plans during both 2017 and 2016 . 4 Includes $1 million and $2 million of the Company's common stock acquired by the asset manager and held as part of the equity portfolio for pension benefits at December 31, 2017 and 2016 , respectively. During both 2017 and 2016 , there was no SunTrust common stock held in the other postretirement benefit plans. 5 Pension benefits recorded in the Consolidated Balance Sheets included other assets of $456 million and $349 million , and other liabilities of $78 million and $80 million , at December 31, 2017 and 2016 , respectively. 6 Other postretirement benefits recorded in the Consolidated Balance Sheets included other assets of $106 million and $99 million at December 31, 2017 and 2016 , respectively.
Schedule of Net Benefit Costs [Table Text Block]	Components of net periodic benefit related to the Company's pension and other postretirement benefits plans for the years ended December 31 are presented in the following table and are recognized in Employee benefits in the Consolidated Statements of Income: Pension Benefits 1 Other Postretirement Benefits (Dollars in millions) 2017 2016 2015 2017 2016 2015 Service cost $5 $5 $5 $— $— $— Interest cost 95 97 116 1 2 2 Expected return on plan assets (195 ) (186 ) (206 ) (5 ) (5 ) (5 ) Amortization of prior service credit — — — (6 ) (6 ) (6 ) Amortization of actuarial loss 25 25 21 — — — Other — — — 9 — — Net periodic benefit ($70 ) ($59 ) ($64 ) ($1 ) ($9 ) ($9 ) Weighted average assumptions used to determine net periodic benefit: Discount rate 4.18 % 4.44 % 4.09 % 3.70 % 3.95 % 3.60 % Expected return on plan assets 6.66 6.68 6.91 3.12 3.13 3.50 1 Administrative fees are recognized in service cost for each of the periods presented.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	Components of the benefit obligations AOCI balance at December 31 were as follows: Pension Benefits Other Postretirement Benefits (Dollars in millions) 2017 2016 2017 2016 Prior service credit $— $— ($58 ) ($59 ) Net actuarial loss/(gain) 1,001 1,031 (22 ) (15 ) Total AOCI, pre-tax $1,001 $1,031 ($80 ) ($74 ) Other changes in plan assets and benefit obligations recognized in AOCI during 2017 were as follows: (Dollars in millions) Pension Benefits Other Postretirement Benefits Current year prior service credit $— ($5 ) Current year actuarial gain (5 ) (7 ) Amortization of prior service credit — 6 Amortization of actuarial loss (25 ) — Total recognized in AOCI, pre-tax ($30 ) ($6 ) Total recognized in net periodic benefit and AOCI, pre-tax ($100 ) ($7 )
Schedule of Allocation of Plan Assets [Table Text Block]	The following tables present combined pension and other postretirement benefit plan assets measured at fair value. See Note 18 , "Fair Value Election and Measurement" for level definitions within the fair value hierarchy. Fair Value Measurements at December 31, 2017 1 (Dollars in millions) Total Level 1 Level 2 Level 3 Money market funds 2 $138 $138 $— $— Equity securities 936 936 — — Mutual funds 3 : Equity index fund 56 56 — — Tax exempt municipal bond funds 85 85 — — Taxable fixed income index funds 12 12 — — Futures contracts (5 ) (5 ) — — Fixed income securities 2,201 512 1,689 — Other assets 9 9 — — Total plan assets $3,432 $1,743 $1,689 $— 1 Fair value measurements do not include pension benefits accrued income amounting to less than 0.7% of total plan assets. 2 Includes $11 million for other postretirement benefit plans. 3 Relates exclusively to other postretirement benefit plans. Fair Value Measurements at December 31, 2016 1 (Dollars in millions) Total Level 1 Level 2 Level 3 Money market funds 2 $112 $112 $— $— Equity securities 1,415 1,415 — — Mutual funds 3 : Equity index fund 47 47 — — Tax exempt municipal bond funds 82 82 — — Taxable fixed income index funds 13 13 — — Futures contracts (5 ) — (5 ) — Fixed income securities 1,486 — 1,486 — Other assets 6 6 — — Total plan assets $3,156 $1,675 $1,481 $— 1 Fair value measurements do not include pension benefits accrued income amounting to less than 0.6% of total plan assets. 2 Includes $16 million for other postretirement benefit plans. 3 Relates exclusively to other postretirement benefit plans. Target allocations for pension and other postretirement benefits at December 31, by asset category, are presented below: Pension Benefits Other Postretirement Benefits 2017 Target Allocation % of plan assets 2017 Target Allocation % of plan assets 2017 2016 2017 2016 Cash equivalents 0-10 % 4 % 3 % 5-15 % 7 % 10 % Equity securities 0-40 29 47 20-40 34 30 Debt securities 40-100 67 50 50-70 59 60 Total 100 % 100 % 100 % 100 %
Schedule of Expected Benefit Payments [Table Text Block]	Expected cash flows for the pension and other postretirement benefit plans are presented in the following table: (Dollars in millions) Pension Benefits 1 Other Postretirement Benefits (excluding Medicare Subsidy) 2 Employer Contributions: 2018 (expected) to plan trusts $— $— 2018 (expected) to plan participants 3 9 — Expected Benefit Payments: 2018 210 7 2019 172 6 2020 172 6 2021 170 6 2022 167 5 2023 - 2027 824 18 1 Based on the funding status and ERISA limitations, the Company anticipates contributions to the Retirement Plan will not be required during 2018 . 2 Expected payments under other postretirement benefit plans are shown net of participant contributions. 3 The expected benefit payments for the SERP will be paid directly from the Company's corporate assets.

Guarantees (Tables)

Guarantees (Tables)	12 Months Ended
	Dec. 31, 2017
Guarantees [Abstract]
Mortgage Loan Repurchase Losses [Table Text Block]	The following table summarizes the changes in the Company’s reserve for residential mortgage loan repurchases for the years ended December 31 : (Dollars in millions) 2017 2016 2015 Balance, beginning of period $40 $57 $85 Repurchase provision/(benefit) — (17 ) (12 ) Charge-offs, net of recoveries (1 ) — (16 ) Balance, end of period $39 $40 $57
Repurchased Mortgage Loan [Table Text Block]	The following table summarizes the carrying value of the Company's outstanding repurchased residential mortgage loans at December 31 : (Dollars in millions) 2017 2016 Outstanding repurchased residential mortgage loans: Performing LHFI $203 $230 Nonperforming LHFI 16 12 Total carrying value of outstanding repurchased residential mortgages $219 $242

Derivative Financial Instrume50

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments [Table Text Block]	The following tables present the Company’s derivative positions at December 31, 2017 and 2016 . The notional amounts in the tables are presented on a gross basis and have been classified within derivative assets or derivative liabilities based on the estimated fair value of the individual contract at December 31, 2017 and 2016 . Gross positive and gross negative fair value amounts associated with respective notional amounts are presented without consideration of any netting agreements, including collateral arrangements. Net fair value derivative amounts are adjusted on an aggregate basis, where applicable, to take into consideration the effects of legally enforceable master netting agreements, including any cash collateral received or paid, and are recognized in Trading assets and derivative instruments or Trading liabilities and derivative instruments on the Consolidated Balance Sheets. For contracts constituting a combination of options that contain a written option and a purchased option (such as a collar), the notional amount of each option is presented separately, with the purchased notional amount generally being presented as a derivative asset and the written notional amount being presented as a derivative liability. For other contracts that contain a combination of options, the fair value is generally presented as a single value with the purchased notional amount if the combined fair value is positive, and with the written notional amount if the combined fair value is negative. December 31, 2017 Asset Derivatives Liability Derivatives (Dollars in millions) Notional Amounts Fair Value Notional Amounts Fair Value Derivative instruments designated in cash flow hedging relationships 1 Interest rate contracts hedging floating rate LHFI $5,850 $2 $8,350 $252 Derivative instruments designated in fair value hedging relationships 2 Interest rate contracts hedging fixed rate debt 1,250 1 4,670 58 Interest rate contracts hedging brokered CDs 30 — 30 — Total 1,280 1 4,700 58 Derivative instruments not designated as hedging instruments 3 Interest rate contracts hedging: Residential MSRs 4 31,895 119 10,126 119 LHFS, IRLCs 5 4,550 9 3,040 6 LHFI 90 2 85 2 Trading activity 6 78,223 1,066 48,143 946 Foreign exchange rate contracts hedging loans and trading activity 3,409 110 3,649 102 Credit contracts hedging: LHFI — — 515 11 Trading activity 7 1,721 15 1,733 12 Equity contracts hedging trading activity 6 13,837 2,499 25,070 2,857 Other contracts: IRLCs and other 8 1,671 18 346 16 Commodity derivatives 712 63 710 61 Total 136,108 3,901 93,417 4,132 Total derivative instruments $143,238 $3,904 $106,467 $4,442 Total gross derivative instruments, before netting $3,904 $4,442 Less: Legally enforceable master netting agreements (2,731 ) (2,731 ) Less: Cash collateral received/paid (371 ) (1,303 ) Total derivative instruments, after netting $802 $408 1 See “Cash Flow Hedges” in this Note for further discussion. 2 See “Fair Value Hedges” in this Note for further discussion. 3 See “Economic Hedging and Trading Activities” in this Note for further discussion. 4 Amount includes $16.6 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 5 Amount includes $190 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 6 Amounts include $9.8 billion of notional amounts related to interest rate futures and $1.2 billion of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt. 7 Asset and liability amounts include $4 million and $11 million , respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor. 8 Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares , the conversion ratio from Class B shares to Class A shares , and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16 , “Guarantees” for additional information. December 31, 2016 Asset Derivatives Liability Derivatives (Dollars in millions) Notional Amounts Fair Value Notional Amounts Fair Value Derivative instruments designated in cash flow hedging relationships 1 Interest rate contracts hedging floating rate LHFI $6,400 $34 $11,050 $265 Derivative instruments designated in fair value hedging relationships 2 Interest rate contracts hedging fixed rate debt 600 2 4,510 81 Interest rate contracts hedging brokered CDs 60 — 30 — Total 660 2 4,540 81 Derivative instruments not designated as hedging instruments 3 Interest rate contracts hedging: Residential MSRs 4 12,165 413 18,774 335 LHFS, IRLCs 5 11,774 134 8,306 58 LHFI 100 2 36 1 Trading activity 6 70,599 1,536 67,477 1,401 Foreign exchange rate contracts hedging loans and trading activity 3,231 161 3,360 148 Credit contracts hedging: LHFI 15 — 620 8 Trading activity 7 2,128 34 2,271 33 Equity contracts hedging trading activity 6 17,225 2,095 28,658 2,477 Other contracts: IRLCs and other 8 2,412 28 668 22 Commodity derivatives 747 75 746 73 Total 120,396 4,478 130,916 4,556 Total derivative instruments $127,456 $4,514 $146,506 $4,902 Total gross derivative instruments, before netting $4,514 $4,902 Less: Legally enforceable master netting agreements (3,239 ) (3,239 ) Less: Cash collateral received/paid (291 ) (1,265 ) Total derivative instruments, after netting $984 $398 1 See “Cash Flow Hedges” in this Note for further discussion. 2 See “Fair Value Hedges” in this Note for further discussion. 3 See “Economic Hedging and Trading Activities” in this Note for further discussion. 4 Amount includes $6.7 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 5 Amount includes $720 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. 6 Amounts include $12.3 billion of notional amounts related to interest rate futures and $629 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt. 7 Asset and liability amounts include $5 million and $13 million , respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor. 8 Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares , the conversion ratio from Class B shares to Class A shares , and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16 , “Guarantees” for additional information.
Derivative Instruments, Gain (Loss) [Table Text Block]	The impacts of derivative instruments on the Consolidated Statements of Income and the Consolidated Statements of Shareholders’ Equity for the years ended December 31, 2017, 2016, and 2015 are presented in the following tables. The impacts are segregated between derivatives that are designated in hedge accounting relationships and those that are used for economic hedging or trading purposes, with further identification of the underlying risks in the derivatives and the hedged items, where appropriate. The tables do not disclose the financial impact of the activities that these derivative instruments are intended to hedge. Year Ended December 31, 2017 (Dollars in millions) Amount of Pre-tax Loss (Effective Portion) Amount of Pre-tax Gain Reclassified from AOCI into Income Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 ($54 ) $38 Interest and fees on loans held for investment 1 During the year ended December 31, 2017 , the Company also reclassified $51 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2017 (Dollars in millions) Amount of Loss on Derivatives Amount of Gain on Related Hedged Items Amount of Gain Recognized in Income on Hedges Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($38 ) $40 $2 Interest rate contracts hedging brokered CDs 1 — — — Total ($38 ) $40 $2 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2017 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $42 LHFS, IRLCs Mortgage production related income (54 ) Trading activity Trading income 42 Foreign exchange rate contracts hedging loans and trading activity Trading income (37 ) Credit contracts hedging: LHFI Other noninterest income (4 ) Trading activity Trading income 26 Other contracts: IRLCs and other Mortgage production related income, Commercial real estate related income 185 Commodity derivatives Trading income 1 Total $201 Year Ended December 31, 2016 (Dollars in millions) Amount of Pre-tax Loss Recognized in OCI on Derivatives (Effective Portion) Amount of Pre-tax Gain Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 ($145 ) $147 Interest and fees on loans held for investment 1 During the year ended December 31, 2016 , the Company also reclassified $97 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2016 (Dollars in millions) Amount of Loss on Derivatives Amount of Gain Amount of Gain Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($87 ) $89 $2 Interest rate contracts hedging brokered CDs 1 — — — Total ($87 ) $89 $2 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2016 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $62 LHFS, IRLCs Mortgage production related income (6 ) LHFI Other noninterest income (1 ) Trading activity Trading income 51 Foreign exchange rate contracts hedging loans and trading activity Trading income 101 Credit contracts hedging: LHFI Other noninterest income (3 ) Trading activity Trading income 19 Equity contracts hedging trading activity Trading income 4 Other contracts: IRLCs Mortgage production related income 210 Commodity derivatives Trading income 3 Total $440 Year Ended December 31, 2015 (Dollars in millions) Amount of Pre-tax Gain Recognized in OCI on Derivatives (Effective Portion) Amount of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Classification of Pre-tax Gain Reclassified from AOCI into Income (Effective Portion) Derivative instruments in cash flow hedging relationships: Interest rate contracts hedging floating rate LHFI 1 $246 $169 Interest and fees on loans held for investment 1 During the year ended December 31, 2015 , the Company also reclassified $92 million pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized. Year Ended December 31, 2015 (Dollars in millions) Amount of Loss on Derivatives Recognized in Income Amount of Gain on Related Hedged Items Amount of Loss Derivative instruments in fair value hedging relationships: Interest rate contracts hedging fixed rate debt 1 ($2 ) $1 ($1 ) Interest rate contracts hedging brokered CDs 1 — — — Total ($2 ) $1 ($1 ) 1 Amounts are recognized in Trading income in the Consolidated Statements of Income. (Dollars in millions) Classification of Gain/(Loss) Recognized in Income on Derivatives Amount of Gain/(Loss) Recognized in Income on Derivatives During the Year Ended December 31, 2015 Derivative instruments not designated as hedging instruments: Interest rate contracts hedging: Residential MSRs Mortgage servicing related income $19 LHFS, IRLCs Mortgage production related income (45 ) LHFI Other noninterest income (1 ) Trading activity Trading income 61 Foreign exchange rate contracts hedging loans and trading activity Trading income 93 Credit contracts hedging: LHFI Other noninterest income (1 ) Trading activity Trading income 23 Equity contracts hedging trading activity Trading income 4 Other contracts: IRLCs Mortgage production related income 156 Commodities Trading income 2 Total $311
Netting of Financial Instruments - Derivatives [Table Text Block]	The following tables present total gross derivative instrument assets and liabilities at December 31, 2017 and 2016 , which are adjusted to reflect the effects of legally enforceable master netting agreements and cash collateral received or paid when calculating the net amount reported in the Consolidated Balance Sheets. Also included in the tables are financial instrument collateral related to legally enforceable master netting agreements that represents securities collateral received or pledged and customer cash collateral held at third party custodians. These amounts are not offset on the Consolidated Balance Sheets but are shown as a reduction to total derivative instrument assets and liabilities to derive net derivative assets and liabilities. These amounts are limited to the derivative asset/liability balance, and accordingly, do not include excess collateral received/pledged. (Dollars in millions) Gross Amount Amount Offset Net Amount Presented in Consolidated Balance Sheets Held/Pledged Financial Instruments Net Amount December 31, 2017 Derivative instrument assets: Derivatives subject to master netting arrangement or similar arrangement $3,491 $2,923 $568 $28 $540 Derivatives not subject to master netting arrangement or similar arrangement 18 — 18 — 18 Exchange traded derivatives 395 179 216 — 216 Total derivative instrument assets $3,904 $3,102 $802 1 $28 $774 Derivative instrument liabilities: Derivatives subject to master netting arrangement or similar arrangement $4,128 $3,855 $273 $27 $246 Derivatives not subject to master netting arrangement or similar arrangement 130 — 130 — 130 Exchange traded derivatives 184 179 5 — 5 Total derivative instrument liabilities $4,442 $4,034 $408 2 $27 $381 December 31, 2016 Derivative instrument assets: Derivatives subject to master netting arrangement or similar arrangement $4,193 $3,384 $809 $48 $761 Derivatives not subject to master netting arrangement or similar arrangement 27 — 27 — 27 Exchange traded derivatives 294 146 148 — 148 Total derivative instrument assets $4,514 $3,530 $984 1 $48 $936 Derivative instrument liabilities: Derivatives subject to master netting arrangement or similar arrangement $4,649 $4,358 $291 $33 $258 Derivatives not subject to master netting arrangement or similar arrangement 105 — 105 — 105 Exchange traded derivatives 148 146 2 — 2 Total derivative instrument liabilities $4,902 $4,504 $398 2 $33 $365 1 At December 31, 2017 , $802 million , net of $371 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016 , $984 million , net of $291 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. 2 At December 31, 2017 , $408 million , net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016 , $398 million , net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

Fair Value Election and Measu51

Fair Value Election and Measurement (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	Recurring Fair Value Measurements The following tables present certain information regarding assets and liabilities measured at fair value on a recurring basis and the changes in fair value for those specific financial instruments for which fair value has been elected. December 31, 2017 Fair Value Measurements (Dollars in millions) Level 1 Level 2 Level 3 Netting Adjustments 1 Assets/Liabilities at Fair Value Assets Trading assets and derivative instruments: U.S. Treasury securities $157 $— $— $— $157 Federal agency securities — 395 — — 395 U.S. states and political subdivisions — 61 — — 61 MBS - agency — 700 — — 700 Corporate and other debt securities — 655 — — 655 CP — 118 — — 118 Equity securities 56 — — — 56 Derivative instruments 395 3,493 16 (3,102 ) 802 Trading loans — 2,149 — — 2,149 Total trading assets and derivative instruments 608 7,571 16 (3,102 ) 5,093 Securities AFS: U.S. Treasury securities 4,331 — — — 4,331 Federal agency securities — 259 — — 259 U.S. states and political subdivisions — 617 — — 617 MBS - agency residential — 22,704 — — 22,704 MBS - agency commercial — 2,086 — — 2,086 MBS - non-agency residential — — 59 — 59 MBS - non-agency commercial — 866 — — 866 ABS — — 8 — 8 Corporate and other debt securities — 12 5 — 17 Other equity securities 2 51 — 418 — 469 Total securities AFS 4,382 26,544 490 — 31,416 LHFS — 1,577 — — 1,577 LHFI — — 196 — 196 Residential MSRs — — 1,710 — 1,710 Liabilities Trading liabilities and derivative instruments: U.S. Treasury securities 577 — — — 577 Corporate and other debt securities — 289 — — 289 Equity securities 9 — — — 9 Derivative instruments 183 4,243 16 (4,034 ) 408 Total trading liabilities and derivative instruments 769 4,532 16 (4,034 ) 1,283 Brokered time deposits — 236 — — 236 Long-term debt — 530 — — 530 1 Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17 , "Derivative Financial Instruments," for additional information. 2 Includes $49 million of mutual fund investments, $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, and $2 million of other. December 31, 2016 Fair Value Measurements (Dollars in millions) Level 1 Level 2 Level 3 Netting Adjustments 1 Assets/Liabilities at Fair Value Assets Trading assets and derivative instruments: U.S. Treasury securities $539 $— $— $— $539 Federal agency securities — 480 — — 480 U.S. states and political subdivisions — 134 — — 134 MBS - agency — 567 — — 567 CLO securities — 1 — — 1 Corporate and other debt securities — 656 — — 656 CP — 140 — — 140 Equity securities 49 — — — 49 Derivative instruments 293 4,193 28 (3,530 ) 984 Trading loans — 2,517 — — 2,517 Total trading assets and derivative instruments 881 8,688 28 (3,530 ) 6,067 Securities AFS: U.S. Treasury securities 5,405 — — — 5,405 Federal agency securities — 313 — — 313 U.S. states and political subdivisions — 275 4 — 279 MBS - agency residential — 22,436 — — 22,436 MBS - agency commercial — 1,226 — — 1,226 MBS - non-agency residential — — 74 — 74 MBS - non-agency commercial — 252 — — 252 ABS — — 10 — 10 Corporate and other debt securities — 30 5 — 35 Other equity securities 2 102 — 540 — 642 Total securities AFS 5,507 24,532 633 — 30,672 LHFS — 3,528 12 — 3,540 LHFI — — 222 — 222 Residential MSRs — — 1,572 — 1,572 Liabilities Trading liabilities and derivative instruments: U.S. Treasury securities 697 — — — 697 MBS - agency — 1 — — 1 Corporate and other debt securities — 255 — — 255 Derivative instruments 149 4,731 22 (4,504 ) 398 Total trading liabilities and derivative instruments 846 4,987 22 (4,504 ) 1,351 Brokered time deposits — 78 — — 78 Long-term debt — 963 — — 963 1 Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17 , "Derivative Financial Instruments," for additional information. 2 Includes $102 million of mutual fund investments, $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $6 million of other.
Fair Value Option Elected, Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance	(Dollars in millions) Fair Value at December 31, 2017 Aggregate UPB at December 31, 2017 Fair Value Over/(Under) Unpaid Principal Assets: Trading loans $2,149 $2,111 $38 LHFS: Accruing 1,576 1,533 43 Past due 90 days or more 1 1 — LHFI: Accruing 192 198 (6 ) Nonaccrual 4 6 (2 ) Liabilities: Brokered time deposits 236 233 3 Long-term debt 530 517 13 (Dollars in millions) Fair Value at December 31, 2016 Aggregate UPB at December 31, 2016 Fair Value Over/(Under) Unpaid Principal Assets: Trading loans $2,517 $2,488 $29 LHFS: Accruing 3,540 3,516 24 LHFI: Accruing 219 225 (6 ) Nonaccrual 3 4 (1 ) Liabilities: Brokered time deposits 78 80 (2 ) Long-term debt 963 924 39
Change in Fair Value of Financial Instruments for which the FVO has been Elected	Fair Value Gain/(Loss) for the Year Ended December 31, 2017 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Income Mortgage 1 Mortgage Servicing Related Income Other Noninterest Income Total Changes in Fair Values Included in Earnings 2 Assets: Trading loans $21 $— $— $— $21 LHFS — 61 — — 61 Residential MSRs — 5 (248 ) — (243 ) Liabilities: Long-term debt 21 — — — 21 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2017 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2017 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income. Fair Value Gain/(Loss) for the Year Ended December 31, 2016 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Mortgage 1 Mortgage Other Total 2 Assets: Trading loans $15 $— $— $— $15 LHFS — 75 — — 75 Residential MSRs — 3 (245 ) — (242 ) Liabilities: Brokered time deposits 4 — — — 4 Long-term debt 27 — — — 27 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2016 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2016 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, brokered time deposits, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income. Fair Value (Loss)/Gain for the Year Ended December 31, 2015 for Items Measured at Fair Value Pursuant to Election of the FVO (Dollars in millions) Trading Mortgage 1 Mortgage Other Total 2 Assets: Trading loans ($1 ) $— $— $— ($1 ) LHFS — 44 — — 44 LHFI — — — 5 5 Residential MSRs — 2 (242 ) — (240 ) Liabilities: Long-term debt 41 — — — 41 1 Income related to LHFS does not include income from IRLC s. For the year ended December 31, 2015 , income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM . 2 Changes in fair value for the year ended December 31, 2015 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, LHFI, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income.
Fair Value Level 3 Significant Unobservable Input Assumptions [Table Text Block]	The valuation technique and range, including weighted average, of the unobservable inputs associated with the Company's level 3 assets and liabilities are as follows: Level 3 Significant Unobservable Input Assumptions (Dollars in millions) Fair value December 31, 2017 Valuation Technique Unobservable Input 1 Range (weighted average) Assets Trading assets and derivative instruments: Derivative instruments, net 2 $— Internal model Pull through rate 41-100% (81%) MSR value 41-190 bps (113 bps) Securities AFS: MBS - non-agency residential 59 Third party pricing N/A ABS 8 Third party pricing N/A Corporate and other debt securities 5 Cost N/A Other equity securities 418 Cost N/A LHFI 192 Monte Carlo/Discounted cash flow Option adjusted spread 62-784 bps (215 bps) Conditional prepayment rate 2-34 CPR (11 CPR) Conditional default rate 0-5 CDR (0.7 CDR) 4 Collateral based pricing Appraised value NM 3 Residential MSRs 1,710 Monte Carlo/Discounted cash flow Conditional prepayment rate 6-30 CPR (13 CPR) Option adjusted spread 1-125% (4%) 1 For certain assets and liabilities where the Company utilizes third party pricing, the unobservable inputs and their ranges are not reasonably available, and therefore, have been noted as not applicable ("N/A"). 2 Amount represents the net of IRLC assets and liabilities and includes the derivative liability associated with the Company's sale of Visa shares. Refer to the "Trading Liabilities and Derivative Instruments" section herein for a discussion of valuation assumptions related to the Visa derivative liability. 3 Not meaningful. Level 3 Significant Unobservable Input Assumptions (Dollars in millions) Fair value December 31, 2016 Valuation Technique Unobservable Input 1 Range (weighted average) Assets Trading assets and derivative instruments: Derivative instruments, net 2 $6 Internal model Pull through rate 40-100% (81%) MSR value 22-170 bps (106 bps) Securities AFS: U.S. states and political subdivisions 4 Cost N/A MBS - non-agency residential 74 Third party pricing N/A ABS 10 Third party pricing N/A Corporate and other debt securities 5 Cost N/A Other equity securities 540 Cost N/A Residential LHFS 12 Monte Carlo/Discounted cash flow Option adjusted spread 104-125 bps (124 bps) Conditional prepayment rate 2-28 CPR (7 CPR) Conditional default rate 0-3 CDR (0.4 CDR) LHFI 219 Monte Carlo/Discounted cash flow Option adjusted spread 62-784 bps (184 bps) Conditional prepayment rate 3-36 CPR (13 CPR) Conditional default rate 0-5 CDR (2.1 CDR) 3 Collateral based pricing Appraised value NM 3 Residential MSRs 1,572 Monte Carlo/Discounted cash flow Conditional prepayment rate 1-25 CPR (9 CPR) Option adjusted spread 0-122% (8%) 1 For certain assets and liabilities where the Company utilizes third party pricing, the unobservable inputs and their ranges are not reasonably available, and therefore, have been noted as not applicable ("N/A"). 2 Amount represents the net of IRLC assets and liabilities and includes the derivative liability associated with the Company's sale of Visa shares. Refer to the "Trading Liabilities and Derivative Instruments" section herein for a discussion of valuation assumptions related to the Visa derivative liability. 3 Not meaningful.
Reconciliation of the Beginning and Ending Balances for Fair Valued Assets and Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs	Fair Value Measurements Using Significant Unobservable Inputs (Dollars in millions) Beginning Included OCI Purchases Sales Settlements Transfers to/from Other Balance Sheet Line Items Transfers Transfers Fair Value Included in Earnings (held at December 31, 2017 1 ) Assets Trading assets: Derivative instruments, net $6 $185 2 $— $— $— $— ($191 ) $— $— $— $12 2 Securities AFS: U.S. states and political subdivisions 4 — — — — (4 ) — — — — — MBS - non-agency residential 74 (1 ) 1 3 — — (15 ) — — — 59 (1 ) ABS 10 — 1 3 — — (3 ) — — — 8 — Corporate and other debt securities 5 — — — — — — — — 5 — Other equity securities 540 1 (1 ) 3 75 (1 ) (191 ) — — (5 ) 418 — Total securities AFS 633 — 1 3 75 (1 ) (213 ) — — (5 ) 490 (1 ) Residential LHFS 12 — — — (25 ) (1 ) (4 ) 26 (8 ) — — LHFI 222 — — — — (34 ) 3 5 — 196 (1 ) 4 1 Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at December 31, 2017 . 2 Includes issuances, fair value changes, and expirations. Amount related to residential IRLC s is recognized in Mortgage production related income, amount related to commercial IRLC s is recognized in Commercial real estate related income, and amount related to Visa derivative liability is recognized in Other noninterest expense. 3 Amounts recognized in OCI are included in change in net unrealized gains on securities AFS, net of tax. 4 Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income. Fair Value Measurements Using Significant Unobservable Inputs (Dollars in millions) Beginning Included OCI Purchases Sales Settlements Transfers to/from Other Balance Sheet Line Items Transfers Transfers Fair Value Included in Earnings (held at December 31, 2016 1 ) Assets Trading assets: Corporate and other debt securities $89 ($1 ) 2 $— $— ($88 ) $— $— $— $— $— $— Derivative instruments, net 15 198 3 — 2 — 2 (211 ) — — 6 7 3 Total trading assets 104 197 — 2 (88 ) 2 (211 ) — — 6 7 Securities AFS: U.S. states and political subdivisions 5 — — — — (1 ) — — — 4 — MBS - non-agency residential 94 — 1 4 — — (21 ) — — — 74 — ABS 12 — 1 4 — — (3 ) — — — 10 — Corporate and other debt securities 5 — — — — — — — — 5 — Other equity securities 440 — — 308 — (208 ) — — — 540 — Total securities AFS 556 — 2 4 308 — (233 ) — — — 633 — Residential LHFS 5 (1 ) 5 — — (35 ) — (5 ) 52 (4 ) 12 (1 ) 5 LHFI 257 (2 ) 5 — — — (44 ) 1 10 — 222 (2 ) 5 Liabilities Other liabilities 23 — — — — (23 ) — — — — — 1 Change in unrealized gains/(losses) included in earnings during the period related to financial assets/liabilities still held at December 31, 2016 . 2 Amounts included in earnings are recognized in Trading income. 3 Includes issuances, fair value changes, and expirations. Amount related to residential IRLC s is recognized in Mortgage production related income and amount related to Visa derivative liability is recognized in Other noninterest expense. 4 Amounts recognized in OCI are included in change in net unrealized gains/(losses) on securities AFS, net of tax. 5 Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income.
Change in Carrying Value of Assets Measured at Fair Value on a Non-Recurring Basis	Fair Value Measurements Losses for the December 31, 2017 (Dollars in millions) December 31, 2017 Level 1 Level 2 Level 3 LHFS $13 $— $13 $— $— LHFI 49 — — 49 — OREO 24 — 1 23 (4 ) Other assets 53 — 4 49 (43 ) Fair Value Measurements Losses for the December 31, 2016 (Dollars in millions) December 31, 2016 Level 1 Level 2 Level 3 LHFI $75 $— $— $75 $— OREO 17 — — 17 (2 ) Other assets 112 — 58 54 (36 )
Carrying Amounts and Fair Values of the Company's Financial Instruments	December 31, 2017 Fair Value Measurements (Dollars in millions) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $6,912 $6,912 $6,912 $— $— (a) Trading assets and derivative instruments 5,093 5,093 608 4,469 16 (b) Securities AFS 31,416 31,416 4,382 26,544 490 (b) LHFS 2,290 2,293 — 2,239 54 (c) LHFI, net 141,446 141,575 — — 141,575 (d) Financial liabilities: Deposits 160,780 160,586 — 160,586 — (e) Short-term borrowings 4,781 4,781 — 4,781 — (f) Long-term debt 9,785 9,892 — 8,834 1,058 (f) Trading liabilities and derivative instruments 1,283 1,283 769 498 16 (b) December 31, 2016 Fair Value Measurements (Dollars in millions) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $6,423 $6,423 $6,423 $— $— (a) Trading assets and derivative instruments 6,067 6,067 881 5,158 28 (b) Securities AFS 30,672 30,672 5,507 24,532 633 (b) LHFS 4,169 4,178 — 4,161 17 (c) LHFI, net 141,589 140,516 — 282 140,234 (d) Financial liabilities: Deposits 160,398 160,280 — 160,280 — (e) Short-term borrowings 4,764 4,764 — 4,764 — (f) Long-term debt 11,748 11,779 — 11,051 728 (f) Trading liabilities and derivative instruments 1,351 1,351 846 483 22 (b) The following methods and assumptions were used by the Company in estimating the fair value of financial instruments: (a) Cash and cash equivalents are valued at their carrying amounts, which are reasonable estimates of fair value due to the relatively short period to maturity of the instruments. (b) Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote. (c) LHFS are generally valued based on observable current market prices or, if quoted market prices are not available, quoted market prices of similar instruments. Refer to the LHFS section within this footnote for further discussion. When valuation assumptions are not readily observable in the market, instruments are valued based on the best available data to approximate fair value. This data may be internally developed and considers risk premiums that a market participant would require under then-current market conditions. (d) LHFI fair values are based on a hypothetical exit price, which does not represent the estimated intrinsic value of the loan if held for investment. The assumptions used are expected to approximate those that a market participant purchasing the loans would use to value the loans, including a market risk premium and liquidity discount. Estimating the fair value of the loan portfolio when loan sales and trading markets are illiquid or nonexistent requires significant judgment. Generally, the Company measures fair value for LHFI based on estimated future discounted cash flows using current origination rates for loans with similar terms and credit quality, which derived an estimated value of 101% on the loan portfolio’s net carrying value at both December 31, 2017 and 2016 . The value derived from origination rates likely does not represent an exit price; therefore, an incremental market risk and liquidity discount was applied when estimating the fair value of these loans. The discounted value is a function of a market participant’s required yield in the current environment and is not a reflection of the expected cumulative losses on the loans. (e) Deposit liabilities with no defined maturity such as DDA s, NOW /money market accounts, and savings accounts have a fair value equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). Fair values for CD s are estimated using a discounted cash flow approach that applies current interest rates to a schedule of aggregated expected maturities. The assumptions used in the discounted cash flow analysis are expected to approximate those that market participants would use in valuing deposits. The value of long-term relationships with depositors is not taken into account in estimating fair values. Refer to the respective valuation section within this footnote for valuation information related to brokered time deposits that the Company measures at fair value as well as those that are carried at amortized cost. (f) Fair values for short-term borrowings and certain long-term debt are based on quoted market prices for similar instruments or estimated discounted cash flows utilizing the Company’s current incremental borrowing rate for similar types of instruments. Refer to the respective valuation section within this footnote for valuation information related to long-term debt that the Company measures at fair value. For level 3 debt, the terms are unique in nature or there are no similar instruments that can be used to value the instrument without using significant unobservable assumptions.

Business Segment Reporting Busi

Business Segment Reporting Business Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segment Reporting [Table Text Block]	Year Ended December 31, 2017 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $72,622 $71,521 $76 ($3 ) $144,216 Average consumer and commercial deposits 102,820 56,618 175 (64 ) 159,549 Average total assets 82,507 85,227 34,567 2,630 204,931 Average total liabilities 103,757 62,291 14,610 (28 ) 180,630 Average total equity — — — 24,301 24,301 Statements of Income: Net interest income $3,698 $2,247 ($44 ) ($268 ) $5,633 FTE adjustment — 142 3 — 145 Net interest income-FTE 1 3,698 2,389 (41 ) (268 ) 5,778 Provision for credit losses 2 368 41 — — 409 Net interest income after provision for credit losses-FTE 3,330 2,348 (41 ) (268 ) 5,369 Total noninterest income 1,874 1,710 (33 ) (197 ) 3,354 Total noninterest expense 3,842 1,869 73 (20 ) 5,764 Income before provision for income taxes-FTE 1,362 2,189 (147 ) (445 ) 2,959 Provision for income taxes-FTE 3, 4 491 816 (355 ) (275 ) 677 Net income including income attributable to noncontrolling interest 871 1,373 208 (170 ) 2,282 Less: Net income attributable to noncontrolling interest — — 9 — 9 Net income $871 $1,373 $199 ($170 ) $2,273 1 Presented on a matched maturity funds transfer price basis for the segments. 2 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 3 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals. 4 Tax effects resulting from the 2017 Tax Act are included in Corporate Other. Year Ended December 31, 2016 1 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $69,455 $71,600 $66 ($3 ) $141,118 Average consumer and commercial deposits 99,424 54,713 124 (72 ) 154,189 Average total assets 79,118 85,494 31,952 2,440 199,004 Average total liabilities 100,423 60,438 14,148 (73 ) 174,936 Average total equity — — — 24,068 24,068 Statements of Income: Net interest income $3,465 $2,018 $101 ($363 ) $5,221 FTE adjustment — 136 2 — 138 Net interest income-FTE 2 3,465 2,154 103 (363 ) 5,359 Provision for credit losses 3 172 272 — — 444 Net interest income after provision for credit losses-FTE 3,293 1,882 103 (363 ) 4,915 Total noninterest income 2,036 1,356 138 (147 ) 3,383 Total noninterest expense 3,796 1,676 13 (17 ) 5,468 Income before provision for income taxes-FTE 1,533 1,562 228 (493 ) 2,830 Provision for income taxes-FTE 4 568 583 59 (267 ) 943 Net income including income attributable to noncontrolling interest 965 979 169 (226 ) 1,887 Less: Net income attributable to noncontrolling interest — — 9 — 9 Net income $965 $979 $160 ($226 ) $1,878 1 Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation. 2 Presented on a matched maturity funds transfer price basis for the segments. 3 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 4 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals. Year Ended December 31, 2015 1 (Dollars in millions) Consumer Wholesale Corporate Other Reconciling Consolidated Balance Sheets: Average LHFI $65,637 $67,872 $60 ($11 ) $133,558 Average consumer and commercial deposits 93,789 50,373 101 (60 ) 144,203 Average total assets 75,204 80,903 29,668 3,117 188,892 Average total liabilities 94,801 56,044 14,771 (70 ) 165,546 Average total equity — — — 23,346 23,346 Statements of Income: Net interest income $3,324 $1,918 $152 ($630 ) $4,764 FTE adjustment 1 138 3 — 142 Net interest income-FTE 2 3,325 2,056 155 (630 ) 4,906 Provision for credit losses 3 27 137 — 1 165 Net interest income after provision for credit losses-FTE 3,298 1,919 155 (631 ) 4,741 Total noninterest income 1,967 1,285 137 (121 ) 3,268 Total noninterest expense 3,631 1,523 17 (11 ) 5,160 Income before provision for income taxes-FTE 1,634 1,681 275 (741 ) 2,849 Provision for income taxes-FTE 4 553 628 81 (356 ) 906 Net income including income attributable to noncontrolling interest 1,081 1,053 194 (385 ) 1,943 Less: Net income attributable to noncontrolling interest — — 10 — 10 Net income $1,081 $1,053 $184 ($385 ) $1,933 1 Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation. 2 Presented on a matched maturity funds transfer price basis for the segments. 3 Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances. 4 Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals.

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Changes in the components of AOCI, net of tax, are presented in the following table: (Dollars in millions) Securities AFS Derivative Instruments Brokered Time Deposits Long-Term Debt Employee Benefit Plans Total Year Ended December 31, 2017 Balance, beginning of period ($62 ) ($157 ) ($1 ) ($7 ) ($594 ) ($821 ) Net unrealized (losses)/gains arising during the period (7 ) (31 ) — 3 11 (24 ) Amounts reclassified to net income 68 (56 ) — — 13 25 Other comprehensive income/(loss), net of tax 61 (87 ) — 3 24 1 Balance, end of period ($1 ) ($244 ) ($1 ) ($4 ) ($570 ) ($820 ) Year Ended December 31, 2016 Balance, beginning of period $135 $87 $— $— ($682 ) ($460 ) Cumulative credit risk adjustment 1 — — — (5 ) — (5 ) Net unrealized (losses)/gains arising during the period (194 ) (91 ) (1 ) (2 ) 76 (212 ) Amounts reclassified to net income (3 ) (153 ) — — 12 (144 ) Other comprehensive (loss)/income, net of tax (197 ) (244 ) (1 ) (2 ) 88 (356 ) Balance, end of period ($62 ) ($157 ) ($1 ) ($7 ) ($594 ) ($821 ) Year Ended December 31, 2015 Balance, beginning of period $298 $97 $— $— ($517 ) ($122 ) Net unrealized (losses)/gains arising during the period (150 ) 154 — — (174 ) (170 ) Amounts reclassified to net income (13 ) (164 ) — — 9 (168 ) Other comprehensive loss, net of tax (163 ) (10 ) — — (165 ) (338 ) Balance, end of period $135 $87 $— $— ($682 ) ($460 ) 1 Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1 , "Significant Accounting Policies," for additional information.
Schedule of Reclassifications from AOCI [Table Text Block]	Reclassifications from AOCI to Net income, and the related tax effects, are presented in the following table: (Dollars in millions) Year Ended December 31 Impacted Line Item in the Consolidated Statements of Income Details About AOCI Components 2017 2016 2015 Securities AFS: Realized losses/(gains) on securities AFS $108 ($4 ) ($21 ) Net securities (losses)/gains Tax effect (40 ) 1 8 Provision for income taxes 68 (3 ) (13 ) Derivative Instruments: Realized gains on cash flow hedges (89 ) (244 ) (261 ) Interest and fees on loans held for investment Tax effect 33 91 97 Provision for income taxes (56 ) (153 ) (164 ) Employee Benefit Plans: Amortization of prior service credit (6 ) (6 ) (6 ) Employee benefits Amortization of actuarial loss 25 25 21 Employee benefits 19 19 15 Tax effect (6 ) (7 ) (6 ) Provision for income taxes 13 12 9 Total reclassifications from AOCI to net income $25 ($144 ) ($168 )

SunTrust Banks, Inc. (Parent 54

SunTrust Banks, Inc. (Parent Company Only) Financial Information Income Statement (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Income Statement [Table Text Block]	Year Ended December 31 (Dollars in millions) 2017 2016 2015 Income Dividends 1 $1,414 $1,300 $1,159 Interest from loans to subsidiaries 25 15 8 Interest from deposits at banks 22 12 5 Other income 5 2 9 Total income 1,466 1,329 1,181 Expense Interest on short-term borrowings 4 2 1 Interest on long-term debt 137 140 128 Employee compensation and benefits 2 103 57 69 Service fees to subsidiaries 12 12 6 Other expense 33 24 21 Total expense 289 235 225 Income before income tax benefit and equity in undistributed income of subsidiaries 1,177 1,094 956 Income tax benefit 72 59 61 Income before equity in undistributed income of subsidiaries 1,249 1,153 1,017 Equity in undistributed income of subsidiaries 1,024 725 916 Net income $2,273 $1,878 $1,933 Total other comprehensive income/(loss), net of tax 1 (356 ) (338 ) Total comprehensive income $2,274 $1,522 $1,595 1 Substantially all dividend income is from subsidiaries (primarily the Bank). 2 Includes incentive compensation allocations between the Parent Company and subsidiaries.

SunTrust Banks, Inc. (Parent 55

SunTrust Banks, Inc. (Parent Company Only) Financial Information Balance Sheets (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Balance Sheet [Table Text Block]	December 31 (Dollars in millions) 2017 2016 Assets Cash held at SunTrust Bank $701 $535 Interest-bearing deposits held at SunTrust Bank 2,144 1,126 Interest-bearing deposits held at other banks 24 23 Cash and cash equivalents 2,869 1,684 Securities available for sale 123 147 Loans to subsidiaries 1,218 2,516 Investment in capital stock of subsidiaries stated on the basis of the Company’s equity in subsidiaries’ capital accounts: Banking subsidiaries 24,590 23,617 Nonbanking subsidiaries 1,423 1,359 Goodwill 211 211 Other assets 547 528 Total assets $30,981 $30,062 Liabilities Short-term borrowings: Subsidiaries $205 $283 Non-affiliated companies 350 483 Long-term debt: Non-affiliated companies 4,466 4,950 Other liabilities 909 831 Total liabilities 5,930 6,547 Shareholders’ Equity Preferred stock 2,475 1,225 Common stock 550 550 Additional paid-in capital 9,000 9,010 Retained earnings 17,540 16,000 Treasury stock, at cost, and other (3,694 ) (2,449 ) Accumulated other comprehensive loss, net of tax (820 ) (821 ) Total shareholders’ equity 25,051 23,515 Total liabilities and shareholders’ equity $30,981 $30,062

SunTrust Banks, Inc. (Parent 56

SunTrust Banks, Inc. (Parent Company Only) Financial Information Cash Flow (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Condensed Cash Flow Statement [Table Text Block]	Statements of Cash Flows - Parent Company Only Year Ended December 31 (Dollars in millions) 2017 2016 2015 Cash Flows from Operating Activities: Net income $2,273 $1,878 $1,933 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiaries (1,024 ) (725 ) (916 ) Depreciation, amortization, and accretion 5 3 6 Deferred income tax expense/(benefit) 5 11 (4 ) Stock-based compensation — 3 11 Net securities (gains)/losses (1 ) — — Net increase in other assets (15 ) (129 ) (72 ) Net increase/(decrease) in other liabilities 122 62 (28 ) Net cash provided by operating activities 1,365 1,103 930 Cash Flows from Investing Activities: Proceeds from maturities, calls, and paydowns of securities available for sale 38 49 66 Proceeds from sales of securities available for sale 1 4 — Purchases of securities available for sale (17 ) (4 ) (15 ) Net decrease/(increase) in loans to subsidiaries 1,298 (889 ) 1,042 Other, net — (3 ) (2 ) Net cash provided by/(used in) investing activities 1,320 (843 ) 1,091 Cash Flows from Financing Activities: Net (decrease)/increase in short-term borrowings (211 ) 5 (763 ) Proceeds from long-term debt 9 2,005 — Repayment of long-term debt (482 ) (1,784 ) (29 ) Proceeds from the issuance of preferred stock 1,239 — — Repurchase of common stock (1,314 ) (806 ) (679 ) Repurchase of common stock warrants — (24 ) — Common and preferred dividends paid (723 ) (564 ) (539 ) Taxes paid related to net share settlement of equity awards (39 ) (48 ) (36 ) Proceeds from the exercise of stock options 21 25 17 Net cash used in financing activities (1,500 ) (1,191 ) (2,029 ) Net increase/(decrease) in cash and cash equivalents 1,185 (931 ) (8 ) Cash and cash equivalents at beginning of period 1,684 2,615 2,623 Cash and cash equivalents at end of period $2,869 $1,684 $2,615 Supplemental Disclosures: Income taxes paid to subsidiaries ($489 ) ($886 ) ($499 ) Income taxes received by Parent Company 414 812 481 Net income taxes paid by Parent Company ($75 ) ($74 ) ($18 ) Interest paid $140 $135 $130

Significant Accounting Polici57

Significant Accounting Policies Significant Accounting Policies Additional Information (Details) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Minimum [Member]
Significant Accounting Policies [Line Items]
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals		$ 1,000
Cash Proceeds from BOLI/COLI [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		3	$ 17
Cash Premiums Paid on BOLI/COLI [Member] [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		127	202
Contingent Consideration Paid Up to Amount of Acquisition Date Fair Value [Member] [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0	13
Contingent Consideration Paid in Excess of Acquisition Date Fair Value [Member] [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 0	$ 10
Stranded Tax Effects in AOCI [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 154

Acquisitions_Dispositions Acq58

Acquisitions/Dispositions Acquisitions/Dispositions - Schedule of Business Acquisitions, by Acquisition (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Assets		$ 205,962	$ 204,875
Proceeds from Divestiture of Businesses		261	0	$ 0
Goodwill, Written off Related to Sale of Business Unit		7
Gain (Loss) on Disposition of Business		107	0	$ 0
Premium Assignment Corporation [Member]
Business Acquisition [Line Items]
Assets		1,300
Proceeds from Divestiture of Businesses		261
Goodwill, Written off Related to Sale of Business Unit		7
Intangible Assets, Written off Related to Sale of Business Unit		0
Gain (Loss) on Disposition of Business		107
Pillar Financial [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			(197)
Goodwill, Acquired During Period		1
Indefinite-lived Intangible Assets Acquired	[1]	$ 13
Business Combination, Bargain Purchase, Gain Recognized, Amount			$ 0
[1]	Does not include $62 million of commercial mortgage servicing rights acquired.

Acquisitions_Dispositions Acq59

Acquisitions/Dispositions Acquisitions/Dispositions - Schedule of Subsidiary Income Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noninterest Expense	$ 5,764	$ 5,468	[1]	$ 5,160	[2]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,959	2,830	[1]	2,849	[2]
Premium Assignment Corporation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	56	60		59
Noninterest Expense	31	27		22
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 25	$ 33		$ 37
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

Acquisitions_Dispositions Acq60

Acquisitions/Dispositions Acquisitions/Dispositions - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 15, 2016
Business Acquisition [Line Items]
Assets		$ 205,962	$ 204,875
Total liabilities		180,808	181,257
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		2,959	2,830	[1]	$ 2,849	[2]
Noninterest Expense		5,764	5,468	[1]	5,160	[2]
Proceeds from Divestiture of Businesses		261	0		0
Gain (Loss) on Disposition of Business		107	0		0
Premium Assignment Corporation [Member]
Business Acquisition [Line Items]
Assets		1,300
Total liabilities		1,200
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		25	33		37
Revenues		56	60		59
Noninterest Expense		31	27		22
Proceeds from Divestiture of Businesses		261
Gain (Loss) on Disposition of Business		107
Pillar Financial [Member]
Business Combinations [Abstract]
Indefinite-lived Intangible Assets Acquired	[3]	13
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			(197)
Wholesale [Member]
Business Acquisition [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		2,189	1,562	[1]	1,681	[2]
Noninterest Expense		$ 1,869	1,676	[1]	$ 1,523	[2]
Commercial Mortgage Servicing Rights [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets							$ 62
Commercial Mortgage Servicing Rights [Member] | Pillar Financial [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			$ 62
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	Does not include $62 million of commercial mortgage servicing rights acquired.

Federal Funds Sold and Securi61

Federal Funds Sold and Securities Financing Activities - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Securities Purchased under Agreements to Resell [Abstract]
Federal Funds Sold	$ 65	$ 58
Fair Value of Securities Received as Collateral that Can be Resold or Repledged	1,500	1,300
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged	$ 177	$ 246

Schedule of Resale Agreements (

Schedule of Resale Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Securities Purchased under Agreements to Resell [Abstract]
Federal Funds Sold	$ 65	$ 58
Securities Borrowed	298	270
Securities Purchased under Agreements to Resell	1,175	979
Federal Funds Sold and Securities Purchased under Agreements to Resell	$ 1,538	$ 1,307

Federal Funds Sold and Securi63

Federal Funds Sold and Securities Financing Activities Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	$ 1,503	$ 1,633
US Treasury Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	95	27
US Government Agencies Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	116	312
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	829	844
Commercial Paper [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	19	49
Corporate Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	444	401
Maturity Overnight [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	1,225	1,468
Maturity Overnight [Member] | US Treasury Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	95	27
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	101	288
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	694	793
Maturity Overnight [Member] | Commercial Paper [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	19	49
Maturity Overnight [Member] | Corporate Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	316	311
Maturity up to 30 days [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	238	125
Maturity up to 30 days [Member] | US Treasury Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity up to 30 days [Member] | US Government Agencies Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	15	24
Maturity up to 30 days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	135	51
Maturity up to 30 days [Member] | Commercial Paper [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity up to 30 days [Member] | Corporate Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	88	50
Maturity 30 to 90 Days [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	40	40
Maturity 30 to 90 Days [Member] | US Treasury Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity 30 to 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity 30 to 90 Days [Member] | Commercial Paper [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	0	0
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member]
securities sold under agreement to repurchase maturity [Line Items]
Securities Sold under Agreements to Repurchase	$ 40	$ 40

Federal Funds Sold and Securi64

Federal Funds Sold and Securities Financing Activities Netting of Financial Instruments - Repurchase Agreements (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed		$ 1,473	$ 1,249
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	[1]	1,473	1,249
Securities Purchased under Agreements to Resell, Fair Value of Collateral		1,462	1,241
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement		11	8
Securities Borrowed or Purchased Under Agreements to Resell, Amount Not Offset Against Collateral		0	0
Securities Sold under Agreements to Repurchase, Gross		1,503	1,633
Securities Sold under Agreements to Repurchase		1,503	1,633
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities		1,503	1,633
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement		0	0
Securities Sold Under Agreements to Repurchase, Amount Not Offset Against Collateral		$ 0	$ 0
[1]	Excludes $65 million and $58 million of Fed Funds sold, which are not subject to a master netting agreement at December 31, 2017 and 2016, respectively.

Trading Securities (Detail)

Trading Securities (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	[1]	$ 5,093	$ 6,067
Trading liabilities		1,283	1,351
US Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		157	539
Trading liabilities		577	697
US Government Agencies Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		395	480
US States and Political Subdivisions Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		61	134
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		700	567
Trading liabilities		0	1
Collateralized Loan Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		0	1
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		655	656
Trading liabilities		289	255
Commercial Paper [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		118	140
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		56	49
Trading liabilities		9	0
Derivative Financial Instruments, Assets [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	[2]	802	984
Loans [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	[3]	2,149	2,517
Derivative Financial Instruments, Liabilities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities	[2]	$ 408	$ 398
[1]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Amounts include the impact of offsetting cash collateral received from and paid to the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists.
[3]	Includes loans related to TRS.

Schedule of Financial Instrumen

Schedule of Financial Instruments Owned and Pledged as Collateral (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of Repurchase Agreements Secured by Trading Assets		$ 975	$ 928
Repurchase Agreements [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Trading Securities Pledged as Collateral	[1]	1,016	968
Derivative [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Trading Securities Pledged as Collateral		72	471
Equity Trading [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Trading Securities Pledged as Collateral		$ 41	$ 40
[1]	Repurchase agreements secured by collateral totaled $975 million and $928 million at December 31, 2017 and 2016, respectively.

Securities Available for Sale67

Securities Available for Sale (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 31,385	$ 30,729
Unrealized Gains		250	335
Unrealized Losses		219	392
Available-for-sale Securities	[1]	31,416	30,672
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4,361	5,486
Unrealized Gains		2	5
Unrealized Losses		32	86
Available-for-sale Securities		4,331	5,405
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		257	310
Unrealized Gains		3	5
Unrealized Losses		1	2
Available-for-sale Securities		259	313
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		618	279
Unrealized Gains		7	5
Unrealized Losses		8	5
Available-for-sale Securities		617	279
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6	8
Unrealized Gains		2	2
Unrealized Losses		0	0
Available-for-sale Securities		8	10
Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		17	34
Unrealized Gains		0	1
Unrealized Losses		0	0
Available-for-sale Securities		17	35
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[2]	472	642
Unrealized Gains	[2]	0	1
Unrealized Losses	[2]	3	1
Available-for-sale Securities	[2]	469	642
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,121	1,263
Unrealized Gains		3	2
Unrealized Losses		38	39
Available-for-sale Securities		2,086	1,226
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		862	257
Unrealized Gains		7	0
Unrealized Losses		3	5
Available-for-sale Securities		866	252
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		22,616	22,379
Unrealized Gains		222	311
Unrealized Losses		134	254
Available-for-sale Securities		22,704	22,436
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		55	71
Unrealized Gains		4	3
Unrealized Losses		0	0
Available-for-sale Securities		$ 59	$ 74
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[2]	At December 31, 2017, the fair value of other equity securities was comprised of the following: $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, $49 million of mutual fund investments, and $2 million of other.At December 31, 2016, the fair value of other equity securities was comprised of the following: $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $102 million of mutual fund investments, and $6 million of other.

Securities Available for Sale68

Securities Available for Sale (Addition Information) (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	[1]	$ 31,416		$ 30,672
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	[2]	469		642
Federal Home Loan Bank (FHLB) of Atlanta stock (par value)		15		132
Federal Reserve Bank Stock		403		402
Mutual fund investments (par value)		49		102
Fair Value, Inputs, Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	[3]	490		633
Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		31,416		30,672
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		490		633
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Fair Value Disclosure		2		6
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		$ 418	[4]	$ 540	[5]
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[2]	At December 31, 2017, the fair value of other equity securities was comprised of the following: $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, $49 million of mutual fund investments, and $2 million of other.At December 31, 2016, the fair value of other equity securities was comprised of the following: $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $102 million of mutual fund investments, and $6 million of other.
[3]	Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote.
[4]	Includes $49 million of mutual fund investments, $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, and $2 million of other.
[5]	Includes $102 million of mutual fund investments, $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $6 million of other.

Interest and dividends on SAFS

Interest and dividends on SAFS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Interest Income, Securities, Taxable	$ 743	$ 630	$ 552
Interest Income, Securities, Tax Exempt	13	6	6
Dividend Income, Operating	18	15	35
Interest and Dividend Income, Securities, Available-for-sale	$ 774	$ 651	$ 593

Securities Available for Sale -

Securities Available for Sale - Additional Information (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities Pledged as Collateral		$ 4,300	$ 2,000
Available-for-sale Securities	[1]	$ 31,416	$ 30,672
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.

Amortized Cost and Fair Value o

Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life (Detail) $ in Millions	Dec. 31, 2017USD ($)
Distribution of Maturities: Amortized Cost, 1 Year or Less	$ 2,820
Distribution of Maturities: Amortized Cost, 1-5 Years	10,752
Distribution of Maturities: Amortized Cost, 5-10 Years	16,333
Distribution of Maturities: Amortized Cost, After 10 Years	1,008
Distribution of Maturities: Amortized Cost, Total	30,913
Distribution of Maturities: Fair Value, 1 Year or Less	2,884
Distribution of Maturities: Fair Value, 1-5 Years	10,781
Distribution of Maturities: Fair Value, 5-10 Years	16,287
Distribution of Maturities: Fair Value, After 10 Years	995
Distribution of Maturities: Fair Value, Total	$ 30,947
Available For Sale Securities Debt Maturities, Yield, One Year Or Less	3.36%	[1]
Available For Sale Securities Debt Maturities, Yield, After One Through Five Years	2.34%	[1]
Available For Sale Securities Debt Maturities, Yield, After Five Through Ten Years	2.81%	[1]
Available For Sale Securities Debt Maturities, Yield, After Ten Years	3.23%	[1]
Available For Sale Securities Debt Maturities, Yield	2.71%	[1]
US Treasury Securities [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	$ 0
Distribution of Maturities: Amortized Cost, 1-5 Years	2,322
Distribution of Maturities: Amortized Cost, 5-10 Years	2,039
Distribution of Maturities: Amortized Cost, After 10 Years	0
Distribution of Maturities: Amortized Cost, Total	4,361
Distribution of Maturities: Fair Value, 1 Year or Less	0
Distribution of Maturities: Fair Value, 1-5 Years	2,305
Distribution of Maturities: Fair Value, 5-10 Years	2,026
Distribution of Maturities: Fair Value, After 10 Years	0
Distribution of Maturities: Fair Value, Total	4,331
US Government Agencies Debt Securities [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	121
Distribution of Maturities: Amortized Cost, 1-5 Years	46
Distribution of Maturities: Amortized Cost, 5-10 Years	4
Distribution of Maturities: Amortized Cost, After 10 Years	86
Distribution of Maturities: Amortized Cost, Total	257
Distribution of Maturities: Fair Value, 1 Year or Less	123
Distribution of Maturities: Fair Value, 1-5 Years	47
Distribution of Maturities: Fair Value, 5-10 Years	4
Distribution of Maturities: Fair Value, After 10 Years	85
Distribution of Maturities: Fair Value, Total	259
US States and Political Subdivisions Debt Securities [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	6
Distribution of Maturities: Amortized Cost, 1-5 Years	49
Distribution of Maturities: Amortized Cost, 5-10 Years	149
Distribution of Maturities: Amortized Cost, After 10 Years	414
Distribution of Maturities: Amortized Cost, Total	618
Distribution of Maturities: Fair Value, 1 Year or Less	6
Distribution of Maturities: Fair Value, 1-5 Years	52
Distribution of Maturities: Fair Value, 5-10 Years	153
Distribution of Maturities: Fair Value, After 10 Years	406
Distribution of Maturities: Fair Value, Total	617
Asset-backed Securities [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	0
Distribution of Maturities: Amortized Cost, 1-5 Years	6
Distribution of Maturities: Amortized Cost, 5-10 Years	0
Distribution of Maturities: Amortized Cost, After 10 Years	0
Distribution of Maturities: Amortized Cost, Total	6
Distribution of Maturities: Fair Value, 1 Year or Less	0
Distribution of Maturities: Fair Value, 1-5 Years	8
Distribution of Maturities: Fair Value, 5-10 Years	0
Distribution of Maturities: Fair Value, After 10 Years	0
Distribution of Maturities: Fair Value, Total	8
Other Debt Obligations [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	7
Distribution of Maturities: Amortized Cost, 1-5 Years	10
Distribution of Maturities: Amortized Cost, 5-10 Years	0
Distribution of Maturities: Amortized Cost, After 10 Years	0
Distribution of Maturities: Amortized Cost, Total	17
Distribution of Maturities: Fair Value, 1 Year or Less	7
Distribution of Maturities: Fair Value, 1-5 Years	10
Distribution of Maturities: Fair Value, 5-10 Years	0
Distribution of Maturities: Fair Value, After 10 Years	0
Distribution of Maturities: Fair Value, Total	17
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	2,686
Distribution of Maturities: Amortized Cost, 1-5 Years	7,937
Distribution of Maturities: Amortized Cost, 5-10 Years	11,781
Distribution of Maturities: Amortized Cost, After 10 Years	212
Distribution of Maturities: Amortized Cost, Total	22,616
Distribution of Maturities: Fair Value, 1 Year or Less	2,748
Distribution of Maturities: Fair Value, 1-5 Years	7,980
Distribution of Maturities: Fair Value, 5-10 Years	11,763
Distribution of Maturities: Fair Value, After 10 Years	213
Distribution of Maturities: Fair Value, Total	22,704
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	0
Distribution of Maturities: Amortized Cost, 1-5 Years	55
Distribution of Maturities: Amortized Cost, 5-10 Years	0
Distribution of Maturities: Amortized Cost, After 10 Years	0
Distribution of Maturities: Amortized Cost, Total	55
Distribution of Maturities: Fair Value, 1 Year or Less	0
Distribution of Maturities: Fair Value, 1-5 Years	59
Distribution of Maturities: Fair Value, 5-10 Years	0
Distribution of Maturities: Fair Value, After 10 Years	0
Distribution of Maturities: Fair Value, Total	59
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	0
Distribution of Maturities: Amortized Cost, 1-5 Years	315
Distribution of Maturities: Amortized Cost, 5-10 Years	1,547
Distribution of Maturities: Amortized Cost, After 10 Years	259
Distribution of Maturities: Amortized Cost, Total	2,121
Distribution of Maturities: Fair Value, 1 Year or Less	0
Distribution of Maturities: Fair Value, 1-5 Years	308
Distribution of Maturities: Fair Value, 5-10 Years	1,525
Distribution of Maturities: Fair Value, After 10 Years	253
Distribution of Maturities: Fair Value, Total	2,086
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Distribution of Maturities: Amortized Cost, 1 Year or Less	0
Distribution of Maturities: Amortized Cost, 1-5 Years	12
Distribution of Maturities: Amortized Cost, 5-10 Years	813
Distribution of Maturities: Amortized Cost, After 10 Years	37
Distribution of Maturities: Amortized Cost, Total	862
Distribution of Maturities: Fair Value, 1 Year or Less	0
Distribution of Maturities: Fair Value, 1-5 Years	12
Distribution of Maturities: Fair Value, 5-10 Years	816
Distribution of Maturities: Fair Value, After 10 Years	38
Distribution of Maturities: Fair Value, Total	$ 866
[1]	Weighted average yields are based on amortized cost and presented on an FTE basis.

Securities with Unrealized Loss

Securities with Unrealized Losses (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 11,409	[1]	$ 19,459	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		63	[3]	383	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,738	[1]	464	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		156	[3]	9	[4]
Total, Fair Value		18,147	[1]	19,923	[2]
Total, Unrealized Losses		219	[3]	392	[4]
Other Than Temporarily Impaired Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0	[1]	16	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1	[1]	1	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0	[3]	0	[4]
Total, Fair Value		1	[1]	17	[2]
Total, Unrealized Losses		0	[3]	0	[4]
Other Than Temporarily Impaired Securities [Member] | Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0	[1]	0	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1	[1]	1	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0	[3]	0	[4]
Total, Fair Value		1	[1]	1	[2]
Total, Unrealized Losses		0	[3]	0	[4]
Other Than Temporarily Impaired Securities [Member] | Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[2]			16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	[4]			0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[2]			0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	[4]			0
Total, Fair Value	[2]			16
Total, Unrealized Losses	[4]			0
Temporarily Impaired Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		11,409		19,443
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		63	[3]	383	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		6,737		463
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		156	[3]	9	[4]
Total, Fair Value		18,146		19,906
Total, Unrealized Losses		219	[3]	392	[4]
Temporarily Impaired Securities [Member] | US Treasury Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		1,993		4,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		12	[3]	86	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		841		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		20	[3]	0	[4]
Total, Fair Value		2,834		4,380
Total, Unrealized Losses		32	[3]	86	[4]
Temporarily Impaired Securities [Member] | US Government Agencies Debt Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		23		96
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	2	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		60		3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		1	[3]	0	[4]
Total, Fair Value		83		99
Total, Unrealized Losses		1	[3]	2	[4]
Temporarily Impaired Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		267		149
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		3	[3]	5	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		114		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		5	[3]	0	[4]
Total, Fair Value		381		149
Total, Unrealized Losses		8	[3]	5	[4]
Temporarily Impaired Securities [Member] | Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4		5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0	[3]	0	[4]
Total, Fair Value		4		5
Total, Unrealized Losses		0	[3]	0	[4]
Temporarily Impaired Securities [Member] | Other Debt Obligations [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		10		12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		0	[3]	0	[4]
Total, Fair Value		10		12
Total, Unrealized Losses		0	[3]	0	[4]
Temporarily Impaired Securities [Member] | Equity Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		0	[3]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		2		4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		3	[3]	1	[4]
Total, Fair Value		2		4
Total, Unrealized Losses		3	[3]	1	[4]
Temporarily Impaired Securities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		887		1,117
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		9	[3]	38	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		915		15
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		29	[3]	1	[4]
Total, Fair Value		1,802		1,132
Total, Unrealized Losses		38	[3]	39	[4]
Temporarily Impaired Securities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		134		184
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		1	[3]	5	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		93		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		2	[3]	0	[4]
Total, Fair Value		227		184
Total, Unrealized Losses		3	[3]	5	[4]
Temporarily Impaired Securities [Member] | Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investments, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		8,095		13,505
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		38	[3]	247	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4,708		436
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		96	[3]	7	[4]
Total, Fair Value		12,803		13,941
Total, Unrealized Losses		$ 134	[3]	$ 254	[4]
[1]	OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.
[2]	OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.
[3]	Unrealized losses less than $0.5 million are presented as zero within the table.
[4]	Unrealized losses less than $0.5 million are presented as zero within the table.

Gross Realized Gains and Losses

Gross Realized Gains and Losses on Sales and OTTI on Securities Available for Sale (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Gross Realized Gains		$ 3	$ 4	$ 25
Available-for-sale Securities, Gross Realized Losses		(110)	0	(3)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment		(1)	0	(1)
Gain (Loss) on Sale of Securities, Net		108	(4)	$ (21)
Available-for-sale Securities	[1]	$ 31,416	$ 30,672
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.

OTTI Losses on Available for Sa

OTTI Losses on Available for Sale Securities (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities	[1]	$ 31,416	$ 30,672
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held		23	23	$ 25
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment		$ 1	$ 0	$ 1
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.

Rollforward of Credit Losses Re

Rollforward of Credit Losses Recognized in Earnings Related to Securities (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment		$ 1	$ 0	$ 1
Available-for-sale Securities	[1]	31,416	30,672
Ending balance		$ 23	$ 23	$ 25
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.

Significant Inputs Considered i

Significant Inputs Considered in Determining the Measurement of Credit Losses Recognized in Earnings for Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Investment [Line Items]
Available-for-sale Securities, Debt Securities	$ 30,947
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate	3.00%	9.00%
Other than Temporary Impairment Losses, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Prepayment Rate	19.00%	13.00%
Other Than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Loss Severity	41.00%	56.00%
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Other Than Temporarily Impaired Securities [Member]
Investment [Line Items]
Available-for-sale Securities, Debt Securities	$ 12	$ 20

Loans - Additional Information

Loans - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other Real Estate	[1]	$ 57	$ 60
Transfer of Portfolio Loans and Leases to Held-for-sale		288	360	$ 1,790
Transfer of Loans Held-for-sale to Portfolio Loans		19	30	$ 741
Loans held for investment sold		705	1,600
Gain (Loss) on Sales of Loans, Net			(6)
Long-term Debt	[2],[3]	9,785	11,748
Other Short-term Borrowings		717	1,015
Letters of Credit Outstanding, Amount		6,700	7,300
Loans and Leases Receivable, Impaired, Commitment to Lend		2	29
Loans held for investment	[4]	143,181	143,298
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		$ 3,740	$ 3,693
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Loan Portfolio Current		28.00%	29.00%
Loans held for investment		$ 560	$ 537
Government Guarantee Percent		1.00%	1.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment purchased		$ 1,729	$ 2,200
Percentage of Loan Portfolio Current		75.00%	75.00%
Loans held for investment		$ 6,633	$ 6,167
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment purchased		233
Loans held for investment		12,140	10,736
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other Real Estate		51	50
Loans held for investment		$ 38,620	$ 38,990
Percentage of Loans Held for Investment		27.00%	27.00%
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other Real Estate		$ 4	$ 7
Loans held for investment		75,477	78,224
Geographic Distribution, Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,400	2,200
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[5]	10,626	11,912
Minimum [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans And Leases Receivable Individually Evaluated For Impairment		3	3
Home Equity Line of Credit [Member] | Credit Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit		10,100	10,300
Mortgage Loans on Real Estate [Member] | Credit Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit		3,000	4,200
Federal Home Loan Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Long-term Debt		4	2,754
Federal Reserve Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Pledged as Collateral		24,300	22,600
Line of Credit Facility, Remaining Borrowing Capacity		18,200	17,000
Federal Home Loan Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Pledged as Collateral		38,000	36,900
Line of Credit Facility, Remaining Borrowing Capacity		$ 30,500	$ 31,900
[1]	Does not include foreclosed real estate related to loans insured by the FHA or guaranteed by the VA. Proceeds due from the FHA and the VA are recorded as a receivable in Other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA and the VA totaled $45 million and $50 million at December 31, 2017 and 2016, respectively.
[2]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[3]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[4]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[5]	Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016, respectively, for which there was nominal risk of principal loss due to the government guarantee.

Composition of the Company's Lo

Composition of the Company's Loan Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[1]	$ 143,181		$ 143,298
Loans Held for Sale	[2]	2,290		4,169
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[3]	66,356		69,213
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		5,317		4,996
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		3,804		4,015
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		75,477		78,224
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		560		537
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[4],[5]	27,136	[6]	26,137	[7]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[4]	10,626		11,912
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[4]	298		404
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		6,633		6,167
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		8,729		7,771
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		12,140		10,736
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,582		1,410
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		$ 67,704		$ 65,074
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes $1.6 billion and $3.5 billion of LHFS measured at fair value at December 31, 2017 and 2016, respectively.
[3]	Includes $3.7 billion of lease financing at both December 31, 2017 and 2016, and $778 million and $729 million of installment loans at December 31, 2017 and 2016, respectively.
[4]	Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016, respectively, for which there was nominal risk of principal loss due to the government guarantee.
[5]	Includes $196 million and $222 million of LHFI measured at fair value at December 31, 2017 and 2016, respectively.
[6]	Includes $196 million of loans measured at fair value, the majority of which were accruing current.
[7]	Includes $222 million of loans measured at fair value, the majority of which were accruing current.

Composition of the Company's 79

Composition of the Company's Loan Portfolio (Additional Information) (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	[1]	$ 143,181	$ 143,298
Loans Receivable, Fair Value Disclosure		196	222
Loans Held-for-sale, Fair Value Disclosure		1,577	3,540
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		3,740	3,693
Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		778	729
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		67,704	65,074
Loans Receivable, Fair Value Disclosure		$ 196	$ 222
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.

LHFI by Credit Quality Indicato

LHFI by Credit Quality Indicator (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[1]	$ 143,181		$ 143,298
Financing Receivable, Recorded Investment, Nonaccrual Status	[3]	674	[2]	845	[4]
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[5]	66,356		69,213
Financing Receivable, Recorded Investment, Nonaccrual Status		215	[2]	390	[4]
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		5,317		4,996
Financing Receivable, Recorded Investment, Nonaccrual Status		24	[2]	7	[4]
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		3,804		4,015
Financing Receivable, Recorded Investment, Nonaccrual Status		1	[2]	17	[4]
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6],[7]	27,136	[8]	26,137	[9]
Financing Receivable, Recorded Investment, Nonaccrual Status		206	[2],[8]	177	[4],[9]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	10,626		11,912
Financing Receivable, Recorded Investment, Nonaccrual Status		203	[2]	235	[4]
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	298		404
Financing Receivable, Recorded Investment, Nonaccrual Status		11	[2]	12	[4]
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		8,729		7,771
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[2]	6	[4]
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		12,140		10,736
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[2]	1	[4]
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,582		1,410
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[4]
Pass | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		64,546		66,961
Pass | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		5,126		4,574
Pass | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		3,770		3,914
Criticized Accruing | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,595		1,862
Criticized Accruing | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		167		415
Criticized Accruing | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		33		84
FICO Score 700 and Above [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	23,602		22,194
FICO Score 700 and Above [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	8,946		9,826
FICO Score 700 and Above [Member] | Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	240		292
FICO Score 700 and Above [Member] | Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		7,929		7,008
FICO Score 700 and Above [Member] | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		9,094		7,642
FICO Score 700 and Above [Member] | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,088		974
FICO Score Between 620 and 699 | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	2,721		3,042
FICO Score Between 620 and 699 | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	1,242		1,540
FICO Score Between 620 and 699 | Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6]	50		96
FICO Score Between 620 and 699 | Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		757		703
FICO Score Between 620 and 699 | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		2,344		2,381
FICO Score Between 620 and 699 | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		395		351
FICO Score Below 620 | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6],[10]	813		901
FICO Score Below 620 | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6],[10]	438		546
FICO Score Below 620 | Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[6],[10]	8		16
FICO Score Below 620 | Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[10]	43		60
FICO Score Below 620 | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[10]	702		713
FICO Score Below 620 | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	[10]	$ 99		$ 85
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Nonaccruing loans past due 90 days or more totaled $357 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[3]	Nonaccruing restructured loans are included in total nonaccrual loans/NPLs.
[4]	Nonaccruing loans past due 90 days or more totaled $360 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[5]	Includes $3.7 billion of lease financing at both December 31, 2017 and 2016, and $778 million and $729 million of installment loans at December 31, 2017 and 2016, respectively.
[6]	Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016, respectively, for which there was nominal risk of principal loss due to the government guarantee.
[7]	Includes $196 million and $222 million of LHFI measured at fair value at December 31, 2017 and 2016, respectively.
[8]	Includes $196 million of loans measured at fair value, the majority of which were accruing current.
[9]	Includes $222 million of loans measured at fair value, the majority of which were accruing current.
[10]	For substantially all loans with refreshed FICO scores below 620, the borrower’s FICO score at the time of origination exceeded 620 but has since deteriorated as the loan has seasoned.

LHFI by Credit Quality Indica81

LHFI by Credit Quality Indicator (Additional Information) (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	[1]	$ 143,181	$ 143,298
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		560	537
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross		$ 6,633	$ 6,167
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.

Payment Status for the LHFI Por

Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 139,956		$ 140,130
Accruing 30-89 Days Past Due		1,146		1,035
Accruing 90+ Days Past Due		1,405		1,288
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	674	[1]	845	[3]
Total	[4]	143,181		143,298
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		66,092		68,776
Accruing 30-89 Days Past Due		42		35
Accruing 90+ Days Past Due		7		12
Financing Receivable, Recorded Investment, Nonaccrual Status		215	[1]	390	[3]
Total	[5]	66,356		69,213
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,293		4,988
Accruing 30-89 Days Past Due		0		1
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		24	[1]	7	[3]
Total		5,317		4,996
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,803		3,998
Accruing 30-89 Days Past Due		0		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		1	[1]	17	[3]
Total		3,804		4,015
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		75,188		77,762
Accruing 30-89 Days Past Due		42		36
Accruing 90+ Days Past Due		7		12
Financing Receivable, Recorded Investment, Nonaccrual Status		240	[1]	414	[3]
Total		75,477		78,224
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		159		155
Accruing 30-89 Days Past Due		55		55
Accruing 90+ Days Past Due		346		327
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		560		537
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		26,778	[6]	25,869	[7]
Accruing 30-89 Days Past Due		148	[6]	84	[7]
Accruing 90+ Days Past Due		4	[6]	7	[7]
Financing Receivable, Recorded Investment, Nonaccrual Status		206	[1],[6]	177	[3],[7]
Total	[8],[9]	27,136	[6]	26,137	[7]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,348		11,596
Accruing 30-89 Days Past Due		75		81
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		203	[1]	235	[3]
Total	[8]	10,626		11,912
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		280		389
Accruing 30-89 Days Past Due		7		3
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		11	[1]	12	[3]
Total	[8]	298		404
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,946		4,637
Accruing 30-89 Days Past Due		659		603
Accruing 90+ Days Past Due		1,028		927
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		6,633		6,167
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		8,679		7,726
Accruing 30-89 Days Past Due		36		35
Accruing 90+ Days Past Due		7		4
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[1]	6	[3]
Total		8,729		7,771
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		12,022		10,608
Accruing 30-89 Days Past Due		111		126
Accruing 90+ Days Past Due		0		1
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[1]	1	[3]
Total		12,140		10,736
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,556		1,388
Accruing 30-89 Days Past Due		13		12
Accruing 90+ Days Past Due		13		10
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		1,582		1,410
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		64,768		62,368
Accruing 30-89 Days Past Due		1,104		999
Accruing 90+ Days Past Due		1,398		1,276
Financing Receivable, Recorded Investment, Nonaccrual Status		434	[1]	431	[3]
Total		$ 67,704		$ 65,074
[1]	Nonaccruing loans past due 90 days or more totaled $357 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[2]	Nonaccruing restructured loans are included in total nonaccrual loans/NPLs.
[3]	Nonaccruing loans past due 90 days or more totaled $360 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[4]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.
[5]	Includes $3.7 billion of lease financing at both December 31, 2017 and 2016, and $778 million and $729 million of installment loans at December 31, 2017 and 2016, respectively.
[6]	Includes $196 million of loans measured at fair value, the majority of which were accruing current.
[7]	Includes $222 million of loans measured at fair value, the majority of which were accruing current.
[8]	Excludes $6.6 billion and $6.2 billion of guaranteed student loans and $560 million and $537 million of guaranteed residential mortgages at December 31, 2017 and 2016, respectively, for which there was nominal risk of principal loss due to the government guarantee.
[9]	Includes $196 million and $222 million of LHFI measured at fair value at December 31, 2017 and 2016, respectively.

Payment Status for the LHFI P83

Payment Status for the LHFI Portfolio (Additional Information) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 196	$ 222
Nonaccruing 90 Plus Days Past Due	357	360
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans Receivable, Fair Value Disclosure	$ 196	$ 222

LHFI Considered Impaired (Detai

LHFI Considered Impaired (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		$ 3,046,000,000		$ 3,434,000,000
Impaired Financing Receivable, Recorded Investment	[1]	2,821,000,000		3,068,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		204,000,000		255,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		2,866,000,000		3,045,000,000		$ 2,916,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		125,000,000	[2]	128,000,000	[2]	132,000,000
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		38,000,000		266,000,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[1]	35,000,000		214,000,000
Impaired Financing Receivable, Unpaid Principal Balance		127,000,000		225,000,000
Impaired Financing Receivable, Recorded Investment	[1]	117,000,000		151,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		19,000,000		31,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		34,000,000		169,000,000		58,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		1,000,000	[2]	3,000,000	[2]	2,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		112,000,000		170,000,000		147,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2,000,000	[2]	1,000,000	[2]	5,000,000
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		21,000,000		26,000,000
Impaired Financing Receivable, Recorded Investment	[1]	21,000,000		17,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		2,000,000		2,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		0		0		10,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		22,000,000		25,000,000		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		1,000,000	[2]	1,000,000	[2]	0
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		38,000,000		266,000,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[1]	35,000,000		214,000,000
Impaired Financing Receivable, Unpaid Principal Balance		148,000,000		251,000,000
Impaired Financing Receivable, Recorded Investment	[1]	138,000,000		168,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		21,000,000		33,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		34,000,000		169,000,000		68,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		1,000,000	[2]	3,000,000	[2]	2,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		134,000,000		195,000,000		147,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		3,000,000	[2]	2,000,000	[2]	5,000,000
Residential Nonguaranteed [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		458,000,000		466,000,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[1]	363,000,000		360,000,000
Impaired Financing Receivable, Unpaid Principal Balance		1,133,000,000		1,277,000,000
Impaired Financing Receivable, Recorded Investment	[1]	1,103,000,000		1,248,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		113,000,000		150,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		357,000,000		370,000,000		390,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		15,000,000	[2]	16,000,000	[2]	17,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		1,123,000,000		1,251,000,000		1,349,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		58,000,000	[2]	64,000,000	[2]	65,000,000
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		953,000,000		863,000,000
Impaired Financing Receivable, Recorded Investment	[1]	895,000,000		795,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		54,000,000		54,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		914,000,000		812,000,000		682,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		32,000,000	[2]	29,000,000	[2]	28,000,000
Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		15,000,000		16,000,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[1]	9,000,000		8,000,000
Impaired Financing Receivable, Unpaid Principal Balance		93,000,000		109,000,000
Impaired Financing Receivable, Recorded Investment	[1]	90,000,000		107,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		7,000,000		11,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		8,000,000		8,000,000		11,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0	[2]	0	[2]	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		94,000,000		110,000,000		125,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		5,000,000	[2]	6,000,000	[2]	8,000,000
Consumer Other Direct [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		59,000,000		59,000,000	[3]
Impaired Financing Receivable, Recorded Investment	[1]	59,000,000		59,000,000	[3]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,000,000		1,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		60,000,000		10,000,000		12,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		4,000,000	[2]	1,000,000	[2]	0
Consumer Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		123,000,000		103,000,000
Impaired Financing Receivable, Recorded Investment	[1]	122,000,000		103,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		7,000,000		5,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		136,000,000		114,000,000		125,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		6,000,000	[2]	6,000,000	[2]	6,000,000
Credit Card Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		26,000,000		24,000,000
Impaired Financing Receivable, Recorded Investment	[1]	7,000,000		6,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,000,000		1,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		6,000,000		6,000,000		7,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		1,000,000	[2]	1,000,000	[2]	1,000,000
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		473,000,000		482,000,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[1]	372,000,000		368,000,000
Impaired Financing Receivable, Unpaid Principal Balance		2,387,000,000		2,435,000,000
Impaired Financing Receivable, Recorded Investment	[1]	2,276,000,000		2,318,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		183,000,000		222,000,000
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		365,000,000		378,000,000		401,000,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		15,000,000	[2]	16,000,000	[2]	17,000,000
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		2,333,000,000		2,303,000,000		2,300,000,000
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		$ 106,000,000	[2]	$ 107,000,000	[2]	$ 108,000,000
[1]	Carrying value reflects charge-offs that have been recognized plus other amounts that have been applied to adjust the net book balance.
[2]	Of the interest income recognized during the years ended December 31, 2017, 2016, and 2015, cash basis interest income was $4 million, $4 million, and $7 million, respectively.
[3]	Includes $41 million of TDRs that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016.

LHFI Considered Impaired (Addit

LHFI Considered Impaired (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 373	[1]	$ 482	[2]	$ 350	[3]
Impaired Financing Receivable, Interest Income, Cash Basis Method	4		4		7
Accrual Loans [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 2,400		$ 2,500
Percentage Of Accruing Troubled Debt Restructurings, Current	96.00%		97.00%
Consumer Other Direct [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 9	[1]	$ 50	[2],[4]	$ 1	[3]
Consumer Other Direct [Member] | Loans Modified Prior to 2016 [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 41
[1]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[2]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[3]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[4]	Includes 3,321 loans with a carrying value of $41 million that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016.

Nonperforming Assets (Detail)

Nonperforming Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	$ 674	[1]	$ 845	[3]
OREO	[4]	57		60
Other repossessed assets		10		14
Total nonperforming assets		741		919
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		215	[1]	390	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		24	[1]	7	[3]
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		1	[1]	17	[3]
Residential Nonguaranteed [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		206	[1],[5]	177	[3],[6]
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		203	[1]	235	[3]
Residential Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		11	[1]	12	[3]
Consumer Other Direct [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[1]	6	[3]
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 7	[1]	$ 1	[3]
[1]	Nonaccruing loans past due 90 days or more totaled $357 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[2]	Nonaccruing restructured loans are included in total nonaccrual loans/NPLs.
[3]	Nonaccruing loans past due 90 days or more totaled $360 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.
[4]	Does not include foreclosed real estate related to loans insured by the FHA or guaranteed by the VA. Proceeds due from the FHA and the VA are recorded as a receivable in Other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA and the VA totaled $45 million and $50 million at December 31, 2017 and 2016, respectively.
[5]	Includes $196 million of loans measured at fair value, the majority of which were accruing current.
[6]	Includes $222 million of loans measured at fair value, the majority of which were accruing current.

Nonperforming Assets (Additiona

Nonperforming Assets (Additional Information) (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Other Real Estate	[1]	$ 57	$ 60
Accrual Loans [Member]
Mortgage Loans in Process of Foreclosure, Amount		101	122
Proceeds due from FHA or VA [Member]
Mortgage Loans in Process of Foreclosure, Amount		97	114
Other Real Estate		45	50
Nonaccrual loans [Member]
Mortgage Loans in Process of Foreclosure, Amount		73	85
Residential Portfolio Segment [Member]
Other Real Estate		51	50
Commercial Portfolio Segment [Member]
Other Real Estate		4	7
Land and Land Improvements [Member]
Other Real Estate		$ 2	$ 3
[1]	Does not include foreclosed real estate related to loans insured by the FHA or guaranteed by the VA. Proceeds due from the FHA and the VA are recorded as a receivable in Other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA and the VA totaled $45 million and $50 million at December 31, 2017 and 2016, respectively.

Loans TDR Modifications (Detail

Loans TDR Modifications (Details) $ in Millions		12 Months Ended
		Dec. 31, 2017USD ($)contracts	[1]	Dec. 31, 2016USD ($)contracts		Dec. 31, 2015USD ($)contracts
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		7,136		9,278	[2]	5,599	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 74		$ 93	[2]	$ 157	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		299		389	[2]	193	[3]
Financing Receivable, Amount Restructured During Period		$ 373		$ 482	[2]	$ 350	[3]
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		178		84	[2]	57	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 3		$ 2	[2]	$ 1	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		43		68	[2]	3	[3]
Financing Receivable, Amount Restructured During Period		$ 46		$ 70	[2]	$ 4	[3]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts	[3]					2
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	[3]					$ 0
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	[3]					0
Financing Receivable, Amount Restructured During Period	[3]					$ 0
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts				1	[2]	1	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted				$ 0	[2]	$ 0	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted				0	[2]	0	[3]
Financing Receivable, Amount Restructured During Period				$ 0	[2]	$ 0	[3]
Residential Nonguaranteed [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		150		397	[2]	737	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 22		$ 79	[2]	$ 125	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		10		12	[2]	34	[3]
Financing Receivable, Amount Restructured During Period		$ 32		$ 91	[2]	$ 159	[3]
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		2,488		2,611	[2]	1,888	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 45		$ 9	[2]	$ 24	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		176		227	[2]	108	[3]
Financing Receivable, Amount Restructured During Period		$ 221		$ 236	[2]	$ 132	[3]
Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts				1	[2]	4	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted				$ 0	[2]	$ 5	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted				0	[2]	0	[3]
Financing Receivable, Amount Restructured During Period				$ 0	[2]	$ 5	[3]
Consumer Other Direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		661		3,925	[2],[4]	54	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 0		$ 0	[2],[4]	$ 0	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		9		50	[2],[4]	1	[3]
Financing Receivable, Amount Restructured During Period		$ 9		$ 50	[2],[4]	$ 1	[3]
Consumer Indirect [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		2,740		1,539	[2]	2,299	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 0		$ 0	[2]	$ 0	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		61		32	[2]	47	[3]
Financing Receivable, Amount Restructured During Period		$ 61		$ 32	[2]	$ 47	[3]
Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts		919		720	[2]	557	[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted		$ 4		$ 3	[2]	$ 2	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted		0		0	[2]	0	[3]
Financing Receivable, Amount Restructured During Period		$ 4		$ 3	[2]	$ 2	[3]
Loans Modified Prior to 2016 [Member] | Consumer Other Direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts | contracts				3,321
Financing Receivable, Amount Restructured During Period				$ 41
[1]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[2]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[3]	Includes loans modified under the terms of a TDR that were charged-off during the period.
[4]	Includes 3,321 loans with a carrying value of $41 million that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016.

Loans Mortgages With Potential

Loans Mortgages With Potential Concentration of Credit Risk (Details) $ in Millions	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current Weighted Average FICO Score on Mortgages With Potential Concentration of Credit Risk	756	751
Fair Value, Concentration of Risk, Loans Receivable	$ 10,843	$ 10,322
Residential Mortgage Interest Only Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value, Concentration of Risk, Loans Receivable	646	1,124
Residential Mortgage Interest Only Loans [Member] | Mortgages With Mortgage Insurance or With LTV Ratio Less Than or Equal to 80% [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value, Concentration of Risk, Loans Receivable	569	845
Residential Mortgage Interest Only Loans [Member] | Mortgages With No Mortgage Insurance and With LTV Ratio Greater Than 80% [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value, Concentration of Risk, Loans Receivable	77	279
Residential Mortgage Amortizing Loans [Member] | Mortgages With LTV Ratio Greater Than 80% and/or second liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value, Concentration of Risk, Loans Receivable	$ 10,197	$ 9,198

Activity in the Allowance for C

Activity in the Allowance for Credit Losses (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components:
Allowance for credit losses		$ 1,814		$ 1,776	$ 1,815	$ 1,991
Provision for loan losses		397		440	156
Provision for Other Credit Losses		12		4	9
Allowance for Loan and Lease Losses, Write-offs		(491)		(591)	(470)
Loan recoveries		124		108	129
Allowance for Loan and Lease Losses, Period Increase (Decrease)		(4)	[1]	0	0
Loans and Leases Receivable, Allowance		1,735		1,709	1,752
Unfunded commitments reserve	[2]	$ 79		$ 67	$ 63
[1]	Related to loans disposed in connection with the sale of PAC. For additional information regarding the sale of PAC, see Note 2, "Acquisitions/Dispositions."
[2]	The unfunded commitments reserve is recorded in Other liabilities in the Consolidated Balance Sheets.

Activity in the ALLL by segment

Activity in the ALLL by segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses		$ 397		$ 440	$ 156
Allowance for Loan and Lease Losses, Write-offs		(491)		(591)	(470)
Loan recoveries		124		108	129
Allowance for Loan and Lease Losses, Period Increase (Decrease)		(4)	[1]	0	0
Loans and Leases Receivable, Allowance		1,735		1,709	1,752
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses		108		329
Allowance for Loan and Lease Losses, Write-offs		(167)		(287)
Loan recoveries		40		35
Allowance for Loan and Lease Losses, Period Increase (Decrease)	[1],[2]	(4)
Loans and Leases Receivable, Allowance		1,101		1,124	1,047
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses		289		111
Allowance for Loan and Lease Losses, Write-offs		(324)		(304)
Loan recoveries		84		73
Allowance for Loan and Lease Losses, Period Increase (Decrease)		0
Loans and Leases Receivable, Allowance		$ 634		$ 585	$ 705
[1]	Related to loans disposed in connection with the sale of PAC. For additional information regarding the sale of PAC, see Note 2, "Acquisitions/Dispositions."
[2]	Related to loans disposed in connection with the sale of PAC. For additional information regarding the sale of PAC, see Note 2, "Acquisitions/Dispositions."

Loans Held for Investment portf

Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Individually evaluated		$ 2,821	$ 3,068
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		204	255
Collectively evaluated		140,164	140,008
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,531	1,454
Total evaluated		142,985	143,076
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans		1,735	1,709
Loans Receivable, Fair Value Disclosure		196	222
Total	[1]	143,181	143,298
Loans and Leases Receivable, Allowance		1,735	1,709	$ 1,752
Commercial Portfolio Segment [Member]
Individually evaluated		173	382
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		21	33
Collectively evaluated		75,304	77,842
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,080	1,091
Total evaluated		75,477	78,224
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans		1,101	1,124
Loans Receivable, Fair Value Disclosure		0	0
Total		75,477	78,224
Loans and Leases Receivable, Allowance		1,101	1,124	1,047
Residential Portfolio Segment [Member]
Total		38,620	38,990
Consumer Portfolio Segment [Member]
Individually evaluated		2,648	2,686
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		183	222
Collectively evaluated		64,860	62,166
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		451	363
Total evaluated		67,508	64,852
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans		634	585
Loans Receivable, Fair Value Disclosure		196	222
Total		67,704	65,074
Loans and Leases Receivable, Allowance		$ 634	$ 585	$ 705
[1]	Includes loans of consolidated VIEs of $179 million and $211 million at December 31, 2017 and December 31, 2016, respectively.

Premises and Equipment (Detail)

Premises and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land	$ 321	$ 320
Buildings and Improvements, Gross	1,047	1,028
Leasehold improvements	691	645
Furniture and equipment	1,430	1,492
Construction in progress	488	357
Property, Plant and Equipment, Gross, Total	3,977	3,842
Less accumulated depreciation and amortization	2,243	2,286
Premises and equipment	$ 1,734	$ 1,556
Building and Building Improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year	1 year
Building and Building Improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years	40 years
Leasehold Improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year	1 year
Leasehold Improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years	30 years
Furniture and Fixtures | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year	1 year
Furniture and Fixtures | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years	20 years

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Operating Leases, Rent Expense, Net	$ 201	$ 202	$ 200
Depreciation, Depletion and Amortization	175	179	175
Amortization Of Deferred Gain On Sale Lease Back Of Premises	17	43	$ 54
Sale Leaseback Transaction, Deferred Gain, Gross	$ 49	$ 67

Premises and Equipment Leases (

Premises and Equipment Leases (Details) $ in Millions	Dec. 31, 2017USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 205
Operating Leases, Future Minimum Payments, Due in Two Years	199
Operating Leases, Future Minimum Payments, Due in Three Years	179
Operating Leases, Future Minimum Payments, Due in Four Years	167
Operating Leases, Future Minimum Payments, Due in Five Years	151
Operating Leases, Future Minimum Payments, Due Thereafter	657
Operating Leases, Future Minimum Payments Due	$ 1,558

Goodwill and Intangible Assets

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 15, 2016
Bank Servicing Fees		$ 191	$ 189	$ 169
Principal Amount Outstanding of Loans Serviced		30,100	27,700
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		285,301	278,197
Mortgage Servicing Rights, Fair Value [Member]
Bank Servicing Fees		403	366	347
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		165,500	160,200
Principal Amount Outstanding of Loans Serviced For Third Parties		136,100	129,600
Unpaid Principal Balance of Outstanding Underlying MSRs Purchased		0	19,700
Principal Amount Sold on Loans Serviced for Third Parties		1,100	575
Servicing Asset at Fair Value, Amount		1,710	1,572	1,307
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	139,920	131,914
Commercial Mortgage Servicing Rights [Member]
Servicing Asset at Amortized Cost		65	62
Bank Servicing Fees		22	0	0
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		5,800	4,800
Servicing Asset at Fair Value, Amount		75	62
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets					$ 62
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	134,160	127,153
Pillar Financial [Member]
Bank Servicing Fees		14	0	$ 0
Principal Amount Outstanding of Loans Serviced For Third Parties		$ 24,300	$ 22,900
[1]	Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments).

Goodwill and Other Intangible97

Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 6,331	$ 6,337
Goodwill, Purchase Accounting Adjustments	1
Goodwill, Written off Related to Sale of Business Unit	(7)
Consumer [Member]
Goodwill [Line Items]
Goodwill	4,262	4,262
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Written off Related to Sale of Business Unit	0
Wholesale [Member]
Goodwill [Line Items]
Goodwill	2,069	$ 2,075
Goodwill, Purchase Accounting Adjustments	1
Goodwill, Written off Related to Sale of Business Unit	$ (7)

Goodwill and Other Intangible98

Goodwill and Other Intangible Assets - Changes in the Carrying Amounts of Other Intangible Assets (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		$ 285,301		$ 278,197
Finite-Lived Intangible Assets, Accumulated Amortization	[1]	(42)		(22)
Finite-Lived Intangible Assets, Net	[2]	69
Intangible Assets, Net (Excluding Goodwill)		1,791	[1]	1,657	[1]	$ 1,325
Amortization	[3]	(20)		(9)
Origination of Mortgage Servicing Rights (MSRs)		411		312
Servicing Assets at Fair Value, Purchased				200
Due to changes in inputs or assumptions	[4]	(22)		(13)
Servicing Asset at Fair Value, Other Changes in Fair Value	[5]	(226)		(232)
Servicing Asset at Fair Value, Disposals		(8)		(2)
Finite-Lived Intangible Assets, Purchase Accounting Adjustments	[6]	(1)
Indefinite-Lived Intangible Assets (Excluding Goodwill)		12		10
Intangible Assets, Gross (Excluding Goodwill)	[1]	1,833		1,679
Mortgage Servicing Rights, Fair Value [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		165,500		160,200
Servicing Asset at Fair Value, Amount		1,710		1,572		1,307
Amortization	[3]	0		0
Origination of Mortgage Servicing Rights (MSRs)		394		312
Servicing Assets at Fair Value, Purchased				200
Due to changes in inputs or assumptions	[4]	(22)		(13)
Servicing Asset at Fair Value, Other Changes in Fair Value	[5]	(226)		(232)
Servicing Asset at Fair Value, Disposals		(8)		(2)
Servicing Asset at Fair Value, Other Changes that Affect Balance		0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	[1]	32		35
Finite-Lived Intangible Assets, Accumulated Amortization	[1]	(28)		(22)
Finite-Lived Intangible Assets, Net	[1]	4		13
Intangible Assets, Net (Excluding Goodwill)		81		85		$ 18
Amortization	[3]	(20)		(9)
Servicing Assets at Fair Value, Purchased				0
Finite-lived Intangible Assets Acquired	[7]			14
Due to changes in inputs or assumptions	[4]	0		0
Servicing Asset at Fair Value, Other Changes in Fair Value	[5]	0		0
Servicing Asset at Fair Value, Disposals		0		0
Finite-Lived Intangible Assets, Purchase Accounting Adjustments	[6]	(1)
Commercial Mortgage Servicing Rights [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		5,800		4,800
Finite-Lived Intangible Assets, Gross	[1]	79		62
Finite-Lived Intangible Assets, Accumulated Amortization	[1]	(14)		0
Finite-Lived Intangible Assets, Net	[1]	65		62
Servicing Asset at Fair Value, Amount		75		62
Origination of Mortgage Servicing Rights (MSRs)		17		0
Servicing Asset at Amortized Cost, Additions				62
Fair Value, Measurements, Recurring [Member]
Servicing Asset at Fair Value, Amount		$ 1,710		$ 1,572
[1]	Excludes fully amortized other intangible assets.
[2]	Does not include indefinite-lived intangible assets of $12 million.
[3]	Does not include expense associated with non-qualified community development investments. See Note 10, "Certain Transfers of Financial Assets and Variable Interest Entities," for additional information.
[4]	Primarily reflects changes in option adjusted spreads and prepayment speed assumptions, due to changes in interest rates.
[5]	Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time.
[6]	Represents the first quarter of 2017 measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition.
[7]	The majority of other intangible assets acquired from Pillar relate to indefinite-lived agency licenses.

Goodwill and Other Intangible99

Goodwill and Other Intangible Assets Intangible Assets Schedule of Future Amortization (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 12	$ 10
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		13
Finite-Lived Intangible Assets, Amortization Expense, Year Two		10
Finite-Lived Intangible Assets, Amortization Expense, Year Three		9
Finite-Lived Intangible Assets, Amortization Expense, Year Four		8
Finite-Lived Intangible Assets, Amortization Expense, Year Five		6
Finite-Lived Intangible Assets, Amortization Expense, after Year Five		23
Finite-Lived Intangible Assets, Net	[1]	69
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	[2]	$ 4	$ 13
[1]	Does not include indefinite-lived intangible assets of $12 million.
[2]	Excludes fully amortized other intangible assets.

Goodwill and Other Intangibl100

Goodwill and Other Intangible Assets - Summary of the Key Characteristics, Inputs, and Economic Assumptions Used to Estimate the Fair Value of the Company's MSRs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Servicing Rights, Fair Value [Member]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	13.00%	9.00%
Decline in fair value from 10% adverse change	$ 85	$ 50
Decline in fair value from 20% adverse change	$ 160	$ 97
Discount rate (annual)	4.00%	8.00%
Decline in fair value from 10% adverse change	$ 47	$ 63
Decline in fair value from 20% adverse change	$ 90	$ 122
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life	5 years 5 months	7 years
Weighted-average coupon	3.90%	4.00%
Commercial Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount	$ 75	$ 62
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	12.00%	12.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	7.00%	6.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions used to Estimate Fair Value, Float Earnings Rate	1.10%	0.50%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life	7 years	7 years
Mortgage Servicing Rights, Fair Value [Member]
Servicing Asset at Fair Value, Amount	$ 1,710	$ 1,572	$ 1,307

Certain Transfers of Financi101

Certain Transfers of Financial Assets and Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other		$ 11	$ 12	$ 19
Assets		205,962	204,875
Total liabilities		180,808	181,257
Long-term Debt	[1],[2]	9,785	11,748
Derivative Asset, Notional Amount		143,238	127,456
Trading Securities	[3]	5,093	6,067
Other Assets		8,949	6,405
Affordable Housing Tax Credits and Other Tax Benefits, Amount		108	92	68
Amortization Method Qualified Affordable Housing Project Investments, Amortization		109	87	66
Amortization of Intangible Assets	[4]	20	9
Amortization		75	49	40
Variable Interest Entity, Not Primary Beneficiary [Member] | Community Development Investments [Member]
Investment Tax Credit		90	64	53
Amortization of Intangible Assets		70	46	35
Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt		189	222
Residential Mortgage [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net		213	331	$ 232
Transferor's Interests in Transferred Financial Assets, Fair Value		22	30
Assets		147	203
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		22	30
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net		37
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Loans Receivable, Net		192	225
Long-term Debt		$ 189	$ 222
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]
Government Guarantee Percent		98.00%	98.00%
Total Return Swap [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Derivative Asset, Notional Amount		$ 1,700	$ 2,100
Trading Securities		1,700	2,100
Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Assets		2,300	1,700
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		643	562
Real Estate Variable Interest Entity Borrowings		278	200
Limited Partner [Member] | Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Other Assets		1,053	780
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		1,391	1,076
Loans Issued by the Company to the Limited Partnerships		$ 350	$ 306
Death, Disability, Bankruptcy [Member] | Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]
Government Guarantee Percent		100.00%
[1]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[2]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[3]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[4]	Does not include expense associated with non-qualified community development investments. See Note 10, "Certain Transfers of Financial Assets and Variable Interest Entities," for additional information.

Borrowings and Contractual C102

Borrowings and Contractual Commitments Short-Term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Federal Funds Purchased	$ 2,561	$ 2,116
Other Short-term Borrowings	717	1,015
Securities Sold under Agreements to Repurchase	1,503	1,633
Short-term Debt	$ 4,781	$ 4,764
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.33%	0.55%
Other Liabilities [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.00%	0.56%
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.39%	0.55%

Portfolio Balances and Delinque

Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		$ 285,301	$ 278,197
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,590	2,686
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		375	494
Commercial Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		75,477	78,224
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		247	426
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		127	252
Consumer Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		67,704	65,074
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		1,832	1,707
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		240	231
Loans and Finance Receivables [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		143,181	143,298
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,079	2,133
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		367	483
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	139,920	131,914
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	171	115
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		8	11
Loans [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	2,200	2,985
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	340	438
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		0	0
Commercial Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[3]	5,760	4,761
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[3]	0	0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		0	0
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	134,160	127,153
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	171	115
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[4]	$ 8	$ 11
[1]	Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments).
[2]	Comprised of unsecuritized loans the Company originated and sold to private investors with servicing rights retained. Net charge-offs on these loans are not presented in the table as the data is not reported to the Company by the private investors that own these related loans.
[3]	Comprised of commercial mortgages sold through Fannie Mae, Freddie Mac, and Ginnie Mae securitizations, whereby servicing has been retained by the Company.
[4]	Amounts associated with $602 million and $922 million of managed securitized loans at December 31, 2017 and 2016, respectively. Net charge-off data is not reported to the Company for the remaining balance of $133.6 billion and $126.2 billion of managed securitized loans at December 31, 2017 and 2016, respectively.

Borrowings and Contractual C104

Borrowings and Contractual Commitments Long-term debt (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt	[1],[2]	$ 9,785	$ 11,748
Parent Company [Member]
Debt Instrument [Line Items]
Long-term Debt		4,466	4,950
Debt Issuance Costs, Net		8	9
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		874
Long-term Debt, Maturities, Repayments of Principal in Year Two		792
Long-term Debt, Maturities, Repayments of Principal in Year Three		0
Long-term Debt, Maturities, Repayments of Principal in Year Four		965
Long-term Debt, Maturities, Repayments of Principal in Year Five		990
Long-term Debt, Maturities, Repayments of Principal after Year Five		853
Long term debt before debt issuance costs		4,474	4,959
Parent Company [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount		3,379	3,818
Long-term Debt, Percentage Bearing Variable Interest, Amount		267	314
Parent Company [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount		200	200
Parent Company [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Amount		$ 628	627
Parent Company [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Nov. 1, 2018
Debt Instrument, Maturity Date Range, End		Jan. 15, 2028
Parent Company [Member] | Fixed Interest Rate Debt [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Feb. 15, 2026
Debt Instrument, Maturity Date Range, End		Feb. 15, 2026
Parent Company [Member] | Variable Rate Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Apr. 30, 2018
Debt Instrument, Maturity Date Range, End		Aug. 1, 2019
Parent Company [Member] | Variable Rate Debt [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Apr. 1, 2027
Debt Instrument, Maturity Date Range, End		Mar. 15, 2028
Parent Company [Member] | Minimum [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		0.25%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		2.35%
Parent Company [Member] | Minimum [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		6.00%
Parent Company [Member] | Minimum [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.09%
Parent Company [Member] | Maximum [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.53%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		6.00%
Parent Company [Member] | Maximum [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		6.00%
Parent Company [Member] | Maximum [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		2.32%
Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 5,319	6,798
Debt Issuance Costs, Net		8	5
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		361
Long-term Debt, Maturities, Repayments of Principal in Year Two		27
Long-term Debt, Maturities, Repayments of Principal in Year Three		1,508
Long-term Debt, Maturities, Repayments of Principal in Year Four		4
Long-term Debt, Maturities, Repayments of Principal in Year Five		1,022
Long-term Debt, Maturities, Repayments of Principal after Year Five		2,405
Long term debt before debt issuance costs	[3]	5,327	6,803
Subsidiaries [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	[3],[4]	3,609	2,539
Long-term Debt, Percentage Bearing Variable Interest, Amount	[3]	512	2,613
Subsidiaries [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	[3]	$ 1,206	$ 1,651
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Feb. 18, 2018
Debt Instrument, Maturity Date Range, End		Dec. 7, 2057
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Mar. 15, 2018
Debt Instrument, Maturity Date Range, End		May 15, 2026
Subsidiaries [Member] | Variable Rate Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Jan. 3, 2020
Debt Instrument, Maturity Date Range, End		Dec. 19, 2043
Subsidiaries [Member] | Minimum [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.04%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		0.80%
Subsidiaries [Member] | Minimum [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.30%
Subsidiaries [Member] | Maximum [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		1.84%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		9.10%
Subsidiaries [Member] | Maximum [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		7.25%
[1]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[2]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[3]	77% and 88% of total subsidiary debt was issued by the Bank as of December 31, 2017 and 2016, respectively.
[4]	Includes leases and other obligations that do not have a stated interest rate.

Certain Transfers of Financi105

Certain Transfers of Financial Assets and Variable Interest Entities Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (Additional Information) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		$ 285,301	$ 278,197
Asset-backed Securities, Securitized Loans and Receivables [Member]
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	139,920	131,914
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	134,160	127,153
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member] | STI Sponsored Securitizations [Member]
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		602	922
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member] | Managed Securitized Loans [Member]
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		133,558	126,231
Commercial Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Statement [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[2]	$ 5,760	$ 4,761
[1]	Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments).
[2]	Comprised of commercial mortgages sold through Fannie Mae, Freddie Mac, and Ginnie Mae securitizations, whereby servicing has been retained by the Company.

Borrowings and Contractual C106

Borrowings and Contractual Commitments Long-term debt (Additional Information) (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Fair Value				$ 530	$ 963
Percent of Subsidiary Debt held by Bank				77.00%	88.00%
Long-term Debt	[1],[2]			$ 9,785	$ 11,748
Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt				1,500
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt				2,800
Long-term Debt				4	2,754
Subordinated Debt [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt				188
debt denominated in foreign currency [Member]
Debt Instrument [Line Items]
Long-term Debt				0	0
Tier two risk based capital [Member]
Debt Instrument [Line Items]
Long-term Debt Risk Based Capital Treatment				$ 1,600	$ 1,700
Sun Trust Bank [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Senior Long-term Debt			$ 300
Sun Trust Bank [Member] | Fixed Interest Rate Debt [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Senior Long-term Debt		$ 1,000	$ 1,000
[1]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[2]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.

Borrowings and Contractual C107

Borrowings and Contractual Commitments Contractual Commitments (Details) $ in Millions	Dec. 31, 2017USD ($)
Long-term Purchase Commitment [Line Items]
Other Commitment	$ 25,265
Other Commitment, Due in Second Year	9,648
Other Commitment, Due in Third Year	13,773
Other Commitment, Due in Fourth Year	13,380
Other Commitment, Due in Fifth Year	15,879
Other Commitment, Due after Fifth Year	12,066
Other Commitment	90,011
Purchase Obligation, Due in Next Twelve Months	278	[1]
Purchase Obligation, Due in Second Year	260	[1]
Purchase Obligation, Due in Third Year	76	[1]
Purchase Obligation, Due in Fourth Year	50	[1]
Purchase Obligation, Due in Fifth Year	48	[1]
Purchase Obligation, Due after Fifth Year	247	[1]
Purchase Obligation	959	[1]
Qualified Affordable Housing Project Investments, Commitment	690	[2]
consumer and other time [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	4,720	[3],[4]
Time Deposit Maturities, Year Two	2,559	[3],[4]
Time Deposit Maturities, Year Three	1,331	[3],[4]
Time Deposit Maturities, Year Four	617	[3],[4]
Time Deposit Maturities, Year Five	834	[3],[4]
Time Deposit Maturities, after Year Five	2,015	[3],[4]
Time Deposits	12,076	[3],[4]
Brokered Time Deposits [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	105	[3]
Time Deposit Maturities, Year Two	181	[3]
Time Deposit Maturities, Year Three	251	[3]
Time Deposit Maturities, Year Four	194	[3]
Time Deposit Maturities, Year Five	178	[3]
Time Deposit Maturities, after Year Five	76	[3]
Time Deposits	985	[3]
Year Two [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Three [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Four [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Five [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
After Year Five [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	$ 0	[2]
[1]	For legally binding purchase obligations of $5 million or more, amounts include either termination fees under the associated contracts when early termination provisions exist, or the total potential obligation over the full contractual term for noncancelable purchase obligations. Payments made towards the purchase of goods or services under these contracts totaled $395 million, $236 million, and $243 million in 2017, 2016, and 2015, respectively.
[2]	Commitments to fund investments in affordable housing and other partnerships do not have defined funding dates as certain criteria must be met before the Company is obligated to fund. Accordingly, these commitments are considered to be due on demand for presentation purposes. See Note 10, "Certain Transfers of Financial Assets and Variable Interest Entities," in this Form 10-K for additional information.
[3]	Amounts do not include interest.
[4]	The aggregate amount of time deposit accounts in denominations of $250,000 or more was $3.2 billion and $1.7 billion at December 31, 2017 and 2016, respectively.

Borrowings and Contractual C108

Borrowings and Contractual Commitments Contractual Commitments (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long-term Purchase Commitment [Line Items]
Minimum Termination Fee for Contractual Commitments	$ 5
Amount paid during period related to purchase obligations	395	$ 236	$ 243
time deposits $250,000 or more	$ 3,200	$ 1,700

Net Income per common share - A

Net Income per common share - Additonal Information (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1	14

Reconciliation of Net Income to

Reconciliation of Net Income to Net Income Available to Common Shareholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Net Income (Loss) Attributable to Parent		$ 2,273	$ 1,878	[1]	$ 1,933	[2]
Dividends, Preferred Stock, Cash	[3]	(94)	(66)		(64)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic		0	(1)		(6)
Net Income (Loss) Available to Common Stockholders, Basic		$ 2,179	$ 1,811		$ 1,863
Average basic common shares		481,339	498,638		514,844
Weighted Average Number of Shares Outstanding, Diluted		486,954	503,466		520,586
Net income/(loss) per average common share - diluted		$ 4.47	$ 3.60		$ 3.58
Earnings Per Share, Basic		$ 4.53	$ 3.63		$ 3.62
Restricted Stock Units (RSUs) [Member]
Restricted stock		3,000	2,900		2,600
Warrant [Member]
Restricted stock		2,000	1,000		2,000
Employee Stock Option [Member]
Restricted stock		900	1,400		1,500
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	For the year ended December 31, 2017, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, $5,625 per share for Perpetual Preferred Stock Series F, $3,128 per share for Perpetual Preferred Stock Series G, and $669 per share for Perpetual Preferred Stock Series H.For the year ended December 31, 2016, dividends were $4,067 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, and $5,625 per share for Perpetual Preferred Stock Series F.For the year ended December 31, 2015, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, and $5,875 per share for Perpetual Preferred Stock Series E, and $6,219 per share for Perpetual Preferred Stock Series F.

Capital - Additional Informatio

Capital - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Capitalization, Equity [Line Items]
Common Stock, Dividends, Per Share, Cash Paid		$ 0.40	$ 0.26	$ 1.32	$ 1	$ 0.92
Dividends, Common Stock, Cash				$ (634)	$ (498)	$ (475)
Dividends, Preferred Stock, Cash	[1]			$ (94)	(66)	$ (64)
Dividend Per Quarter Threshold Prior To Tenth Anniversay Triggering Execise Of Warrants				$ 0.54
Cash Reserve Deposit Required and Made				$ 1,200	$ 1,300
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Stock Repurchased During Period, Value			$ 480	660
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 660
Stock Repurchased During Period, Shares				11.1
Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				$ 4,056	$ 4,067	$ 4,056
Series B Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				4,056	4,067	4,056
Series E Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				5,875	5,875	5,875
Series F Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				5,625	$ 5,625	$ 6,219
Series G Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				3,128
Series H Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid				$ 669
Parent Company [Member]
Schedule of Capitalization, Equity [Line Items]
Retained Earnings, Unappropriated				$ 2,500	$ 2,500
[1]	For the year ended December 31, 2017, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, $5,625 per share for Perpetual Preferred Stock Series F, $3,128 per share for Perpetual Preferred Stock Series G, and $669 per share for Perpetual Preferred Stock Series H.For the year ended December 31, 2016, dividends were $4,067 per share for both Perpetual Preferred Stock Series A and B, $5,875 per share for Perpetual Preferred Stock Series E, and $5,625 per share for Perpetual Preferred Stock Series F.For the year ended December 31, 2015, dividends were $4,056 per share for both Perpetual Preferred Stock Series A and B, and $5,875 per share for Perpetual Preferred Stock Series E, and $6,219 per share for Perpetual Preferred Stock Series F.

Capital Ratios (Detail)

Capital Ratios (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Common Equity Tier One Capital	$ 17,141	$ 16,953
Common Equity Tier One Capital Ratio	9.74%	9.59%
Tier 1 capital	$ 19,622	$ 18,186
Total capital	$ 23,028	$ 21,685
Tier 1 capital	11.15%	10.28%
Total capital	13.09%	12.26%
Tier One Leverage Capital to Average Assets	9.80%	9.22%
Sun Trust Bank [Member]
Common Equity Tier One Capital	$ 19,474	$ 18,535
Common Equity Tier One Capital Ratio	11.29%	10.71%
Tier 1 capital	$ 19,496	$ 18,573
Total capital	$ 22,132	$ 21,276
Tier 1 capital	11.31%	10.73%
Total capital	12.83%	12.29%
Tier One Leverage Capital to Average Assets	9.97%	9.63%
Minimum [Member]
Common Equity Tier One Capital Ratio	4.50%
Tier 1 capital	6.00%
Total capital	8.00%
Tier One Leverage Capital to Average Assets	4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	2.50%

Capital Preferred Stock (Detail

Capital Preferred Stock (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	25,000	12,000
Preferred Stock, Value, Outstanding	$ 2,475	$ 1,225	$ 1,225
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	1,725
Preferred Stock, Value, Outstanding	$ 172	172	172
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	1,025
Preferred Stock, Value, Outstanding	$ 103	103	103
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	4,500
Preferred Stock, Value, Outstanding	$ 450	450	450
Series F Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	5,000
Preferred Stock, Value, Outstanding	$ 500	$ 500	$ 500
Series G Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	7,500
Preferred Stock, Value, Outstanding	$ 750
Series H Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	5,000
Preferred Stock, Value, Outstanding	$ 500

Capital Preferred Stock (Additi

Capital Preferred Stock (Additional Information) (Details) - USD ($)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2009

Nov. 30, 2017

May 31, 2017

Nov. 30, 2014

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Sep. 22, 2011

Dec. 31, 2008

Dec. 31, 2006

Sep. 30, 2006

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

50,000,000

50,000,000

Stock Issued During Period, Value, New Issues

$ 1,239,000,000

Payments for Repurchase of Warrants

$ 0

$ 24,000,000

$ 0

Class of Warrant or Right, Outstanding

7,100,000

Series A Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

5,000

Preferred Stock, Shares Issued

5,000

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate

0.53%

Declared And Accrued Preferred Stock Dividend Fixed Rate

4.00%

Stock Redeemed or Called During Period, Shares

3,275

Preferred Stock, Redemption Price Per Share

$ 100,000

Series B Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

5,010

Preferred Stock, Shares Issued

1,025

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate

0.65%

Declared And Accrued Preferred Stock Dividend Fixed Rate

4.00%

Preferred Stock, Redemption Price Per Share

$ 100,000

Series C Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Issued

35,000

Series D Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Issued

13,500

Series E Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

5,000

Preferred Stock, Shares Issued

4,500

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Fixed Rate

5.88%

Preferred Stock, Redemption Price Per Share

$ 100,000

Series F Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

5,000

Preferred Stock, Shares Issued

5,000

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate

3.86%

Declared And Accrued Preferred Stock Dividend Fixed Rate

5.63%

Preferred Stock, Redemption Price Per Share

$ 100,000

Series G Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

7,500

Preferred Stock, Shares Issued

7,500

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate

3.10%

Declared And Accrued Preferred Stock Dividend Fixed Rate

5.05%

Series H Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Authorized

5,000

Preferred Stock, Shares Issued

5,000

Preferred Stock, No Par Value

$ 0

Preferred Stock, Liquidation Preference, Value

$ 100,000

Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate

2.79%

Declared And Accrued Preferred Stock Dividend Fixed Rate

5.13%

Preferred Stock, Redemption Price Per Share

$ 100,000

Warrant [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Outstanding

17,900,000

Series A [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

4,000,000

6,000,000

Class of Warrant or Right, Exercise Price of Warrants or Rights

$ 11,000,000

$ 33.70

warrants purchased

1,100,000

Series B [Member]

Class of Stock [Line Items]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

11,900,000

Class of Warrant or Right, Exercise Price of Warrants or Rights

$ 44.15

warrants purchased

5,400,000

Parent Company [Member]

Class of Stock [Line Items]

Payments for Repurchase of Warrants

$ 0

$ 24,000,000

$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Income Taxes Other Information [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%		35.00%		35.00%
Future Corporate Income Tax Rate		21.00%
Deferred Taxes Remeasurement Benefit Related to 2017 Tax Act		$ 333
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	[1]	(117)		$ (86)		$ (69)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		(32)	[2]	(21)	[2]	(17)
Deferred Tax Assets, Valuation Allowance		143	[3]	80	[4]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		112
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		17		8
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		10		(1)
Decrease in Unrecognized Tax Benefits is Reasonably Possible		$ 30
Minimum [Member]
Income Taxes Other Information [Line Items]
Operating Loss Carryforwards, Limitations on Use		2,018
Maximum [Member]
Income Taxes Other Information [Line Items]
Operating Loss Carryforwards, Limitations on Use		2,037
Adjustments for New Accounting Principle, Early Adoption [Member]
Income Taxes Other Information [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ 25		15
Investments [Member]
Income Taxes Other Information [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Amount		$ (43)		$ (2)		$ (6)
[1]	Excludes income tax benefits of $43 million, $2 million, and $6 million for the years ended December 31, 2017, 2016, and 2015, respectively, related to tax credits, which were recognized as a reduction to the related investment asset.
[2]	Includes excess tax benefits of $25 million and $15 million for the years ended December 31, 2017 and 2016, respectively, related to the Company's adoption of ASU 2016-09.
[3]	The Company's DTAs and DTLs for December 31, 2017 were calculated using the enacted federal income rate of 21%.
[4]	The Company's DTAs and DTLs for December 31, 2016 were calculated using the enacted federal income rate of 35%.

Income Taxes Components of Inco

Income Taxes Components of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of income tax provision [Line Items]
Current Federal Tax Expense (Benefit)	$ 129	$ 667	$ 707
Current State and Local Tax Expense (Benefit)	59	27	36
Current Income Tax Expense (Benefit)	188	694	743
Deferred Federal Income Tax Expense (Benefit)	275	59	27
Deferred State and Local Income Tax Expense (Benefit)	69	52	(6)
Deferred Income Tax Expense (Benefit)	344	111	21
Income Tax Expense (Benefit)	$ 532	$ 805	$ 764

Income Taxes Income Tax Rate Re

Income Taxes Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount		$ 982		$ 939		$ 944
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%		35.00%		35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount		$ 66		$ 53		$ 25
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent		2.40%		2.00%		0.90%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount		$ (90)		$ (86)		$ (88)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent		3.20%		3.20%		3.30%
Effective Income Tax Rate Reconciliation, Change in UTBs, Amount		$ 26		$ 6		$ (31)
Effective Income Tax Rate Reconciliation, Change in UTBs, Percent		0.90%		0.20%		(1.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	[1]	$ (117)		$ (86)		$ (69)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	[1]	4.20%		3.20%		2.60%
Effective Income Tax Rate Reconciliation, Deferred Taxes Remeasurement, Amount		$ (303)	[2]	$ 0		$ 0
Effective Income Tax Rate Reconciliation, Deferred Taxes Remeasurement, Percent		(10.80%)	[2]	(0.00%)		(0.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ (32)	[3]	$ (21)	[3]	$ (17)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent		(1.10%)	[3]	(0.80%)	[3]	(0.60%)
Income Tax Expense (Benefit)		$ 532		$ 805		$ 764
Effective Income Tax Rate Reconciliation, Percent		19.00%		30.00%		28.30%
Investments [Member]
Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Amount		$ (43)		$ (2)		$ (6)
Adjustments for New Accounting Principle, Early Adoption [Member]
Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ 25		$ 15
[1]	Excludes income tax benefits of $43 million, $2 million, and $6 million for the years ended December 31, 2017, 2016, and 2015, respectively, related to tax credits, which were recognized as a reduction to the related investment asset.
[2]	Includes reasonable estimates as of December 31, 2017, which could be adjusted as additional analysis is completed in 2018.
[3]	Includes excess tax benefits of $25 million and $15 million for the years ended December 31, 2017 and 2016, respectively, related to the Company's adoption of ASU 2016-09.

Income Taxes Deferred Tax Asset

Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	[1]	Dec. 31, 2016	[2]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 412		$ 639
Deferred Tax Assets, Other Comprehensive Loss	302		472
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	227		170
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	180		343
Deferred Tax Assets, Other	17		19
Deferred Tax Assets, Gross	1,138		1,643
Deferred Tax Assets, Valuation Allowance	(143)		(80)
Deferred Tax Assets, Net	995		1,563
Deferred Tax Liabilities, Leasing Arrangements	459		659
Deferred Tax Liabilities, Servicing Rights	290		370
Deferred Tax Liabilities, Employee Compensation and Benefits	210		179
Deferred Tax Liabilities, Tax Deferred Income	193		22
Deferred Tax Liabilities, Goodwill and Intangible Assets	155		233
Deferred Tax Liabilities, Property, Plant and Equipment	111		113
Deferred Tax Liabilities Loans	104		176
Deferred Tax Liabilities, Other	41		43
Deferred Tax Liabilities, Gross	1,563		1,795
Deferred Tax Liabilities, Net	$ (568)		$ (232)
[1]	The Company's DTAs and DTLs for December 31, 2017 were calculated using the enacted federal income rate of 21%.
[2]	The Company's DTAs and DTLs for December 31, 2016 were calculated using the enacted federal income rate of 35%.

Income Taxes Changes in Unrecog

Income Taxes Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in Unrecognized Tax Benefits [Line Items]
Unrecognized Tax Benefits	$ 141	$ 111	$ 100
Federal and State [Member]
Changes in Unrecognized Tax Benefits [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	22	18
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(5)	(4)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	13	13
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 0	$ (16)

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 22, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		16			17
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 75	$ 65
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years
Performance Stock Units, Grants in Period		1	2	1
Performance Stock Unit, Unrecognized Compensation Expense		$ 56
Personal Pension Account Interest Crediting Rate		3.11%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year		8.25%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate		8 years
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		4.50%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation		$ 1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation		1
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components		1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components		1
Defined Benefit Plan, Effect of 25 Basis Point Change in Expected Long-Term Return on Plan Assets		8
Defined Benefit Plan, Effect of 25 Basis Point Change in the Discount Rate		$ 1
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		6.00%	6.00%	6.00%
Defined Contribution Plan, Cost		$ 130	$ 105	$ 121
Restricted Stock Unit Expense		83	56	46
Performance Stock Units Expense	[1]	77	67	32
Restricted Stock or Unit Expense		0	2	16
Stock or Unit Option Plan Expense		0	0	1
Share-based Compensation		160	125	95
Pension Plan [Member]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year		$ 23
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate		5.90%
Defined Benefit Plan, Plan Assets, Contributions by Employer	[2]	$ 9	5
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year		$ 7
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate		3.10%
Defined Benefit Plan, Plan Assets, Contributions by Employer	[3]	$ 0	0
Long-term [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense		319	291	245
Short-term [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense		$ 476	$ 469	$ 448
[1]	Phantom stock units are settled in cash. The Company paid $80 million, $28 million, and $16 million during the years ended December 31, 2017, 2016, and 2015, respectively, related to these share-based liabilities.
[2]	Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets.
[3]	The Company contributed less than $1 million to the other postretirement benefits plans during both 2017 and 2016.

Summary of Stock Option and Res

Summary of Stock Option and Restricted Stock Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock Options Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,659,305	3,253,793
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(830,383)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(764,105)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	1,659,305
Stock Options Price Range
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 9.06	$ 9.06
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	64.58	85.34
Share Based Compensation Shares Authorized Under Stock Option Plans, Grants in Period Exercise Price Range Lower Range Limit	0
Share Based Compensation Shares Authorized Under Stock Option Plans, Grants in Period Exercise Price Range Upper Range Limit	0
Share Based Compensation Shares Authorized Under Stock Option Plans, Exercised in Period Exercise Price Range Lower Range Limit	9.06
Share Based Compensation Shares Authorized Under Stock Option Plans, Exercised in Period Exercise Price Range Upper Range Limit	64.58
Share Based Compensation Shares Authorized Under Stock Option Plans, Forfeitures and Expirations in Period Exercise Price Range Lower Range Limit	56.34
Share Based Compensation Shares Authorized Under Stock Option Plans, Forfeitures and Expirations in Period Exercise Price Range Upper Range Limit	85.34
Stock Options Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	35.33	$ 42.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	25.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	81.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 35.33
Restricted Stock [Member]
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	8,744	11,312
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	8,744
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period	(11,312)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Restricted Stock Deferred Compensation
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 1	$ 0
Deferred Compensation Arrangement, Grants in Period	1
Deferred Compensation Arrangement, Exercised in Period	0
Deferred Compensation Arrangement, Forfeitures and Expirations in Period	$ 0
Restricted Stock Weighted Average Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 57.19	$ 42.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	57.19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Grant Date Fair Value	42.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Restricted Stock Units (RSUs) [Member]
Restricted Stock Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	4,153,719	4,175,809
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,901,144
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period	(1,703,795)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(219,439)
Restricted Stock Weighted Average Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 44.68	$ 36.27
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	59.95
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Grant Date Fair Value	36.62
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 44.32
Range 1 [Member]
Stock Options Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,170,605
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	1,170,605
Stock Options Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 23.12
Range 2 [Member]
Stock Options Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	488,700
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	488,700
Stock Options Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 64.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 64.58

Stock Options by Ranges of Exer

Stock Options by Ranges of Exercise Price (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,659,305	3,253,793
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 48,550
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	1,659,305
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 35.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 48,550
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 5 months
Range 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,170,605
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 48,545
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	1,170,605
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 23.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 48,545
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 5 months
Range 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	488,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	488,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 64.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 month

Intrinsic and Fair Value of Sto

Intrinsic and Fair Value of Stock-based Compensation (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	[1]	$ 28	$ 43	$ 15
Share-based Compensation Arrangement by Share-based Payment Award, RSUs, Vested in Period, Fair Value	[1]	62	74	23
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	[1]	$ 0	$ 41	$ 35
[1]	Measured as of the grant date.

Stock-Based Compensation Expens

Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Unit Expense		$ 83	$ 56	$ 46
Performance Stock Units Expense	[1]	77	67	32
Restricted Stock or Unit Expense		0	2	16
Stock or Unit Option Plan Expense		0	0	1
Share-based Compensation		160	125	95
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	[2]	$ 61	$ 48	$ 36
[1]	Phantom stock units are settled in cash. The Company paid $80 million, $28 million, and $16 million during the years ended December 31, 2017, 2016, and 2015, respectively, related to these share-based liabilities.
[2]	Does not include excess tax benefits or deficiencies recognized in the Provision for income taxes in the Consolidated Statements of Income.

Employee Benefit Plans Stock-Ba

Employee Benefit Plans Stock-Based Compensation Expense Recognized in Noninterest Expense (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Performance Stock Units, Cash Distributions	$ 80	$ 28	$ 16

Defined Benefit Plan, Change in

Defined Benefit Plan, Change in Obligations and Fair Value (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Defined Benefit Plan, Fair Value of Plan Assets		$ 3,432	[1]	$ 3,156	[2]
Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation	[3]	2,910	[4]	2,747	[4]	$ 2,716
Defined Benefit Plan, Service Cost	[5]	5	[3]	5	[3]	5
Defined Benefit Plan, Interest Cost		95	[3]	97	[3]	116
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	[3]	0		0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	[3]	225		76
Defined Benefit Plan, Benefit Obligation, Benefits Paid	[3]	156		142
Defined Benefit Plan, Benefit Obligation, Administrative Expenses	[3]	(6)		(5)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	[3]	0		0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits	[3]	0		0
Defined Benefit Plan, Fair Value of Plan Assets	[3]	3,288	[6]	3,016	[6]	2,879
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	[3]	425		279
Defined Benefit Plan, Plan Assets, Contributions by Employer	[3]	9		5
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	[3]	0		0
Defined Benefit Plan, Plan Assets, Benefits Paid	[3]	(156)		(142)
Defined Benefit Plan, Plan Assets, Administration Expense	[3]	(6)		(5)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	[3],[7]	$ 378		$ 269
Defined Benefit Plan, Funded Percentage	[3]	113.00%		110.00%
Defined Benefit Plan, Accumulated Benefit Obligation	[3]	$ 2,910		$ 2,747
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	[3]	3.62%		4.18%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Benefit Obligation		$ 58	[4]	$ 58	[4]	65
Defined Benefit Plan, Service Cost		0		0		0
Defined Benefit Plan, Interest Cost		1		2		2
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		4		4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		(1)		(4)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		8		9
Defined Benefit Plan, Benefit Obligation, Administrative Expenses		0		0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		(5)		0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits		9		0
Defined Benefit Plan, Fair Value of Plan Assets		164	[6]	157	[6]	$ 156
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		11		5
Defined Benefit Plan, Plan Assets, Contributions by Employer	[8]	0		0
Defined Benefit Plan, Plan Assets, Benefits Paid		(8)		(9)
Defined Benefit Plan, Plan Assets, Administration Expense		0		0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	[9]	$ 106		$ 99
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.29%		3.70%
Market Approach Valuation Technique [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		$ 4		$ 5
[1]	Fair value measurements do not include pension benefits accrued income amounting to less than 0.7% of total plan assets.
[2]	Fair value measurements do not include pension benefits accrued income amounting to less than 0.6% of total plan assets.
[3]	Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets.
[4]	Includes $78 million and $80 million of benefit obligations for the unfunded nonqualified supplemental pension plans at December 31, 2017 and 2016, respectively.
[5]	Administrative fees are recognized in service cost for each of the periods presented.
[6]	Includes $1 million and $2 million of the Company's common stock acquired by the asset manager and held as part of the equity portfolio for pension benefits at December 31, 2017 and 2016, respectively. During both 2017 and 2016, there was no SunTrust common stock held in the other postretirement benefit plans.
[7]	Pension benefits recorded in the Consolidated Balance Sheets included other assets of $456 million and $349 million, and other liabilities of $78 million and $80 million, at December 31, 2017 and 2016, respectively.
[8]	The Company contributed less than $1 million to the other postretirement benefits plans during both 2017 and 2016.
[9]	Other postretirement benefits recorded in the Consolidated Balance Sheets included other assets of $106 million and $99 million at December 31, 2017 and 2016, respectively.

Defined Benefit Plan, Change127

Defined Benefit Plan, Change in Obligations and Fair Value (Additional Information) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Assets	$ 8,949	$ 6,405
Other Liabilities	4,179	2,996
Pension Plan [Member]
Liability, Defined Benefit Plan, Current	78	80
Common Stock Held in Pension Plan	1	2
Other Assets	456	349
Other Liabilities	78	80
Other Postretirement Benefits Plan [Member]
Other Assets	$ 106	$ 99

Components of Net Periodic Bene

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Pension Plan [Member]
Defined Benefit Plan, Service Cost	[1]	$ 5	[2]	$ 5	[2]	$ 5
Defined Benefit Plan, Interest Cost		95	[2]	97	[2]	116
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(195)		(186)		(206)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		0		0		0
Defined Benefit Plan, Amortization of Gain (Loss)		25		25		21
Defined Benefit Plan, Other Cost (Credit)		0		0		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	[1]	$ (70)		$ (59)		$ (64)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		4.18%		4.44%		4.09%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		6.66%		6.68%		6.91%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Service Cost		$ 0		$ 0		$ 0
Defined Benefit Plan, Interest Cost		1		2		2
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(5)		(5)		(5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		(6)		(6)		(6)
Defined Benefit Plan, Amortization of Gain (Loss)		0		0		0
Defined Benefit Plan, Other Cost (Credit)		9		0		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		$ (1)		$ (9)		$ (9)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.70%		3.95%		3.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		3.12%		3.13%		3.50%
[1]	Administrative fees are recognized in service cost for each of the periods presented.
[2]	Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets.

Amounts Recognized in AOCI (Det

Amounts Recognized in AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	$ (6)	$ (6)	$ (6)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), Before Tax	(25)	(25)	$ (21)
Pension Plan [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1,001	1,031
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	1,001	1,031
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	(25)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(30)
Defined Benefit Plans Recognized in Periodic Benefit Cost and Accumulated Comprehensive Income	(100)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(58)	(59)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(22)	(15)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(80)	$ (74)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(7)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(6)
Defined Benefit Plans Recognized in Periodic Benefit Cost and Accumulated Comprehensive Income	$ (7)

Plan Assets Related to Pension

Plan Assets Related to Pension and OPB Benefits by Level within the Fair Value Hierarchy (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Defined Benefit Plan, Fair Value of Plan Assets		$ 3,432	[1]	$ 3,156	[2]
Defined Benefit Plan Accrued Income Threshold for Inclusion, Percent of Total Plan Assets		1.00%		1.00%
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 1,743	[1]	$ 1,675	[2]
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		1,689	[1]	1,481	[2]
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Money Market Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets		138	[1],[3]	112	[2],[4]
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		138	[1],[3]	112	[2],[4]
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[3]	0	[2],[4]
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[3]	0	[2],[4]
Pension Plan [Member]
Defined Benefit Plan, Fair Value of Plan Assets	[5]	3,288	[6]	3,016	[6]	$ 2,879
Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		936	[1]	1,415	[2]
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		936	[1]	1,415	[2]
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Pension Plan [Member] | Future [Member]
Defined Benefit Plan, Fair Value of Plan Assets		(5)	[1]	(5)	[2]
Pension Plan [Member] | Future [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		(5)	[1]	0	[2]
Pension Plan [Member] | Future [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	5	[2]
Pension Plan [Member] | Future [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Pension Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		2,201	[1]	1,486	[2]
Pension Plan [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		512	[1]	0	[2]
Pension Plan [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		1,689	[1]	1,486	[2]
Pension Plan [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Pension Plan [Member] | Other Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets		9	[1]	6	[2]
Pension Plan [Member] | Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		9	[1]	6	[2]
Pension Plan [Member] | Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Pension Plan [Member] | Other Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1]	0	[2]
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Fair Value of Plan Assets		164	[6]	157	[6]	$ 156
Other Postretirement Benefits Plan [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		11	[1],[3]	16	[2],[4]
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets		56	[1],[7]	47	[2],[8]
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		56	[1],[7]	47	[2],[8]
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[7]	0	[2],[8]
Other Postretirement Benefits Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[7]	0	[2],[8]
Other Postretirement Benefits Plan [Member] | Nontaxable Municipal Bonds [Member]
Defined Benefit Plan, Fair Value of Plan Assets		85	[1],[7]	82	[2],[8]
Other Postretirement Benefits Plan [Member] | Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		85	[1],[7]	82	[2],[8]
Other Postretirement Benefits Plan [Member] | Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[7]	0	[2],[8]
Other Postretirement Benefits Plan [Member] | Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[7]	0	[2],[8]
Other Postretirement Benefits Plan [Member] | Taxable Fixed Income Index Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets		12	[1],[7]	13	[2],[8]
Other Postretirement Benefits Plan [Member] | Taxable Fixed Income Index Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		12	[1],[7]	13	[2],[8]
Other Postretirement Benefits Plan [Member] | Taxable Fixed Income Index Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		0	[1],[7]	0	[2],[8]
Other Postretirement Benefits Plan [Member] | Taxable Fixed Income Index Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 0	[1],[7]	$ 0	[2],[8]
[1]	Fair value measurements do not include pension benefits accrued income amounting to less than 0.7% of total plan assets.
[2]	Fair value measurements do not include pension benefits accrued income amounting to less than 0.6% of total plan assets.
[3]	Includes $11 million for other postretirement benefit plans.
[4]	Includes $16 million for other postretirement benefit plans.
[5]	Employer contributions represent the benefits that were paid to nonqualified plan participants. Unfunded nonqualified supplemental pension plans are not funded through plan assets.
[6]	Includes $1 million and $2 million of the Company's common stock acquired by the asset manager and held as part of the equity portfolio for pension benefits at December 31, 2017 and 2016, respectively. During both 2017 and 2016, there was no SunTrust common stock held in the other postretirement benefit plans.
[7]	Relates exclusively to other postretirement benefit plans.
[8]	Relates exclusively to other postretirement benefit plans.

Target and Weighted Average All

Target and Weighted Average Allocation for Pension and OPB Plans by Asset Category (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Cash Equivalents [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	0-10%
Defined Benefit Plan, Actual Plan Asset Allocations	4.00%	3.00%
Cash Equivalents [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	5-15%
Defined Benefit Plan, Actual Plan Asset Allocations	7.00%	10.00%
Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	0-40%
Defined Benefit Plan, Actual Plan Asset Allocations	29.00%	47.00%
Equity Securities [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	20-40%
Defined Benefit Plan, Actual Plan Asset Allocations	34.00%	30.00%
Debt Securities [Member] | Pension Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	40-100%
Defined Benefit Plan, Actual Plan Asset Allocations	67.00%	50.00%
Debt Securities [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Target Allocation Percentage	50-70%
Defined Benefit Plan, Actual Plan Asset Allocations	59.00%	60.00%

Expected Cash Flows for the Pen

Expected Cash Flows for the Pension Benefit and Other Postretirement Benefit Plans (Detail) $ in Millions	Dec. 31, 2017USD ($)
Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 210	[1]
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	172	[1]
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	172	[1]
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	170	[1]
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	167	[1]
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	824	[1]
Pension Plan [Member] | Plan Trusts [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	0	[1]
Pension Plan [Member] | Plan Participants
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	9	[1],[2]
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	7	[3]
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	6	[3]
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	6	[3]
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	6	[3]
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	5	[3]
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	18	[3]
Other Postretirement Benefits Plan [Member] | Plan Trusts [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	0	[3]
Other Postretirement Benefits Plan [Member] | Plan Participants
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0	[2],[3]
[1]	Based on the funding status and ERISA limitations, the Company anticipates contributions to the Retirement Plan will not be required during 2018.
[2]	The expected benefit payments for the SERP will be paid directly from the Company's corporate assets.
[3]	Expected payments under other postretirement benefit plans are shown net of participant contributions.

Guarantees - Additional Informa

Guarantees - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended
	May 31, 2009	Dec. 31, 2017	Dec. 31, 2016
Derivative Liability, Fair Value, Gross Asset		$ 2,731	$ 3,239
Standby Letters of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		2,600	2,900
Visa Interest [Member]
Derivative Liability, Fair Value, Gross Asset		15	15
Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member]
Number Of Shares Sold To Selected Financial Institutions	3.2
Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member]
Number Of Shares Sold To Selected Financial Institutions	3.2
Guarantee of Indebtedness of Others [Member]
Loss Contingency Related Loans Unpaid Principal Balance		3,400	2,900
Guarantor Obligations, Maximum Exposure, Undiscounted		962	787
Loss Contingency Accrual, at Carrying Value		$ 11	$ 6

Guarantees Mortgage Loans Repur

Guarantees Mortgage Loans Repurchase Reserve Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Guarantees [Abstract]
Reserve For Mortgage Loan Repurchase Losses	$ 39	$ 40	$ 57	$ 85
Mortgage Repurchase Reserve, Provision for Mortgage Loan Repurchase Losses	0	(17)	(12)
Charge Offs For Mortgage Loan Repurchase Losses	$ (1)	$ 0	$ (16)

Guarantees Repurchased Mortgage

Guarantees Repurchased Mortgage Loan (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Repurchased mortgage loans, carrying value	$ 219	$ 242
Performing Financial Instruments [Member] | Loans Held For Investment [Member]
Repurchased mortgage loans, carrying value	203	230
Nonperforming Financing Receivable [Member] | Loans Held For Investment [Member]
Repurchased mortgage loans, carrying value	$ 16	$ 12

Derivative Financial Instrum136

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Derivative Asset, Fair Value, Gross Asset	$ 3,904		$ 4,514
Derivative Liability, Fair Value, Gross Liability	4,442		4,902
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	21
Netted counterparty balance [Member]
Fair Value, Concentration of Risk, Derivative Instruments, Assets	541		774
Derivative Asset, Fair Value of Collateral	399		339
Derivative Credit Risk Valuation Adjustment, Derivative Assets	5		6
Netted counterparty balance gains [Member]
Fair Value, Concentration of Risk, Derivative Instruments, Assets	940		1,100
Derivative liability positions containing provisions conditioned on downgrades [Member]
Derivative Liability, Fair Value, Gross Liability	1,100		1,100
Additional Termination Event [Member]
Derivative Liability, Fair Value, Gross Liability	1
Additional Termination Event [Member] | Maximum [Member]
Derivative Liability, Fair Value, Gross Liability	17
Credit Support Annex [Member]
Derivative Liability, Fair Value, Gross Liability	1,100
Collateral Already Posted, Aggregate Fair Value	1,000
Credit Support Annex [Member] | Baa3/BBB [Member]
Additional Collateral, Aggregate Fair Value	2
Credit Support Annex [Member] | Ba1/BBB- or below [Member]
Additional Collateral, Aggregate Fair Value	2
Credit Default Swap, Buying Protection [Member]
Derivative, Notional Amount	5		135
Credit Risk Derivatives, at Fair Value, Net			3
Total Return Swap [Member]
Derivative Asset, Fair Value, Gross Asset	15		34
Derivative Liability, Fair Value, Gross Liability	13		31
Collateral Already Posted, Aggregate Fair Value	368		450
Derivative, Notional Amount	$ 1,700		$ 2,100
Financial Guarantee [Member]
Derivative, Average Remaining Maturity	5 years 6 months		8 years 6 months
Credit Derivative, Maximum Exposure, Undiscounted	$ 55		$ 95
Financial Guarantee [Member] | Minimum [Member]
Derivative, Remaining Maturity	1 year		1 year
Financial Guarantee [Member] | Maximum [Member]
Derivative, Remaining Maturity	9 years		31 years
Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Derivative Asset, Fair Value, Gross Asset	$ 2	[1]	$ 34	[2]
Derivative Liability, Fair Value, Gross Liability	$ 252	[1]	$ 265	[2]
Derivative, Average Remaining Maturity	3 years 7 months		4 years 1 month
Interest Rate Contract [Member] | Minimum [Member] | Cash Flow Hedging [Member]
Derivative, Remaining Maturity	1 year		1 year
Interest Rate Contract [Member] | Maximum [Member] | Cash Flow Hedging [Member]
Derivative, Remaining Maturity	5 years		6 years
[1]	See “Cash Flow Hedges” in this Note for further discussion.
[2]	See “Cash Flow Hedges” in this Note for further discussion.

Derivative Positions (Detail)

Derivative Positions (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Derivative Asset, Notional Amount		$ 143,238		$ 127,456
Derivative Asset, Fair Value, Gross Asset		3,904		4,514
Derivative Liability, Notional Amount		106,467		146,506
Derivative Liability, Fair Value, Gross Liability		4,442		4,902
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		3,904		4,514
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4,442		4,902
Derivative, Fair Value, Amount Offset Against Collateral, Net		(2,731)		(3,239)
Derivative Liability, Fair Value, Gross Asset		2,731		3,239
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(371)		(291)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(1,303)		(1,265)
Derivative Assets	[1]	(802)		(984)
Derivative Liabilities	[2]	408		398
Mortgage Servicing Rights [Member] | Interest rate futures [Member]
Derivative Liability, Notional Amount		16,600		6,700
Loans Held For Sale [Member] | Interest rate futures [Member]
Derivative Asset, Notional Amount		190		720
Other Trading [Member] | Interest rate futures [Member]
Derivative Asset, Notional Amount		9,800		12,300
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount		136,108	[3]	120,396	[4]
Derivative Asset, Fair Value, Gross Asset		3,901	[3]	4,478	[4]
Derivative Liability, Notional Amount		93,417	[3]	130,916	[4]
Derivative Liability, Fair Value, Gross Liability		4,132	[3]	4,556	[4]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member]
Derivative Asset, Notional Amount		31,895	[3],[5]	12,165	[4],[6]
Derivative Asset, Fair Value, Gross Asset		119	[3],[5]	413	[4],[6]
Derivative Liability, Notional Amount		10,126	[3],[5]	18,774	[4],[6]
Derivative Liability, Fair Value, Gross Liability		119	[3],[5]	335	[4],[6]
Not Designated as Hedging Instrument [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		4,550	[3],[7]	11,774	[4],[8]
Derivative Asset, Fair Value, Gross Asset		9	[3],[7]	134	[4],[8]
Derivative Liability, Notional Amount		3,040	[3],[7]	8,306	[4],[8]
Derivative Liability, Fair Value, Gross Liability		6	[3],[7]	58	[4],[8]
Not Designated as Hedging Instrument [Member] | Loans Held For Investment [Member]
Derivative Asset, Notional Amount		90	[3]	100	[4]
Derivative Asset, Fair Value, Gross Asset		2	[3]	2	[4]
Derivative Liability, Notional Amount		85	[3]	36	[4]
Derivative Liability, Fair Value, Gross Liability		2	[3]	1	[4]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Asset, Notional Amount		3,409	[3]	3,231	[4]
Derivative Asset, Fair Value, Gross Asset		110	[3]	161	[4]
Derivative Liability, Notional Amount		3,649	[3]	3,360	[4]
Derivative Liability, Fair Value, Gross Liability		102	[3]	148	[4]
Not Designated as Hedging Instrument [Member] | Equity Contract [Member]
Derivative Asset, Notional Amount		13,837	[3],[9]	17,225	[4],[10]
Derivative Asset, Fair Value, Gross Asset		2,499	[3],[9]	2,095	[4],[10]
Derivative Liability, Notional Amount		25,070	[3],[9]	28,658	[4],[10]
Derivative Liability, Fair Value, Gross Liability		2,857	[3],[9]	2,477	[4],[10]
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative Asset, Notional Amount		1,671	[3],[11]	2,412	[4],[12]
Derivative Asset, Fair Value, Gross Asset		18	[3],[11]	28	[4],[12]
Derivative Liability, Notional Amount		346	[3],[11]	668	[4],[12]
Derivative Liability, Fair Value, Gross Liability		16	[3],[11]	22	[4],[12]
Not Designated as Hedging Instrument [Member] | Commodity [Member]
Derivative Asset, Notional Amount		712	[3]	747	[4]
Derivative Asset, Fair Value, Gross Asset		63	[3]	75	[4]
Derivative Liability, Notional Amount		710	[3]	746	[4]
Derivative Liability, Fair Value, Gross Liability		61	[3]	73	[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		78,223	[3],[9]	70,599	[4],[10]
Derivative Asset, Fair Value, Gross Asset		1,066	[3],[9]	1,536	[4],[10]
Derivative Liability, Notional Amount		48,143	[3],[9]	67,477	[4],[10]
Derivative Liability, Fair Value, Gross Liability		946	[3],[9]	1,401	[4],[10]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Loans Held For Investment [Member]
Derivative Asset, Notional Amount		0	[3]	15	[4]
Derivative Asset, Fair Value, Gross Asset		0	[3]	0	[4]
Derivative Liability, Notional Amount		515	[3]	620	[4]
Derivative Liability, Fair Value, Gross Liability		11	[3]	8	[4]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		1,721	[3],[13]	2,128	[4],[14]
Derivative Asset, Fair Value, Gross Asset		15	[3],[13]	34	[4],[14]
Derivative Liability, Notional Amount		1,733	[3],[13]	2,271	[4],[14]
Derivative Liability, Fair Value, Gross Liability		12	[3],[13]	33	[4],[14]
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		5,850	[15]	6,400	[16]
Derivative Asset, Fair Value, Gross Asset		2	[15]	34	[16]
Derivative Liability, Notional Amount		8,350	[15]	11,050	[16]
Derivative Liability, Fair Value, Gross Liability		252	[15]	265	[16]
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		1,280	[17]	660	[18]
Derivative Asset, Fair Value, Gross Asset		1	[17]	2	[18]
Derivative Liability, Notional Amount		4,700	[17]	4,540	[18]
Derivative Liability, Fair Value, Gross Liability		58	[17]	81	[18]
Fair Value Hedging [Member] | Fixed Income Interest Rate [Member]
Derivative Asset, Notional Amount		1,250	[17]	600	[18]
Derivative Asset, Fair Value, Gross Asset		1	[17]	2	[18]
Derivative Liability, Notional Amount		4,670	[17]	4,510	[18]
Derivative Liability, Fair Value, Gross Liability		58	[17]	81	[18]
Fair Value Hedging [Member] | Brokered Time Deposits [Member]
Derivative Asset, Notional Amount		30	[17]	60	[18]
Derivative Asset, Fair Value, Gross Asset		0	[17]	0	[18]
Derivative Liability, Notional Amount		30	[17]	30	[18]
Derivative Liability, Fair Value, Gross Liability		$ 0	[17]	$ 0	[18]
[1]	At December 31, 2017, $802 million, net of $371 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $984 million, net of $291 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets.
[2]	At December 31, 2017, $408 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $398 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.
[3]	See “Economic Hedging and Trading Activities” in this Note for further discussion.
[4]	See “Economic Hedging and Trading Activities” in this Note for further discussion.
[5]	Amount includes $16.6 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.
[6]	Amount includes $6.7 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.
[7]	Amount includes $190 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.
[8]	Amount includes $720 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.
[9]	Amounts include $9.8 billion of notional amounts related to interest rate futures and $1.2 billion of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.
[10]	Amounts include $12.3 billion of notional amounts related to interest rate futures and $629 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.
[11]	Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16, “Guarantees” for additional information.
[12]	Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16, “Guarantees” for additional information.
[13]	Asset and liability amounts include $4 million and $11 million, respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.
[14]	Asset and liability amounts include $5 million and $13 million, respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.
[15]	See “Cash Flow Hedges” in this Note for further discussion.
[16]	See “Cash Flow Hedges” in this Note for further discussion.
[17]	See “Fair Value Hedges” in this Note for further discussion.
[18]	See “Fair Value Hedges” in this Note for further discussion.

Derivative Positions (Additiona

Derivative Positions (Additional Information) (Detail) - USD ($) shares in Millions, $ in Millions	1 Months Ended
	May 31, 2009	Dec. 31, 2017	Dec. 31, 2016
Derivative Asset, Notional Amount		$ 143,238	$ 127,456
Derivative Liability, Notional Amount		106,467	146,506
Credit Risk Contract [Member]
Derivative Asset, Notional Amount		4	5
Derivative Liability, Notional Amount		11	13
Other Contract [Member] | Visa Interest [Member]
Derivative Liability, Notional Amount		49	49
Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member]
Number Of Shares Sold To Selected Financial Institutions	3.2
Interest rate futures [Member] | Mortgage Servicing Rights [Member]
Derivative Liability, Notional Amount		16,600	6,700
Interest rate futures [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		190	720
Interest rate futures [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		9,800	12,300
Equity Futures [Member] | Equity Contract [Member]
Derivative Asset, Notional Amount		$ 1,222	$ 629

Impacts of Derivative Financial

Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 201		$ 440		$ 311
Mortgage Servicing Income [Member] | Mortgage Servicing Rights [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	42		62		19
Other Trading [Member] | Other Trading [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	42		51		61
Other Trading [Member] | Foreign Exchange Contract [Member]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(37)		101		93
Other Trading [Member] | Credit Risk Contract [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	26		19		23
Other Trading [Member] | Equity Contract [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			4		4
Other Trading [Member] | Commodity Contract [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1		3		2
Other Income [Member] | Loans Held For Investment [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments			(1)		(1)
Other Income [Member] | Credit Risk Contract [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(4)		(3)		(1)
Mortgage Production Income [Member] | Loans Held For Sale [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(54)		(6)		(45)
Mortgage Production Income [Member] | Other Contract [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	185		210		156
Cash Flow Hedging [Member] | Interest Income [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(54)	[1]	(145)	[2]	246	[3]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	38	[1]	147	[2]	169	[3]
Fair Value Hedging [Member] | Other Trading [Member]
Derivative, Gain (Loss) on Derivative, Net	(38)		(87)		(2)
Gain (Loss) on Fair Value Hedges Recognized in Earnings	40		89		1
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	2		2		(1)
Fair Value Hedging [Member] | Other Trading [Member] | Fixed Income Interest Rate [Member]
Derivative, Gain (Loss) on Derivative, Net	(38)	[4]	(87)	[5]	(2)	[6]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	40	[4]	89	[5]	1	[6]
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	2	[4]	2	[5]	(1)	[6]
Fair Value Hedging [Member] | Other Trading [Member] | Brokered Time Deposits [Member]
Derivative, Gain (Loss) on Derivative, Net	0	[4]	0	[5]	0	[6]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	[4]	0	[5]	0	[6]
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	$ 0	[4]	$ 0	[5]	$ 0	[6]
[1]	During the year ended December 31, 2017, the Company also reclassified $51 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized.
[2]	During the year ended December 31, 2016, the Company also reclassified $97 million of pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized.
[3]	During the year ended December 31, 2015, the Company also reclassified $92 million pre-tax gains from AOCI into Net interest income relating to hedging relationships that have been terminated and are reclassified into earnings consistent with the pattern of net cash flows expected to be recognized.
[4]	Amounts are recognized in Trading income in the Consolidated Statements of Income.
[5]	Amounts are recognized in Trading income in the Consolidated Statements of Income.
[6]	Amounts are recognized in Trading income in the Consolidated Statements of Income.

Impacts of Derivative Financ140

Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Terminated or dedesignated hedges [Member] | Interest Income [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 51	$ 97	$ 92

Derivative Financial Instrum141

Derivative Financial Instruments Netting of Financial Instruments - Derivatives (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 3,904	$ 4,514
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		3,904	4,514
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		3,102	3,530
Derivative Asset	[1]	802	984
Derivative, Collateral, Obligation to Return Securities		28	48
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		774	936
Derivative Liability, Fair Value, Gross Liability		4,442	4,902
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4,442	4,902
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		4,034	4,504
Derivative Liability	[2]	408	398
Derivative, Collateral, Right to Reclaim Securities		27	33
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		381	365
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		3,491	4,193
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		2,923	3,384
Derivative Asset		568	809
Derivative, Collateral, Obligation to Return Securities		28	48
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		540	761
Derivative Liability, Fair Value, Gross Liability		4,128	4,649
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		3,855	4,358
Derivative Liability		273	291
Derivative, Collateral, Right to Reclaim Securities		27	33
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		246	258
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		18	27
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		0	0
Derivative Asset		18	27
Derivative, Collateral, Obligation to Return Securities		0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		18	27
Derivative Liability, Fair Value, Gross Liability		130	105
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0	0
Derivative Liability		130	105
Derivative, Collateral, Right to Reclaim Securities		0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		130	105
Exchange Traded [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		395	294
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		179	146
Derivative Asset		216	148
Derivative, Collateral, Obligation to Return Securities		0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		216	148
Derivative Liability, Fair Value, Gross Liability		184	148
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		179	146
Derivative Liability		5	2
Derivative, Collateral, Right to Reclaim Securities		0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		$ 5	$ 2
[1]	At December 31, 2017, $802 million, net of $371 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $984 million, net of $291 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets.
[2]	At December 31, 2017, $408 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $398 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

Derivative Financial Instrum142

Derivative Financial Instruments Netting of Financial Instruments - Derivatives (Additional Information) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Asset	[1]	$ 802	$ 984
Derivative Asset, Collateral, Obligation to Return Cash, Offset		371	291
Derivative Liability	[2]	408	398
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		1,303	1,265
Trading Securities [Member]
Derivative [Line Items]
Derivative Asset		802	984
Trading Liabilities [Member]
Derivative [Line Items]
Derivative Liability		$ 408	$ 398
[1]	At December 31, 2017, $802 million, net of $371 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $984 million, net of $291 million offsetting cash collateral, is recognized in Trading assets and derivative instruments within the Company's Consolidated Balance Sheets.
[2]	At December 31, 2017, $408 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2016, $398 million, net of $1.3 billion offsetting cash collateral, is recognized in Trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

Fair Value Measurement and Elec

Fair Value Measurement and Election - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 288	$ 360	$ 1,790
Estimated Fair Value of Loan Portfolio's Net Carrying Value, Percentage	101.00%	101.00%
Loans Receivable, Fair Value Disclosure	$ 196	$ 222
Unfunded loan commitments and letters of credit	66,400	67,200
Allowance for unfunded loan commitments and letters of credit	84	71
Total Return Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	1,700	2,100
Interest Rate Lock Commitments [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	191	211
Trading Account Assets [Member] | SBA Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	368	310
Trading Account Assets [Member] | Commercial and Corporate Leveraged Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	48	46
Fair Value, Measurements, Recurring [Member]
Loans Receivable, Fair Value Disclosure	196	222
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Loans Receivable, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Loans Receivable, Fair Value Disclosure	$ 196	$ 222

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	$ 5,093		$ 6,067
Available-for-sale Securities	[2]	31,416		30,672
Loans Held-for-sale, Fair Value Disclosure		1,577		3,540
Loans Receivable, Fair Value Disclosure		196		222
Long-term Debt, Fair Value		530		963
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[3]	608		881
Available-for-sale Securities	[3]	4,382		5,507
Loans Held-for-sale, Fair Value Disclosure	[4]	0		0
Trading Liabilities, Fair Value Disclosure	[3]	769		846
Long-term Debt, Fair Value	[5]	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[3]	4,469		5,158
Available-for-sale Securities	[3]	26,544		24,532
Loans Held-for-sale, Fair Value Disclosure	[4]	2,239		4,161
Trading Liabilities, Fair Value Disclosure	[3]	498		483
Long-term Debt, Fair Value	[5]	8,834		11,051
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[3]	16		28
Available-for-sale Securities	[3]	490		633
Loans Held-for-sale, Fair Value Disclosure	[4]	54		17
Trading Liabilities, Fair Value Disclosure	[3]	16		22
Long-term Debt, Fair Value	[5]	1,058		728
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		5,093		6,067
Available-for-sale Securities		31,416		30,672
Loans Held-for-sale, Fair Value Disclosure		1,577		3,540
Loans Receivable, Fair Value Disclosure		196		222
Servicing Asset at Fair Value, Amount		1,710		1,572
Trading Liabilities, Fair Value Disclosure		1,283		1,351
Long-term Debt, Fair Value		530		963
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		608		881
Available-for-sale Securities		4,382		5,507
Loans Held-for-sale, Fair Value Disclosure		0		0
Loans Receivable, Fair Value Disclosure		0		0
Servicing Asset at Fair Value, Amount		0		0
Trading Liabilities, Fair Value Disclosure		769		846
Deposits, Fair Value Disclosure		0		0
Long-term Debt, Fair Value		0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		7,571		8,688
Available-for-sale Securities		26,544		24,532
Loans Held-for-sale, Fair Value Disclosure		1,577		3,528
Loans Receivable, Fair Value Disclosure		0		0
Servicing Asset at Fair Value, Amount		0		0
Trading Liabilities, Fair Value Disclosure		4,532		4,987
Deposits, Fair Value Disclosure		236		78
Long-term Debt, Fair Value		530		963
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		16		28
Available-for-sale Securities		490		633
Loans Held-for-sale, Fair Value Disclosure		0		12
Loans Receivable, Fair Value Disclosure		196		222
Servicing Asset at Fair Value, Amount		1,710		1,572
Trading Liabilities, Fair Value Disclosure		16		22
Deposits, Fair Value Disclosure		0		0
Long-term Debt, Fair Value		0		0
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		157		539
Available-for-sale Securities		4,331		5,405
Trading Liabilities, Fair Value Disclosure		577		697
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
Trading Liabilities, Fair Value Disclosure		0		0
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
Trading Liabilities, Fair Value Disclosure		0		0
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		395		480
Available-for-sale Securities		259		313
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		61		134
Available-for-sale Securities		617		275
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		4
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities				0
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities				1
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities				0
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0		0
Trading Liabilities, Fair Value Disclosure		0		0
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		655		656
Available-for-sale Securities		12		30
Trading Liabilities, Fair Value Disclosure		289		255
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		5		5
Trading Liabilities, Fair Value Disclosure		0		0
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		118		140
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		56		49
Available-for-sale Securities		51	[6]	102	[7]
Trading Liabilities, Fair Value Disclosure		9
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		0	[6]	0	[7]
Trading Liabilities, Fair Value Disclosure		0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Available-for-sale Securities		418	[6]	540	[7]
Trading Liabilities, Fair Value Disclosure		0
Derivative Financial Instruments, Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		802		984
Derivative Financial Instruments, Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		395		293
Derivative Financial Instruments, Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		3,493		4,193
Derivative Financial Instruments, Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		16		28
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		2,149		2,517
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		8		10
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		408		398
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		183		149
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		4,243		4,731
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		16		22
Brokered Time Deposits [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits, Fair Value Disclosure		236		78
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[3]	5,093		6,067
Available-for-sale Securities	[3]	31,416		30,672
Loans Held-for-sale, Fair Value Disclosure	[4]	2,293		4,178
Trading Liabilities, Fair Value Disclosure	[3]	1,283		1,351
Long-term Debt, Fair Value	[5]	9,892		11,779
Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		157		539
Available-for-sale Securities		4,331		5,405
Trading Liabilities, Fair Value Disclosure		577		697
Estimate of Fair Value Measurement [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		395		480
Available-for-sale Securities		259		313
Estimate of Fair Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		61		134
Available-for-sale Securities		617		279
Estimate of Fair Value Measurement [Member] | Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities				1
Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		655		656
Available-for-sale Securities		17		35
Trading Liabilities, Fair Value Disclosure		289		255
Estimate of Fair Value Measurement [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		118		140
Estimate of Fair Value Measurement [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		56		49
Available-for-sale Securities		469	[6]	642	[7]
Trading Liabilities, Fair Value Disclosure		9
Estimate of Fair Value Measurement [Member] | Trading Loans [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		2,149		2,517
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		8		10
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[3]	5,093		6,067
Available-for-sale Securities	[3]	31,416		30,672
Loans Held-for-sale, Fair Value Disclosure	[4]	2,290		4,169
Trading Liabilities, Fair Value Disclosure	[3]	1,283		1,351
Long-term Debt, Fair Value	[5]	9,785		11,748
Netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		(3,102)	[8]	(3,530)	[9]
Trading Liabilities, Fair Value Disclosure		(4,034)	[8]	(4,504)	[9]
Netting [Member] | Derivative Financial Instruments, Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		(3,102)	[8]	(3,530)	[9]
Netting [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		(4,034)	[8]	(4,504)	[9]
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		700		567
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Trading Liabilities, Fair Value Disclosure				0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		700		567
Trading Liabilities, Fair Value Disclosure				1
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Trading Liabilities, Fair Value Disclosure				0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		22,704		22,436
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		22,704		22,436
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2,086		1,226
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2,086		1,226
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		700		567
Trading Liabilities, Fair Value Disclosure				1
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		22,704		22,436
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Estimate of Fair Value Measurement [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		2,086		1,226
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		59		74
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		59		74
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		866		252
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		866		252
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0		0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		59		74
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Estimate of Fair Value Measurement [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 866		$ 252
[1]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[3]	Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote.
[4]	LHFS are generally valued based on observable current market prices or, if quoted market prices are not available, quoted market prices of similar instruments. Refer to the LHFS section within this footnote for further discussion. When valuation assumptions are not readily observable in the market, instruments are valued based on the best available data to approximate fair value. This data may be internally developed and considers risk premiums that a market participant would require under then-current market conditions.
[5]	Fair values for short-term borrowings and certain long-term debt are based on quoted market prices for similar instruments or estimated discounted cash flows utilizing the Company’s current incremental borrowing rate for similar types of instruments. Refer to the respective valuation section within this footnote for valuation information related to long-term debt that the Company measures at fair value. For level 3 debt, the terms are unique in nature or there are no similar instruments that can be used to value the instrument without using significant unobservable assumptions.
[6]	Includes $49 million of mutual fund investments, $15 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, and $2 million of other.
[7]	Includes $102 million of mutual fund investments, $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $6 million of other.
[8]	Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17, "Derivative Financial Instruments," for additional information.
[9]	Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists. See Note 17, "Derivative Financial Instruments," for additional information.

Assets and Liabilities Measu145

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Additional Information) (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, Fair Value Disclosure	$ 49	$ 102
Investment in Federal Home Loan Bank Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, Fair Value Disclosure	15	132
Federal Reserve Bank Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, Fair Value Disclosure	403	402
Equity Securities [Member]
Investments, Fair Value Disclosure	$ 2	$ 6

Fair Value Option Elected, Diff

Fair Value Option Elected, Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Loans Receivable, Fair Value Disclosure	$ 196	$ 222
Trading Loans [Member]
Loans Receivable, Fair Value Disclosure	2,149	2,517
Aggregate Unpaid Principal Balance Under the Fair Value Option	(2,111)	(2,488)
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	38	29
Loans Held For Sale [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans Receivable, Fair Value Disclosure	1
Aggregate Unpaid Principal Balance Under the Fair Value Option	(1)
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	0
Loans Held For Sale [Member] | Performing Financial Instruments [Member]
Loans Receivable, Fair Value Disclosure	1,576	3,540
Aggregate Unpaid Principal Balance Under the Fair Value Option	(1,533)	(3,516)
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	43	24
Loans Held For Investment [Member] | Performing Financial Instruments [Member]
Loans Receivable, Fair Value Disclosure	192	219
Aggregate Unpaid Principal Balance Under the Fair Value Option	(198)	(225)
Fair Value, Option, Loans Held as Assets, Aggregate Difference	(6)	(6)
Loans Held For Investment [Member] | Nonperforming Financing Receivable [Member]
Loans Receivable, Fair Value Disclosure	4	3
Aggregate Unpaid Principal Balance Under the Fair Value Option	(6)	(4)
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference	(2)	(1)
Brokered Time Deposits [Member]
Obligations, Fair Value Disclosure	236	78
Aggregate Unpaid Principal Balance Under the Fair Value Option	(233)	(80)
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments	3	(2)
Long-term Debt [Member]
Obligations, Fair Value Disclosure	530	963
Aggregate Unpaid Principal Balance Under the Fair Value Option	(517)	(924)
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments	$ 13	$ 39

Change in Fair Value of Financi

Change in Fair Value of Financial Instruments for which the FVO has been Elected (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Trading Loans [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		$ (21)	[1]	$ (15)	[2]	$ 1	[3]
Trading Loans [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(21)		(15)		1
Trading Loans [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0	[4]	0	[5]	0	[6]
Trading Loans [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Trading Loans [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Loans Held For Sale [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(61)	[1]	(75)	[2]	(44)	[3]
Loans Held For Sale [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Loans Held For Sale [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(61)	[4]	(75)	[5]	(44)	[6]
Loans Held For Sale [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Loans Held For Sale [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Loans Held For Investment [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	[3]					(5)
Loans Held For Investment [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)						0
Loans Held For Investment [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	[6]					0
Loans Held For Investment [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)						0
Loans Held For Investment [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)						(5)
Mortgage Servicing Rights [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		243	[1]	242	[2]	240	[3]
Mortgage Servicing Rights [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Mortgage Servicing Rights [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(5)	[4]	(3)	[5]	(2)	[6]
Mortgage Servicing Rights [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		248		245		242
Mortgage Servicing Rights [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Brokered Time Deposits [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	[2]			(4)
Brokered Time Deposits [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)				(4)
Brokered Time Deposits [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	[5]			0
Brokered Time Deposits [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)				0
Brokered Time Deposits [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)				0
Long-term Debt [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(21)	[1]	(27)	[2]	(41)	[3]
Long-term Debt [Member] | Trading Revenue [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(21)		(27)		(41)
Long-term Debt [Member] | Mortgage Production Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0	[4]	0	[5]	0	[6]
Long-term Debt [Member] | Mortgage Servicing Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		0		0		0
Long-term Debt [Member] | Other Income [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		$ 0		$ 0		$ 0
[1]	Changes in fair value for the year ended December 31, 2017 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income.
[2]	Changes in fair value for the year ended December 31, 2016 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, brokered time deposits, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income.
[3]	Changes in fair value for the year ended December 31, 2015 exclude accrued interest for the period then ended. Interest income or interest expense on trading loans, LHFS, LHFI, and long-term debt that have been elected to be measured at fair value are recognized in Interest income or Interest expense in the Consolidated Statements of Income.
[4]	Income related to LHFS does not include income from IRLCs. For the year ended December 31, 2017, income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM.
[5]	Income related to LHFS does not include income from IRLCs. For the year ended December 31, 2016, income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM.
[6]	Income related to LHFS does not include income from IRLCs. For the year ended December 31, 2015, income related to residential MSRs includes income recognized upon the sale of loans reported at LOCOM.

Fair Value Election and Meas148

Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
level 3 fair value assumptions [Line Items]
Trading Securities	[1]	$ 5,093		$ 6,067
Available-for-sale Securities	[2]	31,416		30,672
Loans Held-for-sale, Fair Value Disclosure		1,577		3,540
Loans Receivable, Fair Value Disclosure		196		222
Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Trading Securities	[3]	16		28
Available-for-sale Securities	[3]	490		633
Loans Held-for-sale, Fair Value Disclosure	[4]	54		17
Fair Value, Measurements, Recurring [Member]
level 3 fair value assumptions [Line Items]
Trading Securities		5,093		6,067
Available-for-sale Securities		31,416		30,672
Loans Held-for-sale, Fair Value Disclosure		1,577		3,540
Loans Receivable, Fair Value Disclosure		196		222
Servicing Asset at Fair Value, Amount		1,710		1,572
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Trading Securities		16		28
Available-for-sale Securities		490		633
Loans Held-for-sale, Fair Value Disclosure		0		12
Loans Receivable, Fair Value Disclosure		196		222
Servicing Asset at Fair Value, Amount		1,710		1,572
Fair Value, Measurements, Recurring [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Other Assets, Fair Value Disclosure		0	[5]	6	[6]
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		418		540
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		8		10
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		5		5
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities				4
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		59		74
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Held-for-sale, Fair Value Disclosure				$ 12
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread				(1.04%)
Fair Value Inputs, Prepayment Rate				2.00%
Fair Value Inputs, Probability of Default				0.00%
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread				(1.25%)
Fair Value Inputs, Prepayment Rate				28.00%
Fair Value Inputs, Probability of Default				3.00%
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread				(1.24%)
Fair Value Inputs, Prepayment Rate				7.00%
Fair Value Inputs, Probability of Default				0.40%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Receivable, Fair Value Disclosure		4		$ 3
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Receivable, Fair Value Disclosure		$ 192		$ 219
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(0.62%)		(0.62%)
Fair Value Inputs, Prepayment Rate		2.00%		3.00%
Fair Value Inputs, Probability of Default		0.00%		0.00%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(7.84%)		(7.84%)
Fair Value Inputs, Prepayment Rate		34.00%		36.00%
Fair Value Inputs, Probability of Default		5.00%		5.00%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(2.15%)		(1.84%)
Fair Value Inputs, Prepayment Rate		11.00%		13.00%
Fair Value Inputs, Probability of Default		0.70%		2.10%
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Servicing Asset at Fair Value, Amount		$ 1,710		$ 1,572
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(1.00%)		(0.00%)
Fair Value Inputs, Prepayment Rate		6.00%		1.00%
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(125.00%)		(122.00%)
Fair Value Inputs, Prepayment Rate		30.00%		25.00%
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(4.00%)		(8.00%)
Fair Value Inputs, Prepayment Rate		13.00%		9.00%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		41.00%		40.00%
Fair Value Inputs, Msr Value		0.41%		0.22%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		100.00%		100.00%
Fair Value Inputs, Msr Value		1.90%		1.70%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		81.00%		81.00%
Fair Value Inputs, Msr Value		1.13%		1.06%
[1]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[3]	Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote.
[4]	LHFS are generally valued based on observable current market prices or, if quoted market prices are not available, quoted market prices of similar instruments. Refer to the LHFS section within this footnote for further discussion. When valuation assumptions are not readily observable in the market, instruments are valued based on the best available data to approximate fair value. This data may be internally developed and considers risk premiums that a market participant would require under then-current market conditions.
[5]	Amount represents the net of IRLC assets and liabilities and includes the derivative liability associated with the Company's sale of Visa shares. Refer to the "Trading Liabilities and Derivative Instruments" section herein for a discussion of valuation assumptions related to the Visa derivative liability.
[6]	Amount represents the net of IRLC assets and liabilities and includes the derivative liability associated with the Company's sale of Visa shares. Refer to the "Trading Liabilities and Derivative Instruments" section herein for a discussion of valuation assumptions related to the Visa derivative liability.

Reconciliation of the Beginning

Reconciliation of the Beginning and Ending Balances for Fair Valued Assets and Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Other Liabilities [Member]
Transfers to other balance sheet line items				$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value				0		$ 23
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements				(23)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3				0
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3				0
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period				0
Derivative contracts, net [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 0		6		15
Included in earnings		185	[1]	198	[2]
OCI		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		2
Sales		0		0
Settlements		0		(2)
Transfers to other balance sheet line items		(191)		(211)
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		12	[1],[3]	7	[2],[4]
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value				6		104
Included in earnings				197
OCI				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases				2
Sales				(88)
Settlements				(2)
Transfers to other balance sheet line items				(211)
Transfers into Level 3				0
Transferred Out of Level 3 in The Fair Value Hierarchy				0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income	[4]			7
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		4		5
Included in earnings		0		0
OCI		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		0		0
Settlements		(4)		(1)
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		0		0
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		59		74		94
Included in earnings		(1)		0
OCI		(1)	[5]	(1)	[6]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		0		0
Settlements		(15)		(21)
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		(1)		0
Asset-backed Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		8		10		12
Included in earnings		0		0
OCI		(1)	[5]	(1)	[6]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		0		0
Settlements		(3)		(3)
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		0		0
Other Debt Obligations [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value				0		89
Included in earnings	[7]			(1)
OCI				0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases				0
Sales				(88)
Settlements				0
Transfers to other balance sheet line items				0
Transfers into Level 3				0
Transferred Out of Level 3 in The Fair Value Hierarchy				0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income				0
Corporate Debt Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		5		5		5
Included in earnings		0		0
OCI		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		0		0
Settlements		0		0
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		0		0
Equity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		418		540		440
Included in earnings		1		0
OCI		(1)	[5]	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		75		308
Sales		(1)		0
Settlements		(191)		(208)
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		(5)		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		0		0
Available-for-sale Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		490		633		556
Included in earnings		0		0
OCI		(1)	[5]	(2)	[6]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		75		308
Sales		(1)		0
Settlements		(213)		(233)
Transfers to other balance sheet line items		0		0
Transfers into Level 3		0		0
Transferred Out of Level 3 in The Fair Value Hierarchy		(5)		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		(1)		0
Residential Mortgage, Loans Held For Sale [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0		12		5
Included in earnings		0		(1)	[8]
OCI		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		(25)		(35)
Settlements		(1)		0
Transfers to other balance sheet line items		(4)		(5)
Transfers into Level 3		26		52
Transferred Out of Level 3 in The Fair Value Hierarchy		(8)		(4)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		0		(1)	[4],[8]
Loans Held For Investment [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		196		222		$ 257
Included in earnings		0	[9]	(2)	[8]
OCI		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0		0
Sales		0		0
Settlements		(34)		(44)
Transfers to other balance sheet line items		(3)		(1)
Transfers into Level 3		5		10
Transferred Out of Level 3 in The Fair Value Hierarchy		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		$ (1)	[3],[9]	$ (2)	[4],[8]
[1]	Includes issuances, fair value changes, and expirations. Amount related to residential IRLCs is recognized in Mortgage production related income, amount related to commercial IRLCs is recognized in Commercial real estate related income, and amount related to Visa derivative liability is recognized in Other noninterest expense.
[2]	Amounts recognized in OCI are included in change in net unrealized gains/(losses) on securities AFS, net of tax.
[3]	Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at December 31, 2017.
[4]	Change in unrealized gains/(losses) included in earnings during the period related to financial assets/liabilities still held at December 31, 2016.
[5]	Amounts recognized in OCI are included in change in net unrealized gains on securities AFS, net of tax.
[6]	Amounts recognized in OCI are included in change in net unrealized gains/(losses) on securities AFS, net of tax.
[7]	Includes issuances, fair value changes, and expirations. Amount related to residential IRLCs is recognized in Mortgage production related income and amount related to Visa derivative liability is recognized in Other noninterest expense.
[8]	Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income.
[9]	Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income.

Carrying Value of Those Assets

Carrying Value of Those Assets Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Comprehensive Income (Loss), Unrealized Credit Risk Gain (Loss) on Long-term Debt Arising During Period, Net of Tax	$ 3	$ (2)	$ 0
Transfer of Portfolio Loans and Leases to Held-for-sale	288	360	1,790
Allowance for Loan and Lease Losses, Write-offs	491	591	$ 470
Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	13
Asset Impairment Charges	0
Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	13
Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Loans Held For Investment [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	49	75
Asset Impairment Charges	0	0
Loans Held For Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Loans Held For Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Loans Held For Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	49	75
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	24	17
Asset Impairment Charges	(4)	(2)
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	1	0
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	23	17
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	53	112
Asset Impairment Charges	(43)	(36)
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	4	58
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	49	54
Nonperforming Financing Receivable [Member] | Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer of Portfolio Loans and Leases to Held-for-sale	31
Allowance for Loan and Lease Losses, Write-offs	5
Other Assets [Member] | Software and Software Development Costs [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	(28)	0
Other Assets [Member] | Equity Method Investments [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		(8)
Other Assets [Member] | Lease Agreements [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		(12)
Other Assets [Member] | Building [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	$ (10)	$ (12)

Carrying Amounts and Fair Value

Carrying Amounts and Fair Values of the Company's Financial Instruments (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Financial assets
Trading Securities	[1]	$ 5,093	$ 6,067
Available-for-sale Securities	[2]	31,416	30,672
Loans Held-for-sale, Fair Value Disclosure		1,577	3,540
Financial liabilities
Long-term Debt, Fair Value		530	963
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and Cash Equivalents, Fair Value Disclosure	[3]	6,912	6,423
Trading Securities	[4]	608	881
Available-for-sale Securities	[4]	4,382	5,507
Loans Held-for-sale, Fair Value Disclosure	[5]	0	0
Loans Net Fair Value Disclosure	[6]	0	0
Financial liabilities
Consumer And Commercial Deposits, Fair Value Disclosure	[7]	0	0
Short-term Debt, Fair Value	[8]	0	0
Long-term Debt, Fair Value	[8]	0	0
Trading liabilities	[4]	769	846
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and Cash Equivalents, Fair Value Disclosure	[3]	0	0
Trading Securities	[4]	4,469	5,158
Available-for-sale Securities	[4]	26,544	24,532
Loans Held-for-sale, Fair Value Disclosure	[5]	2,239	4,161
Loans Net Fair Value Disclosure	[6]	0	282
Financial liabilities
Consumer And Commercial Deposits, Fair Value Disclosure	[7]	160,586	160,280
Short-term Debt, Fair Value	[8]	4,781	4,764
Long-term Debt, Fair Value	[8]	8,834	11,051
Trading liabilities	[4]	498	483
Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and Cash Equivalents, Fair Value Disclosure	[3]	0	0
Trading Securities	[4]	16	28
Available-for-sale Securities	[4]	490	633
Loans Held-for-sale, Fair Value Disclosure	[5]	54	17
Loans Net Fair Value Disclosure	[6]	141,575	140,234
Financial liabilities
Consumer And Commercial Deposits, Fair Value Disclosure	[7]	0	0
Short-term Debt, Fair Value	[8]	0	0
Long-term Debt, Fair Value	[8]	1,058	728
Trading liabilities	[4]	16	22
Reported Value Measurement [Member]
Financial assets
Cash and Cash Equivalents, Fair Value Disclosure	[3]	6,912	6,423
Trading Securities	[4]	5,093	6,067
Available-for-sale Securities	[4]	31,416	30,672
Loans Held-for-sale, Fair Value Disclosure	[5]	2,290	4,169
Loans Net Fair Value Disclosure	[6]	141,446	141,589
Financial liabilities
Consumer And Commercial Deposits, Fair Value Disclosure	[7]	160,780	160,398
Short-term Debt, Fair Value	[8]	4,781	4,764
Long-term Debt, Fair Value	[8]	9,785	11,748
Trading liabilities	[4]	1,283	1,351
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Cash and Cash Equivalents, Fair Value Disclosure	[3]	6,912	6,423
Trading Securities	[4]	5,093	6,067
Available-for-sale Securities	[4]	31,416	30,672
Loans Held-for-sale, Fair Value Disclosure	[5]	2,293	4,178
Loans Net Fair Value Disclosure	[6]	141,575	140,516
Financial liabilities
Consumer And Commercial Deposits, Fair Value Disclosure	[7]	160,586	160,280
Short-term Debt, Fair Value	[8]	4,781	4,764
Long-term Debt, Fair Value	[8]	9,892	11,779
Trading liabilities	[4]	$ 1,283	$ 1,351
[1]	Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,086 million and $1,437 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[3]	Cash and cash equivalents are valued at their carrying amounts, which are reasonable estimates of fair value due to the relatively short period to maturity of the instruments.
[4]	Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote.
[5]	LHFS are generally valued based on observable current market prices or, if quoted market prices are not available, quoted market prices of similar instruments. Refer to the LHFS section within this footnote for further discussion. When valuation assumptions are not readily observable in the market, instruments are valued based on the best available data to approximate fair value. This data may be internally developed and considers risk premiums that a market participant would require under then-current market conditions.
[6]	LHFI fair values are based on a hypothetical exit price, which does not represent the estimated intrinsic value of the loan if held for investment. The assumptions used are expected to approximate those that a market participant purchasing the loans would use to value the loans, including a market risk premium and liquidity discount. Estimating the fair value of the loan portfolio when loan sales and trading markets are illiquid or nonexistent requires significant judgment.Generally, the Company measures fair value for LHFI based on estimated future discounted cash flows using current origination rates for loans with similar terms and credit quality, which derived an estimated value of 101% on the loan portfolio’s net carrying value at both December 31, 2017 and 2016. The value derived from origination rates likely does not represent an exit price; therefore, an incremental market risk and liquidity discount was applied when estimating the fair value of these loans. The discounted value is a function of a market participant’s required yield in the current environment and is not a reflection of the expected cumulative losses on the loans.
[7]	Deposit liabilities with no defined maturity such as DDAs, NOW/money market accounts, and savings accounts have a fair value equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). Fair values for CDs are estimated using a discounted cash flow approach that applies current interest rates to a schedule of aggregated expected maturities. The assumptions used in the discounted cash flow analysis are expected to approximate those that market participants would use in valuing deposits. The value of long-term relationships with depositors is not taken into account in estimating fair values. Refer to the respective valuation section within this footnote for valuation information related to brokered time deposits that the Company measures at fair value as well as those that are carried at amortized cost.
[8]	Fair values for short-term borrowings and certain long-term debt are based on quoted market prices for similar instruments or estimated discounted cash flows utilizing the Company’s current incremental borrowing rate for similar types of instruments. Refer to the respective valuation section within this footnote for valuation information related to long-term debt that the Company measures at fair value. For level 3 debt, the terms are unique in nature or there are no similar instruments that can be used to value the instrument without using significant unobservable assumptions.

Contingencies - Additional Info

Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Document Period End Date	Dec. 31, 2017
Minimum [Member]
Aggregate range of reasonably possible losses on legal matters in excess of the accrued liability	$ 0
Maximum [Member]
Aggregate range of reasonably possible losses on legal matters in excess of the accrued liability	160
Cash payment for litigation [Member] | Potential Mortgage Servicing Settlement and Claims [Member]
Loss Contingency, Damages Awarded, Value	50
Consumer relief obligation [Member] | Potential Mortgage Servicing Settlement and Claims [Member]
Loss Contingency, Damages Awarded, Value	$ 500

Business Segment Reporting (Det

Business Segment Reporting (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)segments		Dec. 31, 2016USD ($)	[1]	Dec. 31, 2015USD ($)	[2]
Number of Operating Segments | segments	2
Average Total Loans Held for Investment	$ 144,216		$ 141,118		$ 133,558
Average Total Deposits	159,549		154,189		144,203
Average Total Assets	204,931		199,004		188,892
Average Total Liabilities	180,630		174,936		165,546
Average Total Equity	24,301		24,068		23,346
Interest Income (Expense), Net	5,633		5,221		4,764
Fully Taxable Equivalent Adjustment	145		138		142
Net Interest Income Including Fully Taxable Equivalent Adjustment	5,778	[3]	5,359	[4]	4,906	[5]
Provision for Loan, Lease, and Other Losses	409	[6]	444	[7]	165	[8]
Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	5,369		4,915		4,741
Noninterest Income	3,354		3,383		3,268
Noninterest Expense	5,764		5,468		5,160
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,959		2,830		2,849
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	677	[9]	943	[10]	906	[11]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,282		1,887		1,943
Net Income (Loss) Attributable to Noncontrolling Interest	9		9		10
Net Income (Loss) Attributable to Parent	2,273		1,878		1,933
Consumer [Member]
Average Total Loans Held for Investment	72,622		69,455		65,637
Average Total Deposits	102,820		99,424		93,789
Average Total Assets	82,507		79,118		75,204
Average Total Liabilities	103,757		100,423		94,801
Average Total Equity	0		0		0
Interest Income (Expense), Net	3,698		3,465		3,324
Fully Taxable Equivalent Adjustment	0		0		1
Net Interest Income Including Fully Taxable Equivalent Adjustment	3,698	[3]	3,465	[4]	3,325	[5]
Provision for Loan, Lease, and Other Losses	368	[6]	172	[7]	27	[8]
Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	3,330		3,293		3,298
Noninterest Income	1,874		2,036		1,967
Noninterest Expense	3,842		3,796		3,631
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,362		1,533		1,634
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	491	[9]	568	[10]	553	[11]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	871		965		1,081
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0
Net Income (Loss) Attributable to Parent	871		965		1,081
Wholesale [Member]
Average Total Loans Held for Investment	71,521		71,600		67,872
Average Total Deposits	56,618		54,713		50,373
Average Total Assets	85,227		85,494		80,903
Average Total Liabilities	62,291		60,438		56,044
Average Total Equity	0		0		0
Interest Income (Expense), Net	2,247		2,018		1,918
Fully Taxable Equivalent Adjustment	142		136		138
Net Interest Income Including Fully Taxable Equivalent Adjustment	2,389	[3]	2,154	[4]	2,056	[5]
Provision for Loan, Lease, and Other Losses	41	[6]	272	[7]	137	[8]
Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	2,348		1,882		1,919
Noninterest Income	1,710		1,356		1,285
Noninterest Expense	1,869		1,676		1,523
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,189		1,562		1,681
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	816	[9]	583	[10]	628	[11]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,373		979		1,053
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0
Net Income (Loss) Attributable to Parent	1,373		979		1,053
Corporate Other [Member]
Average Total Loans Held for Investment	76		66		60
Average Total Deposits	175		124		101
Average Total Assets	34,567		31,952		29,668
Average Total Liabilities	14,610		14,148		14,771
Average Total Equity	0		0		0
Interest Income (Expense), Net	(44)		101		152
Fully Taxable Equivalent Adjustment	3		2		3
Net Interest Income Including Fully Taxable Equivalent Adjustment	(41)	[3]	103	[4]	155	[5]
Provision for Loan, Lease, and Other Losses	0	[6]	0	[7]	0	[8]
Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(41)		103		155
Noninterest Income	(33)		138		137
Noninterest Expense	73		13		17
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(147)		228		275
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(355)	[9]	59	[10]	81	[11]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	208		169		194
Net Income (Loss) Attributable to Noncontrolling Interest	9		9		10
Net Income (Loss) Attributable to Parent	199		160		184
Reconciling Items
Average Total Loans Held for Investment	(3)		(3)		(11)
Average Total Deposits	(64)		(72)		(60)
Average Total Assets	2,630		2,440		3,117
Average Total Liabilities	(28)		(73)		(70)
Average Total Equity	24,301		24,068		23,346
Interest Income (Expense), Net	(268)		(363)		(630)
Fully Taxable Equivalent Adjustment	0		0		0
Net Interest Income Including Fully Taxable Equivalent Adjustment	(268)	[3]	(363)	[4]	(630)	[5]
Provision for Loan, Lease, and Other Losses	0	[6]	0	[7]	1	[8]
Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(268)		(363)		(631)
Noninterest Income	(197)		(147)		(121)
Noninterest Expense	(20)		(17)		(11)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(445)		(493)		(741)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(275)	[9]	(267)	[10]	(356)	[11]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(170)		(226)		(385)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0
Net Income (Loss) Attributable to Parent	$ (170)		$ (226)		$ (385)
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	Presented on a matched maturity funds transfer price basis for the segments.
[4]	Presented on a matched maturity funds transfer price basis for the segments.
[5]	Presented on a matched maturity funds transfer price basis for the segments.
[6]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[7]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[8]	Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and Unfunded commitment reserve balances.
[9]	Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals
[10]	Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals
[11]	Includes regular Provision for income taxes as well as FTE income and tax credit adjustment reversals.

Accumulated Other Comprehens154

Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		$ (1)	$ (62)	$ 135	$ 298
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		(244)	(157)	87	97
Accumulated Other Comprehensive Income (Loss), Brokered Time Deposits, net of tax		(1)	(1)	0	0
Accumulated Other Comprehensive Income (Loss), Long-term Debt, Net of Tax		(4)	(7)	0	0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		(570)	(594)	(682)	(517)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(820)	(821)	(460)	$ (122)
Cumulative Effect of Credit Risk Adjustment	[1]		0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax		(7)	(194)	(150)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(31)	(91)	154
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Brokered Time Deposits Arising During Period, Net of Tax		0	(1)	0
Other Comprehensive Income (Loss), Unrealized Credit Risk Gain (Loss) on Long-term Debt Arising During Period, Net of Tax		3	(2)	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax		11	76	(174)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(24)	(212)	(170)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		68	(3)	(13)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		(56)	(153)	(164)
Other Comprehensive Income (Loss), Reclassification from AOCI on Brokered Time Deposits, Net of Tax		0	0	0
Other Comprehensive Income Loss Reclassfication Adjustment From AOCI on Long Term Debt, Net of Tax		0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax		13	12	9
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		25	(144)	(168)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		61	(197)	(163)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax		(87)	(244)	(10)
Other Comprehensive Income (Loss), Brokered Time Deposits, Net of Tax		0	(1)	0
Other Comprehensive Income (Loss), Long Term Debt, Adjustment, Net of Tax		(3)	2	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		(24)	(88)	165
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		$ 1	(356)	$ (338)
AOCI Attributable to Parent [Member]
Cumulative Effect of Credit Risk Adjustment	[1],[2]		$ (5)
[1]	Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk, beginning January 1, 2016. See Note 1, "Significant Accounting Policies," and Note 21, "Accumulated Other Comprehensive Loss," for additional information.
[2]	Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," for additional information.

Accumulated Other Comprehens155

Accumulated Other Comprehensive Income Reclassifications out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ (108)	$ 4	$ 21
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(40)	1	8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(68)	3	13
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	89	244	261
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	33	91	97
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	56	153	164
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(6)	(6)	(6)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), Before Tax	(25)	(25)	(21)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	19	19	15
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	6	7	6
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	13	12	9
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 25	$ (144)	$ (168)

Statements of Income_(Loss) - P

Statements of Income/(Loss) - Parent Company Only (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Interest and Dividend Income, Securities, Available-for-sale		$ 774	$ 651		$ 593
Interest Expense, Long-term Debt		288	260		252
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		2,814	2,692		2,707
Income Tax Expense (Benefit)		(532)	(805)		(764)
Net Income (Loss) Attributable to Parent		2,273	1,878	[1]	1,933	[2]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		1	(356)		(338)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		2,274	1,522		1,595
Net Income (Loss) Available to Common Stockholders, Basic		2,179	1,811		1,863
Parent Company [Member]
Interest and Dividend Income, Securities, Available-for-sale	[3]	1,414	1,300		1,159
Interest and Fee Income, Other Loans		25	15		8
Interest Income, Deposits with Other Federal Home Loan Banks		22	12		5
Other Income		5	2		9
Revenues		1,466	1,329		1,181
Interest Expense, Short-term Borrowings		4	2		1
Interest Expense, Long-term Debt		137	140		128
Labor and Related Expense	[4]	103	57		69
Fees and Commission Expense		12	12		6
Other Expenses		33	24		21
Operating Expenses		289	235		225
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		1,177	1,094		956
Income Tax Expense (Benefit)		72	59		61
Income (Loss) Before Equity in Undistributed Earnings of Subsidiaries		1,249	1,153		1,017
Equity in Undistributed Earnings of Subsidiaries		1,024	725		916
Net Income (Loss) Attributable to Parent		2,273	1,878		1,933
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		1	(356)		(338)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 2,274	$ 1,522		$ 1,595
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[3]	Substantially all dividend income is from subsidiaries (primarily the Bank).
[4]	Includes incentive compensation allocations between the Parent Company and subsidiaries.

Balance Sheets - Parent Company

Balance Sheets - Parent Company Only (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and Due from Banks		$ 5,349	$ 5,091
Interest-bearing Deposits in Banks and Other Financial Institutions		25	25
Cash and cash equivalents		6,912	6,423	$ 5,599	$ 8,229
Available-for-sale Securities	[1]	31,416	30,672
Goodwill		6,331	6,337
Other Assets		8,949	6,405
Total assets		205,962	204,875
Liabilities and Shareholders' Equity
Long-term Debt	[2],[3]	9,785	11,748
Other Liabilities		4,179	2,996
Total liabilities		180,808	181,257
Preferred Stock, Value, Outstanding		2,475	1,225	1,225
Common Stock, Value, Outstanding		550	550
Additional Paid in Capital		9,000	9,010
Retained Earnings (Accumulated Deficit)		17,540	16,000
Treasury Stock, Value	[4]	(3,591)	(2,346)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(820)	(821)	(460)	(122)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		25,154	23,618	23,437	23,005
Liabilities and Equity		205,962	204,875
Parent Company [Member]
Assets [Abstract]
Cash and Due from Banks		701	535
Cash, Cash Equivalents, and Short-term Investments		2,144	1,126
Interest-bearing Deposits in Banks and Other Financial Institutions		24	23
Cash and cash equivalents		2,869	1,684	$ 2,615	$ 2,623
Available-for-sale Securities		123	147
Due from Affiliates		1,218	2,516
Equity Method Investments		24,590	23,617
Investments in and Advances to Affiliates, Amount of Equity		1,423	1,359
Goodwill		211	211
Other Assets		547	528
Total assets		30,981	30,062
Liabilities and Shareholders' Equity
Due to Affiliate, Current		205	283
Short-term Bank Loans and Notes Payable		350	483
Long-term Debt		4,466	4,950
Other Liabilities		909	831
Total liabilities		5,930	6,547
Preferred Stock, Value, Outstanding		2,475	1,225
Common Stock, Value, Outstanding		550	550
Additional Paid in Capital		9,000	9,010
Retained Earnings (Accumulated Deficit)		17,540	16,000
Treasury Stock, Value		(3,694)	(2,449)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(820)	(821)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		25,051	23,515
Liabilities and Equity		$ 30,981	$ 30,062
[1]	Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $223 million and $0 million at December 31, 2017 and December 31, 2016, respectively.
[2]	Includes $530 million and $963 million of long-term debt measured at fair value at December 31, 2017 and 2016, respectively.
[3]	Includes debt of consolidated VIEs of $189 million and $222 million at December 31, 2017 and December 31, 2016, respectively.
[4]	At December 31, 2017, includes ($3,694) million for treasury stock and $103 million for noncontrolling interest.At December 31, 2016, includes ($2,448) million for treasury stock, ($1) million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At December 31, 2015, includes ($1,764) million for treasury stock,($2) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.

Statements of Cash Flow - Paren

Statements of Cash Flow - Parent Company Only (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Net Income (Loss) Attributable to Parent	$ 2,273	$ 1,878	[1]	$ 1,933	[2]
Gain (Loss) on Disposition of Business	(107)	0		0
Depreciation, Amortization and Accretion, Net	727	725		786
Deferred Income Tax Expense (Benefit)	344	111		21
Stock Option Compensation And Amortization Of Restricted Stock Compensation	160	126		89
Gain (Loss) on Sale of Securities, Net	108	(4)		(21)
Increase (Decrease) in Other Operating Assets	235	(800)		(407)
Increase (Decrease) in Other Operating Liabilities	(911)	(274)		(166)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	5,509	(681)		3,552
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	4,186	5,108		5,680
Proceeds from Sale of Available-for-sale Securities	2,854	197		2,708
Payments to Acquire Available-for-sale Securities	(8,299)	(8,610)		(9,882)
Proceeds from Divestiture of Businesses	261	0		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(2,885)	(11,157)		(5,316)
Proceeds from Issuance of Long-term Debt	2,844	6,705		1,351
Repayments of Long-term Debt	(4,562)	(3,231)		(5,684)
Proceeds from Issuance of Preferred Stock and Preference Stock	1,239	0		0
Payments for Repurchase of Common Stock	(1,314)	(806)		(679)
Payments for Repurchase of Warrants	0	(24)		0
Payments Related to Tax Withholding for Share-based Compensation	(39)	(48)		(36)
Proceeds from the exercise of stock options	21	25		17
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(2,135)	12,662		(866)
Cash and Cash Equivalents, Period Increase (Decrease)	489	824		(2,630)
Cash and cash equivalents	6,912	6,423		5,599		$ 8,229
Income Taxes Paid	415	813		497
Interest Paid	730	559		523
Parent Company [Member]
Net Income (Loss) Attributable to Parent	2,273	1,878		1,933
Equity in Undistributed Earnings of Subsidiaries	(1,024)	(725)		(916)
Depreciation, Amortization and Accretion, Net	5	3		6
Deferred Income Tax Expense (Benefit)	5	11		(4)
Stock Option Compensation And Amortization Of Restricted Stock Compensation	0	3		11
Gain (Loss) on Sale of Securities, Net	(1)	0		0
Increase (Decrease) in Other Operating Assets	(15)	(129)		(72)
Increase (Decrease) in Other Operating Liabilities	122	62		(28)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	1,365	1,103		930
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	38	49		66
Proceeds from Sale of Available-for-sale Securities	1	4		0
Payments to Acquire Available-for-sale Securities	(17)	(4)		(15)
Payments for (Proceeds from) Loans Receivable	1,298	(889)		1,042
Payments for (Proceeds from) Other Investing Activities	0	(3)		(2)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	1,320	(843)		1,091
Proceeds from (Repayments of) Short-term Debt	(211)	5		(763)
Proceeds from Issuance of Long-term Debt	9	2,005		0
Repayments of Long-term Debt	(482)	(1,784)		(29)
Proceeds from Issuance of Preferred Stock and Preference Stock	1,239	0		0
Payments for Repurchase of Common Stock	(1,314)	(806)		(679)
Payments for Repurchase of Warrants	0	(24)		0
Payments of Dividends	(723)	(564)		(539)
Payments Related to Tax Withholding for Share-based Compensation	(39)	(48)		(36)
Proceeds from the exercise of stock options	21	25		17
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(1,500)	(1,191)		(2,029)
Cash and Cash Equivalents, Period Increase (Decrease)	1,185	(931)		(8)
Cash and cash equivalents	2,869	1,684		2,615		$ 2,623
Income Taxes Paid	(489)	(886)		(499)
Income Taxes Received From (Paid To) Subsidiaries	414	812		481
Income Taxes Paid, Net	(75)	(74)		(18)
Interest Paid	$ 140	$ 135		$ 130
[1]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2016 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.
[2]	Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the year ended December 31, 2015 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.