Regions Financial (RF) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 07, 2018
Document Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	RF
Entity Registrant Name	REGIONS FINANCIAL CORP
Entity Central Index Key	1,281,761
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		1,123,148,818

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 1,766	$ 2,012
Interest-bearing deposits in other banks	1,419	1,899
Federal funds sold and securities purchased under agreements to resell	0	70
Debt Securities held to maturity	1,611	1,658
Available-for-sale Securities, Debt Securities	23,085	23,403
Loans held for sale	452	348
Loans, net of unearned income	79,822	79,947
Allowance for loan losses	(840)	(934)
Net loans	78,982	79,013
Other earning assets	1,640	1,891
Premises and equipment, net	2,065	2,064
Interest receivable	328	337
Goodwill	4,904	4,904
Residential mortgage servicing rights at fair value	356	336
Other identifiable intangible assets	167	177
Other assets	6,138	6,182
Total assets	122,913	124,294
Deposits:
Non-interest-bearing	36,935	36,127
Interest-bearing	60,055	60,762
Total deposits	96,990	96,889
Borrowed funds:
Other short-term borrowings	0	500
Total short-term borrowings	0	500
Long-term borrowings	7,949	8,132
Total borrowed funds	7,949	8,632
Other liabilities	2,108	2,581
Total liabilities	107,047	108,102
Stockholders’ equity:
Preferred stock	820	820
Common stock	12	12
Additional paid-in capital	15,639	15,858
Retained earnings	1,923	1,628
Treasury stock, at cost	(1,377)	(1,377)
Accumulated other comprehensive income (loss), net	(1,151)	(749)
Total stockholders’ equity	15,866	16,192
Total liabilities and stockholders’ equity	$ 122,913	$ 124,294

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Securities held to maturity, estimated fair value	$ 1,585	$ 1,667
Loans held for sale	$ 282	$ 325
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	3,000,000,000	3,000,000,000
Common Stock, Shares, Issued	1,163,817,064	1,175,327,565
Treasury Stock, Shares	41,259,320	41,259,320
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Par Value Per Share (in dollars per share)	$ 1	$ 1
Noncumulative Preferred Stock [Member]
Preferred Stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, shares issued	1,000,000	1,000,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Interest income, including other financing income on:
Loans, including fees		$ 851	$ 773
Debt securities - taxable		154	147
Loans held for sale		3	4
Other earning assets		19	15
Operating lease assets		20	27
Total interest income, including other financing income		1,047	966
Interest expense on:
Deposits		49	35
Short-term Borrowings		1	0
Long-term borrowings		72	50
Total interest expense		122	85
Depreciation expense on operating lease assets		16	22
Total interest expense and depreciation expense on operating lease assets		138	107
Net interest income and other financing income		909	859
Provision (credit) for loan losses		(10)	70
Net interest income and other financing income after provision (credit) for loan losses		919	789
Non-interest income:
Service charges on deposit accounts		171	168
Card and ATM fees		104	104
Investment management and trust fee income		58	56
Mortgage income		38	41
Other		136	105
Total non-interest income		507	474
Non-interest expense:
Salaries and employee benefits		495	461
Net occupancy expense		83	83
Furniture and equipment expense		81	79
Other		225	220
Total non-interest expense		884	843
Income from continuing operations before income taxes		542	420
Income tax expense		128	127
Income from continuing operations		414	293
Discontinued operations:
Income (loss) from discontinued operations before income taxes		0	13
Income tax expense (benefit)		0	5
Income (loss) from discontinued operations, net of tax		0	8
Net income		414	301
Net Income Loss From Continuing Operations Available To Common Stockholders Basic		398	277
Net income available to common shareholders		$ 398	$ 285
Weighted-average number of shares outstanding:
Basic (in shares)		1,127	1,209
Diluted (in shares)		1,141	1,224
Earnings per common share from continuing operations:
Basic (in dollars per share)	[1]	$ 0.35	$ 0.23
Diluted (in dollars per share)	[1]	0.35	0.23
Earnings per common share:
Basic (in dollars per share)	[1]	0.35	0.24
Diluted (in dollars per share)	[1]	0.35	0.23
Cash dividends declared per common share (in dollars per share)		$ 0.09	$ 0.065
[1]	Certain per share amounts may not appear to reconcile due to rounding.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 414	$ 301
Unrealized losses on securities transferred to held to maturity:
Unrealized losses on securities transferred to held to maturity during the period, net of tax	0	0
Less: Reclassification Adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Net of Tax	(2)	(2)
Net change in unrealized losses on securities transferred to held to maturity, net of tax	2	2
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period on securities available for sale (net of tax)	(310)	1
Less: reclassification adjustments for securities gains (losses) realized in net income (net of tax)	0	0
Net change in unrealized gains (losses) on securities available for sale, net of tax	(310)	1
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:
Unrealized holding gains (losses) on derivatives arising during the period (net of tax)	(92)	(4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	8	19
Net change in unrealized gains (losses) on derivative instruments, net of tax	(100)	(23)
Defined benefit pension plans and other post employment benefits:
Net actuarial gains (losses) arising during the period (net of tax)	(1)	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	(7)	(6)
Net change from defined benefit pension plans and other post employment benefits, net of tax	6	5
Other comprehensive income (loss), net of tax	(402)	(15)
Comprehensive income	$ 12	$ 286

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Unrealized losses on securities transferred to held to maturity during the period, tax	$ 0	$ 0
Amortization of unrealized losses on securities transferred to held to maturity, tax	(1)	(1)
Unrealized holding gains (losses) on available for sale securities, tax	(104)	1
Reclassification adjustments for securities gains (losses) realized in net income, tax	0	0
Unrealized holding gains (losses) on derivatives, tax	(31)	(1)
Reclassification adjustments for derivative gains (losses) realized in net income, tax	3	12
Net actuarial gains and losses arising during the period, tax	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ (2)	$ (3)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, At Cost [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]
Beginning Balance Outstanding (in shares) at Dec. 31, 2016		1	1,214
Beginning Balance at Dec. 31, 2016	$ 16,664	$ 820	$ 13	$ 17,092	$ 666	$ (1,377)	$ (550)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	301				301
Other comprehensive income (loss), net of tax	(15)						(15)
Cash dividends declared	(78)				(78)
Preferred stock dividends	(16)				(16)
Impact of share repurchase, shares			(10)
Impact of share repurchases, value	(150)		$ (1)	(149)
Impact of stock transaction under compensation plans, net, shares			1
Impact of stock transaction under compensation plans, net	16			16
Ending Balance Outstanding (in shares) at Mar. 31, 2017		1	1,205
Ending Balance at Mar. 31, 2017	16,722	$ 820	$ 12	16,959	873	(1,377)	(565)
Beginning Balance Outstanding (in shares) at Dec. 31, 2017		1	1,133
Beginning Balance at Dec. 31, 2017	16,192	$ 820	$ 12	15,858	1,628	(1,377)	(749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	(2)				(2)
Net income	414				414
Other comprehensive income (loss), net of tax	(402)						(402)
Cash dividends declared	(101)				(101)
Preferred stock dividends	$ (16)				(16)
Impact of share repurchase, shares	(78.1)		(12)
Impact of share repurchases, value	$ (235)			(235)
Impact of stock transaction under compensation plans, net, shares			1
Impact of stock transaction under compensation plans, net	16			16
Ending Balance Outstanding (in shares) at Mar. 31, 2018		1	1,122
Ending Balance at Mar. 31, 2018	$ 15,866	$ 820	$ 12	$ 15,639	$ 1,923	$ (1,377)	$ (1,151)

CONSOLIDATED STATEMENTS OF CHA8

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividend declared (in dollars per share)	$ 0.09	$ 0.065

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net income	$ 414	$ 301
Adjustments to reconcile net income to net cash from operating activities:
Provision (credit) for loan losses	(10)	70
Depreciation, amortization and accretion, net	121	140
Deferred income tax expense	103	62
Originations and purchases of loans held for sale	(690)	(650)
Proceeds from sales of loans held for sale	587	876
(Gain) loss on sale of loans, net	(14)	(24)
Net change in operating assets and liabilities:
Other earning assets	235	51
Interest receivable and other assets	(61)	(28)
Other liabilities	(529)	(79)
Other	(2)	13
Net cash from operating activities	154	732
Investing activities:
Proceeds from maturities of debt securities held to maturity	46	49
Proceeds from Sale of Available-for-sale Securities, Debt	7	429
Proceeds from maturities of debt securities available for sale	798	889
Proceeds from bank-owned life insurance	1	(2)
Purchases of debt securities available for sale	(876)	(1,138)
Purchases of debt securities held to maturity	0	(437)
Proceeds from sales of loans	272	7
Purchases of loans	(70)	(4)
Purchases of mortgage servicing rights	(2)	(8)
Net change in loans	(164)	103
Net purchases of other assets	(56)	(13)
Net cash from investing activities	(44)	(125)
Financing activities:
Net change in deposits	101	389
Net change in short-term borrowings	(500)	0
Proceeds from long-term borrowings	4,350	0
Payments on long-term borrowings	(4,500)	(1,750)
Cash dividends on common stock	(102)	(157)
Cash dividends on preferred stock	(16)	(16)
Repurchases of common stock	(235)	(150)
Payments Related to Tax Withholding for Share-based Compensation	(1)	0
Proceeds from (Payments for) Other Financing Activities	(3)	0
Net cash from financing activities	(906)	(1,684)
Net change in cash and cash equivalents	(796)	(1,077)
Cash and cash equivalents at beginning of year	3,981	5,451
Cash and cash equivalents at end of period	$ 3,185	$ 4,374

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION Regions Financial Corporation (“Regions” or the "Company”) provides a full range of banking and bank-related services to individual and corporate customers through its subsidiaries and branch offices located across the South, Midwest and Texas. The Company competes with other financial institutions located in the states in which it operates, as well as other adjoining states. Regions is subject to the regulations of certain government agencies and undergoes periodic examinations by certain regulatory authorities. The accounting and reporting policies of Regions and the methods of applying those policies that materially affect the consolidated financial statements conform with GAAP and with general financial services industry practices. The accompanying interim financial statements have been prepared in accordance with the instructions for Form 10-Q and, therefore, do not include all information and notes to the consolidated financial statements necessary for a complete presentation of financial position, results of operations, comprehensive income and cash flows in conformity with GAAP. In the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair presentation of the consolidated financial statements have been included. These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto in Regions’ Annual Report on Form 10-K for the year ended December 31, 2017 . Regions has evaluated all subsequent events for potential recognition and disclosure through the filing date of this Form 10-Q. See Note 16. On April 4, 2018, Regions entered into a stock purchase agreement to sell Regions Insurance Group, Inc. and related affiliates to BB&T Holdings, Inc. The transaction is expected to close in the third quarter of 2018, subject to regulatory approvals and customary closing conditions. Regions sold Morgan Keegan and related affiliates in April 2012. See Note 2, Note 13 and Note 16 for related disclosure. Effective January 1, 2018, the Company adopted new guidance related to several accounting topics.The cumulative effect of the retrospective application was a total reduction to retained earnings of $2 million , of which the individual components were immaterial. All prior period amounts impacted by guidance that required retrospective application have been revised. See Note 15 for related disclosure.

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS On April 4, 2018, Regions entered into a stock purchase agreement to sell Regions Insurance Group, Inc. and related affiliates to BB&T Insurance Holdings, Inc. The transaction is expected to generate an after-tax gain of approximately $200 million a nd Common Equity Tier 1 capital of approximately $300 million at closing, which is expected in the third quarter, subject to regulatory approvals and customary closing conditions. The transaction purchase price is not subject to any adjustment that would have a material impact to the consolidated financial statements. See Note 16 for related discussion. In connection with the agreement, the results of the entities being sold are reported in the Company's consolidated statements of income separately as discontinued operations for all periods presented because the pending sale met all of the criteria for reporting as discontinuing operations at March 31, 2018. On January 11, 2012, Regions entered into a stock purchase agreement to sell Morgan Keegan and related affiliates to Raymond James. The transaction closed on April 2, 2012. Regions Investment Management, Inc. (formerly known as Morgan Asset Management, Inc.) and Regions Trust were not included in the sale. In connection with the closing of the sale, Regions agreed to indemnify Raymond James for all litigation matters related to pre-closing activities. See Note 13 for related disclosure. Results of operations for the Morgan Keegan entities sold are presented separately as discontinued operations for all periods presented on the consolidated statements of income. This presentation is consistent with the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2017. The condensed balance sheets for the Regions Insurance Group, Inc. entities being sold are immaterial for disclosure as discontinued operations. The following table represents the condensed results of operations for the Regions Insurance Group, Inc. entities being sold as discontinued operations: Three Months Ended 2018 2017 (In millions) Non-interest income: Insurance commissions and fees $ 34 $ 36 Total non-interest income 34 36 Non-interest expense: Salaries and employee benefits 24 24 Net occupancy expense 1 2 Furniture and equipment expense 1 1 Other 7 7 Total non-interest expense 33 34 Income (loss) from discontinued operations before income taxes 1 2 Income tax expense (benefit) — 1 Income (loss) from discontinued operations, net of tax $ 1 $ 1 The following table represents the condensed results of operations for both the Regions Insurance Group, Inc. entities being sold and Morgan Keegan and Company, Inc. and related affiliates as discontinued operations: Three Months Ended 2018 2017 (In millions, except per share data) Income (loss) from discontinued operations before income taxes $ — $ 13 Income tax expense (benefit) — 5 Income (loss) from discontinued operations, net of tax $ — $ 8 Earnings (loss) per common share from discontinued operations: Basic $ 0.00 $ 0.01 Diluted $ 0.00 $ 0.01

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES DEBT SECURITIES The amortized cost, gross unrealized gains and losses, and estimated fair value of debt securities held to maturity and debt securities available for sale are as follows: March 31, 2018 Recognized in OCI (1) Not Recognized in OCI Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Carrying Value Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,010 $ — $ (38 ) $ 972 $ 1 $ (13 ) $ 960 Commercial agency 642 — (3 ) 639 — (14 ) 625 $ 1,652 $ — $ (41 ) $ 1,611 $ 1 $ (27 ) $ 1,585 Debt securities available for sale: U.S. Treasury securities $ 333 $ — $ (6 ) $ 327 $ 327 Federal agency securities 42 — — 42 42 Mortgage-backed securities: Residential agency 17,663 23 (534 ) 17,152 17,152 Residential non-agency 2 — — 2 2 Commercial agency 3,742 1 (82 ) 3,661 3,661 Commercial non-agency 774 3 (11 ) 766 766 Corporate and other debt securities 1,145 8 (18 ) 1,135 1,135 $ 23,701 $ 35 $ (651 ) $ 23,085 $ 23,085 December 31, 2017 Recognized in OCI (1) Not Recognized in OCI Amortized Gross Unrealized Gains Gross Unrealized Losses Carrying Value Gross Gross Estimated (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,051 $ — $ (40 ) $ 1,011 $ 12 $ (4 ) $ 1,019 Commercial agency 651 — (4 ) 647 5 (4 ) 648 $ 1,702 $ — $ (44 ) $ 1,658 $ 17 $ (8 ) $ 1,667 Debt securities available for sale: U.S. Treasury securities $ 333 $ — $ (2 ) $ 331 $ 331 Federal agency securities 28 — — 28 28 Mortgage-backed securities: Residential agency 17,622 53 (244 ) 17,431 17,431 Residential non-agency 3 — — 3 3 Commercial agency 3,739 5 (30 ) 3,714 3,714 Commercial non-agency 787 4 (3 ) 788 788 Corporate and other debt securities 1,093 20 (5 ) 1,108 1,108 $ 23,605 $ 82 $ (284 ) $ 23,403 $ 23,403 _________ (1) The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013. Debt securities with carrying values of $8.3 billion and $8.1 billion at March 31, 2018 and December 31, 2017 , respectively, were pledged to secure public funds, trust deposits and certain borrowing arrangements. Included within total pledged securities is approximately $49 million and $50 million of encumbered U.S. Treasury securities at March 31, 2018 and December 31, 2017 , respectively. The amortized cost and estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2018 , by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Value (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,010 $ 960 Commercial agency 642 625 $ 1,652 $ 1,585 Debt securities available for sale: Due in one year or less $ 48 $ 48 Due after one year through five years 964 952 Due after five years through ten years 418 414 Due after ten years 90 90 Mortgage-backed securities: Residential agency 17,663 17,152 Residential non-agency 2 2 Commercial agency 3,742 3,661 Commercial non-agency 774 766 $ 23,701 $ 23,085 The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2018 and December 31, 2017 . For debt securities transferred to held to maturity from available for sale, the analysis in the tables below is comparing the securities' original amortized cost to its current estimated fair value. These securities are segregated between investments that have been in a continuous unrealized loss position for less than twelve months and for twelve months or more. March 31, 2018 Less Than Twelve Months Twelve Months or More Total Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ — $ — $ 960 $ (51 ) $ 960 $ (51 ) Commercial agency 485 (8 ) 140 (9 ) 625 (17 ) $ 485 $ (8 ) $ 1,100 $ (60 ) $ 1,585 $ (68 ) Debt securities available for sale: U.S. Treasury securities $ 223 $ (3 ) $ 87 $ (3 ) $ 310 $ (6 ) Mortgage-backed securities: Residential agency 7,524 (169 ) 7,739 (365 ) 15,263 (534 ) Commercial agency 2,600 (50 ) 856 (32 ) 3,456 (82 ) Commercial non-agency 536 (9 ) 59 (2 ) 595 (11 ) Corporate and other debt securities 643 (14 ) 84 (4 ) 727 (18 ) $ 11,526 $ (245 ) $ 8,825 $ (406 ) $ 20,351 $ (651 ) December 31, 2017 Less Than Twelve Months Twelve Months or More Total Estimated Gross Estimated Gross Estimated Gross (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ — $ — $ 1,019 $ (32 ) $ 1,019 $ (32 ) Commercial agency — — 150 (7 ) 150 (7 ) $ — $ — $ 1,169 $ (39 ) $ 1,169 $ (39 ) Debt securities available for sale: U.S. Treasury securities $ 221 $ (1 ) $ 84 $ (1 ) $ 305 $ (2 ) Mortgage-backed securities: Residential agency 5,157 (40 ) 8,195 (204 ) 13,352 (244 ) Commercial agency 1,666 (10 ) 904 (20 ) 2,570 (30 ) Commercial non-agency 393 (2 ) 61 (1 ) 454 (3 ) Corporate and other debt securities 306 (2 ) 105 (3 ) 411 (5 ) $ 7,743 $ (55 ) $ 9,349 $ (229 ) $ 17,092 $ (284 ) The number of individual debt positions in an unrealized loss position in the tables above increased from 1,059 at December 31, 2017 to 1,364 at March 31, 2018 . The increase in the number of securities and the total amount of unrealized losses from year-end 2017 was primarily due to changes in market interest rates. In instances where an unrealized loss existed, there was no indication of an adverse change in credit on the underlying positions in the tables above. As it relates to these positions, management believes no individual unrealized loss, other than those discussed below, represented an OTTI as of those dates. The Company does not intend to sell, and it is not more likely than not that the Company will be required to sell, the positions before the recovery of their amortized cost basis, which may be at maturity. As part of the Company's normal process for evaluating OTTI, management did identify a limited number of positions where an OTTI was believed to exist as of March 31, 2018 . For the three months ended March 31, 2018 , such impairments were immaterial. Gross realized gains and gross realized losses on sales of debt securities available for sale are shown in the table below. The cost of securities sold is based on the specific identification method. Three Months Ended March 31 2018 2017 (In millions) Gross realized gains $ — $ 1 Gross realized losses — (1 ) Debt securities available for sale gains (losses), net $ — $ — EQUITY INVESTMENTS Effective January 1, 2018, Regions adopted new accounting guidance that requires equity investments to be recorded at fair value with changes in fair value reported in net income. Regions elected a measurement alternative to fair value for certain equity investments without a readily determinable fair value. See Note 15 for related disclosure. Marketable equity securities carried at fair value, which primarily consist of assets held for certain employee benefits and money market funds, are reported in other earning assets in the consolidated balance sheets. Total marketable equity securities were $525 million and $414 million at March 31, 2018 and December 31, 2017, respectively. Unrealized holding gains and losses for equity securities were immaterial at March 31, 2018. Equity investments without a readily determinable fair value primarily consist of investments in strategic partners and certain CRA projects. The carrying amount of equity investments measured under the measurement alternative, downward and upward adjustments for impairments and price changes from observable transactions are as follows: Three Months Ended March 31, 2018 (In millions) Carrying value, December 31, 2017 $ 31 Net additions — Downward adjustments for price changes and impairment — Upward adjustments for price changes (1) 7 Carrying value, March 31, 2018 $ 38 _________ (1) Upward adjustments for the three months ended March 31, 2018 related to an observable transaction by the same issuer in an arm's length transaction for a similar ownership interest. Total cumulative downward adjustments for equity investments without a determinable fair value for impairments and observable price changes were $4 million . Total cumulative upward adjustments for price changes from observable transactions were $7 million as of March 31, 2018.

Loans and the Allowance for Cre

Loans and the Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans and the Allowance for Credit Losses	LOANS AND THE ALLOWANCE FOR CREDIT LOSSES LOANS The following table presents the distribution of Regions' loan portfolio by segment and class, net of unearned income: March 31, 2018 December 31, 2017 (In millions, net of unearned income) Commercial and industrial $ 36,787 $ 36,115 Commercial real estate mortgage—owner-occupied 6,044 6,193 Commercial real estate construction—owner-occupied 306 332 Total commercial 43,137 42,640 Commercial investor real estate mortgage 3,742 4,062 Commercial investor real estate construction 1,845 1,772 Total investor real estate 5,587 5,834 Residential first mortgage 13,892 14,061 Home equity 9,916 10,164 Indirect—vehicles 3,310 3,326 Indirect—other consumer 1,611 1,467 Consumer credit card 1,237 1,290 Other consumer 1,132 1,165 Total consumer 31,098 31,473 $ 79,822 $ 79,947 During the three months ended March 31, 2018 and 2017 , Regions purchased approximately $70 million and $4 million in indirect-other consumer loans from third parties, respectively. During the three months ended March 31, 2018, Regions sold $254 million of residential first mortgage loans consisting primarily of performing troubled debt restructured loans as well as certain non-restructured interest-only loans. At March 31, 2018 , $22.1 billion in securities and net eligible loans held by Regions were pledged to secure current and potential borrowings from the FHLB. At March 31, 2018 , an additional $22.1 billion in net eligible loans held by Regions were pledged to the FRB for potential borrowings. ALLOWANCE FOR CREDIT LOSSES Regions determines the appropriate level of the allowance on a quarterly basis. Refer to Note 1 “Summary of Significant Accounting Policies” to the consolidated financial statements to the Annual Report on Form 10-K for the year ended December 31, 2017 , for a description of the methodology. ROLLFORWARD OF ALLOWANCE FOR CREDIT LOSSES The following tables present analyses of the allowance for credit losses by portfolio segment for the three months ended March 31, 2018 and 2017. The total allowance for loan losses and the related loan portfolio ending balances are disaggregated to detail the amounts derived through individual evaluation and collective evaluation for impairment. The allowance for loan losses related to individually evaluated loans is attributable to reserves for non-accrual commercial and investor real estate loans and all TDRs. The allowance for loan losses and the loan portfolio ending balances related to collectively evaluated loans is attributable to the remainder of the portfolio. Three Months Ended March 31, 2018 Commercial Investor Real Estate Consumer Total (In millions) Allowance for loan losses, January 1, 2018 $ 591 $ 64 $ 279 $ 934 Provision (credit) for loan losses (24 ) (4 ) 18 (10 ) Loan losses: Charge-offs (30 ) (8 ) (74 ) (112 ) Recoveries 10 2 16 28 Net loan losses (20 ) (6 ) (58 ) (84 ) Allowance for loan losses, March 31, 2018 547 54 239 840 Reserve for unfunded credit commitments, January 1, 2018 49 4 — 53 Provision (credit) for unfunded credit losses (4 ) — — (4 ) Reserve for unfunded credit commitments, March 31, 2018 45 4 — 49 Allowance for credit losses, March 31, 2018 $ 592 $ 58 $ 239 $ 889 Portion of ending allowance for loan losses: Individually evaluated for impairment $ 150 $ 10 $ 29 $ 189 Collectively evaluated for impairment 397 44 210 651 Total allowance for loan losses $ 547 $ 54 $ 239 $ 840 Portion of loan portfolio ending balance: Individually evaluated for impairment $ 700 $ 96 $ 476 $ 1,272 Collectively evaluated for impairment 42,437 5,491 30,622 78,550 Total loans evaluated for impairment $ 43,137 $ 5,587 $ 31,098 $ 79,822 Three Months Ended March 31, 2017 Commercial Investor Real Estate Consumer Total (In millions) Allowance for loan losses, January 1, 2017 $ 753 $ 85 $ 253 $ 1,091 Provision (credit) for loan losses 26 1 43 70 Loan losses: Charge-offs (58 ) (1 ) (65 ) (124 ) Recoveries 6 2 16 24 Net loan losses (52 ) 1 (49 ) (100 ) Allowance for loan losses, March 31, 2017 727 87 247 1,061 Reserve for unfunded credit commitments, January 1, 2017 64 5 — 69 Provision (credit) for unfunded credit losses 2 (1 ) — 1 Reserve for unfunded credit commitments, March 31, 2017 66 4 — 70 Allowance for credit losses, March 31, 2017 $ 793 $ 91 $ 247 $ 1,131 Portion of ending allowance for loan losses: Individually evaluated for impairment $ 228 $ 17 $ 56 $ 301 Collectively evaluated for impairment 499 70 191 760 Total allowance for loan losses $ 727 $ 87 $ 247 $ 1,061 Portion of loan portfolio ending balance: Individually evaluated for impairment $ 1,103 $ 126 $ 760 $ 1,989 Collectively evaluated for impairment 41,139 6,356 30,385 77,880 Total loans evaluated for impairment $ 42,242 $ 6,482 $ 31,145 $ 79,869 PORTFOLIO SEGMENT RISK FACTORS The following describe the risk characteristics relevant to each of the portfolio segments. Commercial —The commercial loan portfolio segment includes commercial and industrial loans to commercial customers for use in normal business operations to finance working capital needs, equipment purchases or other expansion projects. Commercial also includes owner-occupied commercial real estate mortgage loans to operating businesses, which are loans for long-term financing of land and buildings, and are repaid by cash flow generated by business operations. Owner-occupied construction loans are made to commercial businesses for the development of land or construction of a building where the repayment is derived from revenues generated from the business of the borrower. Collection risk in this portfolio is driven by the creditworthiness of underlying borrowers, particularly cash flow from customers’ business operations, and the sensitivity to market fluctuations in commodity prices. Investor Real Estate —Loans for real estate development are repaid through cash flow related to the operation, sale or refinance of the property. This portfolio segment includes extensions of credit to real estate developers or investors where repayment is dependent on the sale of real estate or income generated from the real estate collateral. A portion of Regions’ investor real estate portfolio segment consists of loans secured by residential product types (land, single-family and condominium loans) within Regions’ markets. Additionally, these loans are made to finance income-producing properties such as apartment buildings, office and industrial buildings, and retail shopping centers. Loans in this portfolio segment are particularly sensitive to the valuation of real estate. Consumer —The consumer loan portfolio segment includes residential first mortgage, home equity, indirect-vehicles, indirect-other consumer, consumer credit card, and other consumer loans. Residential first mortgage loans represent loans to consumers to finance a residence. These loans are typically financed over a 15 to 30 year term and, in most cases, are extended to borrowers to finance their primary residence. Home equity lending includes both home equity loans and lines of credit. This type of lending, which is secured by a first or second mortgage on the borrower’s residence, allows customers to borrow against the equity in their home. Real estate market values as of the time the loan or line is secured directly affect the amount of credit extended and, in addition, changes in these values impact the depth of potential losses. Indirect-vehicles lending, which is lending initiated through third-party business partners, largely consists of loans made through automotive dealerships. Indirect-other consumer lending represents other point of sale lending through third parties. Consumer credit card includes Regions branded consumer credit card accounts. Other consumer loans include other revolving consumer accounts, direct consumer loans, and overdrafts. Loans in this portfolio segment are sensitive to unemployment and other key consumer economic measures. CREDIT QUALITY INDICATORS The following tables present credit quality indicators for the loan portfolio segments and classes, excluding loans held for sale, as of March 31, 2018 , and December 31, 2017 . Commercial and investor real estate loan portfolio segments are detailed by categories related to underlying credit quality and probability of default. Regions assigns these categories at loan origination and reviews the relationship utilizing a risk-based approach on, at minimum, an annual basis or at any time management becomes aware of information affecting the borrowers' ability to fulfill their obligations. Both quantitative and qualitative factors are considered in this review process. These categories are utilized to develop the associated allowance for credit losses. • Pass—includes obligations where the probability of default is considered low; • Special Mention—includes obligations that have potential weakness that may, if not reversed or corrected, weaken the credit or inadequately protect the Company’s position at some future date. Obligations in this category may also be subject to economic or market conditions that may, in the future, have an adverse effect on debt service ability; • Substandard Accrual—includes obligations that exhibit a well-defined weakness that presently jeopardizes debt repayment, even though they are currently performing. These obligations are characterized by the distinct possibility that the Company may incur a loss in the future if these weaknesses are not corrected; • Non-accrual—includes obligations where management has determined that full payment of principal and interest is in doubt. Substandard accrual and non-accrual loans are often collectively referred to as “classified.” Special mention, substandard accrual, and non-accrual loans are often collectively referred to as “criticized and classified.” Classes in the consumer portfolio segment are disaggregated by accrual status. March 31, 2018 Pass Special Mention Substandard Accrual Non-accrual Total (In millions) Commercial and industrial $ 35,216 $ 609 $ 598 $ 364 $ 36,787 Commercial real estate mortgage—owner-occupied 5,558 250 134 102 6,044 Commercial real estate construction—owner-occupied 288 3 10 5 306 Total commercial $ 41,062 $ 862 $ 742 $ 471 $ 43,137 Commercial investor real estate mortgage $ 3,646 $ 48 $ 34 $ 14 $ 3,742 Commercial investor real estate construction 1,793 15 37 — 1,845 Total investor real estate $ 5,439 $ 63 $ 71 $ 14 $ 5,587 Accrual Non-accrual Total (In millions) Residential first mortgage $ 13,845 $ 47 $ 13,892 Home equity 9,847 69 9,916 Indirect—vehicles 3,310 — 3,310 Indirect—other consumer 1,611 — 1,611 Consumer credit card 1,237 — 1,237 Other consumer 1,132 — 1,132 Total consumer $ 30,982 $ 116 $ 31,098 $ 79,822 December 31, 2017 Pass Special Mention Substandard Accrual Non-accrual Total (In millions) Commercial and industrial $ 34,420 $ 686 $ 605 $ 404 $ 36,115 Commercial real estate mortgage—owner-occupied 5,674 236 165 118 6,193 Commercial real estate construction—owner-occupied 313 3 10 6 332 Total commercial $ 40,407 $ 925 $ 780 $ 528 $ 42,640 Commercial investor real estate mortgage $ 3,905 $ 63 $ 89 $ 5 $ 4,062 Commercial investor real estate construction 1,706 19 46 1 1,772 Total investor real estate $ 5,611 $ 82 $ 135 $ 6 $ 5,834 Accrual Non-accrual Total (In millions) Residential first mortgage $ 14,014 $ 47 $ 14,061 Home equity 10,095 69 10,164 Indirect—vehicles 3,326 — 3,326 Indirect—other consumer 1,467 — 1,467 Consumer credit card 1,290 — 1,290 Other consumer 1,165 — 1,165 Total consumer $ 31,357 $ 116 $ 31,473 $ 79,947 AGING ANALYSIS The following tables include an aging analysis of DPD for each portfolio segment and class as of March 31, 2018 and December 31, 2017 : March 31, 2018 Accrual Loans 30-59 DPD 60-89 DPD 90+ DPD Total 30+ DPD Total Accrual Non-accrual Total (In millions) Commercial and industrial $ 42 $ 28 $ 5 $ 75 $ 36,423 $ 364 $ 36,787 Commercial real estate mortgage—owner-occupied 25 3 1 29 5,942 102 6,044 Commercial real estate construction—owner-occupied — — — — 301 5 306 Total commercial 67 31 6 104 42,666 471 43,137 Commercial investor real estate mortgage 1 — — 1 3,728 14 3,742 Commercial investor real estate construction — 29 — 29 1,845 — 1,845 Total investor real estate 1 29 — 30 5,573 14 5,587 Residential first mortgage 78 42 196 316 13,845 47 13,892 Home equity 62 22 33 117 9,847 69 9,916 Indirect—vehicles 39 10 8 57 3,310 — 3,310 Indirect—other consumer 8 5 — 13 1,611 — 1,611 Consumer credit card 10 7 17 34 1,237 — 1,237 Other consumer 11 4 5 20 1,132 — 1,132 Total consumer 208 90 259 557 30,982 116 31,098 $ 276 $ 150 $ 265 $ 691 $ 79,221 $ 601 $ 79,822 December 31, 2017 Accrual Loans 30-59 DPD 60-89 DPD 90+ DPD Total 30+ DPD Total Accrual Non-accrual Total (In millions) Commercial and industrial $ 28 $ 7 $ 4 $ 39 $ 35,711 $ 404 $ 36,115 Commercial real estate mortgage—owner-occupied 18 8 1 27 6,075 118 6,193 Commercial real estate construction—owner-occupied — — — — 326 6 332 Total commercial 46 15 5 66 42,112 528 42,640 Commercial investor real estate mortgage 1 1 1 3 4,057 5 4,062 Commercial investor real estate construction — — — — 1,771 1 1,772 Total investor real estate 1 1 1 3 5,828 6 5,834 Residential first mortgage 95 85 216 396 14,014 47 14,061 Home equity 53 27 37 117 10,095 69 10,164 Indirect—vehicles 48 13 9 70 3,326 — 3,326 Indirect—other consumer 9 5 — 14 1,467 — 1,467 Consumer credit card 11 7 19 37 1,290 — 1,290 Other consumer 13 4 4 21 1,165 — 1,165 Total consumer 229 141 285 655 31,357 116 31,473 $ 276 $ 157 $ 291 $ 724 $ 79,297 $ 650 $ 79,947 IMPAIRED LOANS The following tables present details related to the Company’s impaired loans as of March 31, 2018 and December 31, 2017 . Loans deemed to be impaired include all TDRs and all non-accrual commercial and investor real estate loans, excluding leases. Loans that have been fully charged-off do not appear in the tables below. Non-accrual Impaired Loans As of March 31, 3018 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Non-accrual Status Impaired Loans on Non-accrual Status with No Related Allowance Impaired Loans on Non-accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 441 $ 81 $ 360 $ 31 $ 329 $ 89 38.5 % Commercial real estate mortgage—owner-occupied 113 11 102 18 84 33 38.9 Commercial real estate construction—owner-occupied 5 — 5 — 5 2 40.0 Total commercial 559 92 467 49 418 124 38.6 Commercial investor real estate mortgage 22 8 14 1 13 5 59.1 Commercial investor real estate construction 1 1 — — — — 100.0 Total investor real estate 23 9 14 1 13 5 60.9 Residential first mortgage 41 10 31 — 31 3 31.7 Home equity 10 1 9 — 9 — 10.0 Total consumer 51 11 40 — 40 3 27.5 $ 633 $ 112 $ 521 $ 50 $ 471 $ 132 38.5 % Accruing Impaired Loans As of March 31, 2018 Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Book Value (3) Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 181 $ 7 $ 174 $ 22 16.0 % Commercial real estate mortgage—owner-occupied 63 5 58 4 14.3 Commercial real estate construction—owner-occupied 1 — 1 — — Total commercial 245 12 233 26 15.5 Commercial investor real estate mortgage 55 2 53 2 7.3 Commercial investor real estate construction 29 — 29 3 10.3 Total investor real estate 84 2 82 5 8.3 Residential first mortgage 194 6 188 18 12.4 Home equity 240 1 239 8 3.8 Consumer credit card 1 — 1 — — Other consumer 8 — 8 — — Total consumer 443 7 436 26 7.4 $ 772 $ 21 $ 751 $ 57 10.1 % Total Impaired Loans As of March 31, 2018 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans Impaired Loans with No Related Allowance Impaired Loans with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 622 $ 88 $ 534 $ 31 $ 503 $ 111 32.0 % Commercial real estate mortgage—owner-occupied 176 16 160 18 142 37 30.1 Commercial real estate construction—owner-occupied 6 — 6 — 6 2 33.3 Total commercial 804 104 700 49 651 150 31.6 Commercial investor real estate mortgage 77 10 67 1 66 7 22.1 Commercial investor real estate construction 30 1 29 — 29 3 13.3 Total investor real estate 107 11 96 1 95 10 19.6 Residential first mortgage 235 16 219 — 219 21 15.7 Home equity 250 2 248 — 248 8 4.0 Consumer credit card 1 — 1 — 1 — — Other consumer 8 — 8 — 8 — — Total consumer 494 18 476 — 476 29 9.5 $ 1,405 $ 133 $ 1,272 $ 50 $ 1,222 $ 189 22.9 % Non-accrual Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Non-accrual Status Impaired Loans on Non-accrual Status with No Related Allowance Impaired Loans on Non-accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 480 $ 80 $ 400 $ 29 $ 371 $ 103 38.1 % Commercial real estate mortgage—owner-occupied 133 15 118 20 98 38 39.8 Commercial real estate construction—owner-occupied 7 1 6 — 6 3 57.1 Total commercial 620 96 524 49 475 144 38.7 Commercial investor real estate mortgage 6 1 5 — 5 2 50.0 Commercial investor real estate construction 1 — 1 — 1 — — Total investor real estate 7 1 6 — 6 2 42.9 Residential first mortgage 42 11 31 — 31 3 33.3 Home equity 10 1 9 — 9 — 10.0 Total consumer 52 12 40 — 40 3 28.8 $ 679 $ 109 $ 570 $ 49 $ 521 $ 149 38.0 % Accruing Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Accrual Status Impaired Loans on Accrual Status with No Related Allowance Impaired Loans on Accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 154 $ 8 $ 146 $ 1 $ 145 $ 19 17.5 % Commercial real estate mortgage—owner-occupied 90 5 85 — 85 8 14.4 Commercial real estate construction—owner-occupied 1 — 1 — 1 — — Total commercial 245 13 232 1 231 27 16.3 Commercial investor real estate mortgage 63 2 61 — 61 3 7.9 Commercial investor real estate construction 29 — 29 — 29 3 10.3 Total investor real estate 92 2 90 — 90 6 8.7 Residential first mortgage 419 13 406 — 406 39 12.4 Home equity 251 1 250 — 250 5 2.4 Consumer credit card 1 — 1 — 1 — — Other consumer 9 — 9 — 9 — — Total consumer 680 14 666 — 666 44 8.5 $ 1,017 $ 29 $ 988 $ 1 $ 987 $ 77 10.4 % Total Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans Impaired Loans with No Related Allowance Impaired Loans with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 634 $ 88 $ 546 $ 30 $ 516 $ 122 33.1 % Commercial real estate mortgage—owner-occupied 223 20 203 20 183 46 29.6 Commercial real estate construction—owner-occupied 8 1 7 — 7 3 50.0 Total commercial 865 109 756 50 706 171 32.4 Commercial investor real estate mortgage 69 3 66 — 66 5 11.6 Commercial investor real estate construction 30 — 30 — 30 3 10.0 Total investor real estate 99 3 96 — 96 8 11.1 Residential first mortgage 461 24 437 — 437 42 14.3 Home equity 261 2 259 — 259 5 2.7 Consumer credit card 1 — 1 — 1 — — Other consumer 9 — 9 — 9 — — Total consumer 732 26 706 — 706 47 10.0 $ 1,696 $ 138 $ 1,558 $ 50 $ 1,508 $ 226 21.5 % ________ (1) Unpaid principal balance represents the contractual obligation due from the customer and includes the net book value plus charge-offs and payments applied. (2) Charge-offs and payments applied represents cumulative partial charge-offs taken, as well as interest payments received that have been applied against the outstanding principal balance. (3) Book value represents the unpaid principal balance less charge-offs and payments applied; it is shown before any allowance for loan losses. (4) Coverage % represents charge-offs and payments applied plus the related allowance as a percent of the unpaid principal balance. The following table presents the average balances of total impaired loans and interest income for the three months ended March 31, 2018 and 2017 . Interest income recognized represents interest on accruing loans modified in a TDR. Three Months Ended March 31 2018 2017 Average Balance Interest Income Recognized Average Balance Interest Income Recognized (In millions) Commercial and industrial $ 533 $ 3 $ 819 $ 2 Commercial real estate mortgage—owner-occupied 166 3 264 1 Commercial real estate construction—owner-occupied 6 — 6 — Total commercial 705 6 1,089 3 Commercial investor real estate mortgage 76 1 91 1 Commercial investor real estate construction 30 — 33 — Total investor real estate 106 1 124 1 Residential first mortgage 288 2 455 4 Home equity 252 3 295 4 Consumer credit card 1 — 2 — Other consumer 8 — 10 — Total consumer 549 5 762 8 Total impaired loans $ 1,360 $ 12 $ 1,975 $ 12 TROUBLED DEBT RESTRUCTURINGS Regions regularly modifies commercial and investor real estate loans in order to facilitate a workout strategy. Similarly, Regions works to meet the individual needs of consumer borrowers to stem foreclosure through its CAP. Refer to Note 6 "Allowance For Credit Losses" in the 2017 Annual Report on Form 10-K for additional information regarding the Company's TDRs. Further discussion related to TDRs, including their impact on the allowance for loan losses and designation of TDRs in periods subsequent to the modification is included in Note 1 "Summary of Significant Accounting Policies" in the 2017 Annual Report on Form 10-K. The following tables present the end of period balance for loans modified in a TDR during the periods presented by portfolio segment and class, and the financial impact of those modifications. The tables include modifications made to new TDRs, as well as renewals of existing TDRs. Loans first reported as TDRs during the three months ended March 31, 2018 and 2017 totaled approximately $171 million and $128 million , respectively. Three Months Ended March 31, 2018 Financial Impact Number of Recorded Increase in (Dollars in millions) Commercial and industrial 29 $ 164 $ 2 Commercial real estate mortgage—owner-occupied 18 14 — Total commercial 47 178 2 Commercial investor real estate mortgage 10 19 1 Total investor real estate 10 19 1 Residential first mortgage 53 8 1 Home equity 17 1 — Consumer credit card 14 — — Indirect—vehicles and other consumer 13 — — Total consumer 97 9 1 154 $ 206 $ 4 Three Months Ended March 31, 2017 Financial Impact Number of Recorded Increase in (Dollars in millions) Commercial and industrial 31 $ 99 $ 3 Commercial real estate mortgage—owner-occupied 31 28 1 Commercial real estate construction—owner-occupied 2 1 — Total commercial 64 128 4 Commercial investor real estate mortgage 12 19 — Commercial investor real estate construction 3 26 1 Total investor real estate 15 45 1 Residential first mortgage 49 8 1 Home equity 58 5 — Consumer credit card 19 — — Indirect—vehicles and other consumer 47 1 — Total consumer 173 14 1 252 $ 187 $ 6 TDRs that defaulted during the three months ended March 31, 2018 and 2017 , and that were modified in the previous twelve months (i.e., the twelve months prior to the default) were immaterial. At March 31, 2018, approximately $118 million of commercial and investor real estate loans modified in a TDR during the three months ended March 31, 2018 were on non-accrual status. At March 31, 2018 , Regions had restructured binding unfunded commitments totaling $21 million where a concession was granted and the borrower was in financial difficulty.

Servicing of Financial Assets

Servicing of Financial Assets	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Servicing of Financial Assets	SERVICING OF FINANCIAL ASSETS RESIDENTIAL MORTGAGE BANKING ACTIVITIES The fair value of residential MSRs is calculated using various assumptions including future cash flows, market discount rates, expected prepayment rates, servicing costs and other factors. A significant change in prepayments of mortgages in the servicing portfolio could result in significant changes in the valuation adjustments, thus creating potential volatility in the carrying amount of residential MSRs. The Company compares fair value estimates and assumptions to observable market data where available, and also considers recent market activity and actual portfolio experience. The table below presents an analysis of residential MSRs under the fair value measurement method: Three Months Ended March 31 2018 2017 (In millions) Carrying value, beginning of period $ 336 $ 324 Additions 8 8 Increase (decrease) in fair value: Due to change in valuation inputs or assumptions 22 4 Economic amortization associated with borrower repayments (1) (10 ) (10 ) Carrying value, end of period $ 356 $ 326 ________ (1) "Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. On April 28, 2017, the Company purchased the rights to service approximately $2.7 billion in residential mortgage loans for approximately $30 million . Data and assumptions used in the fair value calculation, as well as the valuation’s sensitivity to rate fluctuations, related to residential MSRs (excluding related derivative instruments) are as follows: March 31 2018 2017 (Dollars in millions) Unpaid principal balance $ 31,641 $ 30,960 Weighted-average CPR (%) 9.0 % 7.6 % Estimated impact on fair value of a 10% increase $ (24 ) $ (19 ) Estimated impact on fair value of a 20% increase $ (43 ) $ (34 ) Option-adjusted spread (basis points) 842 1,058 Estimated impact on fair value of a 10% increase $ (12 ) $ (13 ) Estimated impact on fair value of a 20% increase $ (24 ) $ (27 ) Weighted-average coupon interest rate 4.1 % 4.2 % Weighted-average remaining maturity (months) 280 280 Weighted-average servicing fee (basis points) 27.3 27.4 The sensitivity calculations above are hypothetical and should not be considered to be predictive of future performance. Changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, the effect of an adverse variation in a particular assumption on the fair value of residential MSRs is calculated without changing any other assumption, while in reality changes in one factor may result in changes in another, which may either magnify or counteract the effect of the change. The derivative instruments utilized by Regions would serve to reduce the estimated impacts to fair value included in the table above. The following table presents servicing related fees, which includes contractually specified servicing fees, late fees and other ancillary income resulting from the servicing of residential mortgage loans: Three Months Ended March 31 2018 2017 (In millions) Servicing related fees and other ancillary income $ 23 $ 23 Residential mortgage loans are sold in the secondary market with standard representations and warranties regarding certain characteristics such as the quality of the loan, the absence of fraud, the eligibility of the loan for sale and the future servicing associated with the loan. Regions may be required to repurchase these loans at par, or make-whole or indemnify the purchasers for losses incurred when representations and warranties are breached. Regions maintains an immaterial repurchase liability related to residential mortgage loans sold with representations and warranty provisions. This repurchase liability is reported in other liabilities on the consolidated balance sheets and reflects management’s estimate of losses based on historical repurchase and loss trends, as well as other factors that may result in anticipated losses different from historical loss trends. Adjustments to this reserve are recorded in other non-interest expense on the consolidated statements of income. COMMERCIAL MORTGAGE BANKING ACTIVITIES Regions is an approved DUS lender. The DUS program provides liquidity to the multi-family housing market. In connection with the DUS program, Regions services commercial loans, retains commercial MSRs and intangible assets associated with the DUS license, and assumes a loss share guarantee associated with the loans. See Note 1 "Summary of Significant Accounting Policies" in the 2017 Annual Report on Form 10-K for additional information. Also see Note 13 herein for additional information related to the guarantee. As of March 31, 2018 and December 31, 2017 , the DUS servicing portfolio was approximately $2.8 billion and $2.9 billion , respectively. The related commercial MSRs were valued at approximately $47 million and $48 million at March 31, 2018 and December 31, 2017 , respectively. The estimated fair value of the loss share guarantee was valued at approximately $4 million at both March 31, 2018 and December 31, 2017 .

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL Goodwill allocated to each reportable segment (each a reporting unit) is presented as follows: March 31, 2018 December 31, 2017 (In millions) Corporate Bank $ 2,474 $ 2,474 Consumer Bank 1,978 1,978 Wealth Management 452 452 $ 4,904 $ 4,904 Regions evaluates each reporting unit’s goodwill for impairment on an annual basis in the fourth quarter, or more often if events or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. A detailed description of the Company’s methodology and valuation approaches used to determine the estimated fair value of each reporting unit is included in the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2017. Adverse changes in the economic environment, declining operations, or other factors could result in a decline in the implied fair value of goodwill. During the first quarter of 2018, Regions assessed events and circumstances for all three reporting units as of March 31, 2018 , and through the date of the filing of this Quarterly Report on Form 10-Q that could potentially indicate goodwill impairment. The indicators assessed included: • Recent operating performance, • Changes in market capitalization, • Regulatory actions and assessments, • Changes in the business climate (including legislation, legal factors, and competition), • Company-specific factors (including changes in key personnel, asset impairments, and business dispositions), and • Trends in the banking industry. After assessing the indicators noted above, Regions determined that it was not more likely than not that the fair value of each of its reporting units had declined below their carrying value as of March 31, 2018 . Therefore, Regions determined that a test of goodwill impairment was not required for each of Regions’ reporting units for the March 31, 2018 interim period.

Stockholders' Equity and Accumu

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)	STOCKHOLDERS’ EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) PREFERRED STOCK The following table presents a summary of the non-cumulative perpetual preferred stock: March 31, 2018 December 31, 2017 Issuance Date Earliest Redemption Date Dividend Rate Liquidation Amount Carrying Amount Carrying Amount (Dollars in millions) Series A 11/1/2012 12/15/2017 6.375 % $ 500 $ 387 $ 387 Series B 4/29/2014 9/15/2024 6.375 % (1) 500 433 433 $ 1,000 $ 820 $ 820 _________ (1) Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375% , and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536% . For each preferred stock issuance listed above, Regions issued depositary shares, each representing a 1/40th ownership interest in a share of the Company's preferred stock, with a liquidation preference of $1,000.00 per share of preferred stock (equivalent to $25.00 per depositary share). Dividends on the preferred stock, if declared, accrue and are payable quarterly in arrears. The preferred stock has no stated maturity and redemption is solely at Regions' option, subject to regulatory approval, in whole, or in part, after the earliest redemption date or in whole, but not in part, within 90 days following a regulatory capital treatment event for the Series A preferred stock or at any time following a regulatory capital treatment event for the Series B preferred stock. The Board of Directors declared $8 million in cash dividends on both Series A and Series B Preferred Stock during the first three months of 2018 and 2017. In the event Series A and Series B preferred shares are redeemed at the liquidation amounts, $113 million and $67 million excess of the redemption amount over the carrying amount will be recognized, respectively. Approximately $100 million of Series A preferred dividends that were recorded as a reduction of preferred stock, including related surplus, will be recorded as a reduction to retained earnings, and approximately $13 million of related issuance costs that were recorded as a reduction of preferred stock, including related surplus, will be recorded as a reduction to net income available to common shareholders. Approximately $52 million of Series B preferred dividends that were recorded as a reduction of preferred stock, including related surplus, will be recorded as a reduction to retained earnings, and approximately $15 million of related issuance costs that were recorded as a reduction of preferred stock, including related surplus, will be recorded as a reduction to net income available to common shareholders. COMMON STOCK On June 28, 2017, Regions received no objection from the Federal Reserve to its 2017 capital plan that was submitted as part of the CCAR process, which included the repurchase of common shares and a common stock dividend increase. As part of the Company's capital plan, the Board authorized a new $1.47 billion common stock repurchase plan, permitting repurchases from the beginning of the third quarter of 2017 through the second quarter of 2018. The capital plan also included a proposed increase of the quarterly common stock dividend to $0.09 per common share beginning in the third quarter of 2017, subject to quarterly Board approval. The Board declared a $0.09 per share cash dividend on common stock for the first quarter of 2018 as compared to $0.065 per common share for the first quarter of 2017. As of March 31, 2018, Regions had repurchased approximately 78.1 million shares of common stock at a total cost of approximately $1.2 billion under this plan. The Company continued to repurchase shares under this plan in the second quarter of 2018, and as of May 8, 2018, Regions had additional repurchases of approximately 6.9 million shares of common stock at a total cost of approximately $129.1 million . All of these shares were immediately retired upon repurchase and therefore will not be included in treasury stock. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Activity within the balances in accumulated other comprehensive income (loss), net is shown in the following tables: Three Months Ended March 31, 2018 Unrealized losses on securities transferred to held to maturity Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Defined benefit pension plans and other post employment benefits Accumulated other comprehensive (In millions) Beginning of period $ (33 ) $ (153 ) $ (51 ) $ (512 ) $ (749 ) Net change 2 (310 ) (100 ) 6 (402 ) End of period $ (31 ) $ (463 ) $ (151 ) $ (506 ) $ (1,151 ) Three Months Ended March 31, 2017 Unrealized losses on securities transferred to held to maturity Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Defined benefit pension plans and other post employment benefits Accumulated other comprehensive (In millions) Beginning of period $ (33 ) $ (106 ) $ 11 $ (422 ) $ (550 ) Net change 2 1 (23 ) 5 (15 ) End of period $ (31 ) $ (105 ) $ (12 ) $ (417 ) $ (565 ) The following table presents amounts reclassified out of accumulated other comprehensive income (loss) for the three months ended March 31, 2018 and 2017 : Three Months Ended March 31, 2018 Three Months Ended March 31, 2017 Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) (1) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) (1) Affected Line Item in the Consolidated Statements of Income (In millions) Unrealized losses on securities transferred to held to maturity: $ (3 ) $ (3 ) Net interest income and other financing income 1 1 Tax (expense) or benefit $ (2 ) $ (2 ) Net of tax Unrealized gains and (losses) on available for sale securities: $ — $ — Securities gains (losses), net — — Tax (expense) or benefit $ — $ — Net of tax Gains and (losses) on cash flow hedges: Interest rate contracts $ 11 $ 31 Net interest income and other financing income (3 ) (12 ) Tax (expense) or benefit $ 8 $ 19 Net of tax Amortization of defined benefit pension plans and other post employment benefits: Actuarial gains (losses) $ (9 ) $ (9 ) (2) (9 ) (9 ) Total before tax 2 3 Tax (expense) or benefit $ (7 ) $ (6 ) Net of tax Total reclassifications for the period $ (1 ) $ 11 Net of tax ________ (1) Amounts in parentheses indicate reductions to net income. (2) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost and is included in other non-interest expense on the consolidated statements of income (see Note 9 for additional details).

Earnings (Loss) Per Common Shar

Earnings (Loss) Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings (Loss) Per Common Share	EARNINGS (LOSS) PER COMMON SHARE The following table sets forth the computation of basic earnings (loss) per common share and diluted earnings (loss) per common share: Three Months Ended March 31 2018 2017 (In millions, except per share amounts) Numerator: Income from continuing operations $ 414 $ 293 Preferred stock dividends (16 ) (16 ) Income from continuing operations available to common shareholders 398 277 Income (loss) from discontinued operations, net of tax — 8 Net income available to common shareholders $ 398 $ 285 Denominator: Weighted-average common shares outstanding—basic 1,127 1,209 Potential common shares 14 15 Weighted-average common shares outstanding—diluted 1,141 1,224 Earnings per common share from continuing operations available to common shareholders (1) : Basic $ 0.35 $ 0.23 Diluted 0.35 0.23 Earnings (loss) per common share from discontinued operations (1) : Basic $ 0.00 $ 0.01 Diluted 0.00 0.01 Earnings per common share (1) : Basic $ 0.35 $ 0.24 Diluted 0.35 0.23 ________ (1) Certain per share amounts may not appear to reconcile due to rounding. The effect from the assumed exercise of 6 million and 15 million stock options, restricted stock units and awards and performance stock units for the three months ended March 31, 2018 and 2017, respectively, was not included in the above computations of diluted earnings per common share because such amounts would have had an antidilutive effect on earnings per common share.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Pension and Other Postretirement Benefits	PENSION AND OTHER POSTRETIREMENT BENEFITS Regions' defined benefit pension plans cover only certain employees as the pension plans are closed to new entrants. The Company also sponsors a SERP, which is a non-qualified pension plan that provides certain senior executive officers defined benefits in relation to their compensation. Net periodic pension cost (credit) includes the following components: Qualified Plans Non-qualified Plans Total Three Months Ended March 31 2018 2017 2018 2017 2018 2017 (In millions) Service cost $ 9 $ 8 $ 1 $ 1 $ 10 $ 9 Interest cost 18 18 1 1 19 19 Expected return on plan assets (37 ) (35 ) — — (37 ) (35 ) Amortization of actuarial loss 8 8 1 1 9 9 Net periodic pension cost (credit) $ (2 ) $ (1 ) $ 3 $ 3 $ 1 $ 2 The service cost component of net periodic pension cost is recorded in salaries and employee benefits on the consolidated statements of income. Components other than service cost are recorded in other non-interest expense on the consolidated statements of income. Regions' funding policy for the qualified plans is to contribute annually at least the amount required by IRS minimum funding standards. Regions made a contribution of $100 million for the 2017 plan year during the first quarter of 2018. Regions also provides other postretirement benefits such as defined benefit health care plans and life insurance plans that cover certain retired employees. There was no material impact from other postretirement benefits on the consolidated financial statements for the three months ended March 31, 2018 or 2017 .

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments and Hedging Activities	DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES The following tables present the notional amount and estimated fair value of derivative instruments on a gross basis as of March 31, 2018 and December 31, 2017 . Beginning in the first quarter of 2018, variation margin payments made for derivatives cleared through LCH Limited are legally characterized as settlements of the derivatives. Exchange traded derivatives cleared through LCH Limited were not offset prior to January 2018. March 31, 2018 December 31, 2017 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Gain (1) Loss (1) Gain (1) Loss (1) (In millions) Derivatives in fair value hedging relationships: Interest rate swaps $ 3,597 $ 3,060 $ 1 $ 43 Derivatives in cash flow hedging relationships: Interest rate swaps 7,825 6,825 5 188 Total derivatives designated as hedging instruments $ 11,422 $ 9,885 $ 6 $ 231 Derivatives not designated as hedging instruments: Interest rate swaps $ 41,166 $ 140 $ 307 $ 40,841 $ 308 $ 342 Interest rate options 5,063 39 23 4,598 23 15 Interest rate futures and forward commitments 42,341 10 11 20,404 6 5 Other contracts 6,066 59 55 5,721 51 48 Total derivatives not designated as hedging instruments $ 94,636 $ 248 $ 396 $ 71,564 $ 388 $ 410 Total derivatives $ 106,058 $ 248 $ 396 $ 81,449 $ 394 $ 641 Total gross derivative instruments, before netting $ 248 $ 396 $ 394 $ 641 Less: Legally enforceable master netting agreements 112 112 107 107 Less: Cash collateral received/posted 30 113 34 131 Total gross derivative instruments, after netting (2) $ 106 $ 171 $ 253 $ 403 _________ (1) Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities on the consolidated balance sheets. There is no fair value presented for contracts that are characterized as settled daily. (2) As of March 31, 2018, financial instruments posted of $49 million were not offset in the consolidated balance sheets. As of December 31, 2017, cash collateral posted of $257 million and financial instruments posted of $50 million were not offset in the consolidated balance sheets. HEDGING DERIVATIVES Derivatives entered into to manage interest rate risk and facilitate asset/liability management strategies are designated as hedging derivatives. Derivative financial instruments that qualify in a hedging relationship are classified, based on the exposure being hedged, as either fair value hedges or cash flow hedges. See Note 1 "Summary of Significant Accounting Policies" of the Annual Report on Form 10-K for the year ended December 31, 2017 , for additional information regarding accounting policies for derivatives. FAIR VALUE HEDGES Fair value hedge relationships mitigate exposure to the change in fair value of an asset, liability or firm commitment. Regions enters into interest rate swap agreements to manage interest rate exposure on the Company’s fixed-rate borrowings, which includes long-term debt and certificates of deposit. These agreements involve the receipt of fixed-rate amounts in exchange for floating-rate interest payments over the life of the agreements. Regions enters into interest rate swap agreements to manage interest rate exposure on certain of the Company's fixed-rate available for sale debt securities. These agreements involve the payment of fixed-rate amounts in exchange for floating-rate interest receipts. CASH FLOW HEDGES Cash flow hedge relationships mitigate exposure to the variability of future cash flows or other forecasted transactions. Regions enters into interest rate swap agreements to manage overall cash flow changes related to interest rate risk exposure on LIBOR-based loans. The agreements effectively modify the Company’s exposure to interest rate risk by utilizing receive fixed/pay LIBOR interest rate swaps. Regions recognized an unrealized after-tax gain of $136 million and $154 million in accumulated other comprehensive income (loss) at March 31, 2018 and 2017 , respectively, related to terminated cash flow hedges of loan instruments, which will be amortized into earnings in conjunction with the recognition of interest payments through 2025. Regions recognized pre-tax income of $15 million and $19 million during the three months ended March 31, 2018 and 2017 , respectively related to the amortization of discontinued cash flow hedges of loan instruments. Regions expects to reclassify out of accumulated other comprehensive income (loss) and into earnings approximately $4 million in pre-tax income due to the receipt or payment of interest payments on all cash flow hedges within the next twelve months. Included in this amount is $50 million in pre-tax net income related to the amortization of discontinued cash flow hedges. The maximum length of time over which Regions is hedging its exposure to the variability in future cash flows for forecasted transactions is approximately seven years as of March 31, 2018 , and a portion of these hedges are forward starting. The following tables present the effect of hedging derivative instruments on the consolidated statements of income: Three Months Ended March 31, 2018 Interest Income Interest Expense Non-interest expense Debt securities-taxable Loans, including fees Deposits Long-term borrowings Other Total amounts presented in the consolidated statements of income $ 154 $ 851 $ 49 $ 72 $ 225 Gains/(losses) on fair value hedging relationships: Interest rate contracts: Amounts related to interest settlements on derivatives $ — $ — $ — $ (1 ) $ — Recognized on derivatives 3 — — (32 ) — Recognized on hedged items (3 ) — — 32 — Net income (expense) recognized on fair value hedges $ — $ — $ — $ (1 ) $ — Gains/(losses) on cash flow hedging relationships: (1) Interest rate contracts: Realized gains (losses) reclassified from AOCI into net income (2) $ — $ 11 $ — $ — $ — Net income (expense) recognized on cash flow hedges $ — $ 11 $ — $ — $ — Three Months Ended March 31, 2017 Interest Income Interest Expense Non-interest expense Securities-taxable Loans, including fees Deposits Long-term borrowings Other Total amounts presented in the consolidated statements of income $ 147 $ 773 $ 35 $ 50 $ 220 Gains/(losses) on fair value hedging relationships: Interest rate contracts: Amounts related to interest settlements on derivatives $ (1 ) $ — $ — $ 1 $ — Recognized on derivatives — — — — — Recognized on hedged items — — — — — Net income (expense) recognized on fair value hedges $ (1 ) $ — $ — $ 1 $ — Gains/(losses) on cash flow hedging relationships: (1) Interest rate contracts: Realized gains (losses) reclassified from AOCI into net income (2) $ — $ 31 $ — $ — $ — Net income (expense) recognized on cash flow hedges $ — $ 31 $ — $ — $ — _____ (1) See Note 7 for gain or (loss) recognized for cash flow hedges in AOCI. (2) Pre-tax The following table presents the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. March 31, 2018 Hedged Items Currently Designated Hedged Items No Longer Designated Carrying Amount of Assets/(Liabilities) Hedge Accounting Basis Adjustment Assets/(Liabilities) Carrying Amount of Assets/(Liabilities) Hedge Accounting Basis Adjustment Assets/(Liabilities) (In millions) Debt securities available for sale $ 210 $ (3 ) $ 577 $ 7 Long-term borrowings (3,321 ) 82 (101 ) — DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS The Company holds a portfolio of interest rate swaps, option contracts, and futures and forward commitments that result from transactions with its commercial customers in which they manage their risks by entering into a derivative with Regions. The Company monitors and manages the net risk in this customer portfolio and enters into separate derivative contracts in order to reduce the overall exposure to pre-defined limits. For both derivatives with its end customers and derivatives Regions enters into to mitigate the risk in this portfolio, the Company is subject to market risk and the risk that the counterparty will default. The contracts in this portfolio are not designated as accounting hedges and are marked-to market through earnings (in capital markets fee income and other) and included in other assets and other liabilities, as appropriate. Regions enters into interest rate lock commitments, which are commitments to originate mortgage loans whereby the interest rate on the loan is determined prior to funding and the customers have locked into that interest rate. At March 31, 2018 and December 31, 2017 , Regions had $372 million and $197 million , respectively, in total notional amount of interest rate lock commitments. Regions manages market risk on interest rate lock commitments and mortgage loans held for sale with corresponding forward sale commitments. Residential mortgage loans held for sale are recorded at fair value with changes in fair value recorded in mortgage income. Commercial mortgage loans held for sale are recorded at either the lower of cost or market or at fair value based on management's election. At March 31, 2018 and December 31, 2017 , Regions had $737 million and $481 million , respectively, in total notional amounts related to these forward sale commitments. Changes in mark-to-market from both interest rate lock commitments and corresponding forward sale commitments related to residential mortgage loans are included in mortgage income. Changes in mark-to-market from both interest rate lock commitments and corresponding forward sale commitments related to commercial mortgage loans are included in capital markets fee income and other. Regions has elected to account for residential MSRs at fair value with any changes to fair value being recorded within mortgage income. Concurrent with the election to use the fair value measurement method, Regions began using various derivative instruments, in the form of forward rate commitments, futures contracts, swaps and swaptions to mitigate the effect of changes in the fair value of its residential MSRs in its consolidated statements of income. As of March 31, 2018 and December 31, 2017 , the total notional amount related to these contracts was $5.0 billion and $4.8 billion , respectively. The following table presents the location and amount of gain or (loss) recognized in income on derivatives not designated as hedging instruments in the consolidated statements of income for the three months ended March 31, 2017 and 2017 : Three Months Ended March 31 Derivatives Not Designated as Hedging Instruments 2018 2017 (In millions) Capital markets fee income and other (1) : Interest rate swaps $ 7 $ 2 Interest rate options 7 2 Interest rate futures and forward commitments 1 2 Other contracts 2 (8 ) Total capital markets fee income and other 17 (2 ) Mortgage income: Interest rate swaps (18 ) (2 ) Interest rate options 3 2 Interest rate futures and forward commitments (3 ) (8 ) Total mortgage income (18 ) (8 ) $ (1 ) $ (10 ) ______ (1) Capital markets fee income and other is included in Other income on the consolidated statements of income. Credit risk, defined as all positive exposures not collateralized with cash or other assets or reserved for, at March 31, 2018 and December 31, 2017 , totaled approximately $94 million and $251 million , respectively. These amounts represent the net credit risk on all trading and other derivative positions held by Regions. CREDIT DERIVATIVES Regions has both bought and sold credit protection in the form of participations on interest rate swaps (swap participations). These swap participations, which meet the definition of credit derivatives, were entered into in the ordinary course of business to serve the credit needs of customers. Swap participations, whereby Regions has purchased credit protection, entitle Regions to receive a payment from the counterparty if the customer fails to make payment on any amounts due to Regions upon early termination of the swap transaction and have maturities between 2018 and 2024. Swap participations, whereby Regions has sold credit protection have maturities between 2018 and 2025. For contracts where Regions sold credit protection, Regions would be required to make payment to the counterparty if the customer fails to make payment on any amounts due to the counterparty upon early termination of the swap transaction. Regions bases the current status of the prepayment/performance risk on bought and sold credit derivatives on recently issued internal risk ratings consistent with the risk management practices of unfunded commitments. Regions’ maximum potential amount of future payments under these contracts as of March 31, 2018 was approximately $400 million . This scenario would only occur if variable interest rates were at zero percent and all counterparties defaulted with zero recovery. The fair value of sold protection at March 31, 2018 and 2017 was immaterial. In transactions where Regions has sold credit protection, recourse to collateral associated with the original swap transaction is available to offset some or all of Regions’ obligation. Regions has bought credit protection in the form of credit default indices. These indices, which meet the definition of credit derivatives, were entered into in the ordinary course of business to economically hedge credit spread risk in commercial mortgage loans held for sale whereby the fair value option has been elected. Credit derivatives, whereby Regions has purchased credit protection, entitle Regions to receive a payment from the counterparty if losses on the underlying index exceed a certain threshold, dependent upon the tranche rating of the capital structure. CONTINGENT FEATURES Certain of Regions’ derivative instrument contracts with broker-dealers contain credit-related termination provisions and/or credit-related provisions regarding the posting of collateral, allowing those broker-dealers to terminate the contracts in the event that Regions’ and/or Regions Bank’s credit ratings falls below specified ratings from certain major credit rating agencies. The aggregate fair values of all derivative instruments with any credit-risk-related contingent features that were in a liability position on March 31, 2018 and December 31, 2017 , were $71 million and $91 million , respectively, for which Regions had posted collateral of $74 million and $90 million , respectively, in the normal course of business.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS See Note 1 “Summary of Significant Accounting Policies” to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2017 for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis. Assets and liabilities measured at fair value rarely transfer between Level 1 and Level 2 measurements. There were no such transfers during the three month periods ended March 31, 2018 and 2017 . Marketable equity securities and debt securities available for sale may be periodically transferred to or from Level 3 valuation based on management’s conclusion regarding the observability of inputs used in valuing the securities. Such transfers are accounted for as if they occur at the beginning of a reporting period. The following table presents assets and liabilities measured at estimated fair value on a recurring basis and non-recurring basis as of March 31, 2018 and December 31, 2017 : March 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 (1) Total Estimated Fair Value Level 1 Level 2 Level 3 (1) Total Estimated Fair Value (In millions) Recurring fair value measurements Debt securities available for sale: U.S. Treasury securities $ 327 $ — $ — $ 327 $ 331 $ — $ — $ 331 Federal agency securities — 42 — 42 — 28 — 28 Mortgage-backed securities (MBS): Residential agency — 17,152 — 17,152 — 17,431 — 17,431 Residential non-agency — — 2 2 — — 3 3 Commercial agency — 3,661 — 3,661 — 3,714 — 3,714 Commercial non-agency — 766 — 766 — 788 — 788 Corporate and other debt securities — 1,132 3 1,135 — 1,105 3 1,108 Total debt securities available for sale $ 327 $ 22,753 $ 5 $ 23,085 $ 331 $ 23,066 $ 6 $ 23,403 Loans held for sale $ — $ 282 $ — $ 282 $ — $ 325 $ — $ 325 Marketable equity securities (2) $ 525 $ — $ — $ 525 $ 414 $ — $ — $ 414 Residential mortgage servicing rights $ — $ — $ 356 $ 356 $ — $ — $ 336 $ 336 Derivative assets: Interest rate swaps $ — $ 140 $ — $ 140 $ — $ 314 $ — $ 314 Interest rate options — 26 13 39 — 18 5 23 Interest rate futures and forward commitments — 10 — 10 — 6 — 6 Other contracts 2 57 — 59 2 49 — 51 Total derivative assets $ 2 $ 233 $ 13 $ 248 $ 2 $ 387 $ 5 $ 394 Derivative liabilities: Interest rate swaps $ — $ 307 $ — $ 307 $ — $ 573 $ — $ 573 Interest rate options — 23 — 23 — 15 — 15 Interest rate futures and forward commitments — 11 — 11 — 5 — 5 Other contracts 2 53 — 55 2 46 — 48 Total derivative liabilities $ 2 $ 394 $ — $ 396 $ 2 $ 639 $ — $ 641 Non-recurring fair value measurements Loans held for sale $ — $ — $ 7 $ 7 $ — $ — $ 20 $ 20 Equity investments without a readily determinable fair value (3) — — 13 13 — — — — Foreclosed property and other real estate — 18 4 22 — 24 9 33 _________ (1) All following disclosures related to Level 3 recurring and non-recurring assets do not include those deemed to be immaterial. (2) Marketable equity securities were reclassified from trading account securities and securities available for sale to other earning assets, beginning in the first quarter of 2018, with the adoption of new accounting guidance. Prior periods have been reclassified to conform to current period presentation. (3) With the adoption of new accounting guidance, effective January 1, 2018, equity investments without a readily determinable fair value are required to be adjusted prospectively to estimated fair value when an observable price transaction for a same or similar investment with the same issuer occurs. Assets and liabilities in all levels could result in volatile and material price fluctuations. Realized and unrealized gains and losses on Level 3 assets represent only a portion of the risk to market fluctuations in Regions’ consolidated balance sheets. Further, derivatives included in Levels 2 and 3 are used by ALCO in a holistic approach to managing price fluctuation risks. The following tables illustrate rollforwards for all material assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2018 and 2017 , respectively. The net changes in realized gains (losses) included in earnings related to Level 3 assets and liabilities held at March 31, 2018 and 2017 are not material. Three Months Ended March 31, 2018 Opening Total Realized / Unrealized Gains or Losses Purchases Sales Issuances Settlements Transfers Transfers Closing Included in Earnings Included in Other Compre- hensive Income (Loss) (In millions) Level 3 Instruments Only Residential mortgage servicing rights $ 336 12 (1) — 8 — — — — — $ 356 Three Months Ended March 31, 2017 Opening Total Realized / Unrealized Gains or Losses Purchases Sales Issuances Settlements Transfers into Level 3 Transfers out of Level 3 Closing Included in Earnings Included in Other Compre- hensive Income (Loss) (In millions) Level 3 Instruments Only Residential mortgage servicing rights $ 324 (6 ) (1) — 8 — — — — — $ 326 _________ (1) Included in mortgage income. The following table presents the fair value adjustments related to non-recurring fair value measurements: Three Months Ended March 31 2018 2017 (In millions) Loans held for sale $ (3 ) $ (4 ) Foreclosed property and other real estate (5 ) (4 ) Equity investments without a readily determinable fair value 7 — The following tables present detailed information regarding material assets and liabilities measured at fair value using significant unobservable inputs (Level 3) as of March 31, 2018 , and December 31, 2017 . The tables include the valuation techniques and the significant unobservable inputs utilized. The range of each significant unobservable input as well as the weighted-average within the range utilized at March 31, 2018 , and December 31, 2017 , are included. Following the tables are descriptions of the valuation techniques and the sensitivity of the techniques to changes in the significant unobservable inputs. March 31, 2018 Level 3 Valuation Technique Unobservable Input(s) Quantitative Range of Unobservable Inputs and (Weighted-Average) (Dollars in millions) Recurring fair value measurements: Residential mortgage servicing rights (1) $356 Discounted cash flow Weighted-average CPR (%) 3.6% - 28.0% (9.0%) OAS (%) 7.8% - 15.0% (8.4%) _________ (1) See Note 5 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights. December 31, 2017 Level 3 Valuation Technique Unobservable Input(s) Quantitative Range of Unobservable Inputs and (Weighted-Average) (Dollars in millions) Recurring fair value measurements: Residential mortgage servicing rights (1) $336 Discounted cash flow Weighted-average CPR (%) 7.9% - 28.1% (9.9%) OAS (%) 8.1% - 15.0% (8.6%) _________ (1) See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2017 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights. RECURRING FAIR VALUE MEASUREMENTS USING SIGNIFICANT UNOBSERVABLE INPUTS Residential mortgage servicing rights The significant unobservable inputs used in the fair value measurement of residential MSRs are OAS and CPR. This valuation requires generating cash flow projections over multiple interest rate scenarios and discounting those cash flows at a risk-adjusted rate. Additionally, the impact of prepayments and changes in the OAS are based on a variety of underlying inputs including servicing costs. Increases or decreases to the underlying cash flow inputs will have a corresponding impact on the value of the MSR asset. The net change in unrealized gains (losses) included in earnings related to MSRs held at period end are disclosed as the changes in valuation inputs or assumptions included in the MSR rollforward table in Note 5. See Note 5 for these amounts and additional disclosures related to assumptions used in the fair value calculation for MSRs. FAIR VALUE OPTION Regions has elected the fair value option for all FNMA and FHLMC eligible residential mortgage loans and certain commercial mortgage loans originated with the intent to sell. These elections allow for a more effective offset of the changes in fair values of the loans and the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting. Regions has not elected the fair value option for other loans held for sale primarily because they are not economically hedged using derivative instruments. Fair values of residential mortgage loans held for sale are based on traded market prices of similar assets where available and/or discounted cash flows at market interest rates, adjusted for securitization activities that include servicing values and market conditions, and are recorded in loans held for sale in the consolidated balance sheets. The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value: March 31, 2018 December 31, 2017 Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal (In millions) Mortgage loans held for sale, at fair value $ 282 $ 273 $ 9 $ 325 $ 314 $ 11 Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest income on loans held for sale in the consolidated statements of income. The following table details net gains and losses resulting from changes in fair value of these loans, which were recorded in mortgage income in the consolidated statements of income during the three months ended March 31, 2018 and 2017 . These changes in fair value are mostly offset by economic hedging activities. An immaterial portion of these amounts was attributable to changes in instrument-specific credit risk. Net gains (losses) resulting from changes in fair value Three Months Ended March 31 2018 2017 (In millions) Mortgage loans held for sale, at fair value $ (3 ) $ 4 The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments as of March 31, 2018 are as follows: March 31, 2018 Carrying Amount Estimated Fair Value (1) Level 1 Level 2 Level 3 (In millions) Financial assets: Cash and cash equivalents $ 3,185 $ 3,185 $ 3,185 $ — $ — Debt securities held to maturity 1,611 1,585 — 1,585 — Debt securities available for sale 23,085 23,085 327 22,753 5 Loans held for sale 452 452 — 439 13 Loans (excluding leases), net of unearned income and allowance for loan losses (2)(3) 77,917 76,683 — — 76,683 Other earning assets (4) 1,190 1,190 525 665 — Derivative assets 248 248 2 233 13 Financial liabilities: Derivative liabilities 396 396 2 394 — Deposits 96,990 97,015 — 97,015 — Long-term borrowings 7,949 8,239 — 7,814 425 Loan commitments and letters of credit 77 413 — — 413 _________ (1) Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred. (2) The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at March 31, 2018 was $1.2 billion or 1.6 percent. (3) Excluded from this table is the capital lease carrying amount of $1.1 billion at March 31, 2018 . (4) Excluded from this table is the operating lease carrying amount of $ 450 million at March 31, 2018 . The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company's financial instruments as of December 31, 2017 are as follows: December 31, 2017 Carrying Amount Estimated Fair Value (1) Level 1 Level 2 Level 3 (In millions) Financial assets: Cash and cash equivalents $ 3,981 $ 3,981 $ 3,981 $ — $ — Debt securities held to maturity 1,658 1,667 — 1,667 — Debt securities available for sale 23,403 23,403 331 23,066 6 Loans held for sale 348 348 — 328 20 Loans (excluding leases), net of unearned income and allowance for loan losses (2)(3) 77,942 76,871 — — 76,871 Other earning assets (4) 1,402 1,402 414 988 — Derivative assets 394 394 2 387 5 Financial liabilities: Derivative liabilities 641 641 2 639 — Deposits 96,889 96,927 — 96,927 — Long-term borrowings 8,132 8,517 — 7,757 760 Loan commitments and letters of credit 79 540 — — 540 _________ (1) Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred. (2) The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at December 31, 2017 was $1.1 billion or 1.4 percent. (3) Excluded from this table is the capital lease carrying amount of $1.1 billion at December 31, 2017 . (4) Excluded from this table is the operating lease carrying amount of $489 million at December 31, 2017 .

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Business Segment Information	BUSINESS SEGMENT INFORMATION Each of Regions’ reportable segments is a strategic business unit that serves specific needs of Regions’ customers based on the products and services provided. The segments are based on the manner in which management views the financial performance of the business. The Company has three reportable segments: Corporate Bank, Consumer Bank, and Wealth Management, with the remainder split between Discontinued Operations and Other. Additional information about the Company's reportable segments is included in Regions' Annual Report on Form 10-K for the year ended December 31, 2017. The application and development of management reporting methodologies is a dynamic process and is subject to periodic enhancements. As these enhancements are made, financial results presented by each reportable segment may be periodically revised. Discontinued operations includes all brokerage and investment activities associated with the sale of Morgan Keegan which closed on April 2, 2012, as well as the pending sale of Regions Insurance Group, Inc. and related affiliates. See Note 2 for related discussion. The following tables present financial information for each reportable segment for the period indicated. Three Months Ended March 31, 2018 Corporate Bank Consumer Bank Wealth Management Other Continuing Operations Discontinued Operations Consolidated (In millions) Net interest income and other financing income (loss) $ 340 $ 542 $ 49 $ (22 ) $ 909 $ — $ 909 Provision (credit) for loan losses 55 76 4 (145 ) (10 ) — (10 ) Non-interest income 144 276 77 10 507 34 541 Non-interest expense 233 523 91 37 884 34 918 Income (loss) before income taxes 196 219 31 96 542 — 542 Income tax expense (benefit) 49 55 8 16 128 — 128 Net income (loss) $ 147 $ 164 $ 23 $ 80 $ 414 $ — $ 414 Average assets $ 51,037 $ 35,011 $ 2,359 $ 34,917 $ 123,324 $ 170 $ 123,494 Three Months Ended March 31, 2017 Corporate Bank Consumer Bank Wealth Management Other Continuing Operations Discontinued Operations Consolidated (In millions) Net interest income and other financing income (loss) $ 341 $ 518 $ 46 $ (46 ) $ 859 $ — $ 859 Provision (credit) for loan losses 67 74 5 (76 ) 70 — 70 Non-interest income 123 275 74 2 474 36 510 Non-interest expense 214 513 84 32 843 23 866 Income (loss) before income taxes 183 206 31 — 420 13 433 Income tax expense (benefit) 69 78 12 (32 ) 127 5 132 Net income (loss) $ 114 $ 128 $ 19 $ 32 $ 293 $ 8 $ 301 Average assets $ 52,340 $ 35,047 $ 2,518 $ 34,747 $ 124,652 $ 158 $ 124,810

Commitments, Contingencies and

Commitments, Contingencies and Guarantees	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Guarantees	COMMITMENTS, CONTINGENCIES AND GUARANTEES COMMERCIAL COMMITMENTS Regions issues off-balance sheet financial instruments in connection with lending activities. The credit risk associated with these instruments is essentially the same as that involved in extending loans to customers and is subject to Regions’ normal credit approval policies and procedures. Regions measures inherent risk associated with these instruments by recording a reserve for unfunded commitments based on an assessment of the likelihood that the guarantee will be funded and the creditworthiness of the customer or counterparty. Collateral is obtained based on management’s assessment of the creditworthiness of the customer. Credit risk associated with these instruments is represented by the contractual amounts indicated in the following table: March 31, 2018 December 31, 2017 (In millions) Unused commitments to extend credit $ 46,328 $ 45,705 Standby letters of credit 1,436 1,348 Commercial letters of credit 76 76 Liabilities associated with standby letters of credit 28 26 Assets associated with standby letters of credit 29 28 Reserve for unfunded credit commitments 49 53 Unused commitments to extend credit —To accommodate the financial needs of its customers, Regions makes commitments under various terms to lend funds to consumers, businesses and other entities. These commitments include (among others) credit card and other revolving credit agreements, term loan commitments and short-term borrowing agreements. Many of these loan commitments have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of these commitments are expected to expire without being funded, the total commitment amounts do not necessarily represent future liquidity requirements. Standby letters of credit —Standby letters of credit are also issued to customers, which commit Regions to make payments on behalf of customers if certain specified future events occur. Regions has recourse against the customer for any amount required to be paid to a third party under a standby letter of credit. Historically, a large percentage of standby letters of credit expire without being funded. The contractual amount of standby letters of credit represents the maximum potential amount of future payments Regions could be required to make and represents Regions’ maximum credit risk. Commercial letters of credit —Commercial letters of credit are issued to facilitate foreign or domestic trade transactions for customers. As a general rule, drafts will be drawn when the goods underlying the transaction are in transit. LEGAL CONTINGENCIES Regions and its subsidiaries are subject to loss contingencies related to litigation, claims, investigations and legal and administrative cases and proceedings arising in the ordinary course of business. Regions evaluates these contingencies based on information currently available, including advice of counsel. Regions establishes accruals for those matters when a loss contingency is considered probable and the related amount is reasonably estimable. Any accruals are periodically reviewed and may be adjusted as circumstances change. Some of Regions' exposure with respect to loss contingencies may be offset by applicable insurance coverage. In determining the amounts of any accruals or estimates of possible loss contingencies however, Regions does not take into account the availability of insurance coverage. To the extent that Regions has an insurance recovery, the proceeds are recorded in the period the recovery is received. In addition, Regions has agreed to indemnify Raymond James for all legal matters resulting from pre-closing activities in conjunction with the sale of Morgan Keegan and recorded an indemnification obligation at fair value in the second quarter of 2012. When it is practicable, Regions estimates possible loss contingencies, whether or not there is an accrued probable loss. When Regions is able to estimate such possible losses, and when it is reasonably possible Regions could incur losses in excess of amounts accrued, Regions discloses the aggregate estimation of such possible losses. Regions currently estimates that any such losses in excess of amounts accrued, including legal contingencies that are subject to the indemnification agreement with Raymond James, would be immaterial to Regions' financial statements as a whole. However, as available information changes, the matters for which Regions is able to estimate, as well as the estimates themselves will be adjusted accordingly. Assessments of litigation and claims exposure are difficult because they involve inherently unpredictable factors including, but not limited to, the following: whether the proceeding is in the early stages; whether damages are unspecified, unsupported, or uncertain; whether there is a potential for punitive or other pecuniary damages; whether the matter involves legal uncertainties, including novel issues of law; whether the matter involves multiple parties and/or jurisdictions; whether discovery has begun or is not complete; whether meaningful settlement discussions have commenced; and whether the lawsuit involves class allegations. Assessments of class action litigation, which is generally more complex than other types of litigation, are particularly difficult, especially in the early stages of the proceeding when it is not known whether a class will be certified or how a potential class, if certified, will be defined. As a result, Regions may be unable to estimate reasonably possible losses with respect to some of the matters disclosed below, and the aggregated estimated amount discussed above may not include an estimate for every matter disclosed below. In July 2006, Morgan Keegan and a former Morgan Keegan analyst were named as defendants in a lawsuit filed by a Canadian insurance and financial services company and its American subsidiary in the Circuit Court of Morris County, New Jersey. Plaintiffs alleged civil claims under the RICO Act and claims for commercial disparagement, tortious interference with contractual relationships, tortious interference with prospective economic advantage and common law conspiracy. Plaintiffs allege that defendants engaged in a multi-year conspiracy to publish and disseminate false and defamatory information about plaintiffs to improperly drive down plaintiffs’ stock price, so that others could profit from short positions. Plaintiffs allege that defendants’ actions damaged their reputations and harmed their business relationships. Plaintiffs seek monetary damages for a number of categories of alleged damages, including lost insurance business, lost financings and increased financing costs, increased audit fees and directors and officers insurance premiums and lost acquisitions. In September 2012, the trial court dismissed the case with prejudice. Plaintiffs filed an appeal, and in April 2017, the appellate court affirmed the dismissal of the plaintiffs’ claims under the RICO Act. The appellate court reversed the trial court’s dismissal of the commercial disparagement and tortious interference claims and remanded those claims but limited the plaintiffs’ damages. Plaintiffs filed an appeal with the Supreme Court of New Jersey in May 2017, and in October 2017, that court denied the plaintiffs' petition and remanded the case to the trial court. A trial date has been set for early June 2018. This matter is subject to the indemnification agreement with Raymond James. Regions is involved in formal and informal information-gathering requests, investigations, reviews, examinations and proceedings by various governmental regulatory agencies, law enforcement authorities and self-regulatory bodies regarding Regions’ business, Regions' business practices and policies, and the conduct of persons with whom Regions does business. Additional inquiries will arise from time to time. In connection with those inquiries, Regions receives document requests, subpoenas and other requests for information. The inquiries, including those described below, could develop into administrative, civil or criminal proceedings or enforcement actions that could result in consequences that have a material effect on Regions' consolidated financial position, results of operations or cash flows as a whole. Such consequences could include adverse judgments, findings, settlements, penalties, fines, orders, injunctions, restitution, or alterations in our business practices, and could result in additional expenses and collateral costs, including reputational damage. Regions is cooperating with an investigation by the United States Attorney’s Office for the Eastern District of New York pertaining to Regions' banking relationship with a former customer and accounts maintained by related entities and individuals affiliated with the customer who may be involved in criminal activity, as well as related aspects of Regions' Anti-Money Laundering and Bank Secrecy Act compliance program. While the final outcome of litigation and claims exposures or of any inquiries is inherently unpredictable, management is currently of the opinion that the outcome of pending and threatened litigation and inquiries will not have a material effect on Regions’ business, consolidated financial position, results of operations or cash flows as a whole. However, in the event of unexpected future developments, it is reasonably possible that an adverse outcome in any of the matters discussed above could be material to Regions’ business, consolidated financial position, results of operations or cash flows for any particular reporting period of occurrence. GUARANTEES INDEMNIFICATION OBLIGATION As discussed in Note 2, on April 2, 2012 (“Closing Date”), Regions closed the sale of Morgan Keegan and related affiliates to Raymond James. In connection with the sale, Regions agreed to indemnify Raymond James for all legal matters related to pre-closing activities, including matters filed subsequent to the Closing Date that relate to actions that occurred prior to closing. Losses under the indemnification include legal and other expenses, such as costs for judgments, settlements and awards associated with the defense and resolution of the indemnified matters. The maximum potential amount of future payments that Regions could be required to make under the indemnification is indeterminable due to the indefinite term of some of the obligations. As of March 31, 2018 , the carrying value and fair value of the indemnification obligation were immaterial. FANNIE MAE DUS LOSS SHARE GUARANTEE Regions is a DUS lender. The DUS program provides liquidity to the multi-family housing market. Regions services loans sold to Fannie Mae and is required to provide a loss share guarantee equal to one-third of the majority of its DUS servicing portfolio. At March 31, 2018 and December 31, 2017 , the Company's DUS servicing portfolio totaled approximately $2.8 billion and $2.9 billion , respectively. Regions' maximum quantifiable contingent liability related to its loss share guarantee was approximately $915 million and $923 million at March 31, 2018 and December 31, 2017 , respectively. The Company would be liable for this amount only if all of the loans it services for Fannie Mae, for which the Company retains some risk of loss, were to default and all of the collateral underlying these loans was determined to be without value at the time of settlement. Therefore, the maximum quantifiable contingent liability is not representative of the actual loss the Company would be expected to incur. The estimated fair value of the associated loss share guarantee recorded as a liability on the Company's consolidated balance sheets was approximately $4 million at both March 31, 2018 and December 31, 2017 . Refer to Note 1 "Summary of Significant Accounting Policies" to the consolidated financial statements in the Annual Report on Form 10-K for the year ended December 31, 2017, for additional information.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2018
Revenue Recognition [Abstract]
Revenue Recognition	REVENUE RECOGNITION The Company records revenue when control of the promised products or services is transferred to the customer, in an amount that reflects the consideration Regions expects to be entitled to in exchange for those products or services. Refer to Note 1 “Summary of Significant Accounting Policies” to the consolidated financial statements to the Annual Report on Form 10-K for the year ended December 31, 2017 , for descriptions of the accounting and reporting policies related to revenue recognition. The following tables present total non-interest income disaggregated by major product category for each reportable segment for the period indicated. Three Months Ended March 31, 2018 Corporate Bank Consumer Bank Wealth Management Other Segment Revenue Other (1) Continuing Operations Discontinued Operations (In millions) Service charges on deposit accounts $ 37 $ 131 $ 1 $ 1 $ 1 $ 171 $ — Card and ATM fees 12 96 — — (4 ) 104 — Investment management and trust fee income — — 58 — — 58 — Capital markets fee income and other 18 — — — 32 50 — Mortgage income — — — — 38 38 — Bank-owned life insurance — — — — 17 17 — Commercial credit fee income — — — — 17 17 — Investment services fee income — — 17 — — 17 — Market value adjustments on employee benefit assets — — — — (1 ) (1 ) — Insurance commissions and fees — — — — — — 34 Other miscellaneous income 5 9 1 — 21 36 — $ 72 $ 236 $ 77 $ 1 $ 121 $ 507 $ 34 Three Months Ended March 31, 2017 (2) Corporate Bank Consumer Bank Wealth Management Other Segment Revenue Other (1) Continuing Operations Discontinued Operations (In millions) Service charges on deposit accounts $ 36 $ 127 $ 1 $ 2 $ 2 $ 168 $ — Card and ATM fees 12 93 — — (1 ) 104 — Investment management and trust fee income — — 56 — — 56 — Capital markets fee income and other 9 — — — 23 32 — Mortgage income — — — — 41 41 — Bank-owned life insurance — — — — 19 19 — Commercial credit fee income — — — — 18 18 — Investment services fee income — — 16 — — 16 — Market value adjustments on employee benefit assets — — — — 5 5 — Insurance commissions and fees — — — — — — 36 Other miscellaneous income 3 11 1 — — 15 — $ 60 $ 231 $ 74 $ 2 $ 107 $ 474 $ 36 ________ (1) This revenue is not impacted by the new accounting guidance and continues to be recognized when earned in accordance with the Company's existing revenue recognition policy. (2) Prior period amounts have not been adjusted under the modified retrospective method. Regions elected the practical expedient related to contract costs and will continue to expense sales commissions and any related contract costs when incurred because the amortization period would have been one year or less. Regions also elected the practical expedient related to remaining performance obligations and therefore did not disclose the value of unsatisfied performance obligations for 1) contracts with an original expected length of one year or less and 2) contracts for which revenue is recognized at the amount to which Regions has the right to invoice for services performed.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Standard Description Required Date of Adoption Effect on Regions' financial statements or other significant matters Standards Adopted (or partially adopted) in 2018 ASU 2014-09, Revenue from Contracts with Customers This ASU supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry topics of the Codification. The core principle of the ASU 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. The ASU may be adopted either retrospectively or on a modified retrospective basis. January 1, 2018 Regions adopted the new revenue recognition standard on January 1, 2018 using the modified retrospective method. The adoption of this guidance did not have a material impact to the financial statements. For the three months ended March 31, 2018, approximately $420 million of non-interest income is within the scope of the new revenue recognition standard and includes service charges on deposit accounts, card and ATM fees, investment management and trust fee income, capital markets fee income, investment services fee income and other components within non-interest income. Income streams that are out of scope of the new standard include interest income, mortgage income, securities gains (losses), bank-owned life insurance and certain other components within non-interest income. Regions also developed additional quantitative and qualitative disclosures required by the new revenue recognition standard. See Note 14. ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities ASU 2018-03, Technical Corrections and Improvements to Financial Instruments ASU 2018-04, Debt Securities and Regulated Operations This ASU amends ASC Topic 825, Financial Instruments-Overall, and addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Among other minor amendments applicable to Regions, the main provisions require investments in equity securities to be measured at fair value with changes in fair value recognized through net income unless they qualify for a practicability exception (excludes investments accounted for under the equity method of accounting or those that result in consolidation of the investee). Except for disclosure requirements that have been adopted prospectively, the ASU must be adopted on a modified retrospective basis. January 1, 2018 The adoption of this guidance resulted in trading account assets and equity securities available for sale being reclassified to other earning assets. The adoption of this guidance did not have a material impact. See Note 3. ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments This ASU amends Topic 230, Statement of Cash Flows, and provides clarification with respect to classification within the statement of cash flows where current guidance is unclear or silent. The ASU must be adopted retrospectively. January 1, 2018 The adoption of this guidance did not have a material impact. ASU 2017-01, Clarifying the Definition of a Business This ASU amends Topic 805, Business Combinations, and provides additional accounting guidance to better determine when a set of assets and activities is a business. The ASU must be adopted prospectively. January 1, 2018 The adoption of this guidance did not have a material impact. ASU 2017-05, Other Income- Gains and Losses from the Derecognition of Nonfinancial Assets This ASU amends Subtopic 610-20, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets, to clarify the scope and to add guidance for partial sales of nonfinancial assets. The new standard adds a definition for in-substance nonfinancial assets and clarifies that nonfinancial assets within a legal entity are within the scope of ASC 606. This ASU may be adopted either retrospectively or on a modified retrospective basis. January 1, 2018 Regions adopted the guidance using the modified retrospective method. The adoption of this guidance did not have a material impact. Standard Description Required Date of Adoption Effect on Regions' financial statements or other significant matters Standards Adopted (or partially adopted) in 2018 (continued) ASU 2017-07, Compensation- Retirement Benefits This ASU amends Topic 715, Retirement Benefits, and provides more prescriptive guidance around the presentation of net periodic pension and postretirement benefit cost in the income statement. The amendment requires that the service cost component be disaggregated from other components of net periodic benefit cost in the income statement. The ASU must be adopted retrospectively. January 1, 2018 For the first quarter of 2018, Regions recorded the service cost component of net periodic pension and postretirement benefit cost in salaries and employee benefits in the income statement. The other components of net periodic pension and postretirement benefit cost were recorded in other non-interest expense. The first quarter of 2017 has been revised to conform to this presentation. The adoption of this guidance did not have a material impact. See Note 9. ASU 2017-09, Stock Compensation: Scope of Modification Accounting This ASU amends Topic 718, Compensation- Stock Compensation, and clarifies when modification accounting should be applied to changes in terms or conditions of share-based payment awards. The amendments narrow the scope of modification accounting by clarifying that modification accounting should be applied to awards if the change affects the fair value, vesting conditions, or classification of the award. The amendments do not impact current disclosure requirements for modifications, regardless of whether modification accounting is required under the new guidance. The ASU must be adopted prospectively to modifications that occur on or after the adoption date. January 1, 2018 The adoption of this guidance did not have a material impact. ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities This ASU amends ASC 815, Derivatives and Hedging to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. Except for disclosure requirements that have been adopted prospectively, the ASU must be adopted on a modified retrospective basis. January 1, 2019. Early adoption is permitted. Regions elected to adopt this ASU for financial reporting as of January 1, 2018. The adoption of this guidance did not have a material impact. See Note 10. ASU 2018-05, Income Taxes This ASU amends SEC guidance in the Codification related to income taxes to reflect the guidance in SEC Staff Accounting Bulletin 118, which provides guidance for companies that are not able to complete their accounting for the income tax effects of the Tax Cuts and Jobs Act in the period of enactment. The staff believes that to the extent a company can reasonably estimate the impact of the Tax Cuts and Job Act, such items should be reported in the first reporting period in which the Company is able to determine the reasonable estimate. Adopted upon issuance. Regions does not expect this guidance to have a material impact. Standard Description Required Date of Adoption Effect on Regions' financial statements or other significant matters Standards Not Yet Adopted ASU 2016-02, Leases ASU 2018-01, Land Easement Practical Expedient for Transition to Topic 842 This ASU creates ASC Topic 842, Leases, and supersedes Topic 840, Leases. The new guidance requires lessees to record a right-of-use asset and a corresponding liability equal to the present value of future rental payments on their balance sheets for all leases with a term greater than one year. There are not significant changes to lessor accounting; however, there were certain improvements made to align lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. This guidance expands both quantitative and qualitative required disclosures. This ASU should be adopted on a modified retrospective basis. January 1, 2019 Early adoption is permitted. This ASU supersedes the lease accounting requirements in ASC Topic 840, Leases. Regions has established a leasing standard implementation team comprised of the Corporate Controller’s group, Corporate Real Estate and other business and finance management to plan and execute the adoption of the new leasing standard. The implementation team has substantially completed the identification of Regions’ leases that will need to be measured and reported as a right-of-use asset and corresponding liability for future rental payments. The implementation team is currently working with a lease administration vendor to set up and test the accounting for the lease contracts on the lease administration system. Based on preliminary estimates that are subject to change, Regions has a range of approximately $400-$600 million of future lease obligations that would be measured and recognized when the new guidance is adopted (refer to Note 24 to consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2017). While this amount represents a large majority of the leases that are within the scope of the new leasing standard, the implementation team will continue reviewing service contracts up through the effective date and may identify additional leases embedded in those arrangements that will be within the scope of the new standard. Between now and January 1, 2019, Regions will likely have changes to the lease portfolio as the Company continues to evaluate and execute branch and occupancy optimization initiatives. In addition to final determination of the lease portfolio at the effective date, the initial measurement of the right-of-use asset and the corresponding liability will be affected by certain key assumptions such as expectations of renewals or extensions and the interest rate to be used to discount the future lease obligations. Up through the date of adoption, the evaluation of the impact of the standard will be adjusted based on new leases that are executed, leases that are terminated prior to the effective date, and any leases with changes to key assumptions or expectations such as renewals and extensions, and discount rates. While there will be some changes to income statement classification, the implementation team does not expect the adoption of the standard to have a material impact to pre-tax income. Regions does not anticipate early adoption of the new standard. ASU 2016-13, Measurement of Credit Losses on Financial Instruments This ASU amends Topic 326, Financial Instruments- Credit Losses to replace the current incurred loss accounting model with a current expected credit loss approach (CECL) for financial instruments measured at amortized cost and other commitments to extend credit. The amendments require entities to consider all available relevant information when estimating current expected credit losses, including details about past events, current conditions, and reasonable and supportable forecasts. The resulting allowance for credit losses is to reflect the portion of the amortized cost basis that the entity does not expect to collect. The amendments also eliminate the current accounting model for purchased credit impaired loans and debt securities. Additional quantitative and qualitative disclosures are required upon adoption. January 1, 2020 Early adoption permitted beginning January 1, 2019. Regions’ cross-functional implementation team, which is co-led by Finance and Risk Management, has developed a project plan that results in the adoption of the standard in the first quarter of 2020. Key project implementation activities for 2018 will focus on model enhancements, execution and implementation, continued challenge of model outputs, processes and controls, policies, disclosures, and data resolution. Regions expects adoption of the standard will result in an overall increase in the allowance for credit losses given the change from accounting for losses inherent in the loan portfolio to accounting for losses over the remaining contractual life of the portfolio. Based on initial modeling, loan portfolios expected to generate the majority of the increase include longer-dated loans such as residential first mortgages and home equity lending products. Additionally, there could be decreases in the allowance in certain of our loan portfolios at adoption. Regions expects no material allowance on held to maturity securities since the majority of this portfolio consists of agency-backed securities that inherently have an immaterial risk of loss. Additionally, Regions expects no material allowance impact to available for sale securities. The amount of the change in these allowances will be impacted by the portfolios’ composition and quality at the adoption date as well as economic conditions and forecasts at that time. Regions does not anticipate early adoption of the new standard. Standard Description Required Date of Adoption Effect on Regions' financial statements or other significant matters Standards Not Yet Adopted ASU 2017-04, Simplifying the Test for Goodwill Impairment This ASU amends Topic 350, Intangibles-Goodwill and Other, and eliminates Step 2 from the goodwill impairment test. January 1, 2020 Regions believes the adoption of this guidance will not have a material impact. Regions does not plan to early adopt. ASU 2017-08, Receivables- Nonrefundable Fees and Other Costs This ASU amends Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs, to shorten the amortization period for certain purchased callable debt securities held at a premium to the earliest call date. Current guidance generally requires entities to amortize a premium as a yield adjustment over the contractual life of the instrument. Shortening the amortization period is generally expected to more closely align the recognition of interest income with expectations incorporated into the pricing of the underlying securities. The amendments do not affect the accounting treatment of discounts. This ASU should be adopted on a modified retrospective basis. January 1, 2019 Regions is evaluating the impact upon adoption; however, the impact is not expected to be material.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	SUBSEQUENT EVENT On April 4, 2018, Regions entered into a stock purchase agreement to sell Regions Insurance Group, Inc. and related affiliates to BB&T Insurance Holdings, Inc. The transaction is expected to generate an after-tax gain of approximately $200 million a nd Common Equity Tier 1 capital of approximately $300 million at closing. The transaction has been authorized by the Board of Directors of the Company and the Board of Directors of BB&T Insurance Holdings, Inc., and is anticipated to close in the third quarter of 2018, subject to regulatory approval and customary closing conditions. The transaction purchase price is not subject to any adjustment that would have a material impact to the consolidated financial statements.

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Condensed Results of Operations for Discontinued Operations	The following table represents the condensed results of operations for the Regions Insurance Group, Inc. entities being sold as discontinued operations: Three Months Ended 2018 2017 (In millions) Non-interest income: Insurance commissions and fees $ 34 $ 36 Total non-interest income 34 36 Non-interest expense: Salaries and employee benefits 24 24 Net occupancy expense 1 2 Furniture and equipment expense 1 1 Other 7 7 Total non-interest expense 33 34 Income (loss) from discontinued operations before income taxes 1 2 Income tax expense (benefit) — 1 Income (loss) from discontinued operations, net of tax $ 1 $ 1 The following table represents the condensed results of operations for both the Regions Insurance Group, Inc. entities being sold and Morgan Keegan and Company, Inc. and related affiliates as discontinued operations: Three Months Ended 2018 2017 (In millions, except per share data) Income (loss) from discontinued operations before income taxes $ — $ 13 Income tax expense (benefit) — 5 Income (loss) from discontinued operations, net of tax $ — $ 8 Earnings (loss) per common share from discontinued operations: Basic $ 0.00 $ 0.01 Diluted $ 0.00 $ 0.01

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost, Gross Unrealized Gains and Losses, And Estimated Fair Value Of Debt Securities Available For Sale And Debt Securities Held To Maturity [Table Text Block]	The amortized cost, gross unrealized gains and losses, and estimated fair value of debt securities held to maturity and debt securities available for sale are as follows: March 31, 2018 Recognized in OCI (1) Not Recognized in OCI Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Carrying Value Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,010 $ — $ (38 ) $ 972 $ 1 $ (13 ) $ 960 Commercial agency 642 — (3 ) 639 — (14 ) 625 $ 1,652 $ — $ (41 ) $ 1,611 $ 1 $ (27 ) $ 1,585 Debt securities available for sale: U.S. Treasury securities $ 333 $ — $ (6 ) $ 327 $ 327 Federal agency securities 42 — — 42 42 Mortgage-backed securities: Residential agency 17,663 23 (534 ) 17,152 17,152 Residential non-agency 2 — — 2 2 Commercial agency 3,742 1 (82 ) 3,661 3,661 Commercial non-agency 774 3 (11 ) 766 766 Corporate and other debt securities 1,145 8 (18 ) 1,135 1,135 $ 23,701 $ 35 $ (651 ) $ 23,085 $ 23,085 December 31, 2017 Recognized in OCI (1) Not Recognized in OCI Amortized Gross Unrealized Gains Gross Unrealized Losses Carrying Value Gross Gross Estimated (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,051 $ — $ (40 ) $ 1,011 $ 12 $ (4 ) $ 1,019 Commercial agency 651 — (4 ) 647 5 (4 ) 648 $ 1,702 $ — $ (44 ) $ 1,658 $ 17 $ (8 ) $ 1,667 Debt securities available for sale: U.S. Treasury securities $ 333 $ — $ (2 ) $ 331 $ 331 Federal agency securities 28 — — 28 28 Mortgage-backed securities: Residential agency 17,622 53 (244 ) 17,431 17,431 Residential non-agency 3 — — 3 3 Commercial agency 3,739 5 (30 ) 3,714 3,714 Commercial non-agency 787 4 (3 ) 788 788 Corporate and other debt securities 1,093 20 (5 ) 1,108 1,108 $ 23,605 $ 82 $ (284 ) $ 23,403 $ 23,403 _________ (1) The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013.
Schedule Of Cost And Estimated Fair Value Of Debt Securities Available For Sale And Debt Securities Held To Maturity By Contractual Maturity	The amortized cost and estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2018 , by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Cost Estimated Fair Value (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ 1,010 $ 960 Commercial agency 642 625 $ 1,652 $ 1,585 Debt securities available for sale: Due in one year or less $ 48 $ 48 Due after one year through five years 964 952 Due after five years through ten years 418 414 Due after ten years 90 90 Mortgage-backed securities: Residential agency 17,663 17,152 Residential non-agency 2 2 Commercial agency 3,742 3,661 Commercial non-agency 774 766 $ 23,701 $ 23,085
Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Debt Securities Available For Sale and Held to Maturity	The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2018 and December 31, 2017 . For debt securities transferred to held to maturity from available for sale, the analysis in the tables below is comparing the securities' original amortized cost to its current estimated fair value. These securities are segregated between investments that have been in a continuous unrealized loss position for less than twelve months and for twelve months or more. March 31, 2018 Less Than Twelve Months Twelve Months or More Total Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ — $ — $ 960 $ (51 ) $ 960 $ (51 ) Commercial agency 485 (8 ) 140 (9 ) 625 (17 ) $ 485 $ (8 ) $ 1,100 $ (60 ) $ 1,585 $ (68 ) Debt securities available for sale: U.S. Treasury securities $ 223 $ (3 ) $ 87 $ (3 ) $ 310 $ (6 ) Mortgage-backed securities: Residential agency 7,524 (169 ) 7,739 (365 ) 15,263 (534 ) Commercial agency 2,600 (50 ) 856 (32 ) 3,456 (82 ) Commercial non-agency 536 (9 ) 59 (2 ) 595 (11 ) Corporate and other debt securities 643 (14 ) 84 (4 ) 727 (18 ) $ 11,526 $ (245 ) $ 8,825 $ (406 ) $ 20,351 $ (651 ) December 31, 2017 Less Than Twelve Months Twelve Months or More Total Estimated Gross Estimated Gross Estimated Gross (In millions) Debt securities held to maturity: Mortgage-backed securities: Residential agency $ — $ — $ 1,019 $ (32 ) $ 1,019 $ (32 ) Commercial agency — — 150 (7 ) 150 (7 ) $ — $ — $ 1,169 $ (39 ) $ 1,169 $ (39 ) Debt securities available for sale: U.S. Treasury securities $ 221 $ (1 ) $ 84 $ (1 ) $ 305 $ (2 ) Mortgage-backed securities: Residential agency 5,157 (40 ) 8,195 (204 ) 13,352 (244 ) Commercial agency 1,666 (10 ) 904 (20 ) 2,570 (30 ) Commercial non-agency 393 (2 ) 61 (1 ) 454 (3 ) Corporate and other debt securities 306 (2 ) 105 (3 ) 411 (5 ) $ 7,743 $ (55 ) $ 9,349 $ (229 ) $ 17,092 $ (284 )
Schedule of Gross Realized Gains And Gross Realized Losses On Available For Sale Debt Securities [Table Text Block]	Gross realized gains and gross realized losses on sales of debt securities available for sale are shown in the table below. The cost of securities sold is based on the specific identification method. Three Months Ended March 31 2018 2017 (In millions) Gross realized gains $ — $ 1 Gross realized losses — (1 ) Debt securities available for sale gains (losses), net $ — $ —
Equity Investments Measured Under Measurement Alternative[Table Text Block]	Equity investments without a readily determinable fair value primarily consist of investments in strategic partners and certain CRA projects. The carrying amount of equity investments measured under the measurement alternative, downward and upward adjustments for impairments and price changes from observable transactions are as follows: Three Months Ended March 31, 2018 (In millions) Carrying value, December 31, 2017 $ 31 Net additions — Downward adjustments for price changes and impairment — Upward adjustments for price changes (1) 7 Carrying value, March 31, 2018 $ 38 _________ (1) Upward adjustments for the three months ended March 31, 2018 related to an observable transaction by the same issuer in an arm's length transaction for a similar ownership interest.

Loans and the Allowance for C28

Loans and the Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table presents the distribution of Regions' loan portfolio by segment and class, net of unearned income: March 31, 2018 December 31, 2017 (In millions, net of unearned income) Commercial and industrial $ 36,787 $ 36,115 Commercial real estate mortgage—owner-occupied 6,044 6,193 Commercial real estate construction—owner-occupied 306 332 Total commercial 43,137 42,640 Commercial investor real estate mortgage 3,742 4,062 Commercial investor real estate construction 1,845 1,772 Total investor real estate 5,587 5,834 Residential first mortgage 13,892 14,061 Home equity 9,916 10,164 Indirect—vehicles 3,310 3,326 Indirect—other consumer 1,611 1,467 Consumer credit card 1,237 1,290 Other consumer 1,132 1,165 Total consumer 31,098 31,473 $ 79,822 $ 79,947
Analysis of the Allowance for Credit Losses by Portfolio Segment	The following tables present analyses of the allowance for credit losses by portfolio segment for the three months ended March 31, 2018 and 2017. The total allowance for loan losses and the related loan portfolio ending balances are disaggregated to detail the amounts derived through individual evaluation and collective evaluation for impairment. The allowance for loan losses related to individually evaluated loans is attributable to reserves for non-accrual commercial and investor real estate loans and all TDRs. The allowance for loan losses and the loan portfolio ending balances related to collectively evaluated loans is attributable to the remainder of the portfolio. Three Months Ended March 31, 2018 Commercial Investor Real Estate Consumer Total (In millions) Allowance for loan losses, January 1, 2018 $ 591 $ 64 $ 279 $ 934 Provision (credit) for loan losses (24 ) (4 ) 18 (10 ) Loan losses: Charge-offs (30 ) (8 ) (74 ) (112 ) Recoveries 10 2 16 28 Net loan losses (20 ) (6 ) (58 ) (84 ) Allowance for loan losses, March 31, 2018 547 54 239 840 Reserve for unfunded credit commitments, January 1, 2018 49 4 — 53 Provision (credit) for unfunded credit losses (4 ) — — (4 ) Reserve for unfunded credit commitments, March 31, 2018 45 4 — 49 Allowance for credit losses, March 31, 2018 $ 592 $ 58 $ 239 $ 889 Portion of ending allowance for loan losses: Individually evaluated for impairment $ 150 $ 10 $ 29 $ 189 Collectively evaluated for impairment 397 44 210 651 Total allowance for loan losses $ 547 $ 54 $ 239 $ 840 Portion of loan portfolio ending balance: Individually evaluated for impairment $ 700 $ 96 $ 476 $ 1,272 Collectively evaluated for impairment 42,437 5,491 30,622 78,550 Total loans evaluated for impairment $ 43,137 $ 5,587 $ 31,098 $ 79,822 Three Months Ended March 31, 2017 Commercial Investor Real Estate Consumer Total (In millions) Allowance for loan losses, January 1, 2017 $ 753 $ 85 $ 253 $ 1,091 Provision (credit) for loan losses 26 1 43 70 Loan losses: Charge-offs (58 ) (1 ) (65 ) (124 ) Recoveries 6 2 16 24 Net loan losses (52 ) 1 (49 ) (100 ) Allowance for loan losses, March 31, 2017 727 87 247 1,061 Reserve for unfunded credit commitments, January 1, 2017 64 5 — 69 Provision (credit) for unfunded credit losses 2 (1 ) — 1 Reserve for unfunded credit commitments, March 31, 2017 66 4 — 70 Allowance for credit losses, March 31, 2017 $ 793 $ 91 $ 247 $ 1,131 Portion of ending allowance for loan losses: Individually evaluated for impairment $ 228 $ 17 $ 56 $ 301 Collectively evaluated for impairment 499 70 191 760 Total allowance for loan losses $ 727 $ 87 $ 247 $ 1,061 Portion of loan portfolio ending balance: Individually evaluated for impairment $ 1,103 $ 126 $ 760 $ 1,989 Collectively evaluated for impairment 41,139 6,356 30,385 77,880 Total loans evaluated for impairment $ 42,242 $ 6,482 $ 31,145 $ 79,869
Financing Receivable Credit Quality Indicators	March 31, 2018 Pass Special Mention Substandard Accrual Non-accrual Total (In millions) Commercial and industrial $ 35,216 $ 609 $ 598 $ 364 $ 36,787 Commercial real estate mortgage—owner-occupied 5,558 250 134 102 6,044 Commercial real estate construction—owner-occupied 288 3 10 5 306 Total commercial $ 41,062 $ 862 $ 742 $ 471 $ 43,137 Commercial investor real estate mortgage $ 3,646 $ 48 $ 34 $ 14 $ 3,742 Commercial investor real estate construction 1,793 15 37 — 1,845 Total investor real estate $ 5,439 $ 63 $ 71 $ 14 $ 5,587 Accrual Non-accrual Total (In millions) Residential first mortgage $ 13,845 $ 47 $ 13,892 Home equity 9,847 69 9,916 Indirect—vehicles 3,310 — 3,310 Indirect—other consumer 1,611 — 1,611 Consumer credit card 1,237 — 1,237 Other consumer 1,132 — 1,132 Total consumer $ 30,982 $ 116 $ 31,098 $ 79,822 December 31, 2017 Pass Special Mention Substandard Accrual Non-accrual Total (In millions) Commercial and industrial $ 34,420 $ 686 $ 605 $ 404 $ 36,115 Commercial real estate mortgage—owner-occupied 5,674 236 165 118 6,193 Commercial real estate construction—owner-occupied 313 3 10 6 332 Total commercial $ 40,407 $ 925 $ 780 $ 528 $ 42,640 Commercial investor real estate mortgage $ 3,905 $ 63 $ 89 $ 5 $ 4,062 Commercial investor real estate construction 1,706 19 46 1 1,772 Total investor real estate $ 5,611 $ 82 $ 135 $ 6 $ 5,834 Accrual Non-accrual Total (In millions) Residential first mortgage $ 14,014 $ 47 $ 14,061 Home equity 10,095 69 10,164 Indirect—vehicles 3,326 — 3,326 Indirect—other consumer 1,467 — 1,467 Consumer credit card 1,290 — 1,290 Other consumer 1,165 — 1,165 Total consumer $ 31,357 $ 116 $ 31,473 $ 79,947
Past Due Financing Receivables	The following tables include an aging analysis of DPD for each portfolio segment and class as of March 31, 2018 and December 31, 2017 : March 31, 2018 Accrual Loans 30-59 DPD 60-89 DPD 90+ DPD Total 30+ DPD Total Accrual Non-accrual Total (In millions) Commercial and industrial $ 42 $ 28 $ 5 $ 75 $ 36,423 $ 364 $ 36,787 Commercial real estate mortgage—owner-occupied 25 3 1 29 5,942 102 6,044 Commercial real estate construction—owner-occupied — — — — 301 5 306 Total commercial 67 31 6 104 42,666 471 43,137 Commercial investor real estate mortgage 1 — — 1 3,728 14 3,742 Commercial investor real estate construction — 29 — 29 1,845 — 1,845 Total investor real estate 1 29 — 30 5,573 14 5,587 Residential first mortgage 78 42 196 316 13,845 47 13,892 Home equity 62 22 33 117 9,847 69 9,916 Indirect—vehicles 39 10 8 57 3,310 — 3,310 Indirect—other consumer 8 5 — 13 1,611 — 1,611 Consumer credit card 10 7 17 34 1,237 — 1,237 Other consumer 11 4 5 20 1,132 — 1,132 Total consumer 208 90 259 557 30,982 116 31,098 $ 276 $ 150 $ 265 $ 691 $ 79,221 $ 601 $ 79,822 December 31, 2017 Accrual Loans 30-59 DPD 60-89 DPD 90+ DPD Total 30+ DPD Total Accrual Non-accrual Total (In millions) Commercial and industrial $ 28 $ 7 $ 4 $ 39 $ 35,711 $ 404 $ 36,115 Commercial real estate mortgage—owner-occupied 18 8 1 27 6,075 118 6,193 Commercial real estate construction—owner-occupied — — — — 326 6 332 Total commercial 46 15 5 66 42,112 528 42,640 Commercial investor real estate mortgage 1 1 1 3 4,057 5 4,062 Commercial investor real estate construction — — — — 1,771 1 1,772 Total investor real estate 1 1 1 3 5,828 6 5,834 Residential first mortgage 95 85 216 396 14,014 47 14,061 Home equity 53 27 37 117 10,095 69 10,164 Indirect—vehicles 48 13 9 70 3,326 — 3,326 Indirect—other consumer 9 5 — 14 1,467 — 1,467 Consumer credit card 11 7 19 37 1,290 — 1,290 Other consumer 13 4 4 21 1,165 — 1,165 Total consumer 229 141 285 655 31,357 116 31,473 $ 276 $ 157 $ 291 $ 724 $ 79,297 $ 650 $ 79,947
Impaired Financing Receivables	The following tables present details related to the Company’s impaired loans as of March 31, 2018 and December 31, 2017 . Loans deemed to be impaired include all TDRs and all non-accrual commercial and investor real estate loans, excluding leases. Loans that have been fully charged-off do not appear in the tables below. Non-accrual Impaired Loans As of March 31, 3018 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Non-accrual Status Impaired Loans on Non-accrual Status with No Related Allowance Impaired Loans on Non-accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 441 $ 81 $ 360 $ 31 $ 329 $ 89 38.5 % Commercial real estate mortgage—owner-occupied 113 11 102 18 84 33 38.9 Commercial real estate construction—owner-occupied 5 — 5 — 5 2 40.0 Total commercial 559 92 467 49 418 124 38.6 Commercial investor real estate mortgage 22 8 14 1 13 5 59.1 Commercial investor real estate construction 1 1 — — — — 100.0 Total investor real estate 23 9 14 1 13 5 60.9 Residential first mortgage 41 10 31 — 31 3 31.7 Home equity 10 1 9 — 9 — 10.0 Total consumer 51 11 40 — 40 3 27.5 $ 633 $ 112 $ 521 $ 50 $ 471 $ 132 38.5 % Accruing Impaired Loans As of March 31, 2018 Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Book Value (3) Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 181 $ 7 $ 174 $ 22 16.0 % Commercial real estate mortgage—owner-occupied 63 5 58 4 14.3 Commercial real estate construction—owner-occupied 1 — 1 — — Total commercial 245 12 233 26 15.5 Commercial investor real estate mortgage 55 2 53 2 7.3 Commercial investor real estate construction 29 — 29 3 10.3 Total investor real estate 84 2 82 5 8.3 Residential first mortgage 194 6 188 18 12.4 Home equity 240 1 239 8 3.8 Consumer credit card 1 — 1 — — Other consumer 8 — 8 — — Total consumer 443 7 436 26 7.4 $ 772 $ 21 $ 751 $ 57 10.1 % Total Impaired Loans As of March 31, 2018 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans Impaired Loans with No Related Allowance Impaired Loans with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 622 $ 88 $ 534 $ 31 $ 503 $ 111 32.0 % Commercial real estate mortgage—owner-occupied 176 16 160 18 142 37 30.1 Commercial real estate construction—owner-occupied 6 — 6 — 6 2 33.3 Total commercial 804 104 700 49 651 150 31.6 Commercial investor real estate mortgage 77 10 67 1 66 7 22.1 Commercial investor real estate construction 30 1 29 — 29 3 13.3 Total investor real estate 107 11 96 1 95 10 19.6 Residential first mortgage 235 16 219 — 219 21 15.7 Home equity 250 2 248 — 248 8 4.0 Consumer credit card 1 — 1 — 1 — — Other consumer 8 — 8 — 8 — — Total consumer 494 18 476 — 476 29 9.5 $ 1,405 $ 133 $ 1,272 $ 50 $ 1,222 $ 189 22.9 % Non-accrual Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Non-accrual Status Impaired Loans on Non-accrual Status with No Related Allowance Impaired Loans on Non-accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 480 $ 80 $ 400 $ 29 $ 371 $ 103 38.1 % Commercial real estate mortgage—owner-occupied 133 15 118 20 98 38 39.8 Commercial real estate construction—owner-occupied 7 1 6 — 6 3 57.1 Total commercial 620 96 524 49 475 144 38.7 Commercial investor real estate mortgage 6 1 5 — 5 2 50.0 Commercial investor real estate construction 1 — 1 — 1 — — Total investor real estate 7 1 6 — 6 2 42.9 Residential first mortgage 42 11 31 — 31 3 33.3 Home equity 10 1 9 — 9 — 10.0 Total consumer 52 12 40 — 40 3 28.8 $ 679 $ 109 $ 570 $ 49 $ 521 $ 149 38.0 % Accruing Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans on Accrual Status Impaired Loans on Accrual Status with No Related Allowance Impaired Loans on Accrual Status with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 154 $ 8 $ 146 $ 1 $ 145 $ 19 17.5 % Commercial real estate mortgage—owner-occupied 90 5 85 — 85 8 14.4 Commercial real estate construction—owner-occupied 1 — 1 — 1 — — Total commercial 245 13 232 1 231 27 16.3 Commercial investor real estate mortgage 63 2 61 — 61 3 7.9 Commercial investor real estate construction 29 — 29 — 29 3 10.3 Total investor real estate 92 2 90 — 90 6 8.7 Residential first mortgage 419 13 406 — 406 39 12.4 Home equity 251 1 250 — 250 5 2.4 Consumer credit card 1 — 1 — 1 — — Other consumer 9 — 9 — 9 — — Total consumer 680 14 666 — 666 44 8.5 $ 1,017 $ 29 $ 988 $ 1 $ 987 $ 77 10.4 % Total Impaired Loans As of December 31, 2017 Book Value (3) Unpaid Principal Balance (1) Charge-offs and Payments Applied (2) Total Impaired Loans Impaired Loans with No Related Allowance Impaired Loans with Related Allowance Related Allowance for Loan Losses Coverage % (4) (Dollars in millions) Commercial and industrial $ 634 $ 88 $ 546 $ 30 $ 516 $ 122 33.1 % Commercial real estate mortgage—owner-occupied 223 20 203 20 183 46 29.6 Commercial real estate construction—owner-occupied 8 1 7 — 7 3 50.0 Total commercial 865 109 756 50 706 171 32.4 Commercial investor real estate mortgage 69 3 66 — 66 5 11.6 Commercial investor real estate construction 30 — 30 — 30 3 10.0 Total investor real estate 99 3 96 — 96 8 11.1 Residential first mortgage 461 24 437 — 437 42 14.3 Home equity 261 2 259 — 259 5 2.7 Consumer credit card 1 — 1 — 1 — — Other consumer 9 — 9 — 9 — — Total consumer 732 26 706 — 706 47 10.0 $ 1,696 $ 138 $ 1,558 $ 50 $ 1,508 $ 226 21.5 % ________ (1) Unpaid principal balance represents the contractual obligation due from the customer and includes the net book value plus charge-offs and payments applied. (2) Charge-offs and payments applied represents cumulative partial charge-offs taken, as well as interest payments received that have been applied against the outstanding principal balance. (3) Book value represents the unpaid principal balance less charge-offs and payments applied; it is shown before any allowance for loan losses. (4) Coverage % represents charge-offs and payments applied plus the related allowance as a percent of the unpaid principal balance. The following table presents the average balances of total impaired loans and interest income for the three months ended March 31, 2018 and 2017 . Interest income recognized represents interest on accruing loans modified in a TDR. Three Months Ended March 31 2018 2017 Average Balance Interest Income Recognized Average Balance Interest Income Recognized (In millions) Commercial and industrial $ 533 $ 3 $ 819 $ 2 Commercial real estate mortgage—owner-occupied 166 3 264 1 Commercial real estate construction—owner-occupied 6 — 6 — Total commercial 705 6 1,089 3 Commercial investor real estate mortgage 76 1 91 1 Commercial investor real estate construction 30 — 33 — Total investor real estate 106 1 124 1 Residential first mortgage 288 2 455 4 Home equity 252 3 295 4 Consumer credit card 1 — 2 — Other consumer 8 — 10 — Total consumer 549 5 762 8 Total impaired loans $ 1,360 $ 12 $ 1,975 $ 12
Troubled Debt Restructurings on Financing Receivables	The following tables present the end of period balance for loans modified in a TDR during the periods presented by portfolio segment and class, and the financial impact of those modifications. The tables include modifications made to new TDRs, as well as renewals of existing TDRs. Loans first reported as TDRs during the three months ended March 31, 2018 and 2017 totaled approximately $171 million and $128 million , respectively. Three Months Ended March 31, 2018 Financial Impact Number of Recorded Increase in (Dollars in millions) Commercial and industrial 29 $ 164 $ 2 Commercial real estate mortgage—owner-occupied 18 14 — Total commercial 47 178 2 Commercial investor real estate mortgage 10 19 1 Total investor real estate 10 19 1 Residential first mortgage 53 8 1 Home equity 17 1 — Consumer credit card 14 — — Indirect—vehicles and other consumer 13 — — Total consumer 97 9 1 154 $ 206 $ 4 Three Months Ended March 31, 2017 Financial Impact Number of Recorded Increase in (Dollars in millions) Commercial and industrial 31 $ 99 $ 3 Commercial real estate mortgage—owner-occupied 31 28 1 Commercial real estate construction—owner-occupied 2 1 — Total commercial 64 128 4 Commercial investor real estate mortgage 12 19 — Commercial investor real estate construction 3 26 1 Total investor real estate 15 45 1 Residential first mortgage 49 8 1 Home equity 58 5 — Consumer credit card 19 — — Indirect—vehicles and other consumer 47 1 — Total consumer 173 14 1 252 $ 187 $ 6

Servicing of Financial Assets (

Servicing of Financial Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Schedule of Residential Mortgage Servicing Rights Under The Fair Value Measurement Method	The table below presents an analysis of residential MSRs under the fair value measurement method: Three Months Ended March 31 2018 2017 (In millions) Carrying value, beginning of period $ 336 $ 324 Additions 8 8 Increase (decrease) in fair value: Due to change in valuation inputs or assumptions 22 4 Economic amortization associated with borrower repayments (1) (10 ) (10 ) Carrying value, end of period $ 356 $ 326 ________ (1) "Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns.
Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Residential Mortgage Servicing Rights	Data and assumptions used in the fair value calculation, as well as the valuation’s sensitivity to rate fluctuations, related to residential MSRs (excluding related derivative instruments) are as follows: March 31 2018 2017 (Dollars in millions) Unpaid principal balance $ 31,641 $ 30,960 Weighted-average CPR (%) 9.0 % 7.6 % Estimated impact on fair value of a 10% increase $ (24 ) $ (19 ) Estimated impact on fair value of a 20% increase $ (43 ) $ (34 ) Option-adjusted spread (basis points) 842 1,058 Estimated impact on fair value of a 10% increase $ (12 ) $ (13 ) Estimated impact on fair value of a 20% increase $ (24 ) $ (27 ) Weighted-average coupon interest rate 4.1 % 4.2 % Weighted-average remaining maturity (months) 280 280 Weighted-average servicing fee (basis points) 27.3 27.4
Schedule Of Fees Resulting From The Servicing Of Residential Mortgage Loans	The following table presents servicing related fees, which includes contractually specified servicing fees, late fees and other ancillary income resulting from the servicing of residential mortgage loans: Three Months Ended March 31 2018 2017 (In millions) Servicing related fees and other ancillary income $ 23 $ 23

Goodwill (Tables)

Goodwill (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill allocated to each reportable segment (each a reporting unit) is presented as follows: March 31, 2018 December 31, 2017 (In millions) Corporate Bank $ 2,474 $ 2,474 Consumer Bank 1,978 1,978 Wealth Management 452 452 $ 4,904 $ 4,904

Stockholders' Equity and Accu31

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Summary of the non-cumulative perpetual preferred stock	The following table presents a summary of the non-cumulative perpetual preferred stock: March 31, 2018 December 31, 2017 Issuance Date Earliest Redemption Date Dividend Rate Liquidation Amount Carrying Amount Carrying Amount (Dollars in millions) Series A 11/1/2012 12/15/2017 6.375 % $ 500 $ 387 $ 387 Series B 4/29/2014 9/15/2024 6.375 % (1) 500 433 433 $ 1,000 $ 820 $ 820 _________ (1) Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375% , and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536% .
Schedule of Accumulated Other Comprehensive Income (Loss)	Activity within the balances in accumulated other comprehensive income (loss), net is shown in the following tables: Three Months Ended March 31, 2018 Unrealized losses on securities transferred to held to maturity Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Defined benefit pension plans and other post employment benefits Accumulated other comprehensive (In millions) Beginning of period $ (33 ) $ (153 ) $ (51 ) $ (512 ) $ (749 ) Net change 2 (310 ) (100 ) 6 (402 ) End of period $ (31 ) $ (463 ) $ (151 ) $ (506 ) $ (1,151 ) Three Months Ended March 31, 2017 Unrealized losses on securities transferred to held to maturity Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Defined benefit pension plans and other post employment benefits Accumulated other comprehensive (In millions) Beginning of period $ (33 ) $ (106 ) $ 11 $ (422 ) $ (550 ) Net change 2 1 (23 ) 5 (15 ) End of period $ (31 ) $ (105 ) $ (12 ) $ (417 ) $ (565 )
Reclassification From Accumulated Other Comprehensive Income (Loss)	The following table presents amounts reclassified out of accumulated other comprehensive income (loss) for the three months ended March 31, 2018 and 2017 : Three Months Ended March 31, 2018 Three Months Ended March 31, 2017 Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) (1) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) (1) Affected Line Item in the Consolidated Statements of Income (In millions) Unrealized losses on securities transferred to held to maturity: $ (3 ) $ (3 ) Net interest income and other financing income 1 1 Tax (expense) or benefit $ (2 ) $ (2 ) Net of tax Unrealized gains and (losses) on available for sale securities: $ — $ — Securities gains (losses), net — — Tax (expense) or benefit $ — $ — Net of tax Gains and (losses) on cash flow hedges: Interest rate contracts $ 11 $ 31 Net interest income and other financing income (3 ) (12 ) Tax (expense) or benefit $ 8 $ 19 Net of tax Amortization of defined benefit pension plans and other post employment benefits: Actuarial gains (losses) $ (9 ) $ (9 ) (2) (9 ) (9 ) Total before tax 2 3 Tax (expense) or benefit $ (7 ) $ (6 ) Net of tax Total reclassifications for the period $ (1 ) $ 11 Net of tax ________ (1) Amounts in parentheses indicate reductions to net income. (2) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost and is included in other non-interest expense on the consolidated statements of income (see Note 9 for additional details).

Earnings (Loss) Per Common Sh32

Earnings (Loss) Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic earnings (loss) per common share and diluted earnings (loss) per common share: Three Months Ended March 31 2018 2017 (In millions, except per share amounts) Numerator: Income from continuing operations $ 414 $ 293 Preferred stock dividends (16 ) (16 ) Income from continuing operations available to common shareholders 398 277 Income (loss) from discontinued operations, net of tax — 8 Net income available to common shareholders $ 398 $ 285 Denominator: Weighted-average common shares outstanding—basic 1,127 1,209 Potential common shares 14 15 Weighted-average common shares outstanding—diluted 1,141 1,224 Earnings per common share from continuing operations available to common shareholders (1) : Basic $ 0.35 $ 0.23 Diluted 0.35 0.23 Earnings (loss) per common share from discontinued operations (1) : Basic $ 0.00 $ 0.01 Diluted 0.00 0.01 Earnings per common share (1) : Basic $ 0.35 $ 0.24 Diluted 0.35 0.23 ________ (1) Certain per share amounts may not appear to reconcile due to rounding.

Pension and Other Postretirem33

Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Schedule of Net Periodic Pension Cost	Net periodic pension cost (credit) includes the following components: Qualified Plans Non-qualified Plans Total Three Months Ended March 31 2018 2017 2018 2017 2018 2017 (In millions) Service cost $ 9 $ 8 $ 1 $ 1 $ 10 $ 9 Interest cost 18 18 1 1 19 19 Expected return on plan assets (37 ) (35 ) — — (37 ) (35 ) Amortization of actuarial loss 8 8 1 1 9 9 Net periodic pension cost (credit) $ (2 ) $ (1 ) $ 3 $ 3 $ 1 $ 2

Derivative Financial Instrume34

Derivative Financial Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Instruments Notional And Fair Values	The following tables present the notional amount and estimated fair value of derivative instruments on a gross basis as of March 31, 2018 and December 31, 2017 . Beginning in the first quarter of 2018, variation margin payments made for derivatives cleared through LCH Limited are legally characterized as settlements of the derivatives. Exchange traded derivatives cleared through LCH Limited were not offset prior to January 2018. March 31, 2018 December 31, 2017 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Gain (1) Loss (1) Gain (1) Loss (1) (In millions) Derivatives in fair value hedging relationships: Interest rate swaps $ 3,597 $ 3,060 $ 1 $ 43 Derivatives in cash flow hedging relationships: Interest rate swaps 7,825 6,825 5 188 Total derivatives designated as hedging instruments $ 11,422 $ 9,885 $ 6 $ 231 Derivatives not designated as hedging instruments: Interest rate swaps $ 41,166 $ 140 $ 307 $ 40,841 $ 308 $ 342 Interest rate options 5,063 39 23 4,598 23 15 Interest rate futures and forward commitments 42,341 10 11 20,404 6 5 Other contracts 6,066 59 55 5,721 51 48 Total derivatives not designated as hedging instruments $ 94,636 $ 248 $ 396 $ 71,564 $ 388 $ 410 Total derivatives $ 106,058 $ 248 $ 396 $ 81,449 $ 394 $ 641 Total gross derivative instruments, before netting $ 248 $ 396 $ 394 $ 641 Less: Legally enforceable master netting agreements 112 112 107 107 Less: Cash collateral received/posted 30 113 34 131 Total gross derivative instruments, after netting (2) $ 106 $ 171 $ 253 $ 403 _________ (1) Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities on the consolidated balance sheets. There is no fair value presented for contracts that are characterized as settled daily. (2) As of March 31, 2018, financial instruments posted of $49 million were not offset in the consolidated balance sheets. As of December 31, 2017, cash collateral posted of $257 million and financial instruments posted of $50 million were not offset in the consolidated balance sheets.
Schedule Of Effect Of Hedging Derivative Instruments On Statements Of Operations	The following tables present the effect of hedging derivative instruments on the consolidated statements of income: Three Months Ended March 31, 2018 Interest Income Interest Expense Non-interest expense Debt securities-taxable Loans, including fees Deposits Long-term borrowings Other Total amounts presented in the consolidated statements of income $ 154 $ 851 $ 49 $ 72 $ 225 Gains/(losses) on fair value hedging relationships: Interest rate contracts: Amounts related to interest settlements on derivatives $ — $ — $ — $ (1 ) $ — Recognized on derivatives 3 — — (32 ) — Recognized on hedged items (3 ) — — 32 — Net income (expense) recognized on fair value hedges $ — $ — $ — $ (1 ) $ — Gains/(losses) on cash flow hedging relationships: (1) Interest rate contracts: Realized gains (losses) reclassified from AOCI into net income (2) $ — $ 11 $ — $ — $ — Net income (expense) recognized on cash flow hedges $ — $ 11 $ — $ — $ — Three Months Ended March 31, 2017 Interest Income Interest Expense Non-interest expense Securities-taxable Loans, including fees Deposits Long-term borrowings Other Total amounts presented in the consolidated statements of income $ 147 $ 773 $ 35 $ 50 $ 220 Gains/(losses) on fair value hedging relationships: Interest rate contracts: Amounts related to interest settlements on derivatives $ (1 ) $ — $ — $ 1 $ — Recognized on derivatives — — — — — Recognized on hedged items — — — — — Net income (expense) recognized on fair value hedges $ (1 ) $ — $ — $ 1 $ — Gains/(losses) on cash flow hedging relationships: (1) Interest rate contracts: Realized gains (losses) reclassified from AOCI into net income (2) $ — $ 31 $ — $ — $ — Net income (expense) recognized on cash flow hedges $ — $ 31 $ — $ — $ — _____ (1) See Note 7 for gain or (loss) recognized for cash flow hedges in AOCI. (2) Pre-tax
Schedule of Fair Value Hedging Basis Adjustments [Table Text Block]	The following table presents the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. March 31, 2018 Hedged Items Currently Designated Hedged Items No Longer Designated Carrying Amount of Assets/(Liabilities) Hedge Accounting Basis Adjustment Assets/(Liabilities) Carrying Amount of Assets/(Liabilities) Hedge Accounting Basis Adjustment Assets/(Liabilities) (In millions) Debt securities available for sale $ 210 $ (3 ) $ 577 $ 7 Long-term borrowings (3,321 ) 82 (101 ) —
Schedule of Gains (Losses) Recognized Related to Derivatives Not Designated as Hedging Instruments	The following table presents the location and amount of gain or (loss) recognized in income on derivatives not designated as hedging instruments in the consolidated statements of income for the three months ended March 31, 2017 and 2017 : Three Months Ended March 31 Derivatives Not Designated as Hedging Instruments 2018 2017 (In millions) Capital markets fee income and other (1) : Interest rate swaps $ 7 $ 2 Interest rate options 7 2 Interest rate futures and forward commitments 1 2 Other contracts 2 (8 ) Total capital markets fee income and other 17 (2 ) Mortgage income: Interest rate swaps (18 ) (2 ) Interest rate options 3 2 Interest rate futures and forward commitments (3 ) (8 ) Total mortgage income (18 ) (8 ) $ (1 ) $ (10 ) ______ (1) Capital markets fee income and other is included in Other income on the consolidated statements of income.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis And Non-Recurring Basis	The following table presents assets and liabilities measured at estimated fair value on a recurring basis and non-recurring basis as of March 31, 2018 and December 31, 2017 : March 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 (1) Total Estimated Fair Value Level 1 Level 2 Level 3 (1) Total Estimated Fair Value (In millions) Recurring fair value measurements Debt securities available for sale: U.S. Treasury securities $ 327 $ — $ — $ 327 $ 331 $ — $ — $ 331 Federal agency securities — 42 — 42 — 28 — 28 Mortgage-backed securities (MBS): Residential agency — 17,152 — 17,152 — 17,431 — 17,431 Residential non-agency — — 2 2 — — 3 3 Commercial agency — 3,661 — 3,661 — 3,714 — 3,714 Commercial non-agency — 766 — 766 — 788 — 788 Corporate and other debt securities — 1,132 3 1,135 — 1,105 3 1,108 Total debt securities available for sale $ 327 $ 22,753 $ 5 $ 23,085 $ 331 $ 23,066 $ 6 $ 23,403 Loans held for sale $ — $ 282 $ — $ 282 $ — $ 325 $ — $ 325 Marketable equity securities (2) $ 525 $ — $ — $ 525 $ 414 $ — $ — $ 414 Residential mortgage servicing rights $ — $ — $ 356 $ 356 $ — $ — $ 336 $ 336 Derivative assets: Interest rate swaps $ — $ 140 $ — $ 140 $ — $ 314 $ — $ 314 Interest rate options — 26 13 39 — 18 5 23 Interest rate futures and forward commitments — 10 — 10 — 6 — 6 Other contracts 2 57 — 59 2 49 — 51 Total derivative assets $ 2 $ 233 $ 13 $ 248 $ 2 $ 387 $ 5 $ 394 Derivative liabilities: Interest rate swaps $ — $ 307 $ — $ 307 $ — $ 573 $ — $ 573 Interest rate options — 23 — 23 — 15 — 15 Interest rate futures and forward commitments — 11 — 11 — 5 — 5 Other contracts 2 53 — 55 2 46 — 48 Total derivative liabilities $ 2 $ 394 $ — $ 396 $ 2 $ 639 $ — $ 641 Non-recurring fair value measurements Loans held for sale $ — $ — $ 7 $ 7 $ — $ — $ 20 $ 20 Equity investments without a readily determinable fair value (3) — — 13 13 — — — — Foreclosed property and other real estate — 18 4 22 — 24 9 33 _________ (1) All following disclosures related to Level 3 recurring and non-recurring assets do not include those deemed to be immaterial. (2) Marketable equity securities were reclassified from trading account securities and securities available for sale to other earning assets, beginning in the first quarter of 2018, with the adoption of new accounting guidance. Prior periods have been reclassified to conform to current period presentation. (3) With the adoption of new accounting guidance, effective January 1, 2018, equity investments without a readily determinable fair value are required to be adjusted prospectively to estimated fair value when an observable price transaction for a same or similar investment with the same issuer occurs.
Rollforward For Assets And Liabilities Measured At Fair Value On A Recurring Basis With Level 3 Significant Unobservable Inputs	The following tables illustrate rollforwards for all material assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2018 and 2017 , respectively. The net changes in realized gains (losses) included in earnings related to Level 3 assets and liabilities held at March 31, 2018 and 2017 are not material. Three Months Ended March 31, 2018 Opening Total Realized / Unrealized Gains or Losses Purchases Sales Issuances Settlements Transfers Transfers Closing Included in Earnings Included in Other Compre- hensive Income (Loss) (In millions) Level 3 Instruments Only Residential mortgage servicing rights $ 336 12 (1) — 8 — — — — — $ 356 Three Months Ended March 31, 2017 Opening Total Realized / Unrealized Gains or Losses Purchases Sales Issuances Settlements Transfers into Level 3 Transfers out of Level 3 Closing Included in Earnings Included in Other Compre- hensive Income (Loss) (In millions) Level 3 Instruments Only Residential mortgage servicing rights $ 324 (6 ) (1) — 8 — — — — — $ 326 _________ (1) Included in mortgage income.
Schedule Of Fair Value Adjustments Related To Non-Recurring Fair Value Measurements	The following table presents the fair value adjustments related to non-recurring fair value measurements: Three Months Ended March 31 2018 2017 (In millions) Loans held for sale $ (3 ) $ (4 ) Foreclosed property and other real estate (5 ) (4 ) Equity investments without a readily determinable fair value 7 —
Summary Of Quantitative Information About Level 3 Measurements	The following tables present detailed information regarding material assets and liabilities measured at fair value using significant unobservable inputs (Level 3) as of March 31, 2018 , and December 31, 2017 . The tables include the valuation techniques and the significant unobservable inputs utilized. The range of each significant unobservable input as well as the weighted-average within the range utilized at March 31, 2018 , and December 31, 2017 , are included. Following the tables are descriptions of the valuation techniques and the sensitivity of the techniques to changes in the significant unobservable inputs. March 31, 2018 Level 3 Valuation Technique Unobservable Input(s) Quantitative Range of Unobservable Inputs and (Weighted-Average) (Dollars in millions) Recurring fair value measurements: Residential mortgage servicing rights (1) $356 Discounted cash flow Weighted-average CPR (%) 3.6% - 28.0% (9.0%) OAS (%) 7.8% - 15.0% (8.4%) _________ (1) See Note 5 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights. December 31, 2017 Level 3 Valuation Technique Unobservable Input(s) Quantitative Range of Unobservable Inputs and (Weighted-Average) (Dollars in millions) Recurring fair value measurements: Residential mortgage servicing rights (1) $336 Discounted cash flow Weighted-average CPR (%) 7.9% - 28.1% (9.9%) OAS (%) 8.1% - 15.0% (8.6%) _________ (1) See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2017 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
Fair Value Option, Fair Value and Unpaid Principal Balance	The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value: March 31, 2018 December 31, 2017 Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal (In millions) Mortgage loans held for sale, at fair value $ 282 $ 273 $ 9 $ 325 $ 314 $ 11 Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest income on loans held for sale in the consolidated statements of income. The following table details net gains and losses resulting from changes in fair value of these loans, which were recorded in mortgage income in the consolidated statements of income during the three months ended March 31, 2018 and 2017 . These changes in fair value are mostly offset by economic hedging activities. An immaterial portion of these amounts was attributable to changes in instrument-specific credit risk. Net gains (losses) resulting from changes in fair value Three Months Ended March 31 2018 2017 (In millions) Mortgage loans held for sale, at fair value $ (3 ) $ 4
Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments	The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments as of March 31, 2018 are as follows: March 31, 2018 Carrying Amount Estimated Fair Value (1) Level 1 Level 2 Level 3 (In millions) Financial assets: Cash and cash equivalents $ 3,185 $ 3,185 $ 3,185 $ — $ — Debt securities held to maturity 1,611 1,585 — 1,585 — Debt securities available for sale 23,085 23,085 327 22,753 5 Loans held for sale 452 452 — 439 13 Loans (excluding leases), net of unearned income and allowance for loan losses (2)(3) 77,917 76,683 — — 76,683 Other earning assets (4) 1,190 1,190 525 665 — Derivative assets 248 248 2 233 13 Financial liabilities: Derivative liabilities 396 396 2 394 — Deposits 96,990 97,015 — 97,015 — Long-term borrowings 7,949 8,239 — 7,814 425 Loan commitments and letters of credit 77 413 — — 413 _________ (1) Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred. (2) The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at March 31, 2018 was $1.2 billion or 1.6 percent. (3) Excluded from this table is the capital lease carrying amount of $1.1 billion at March 31, 2018 . (4) Excluded from this table is the operating lease carrying amount of $ 450 million at March 31, 2018 . The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company's financial instruments as of December 31, 2017 are as follows: December 31, 2017 Carrying Amount Estimated Fair Value (1) Level 1 Level 2 Level 3 (In millions) Financial assets: Cash and cash equivalents $ 3,981 $ 3,981 $ 3,981 $ — $ — Debt securities held to maturity 1,658 1,667 — 1,667 — Debt securities available for sale 23,403 23,403 331 23,066 6 Loans held for sale 348 348 — 328 20 Loans (excluding leases), net of unearned income and allowance for loan losses (2)(3) 77,942 76,871 — — 76,871 Other earning assets (4) 1,402 1,402 414 988 — Derivative assets 394 394 2 387 5 Financial liabilities: Derivative liabilities 641 641 2 639 — Deposits 96,889 96,927 — 96,927 — Long-term borrowings 8,132 8,517 — 7,757 760 Loan commitments and letters of credit 79 540 — — 540 _________ (1) Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred. (2) The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at December 31, 2017 was $1.1 billion or 1.4 percent. (3) Excluded from this table is the capital lease carrying amount of $1.1 billion at December 31, 2017 . (4) Excluded from this table is the operating lease carrying amount of $489 million at December 31, 2017 .

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule Of Financial Information By Reportable Segment	The following tables present financial information for each reportable segment for the period indicated. Three Months Ended March 31, 2018 Corporate Bank Consumer Bank Wealth Management Other Continuing Operations Discontinued Operations Consolidated (In millions) Net interest income and other financing income (loss) $ 340 $ 542 $ 49 $ (22 ) $ 909 $ — $ 909 Provision (credit) for loan losses 55 76 4 (145 ) (10 ) — (10 ) Non-interest income 144 276 77 10 507 34 541 Non-interest expense 233 523 91 37 884 34 918 Income (loss) before income taxes 196 219 31 96 542 — 542 Income tax expense (benefit) 49 55 8 16 128 — 128 Net income (loss) $ 147 $ 164 $ 23 $ 80 $ 414 $ — $ 414 Average assets $ 51,037 $ 35,011 $ 2,359 $ 34,917 $ 123,324 $ 170 $ 123,494 Three Months Ended March 31, 2017 Corporate Bank Consumer Bank Wealth Management Other Continuing Operations Discontinued Operations Consolidated (In millions) Net interest income and other financing income (loss) $ 341 $ 518 $ 46 $ (46 ) $ 859 $ — $ 859 Provision (credit) for loan losses 67 74 5 (76 ) 70 — 70 Non-interest income 123 275 74 2 474 36 510 Non-interest expense 214 513 84 32 843 23 866 Income (loss) before income taxes 183 206 31 — 420 13 433 Income tax expense (benefit) 69 78 12 (32 ) 127 5 132 Net income (loss) $ 114 $ 128 $ 19 $ 32 $ 293 $ 8 $ 301 Average assets $ 52,340 $ 35,047 $ 2,518 $ 34,747 $ 124,652 $ 158 $ 124,810

Commitments, Contingencies an37

Commitments, Contingencies and Guarantees (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Credit Risk Of Financial Instruments By Contractual Amounts	Credit risk associated with these instruments is represented by the contractual amounts indicated in the following table: March 31, 2018 December 31, 2017 (In millions) Unused commitments to extend credit $ 46,328 $ 45,705 Standby letters of credit 1,436 1,348 Commercial letters of credit 76 76 Liabilities associated with standby letters of credit 28 26 Assets associated with standby letters of credit 29 28 Reserve for unfunded credit commitments 49 53

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue Recognition [Abstract]
Disaggregation of Revenue	The following tables present total non-interest income disaggregated by major product category for each reportable segment for the period indicated. Three Months Ended March 31, 2018 Corporate Bank Consumer Bank Wealth Management Other Segment Revenue Other (1) Continuing Operations Discontinued Operations (In millions) Service charges on deposit accounts $ 37 $ 131 $ 1 $ 1 $ 1 $ 171 $ — Card and ATM fees 12 96 — — (4 ) 104 — Investment management and trust fee income — — 58 — — 58 — Capital markets fee income and other 18 — — — 32 50 — Mortgage income — — — — 38 38 — Bank-owned life insurance — — — — 17 17 — Commercial credit fee income — — — — 17 17 — Investment services fee income — — 17 — — 17 — Market value adjustments on employee benefit assets — — — — (1 ) (1 ) — Insurance commissions and fees — — — — — — 34 Other miscellaneous income 5 9 1 — 21 36 — $ 72 $ 236 $ 77 $ 1 $ 121 $ 507 $ 34 Three Months Ended March 31, 2017 (2) Corporate Bank Consumer Bank Wealth Management Other Segment Revenue Other (1) Continuing Operations Discontinued Operations (In millions) Service charges on deposit accounts $ 36 $ 127 $ 1 $ 2 $ 2 $ 168 $ — Card and ATM fees 12 93 — — (1 ) 104 — Investment management and trust fee income — — 56 — — 56 — Capital markets fee income and other 9 — — — 23 32 — Mortgage income — — — — 41 41 — Bank-owned life insurance — — — — 19 19 — Commercial credit fee income — — — — 18 18 — Investment services fee income — — 16 — — 16 — Market value adjustments on employee benefit assets — — — — 5 5 — Insurance commissions and fees — — — — — — 36 Other miscellaneous income 3 11 1 — — 15 — $ 60 $ 231 $ 74 $ 2 $ 107 $ 474 $ 36 ________ (1) This revenue is not impacted by the new accounting guidance and continues to be recognized when earned in accordance with the Company's existing revenue recognition policy. (2) Prior period amounts have not been adjusted under the modified retrospective method.

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Basis of Presentation [Abstract]
Cumulative Effect on Retained Earnings, Net of Tax	$ 2

Discontinued Operations (Schedu

Discontinued Operations (Schedule of Discontinued Operations Income Statement) (Details) - USD ($) $ / shares in Units, $ in Millions		Apr. 04, 2018	Mar. 31, 2018	Mar. 31, 2017
Non-interest income:
Total non-interest income			$ 507	$ 474
Non-interest expense:
Salaries and employee benefits			495	461
Net occupancy expense			83	83
Furniture and equipment expense			81	79
Other			225	220
Total non-interest expense			884	843
Income (loss) from discontinued operations before income taxes			0	13
Income tax expense (benefit)			0	5
Income (loss) from discontinued operations, net of tax			$ 0	$ 8
Earnings (loss) per common share from discontinued operations:
Basic (in dollars per share)	[1]		$ 0	$ 0.01
Diluted (in dollars per share)	[1]		$ 0	$ 0.01
Regions Insurance Group, Inc - Discontinued Operations [Member]
Non-interest income:
Insurance Commissions and Fees			$ 34	$ 36
Total non-interest income			34	36
Non-interest expense:
Salaries and employee benefits			24	24
Net occupancy expense			1	2
Furniture and equipment expense			1	1
Other			7	7
Total non-interest expense			33	34
Income (loss) from discontinued operations before income taxes			1	2
Income tax expense (benefit)			0	1
Income (loss) from discontinued operations, net of tax			1	1
Discontinued Operations [Member]
Non-interest expense:
Income (loss) from discontinued operations before income taxes			0	13
Income tax expense (benefit)			0	5
Income (loss) from discontinued operations, net of tax			$ 0	$ 8
Earnings (loss) per common share from discontinued operations:
Basic (in dollars per share)			$ 0	$ 0.01
Diluted (in dollars per share)			$ 0	$ 0.01
Subsequent Event [Member] | Regions Insurance Group Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 200
Earnings (loss) per common share from discontinued operations:
Common Equity Tier One Capital		$ 300
[1]	Certain per share amounts may not appear to reconcile due to rounding.

Securities (Schedule Of Amortiz

Securities (Schedule Of Amortized Cost, Gross Unrealized Gains And Losses, And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		$ 1,652	$ 1,702
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(41)	(44)
Debt Securities held to maturity		1,611	1,658
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		1	17
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		(27)	(8)
Debt Securities held to maturity, estimated fair value		1,585	1,667
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		23,701	23,605
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		35	82
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(651)	(284)
Available-for-sale debt securities, net carrying value		23,085	23,403
Available-for-sale Securities, Debt Securities		23,085	23,403
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		333	333
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(6)	(2)
Available-for-sale debt securities, net carrying value		327	331
Available-for-sale Securities, Debt Securities		327	331
Federal Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		42	28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0	0
Available-for-sale debt securities, net carrying value		42	28
Available-for-sale Securities, Debt Securities		42	28
Residential Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		1,010
Debt Securities held to maturity, estimated fair value		960
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		17,663	17,622
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		23	53
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(534)	(244)
Available-for-sale debt securities, net carrying value		17,152	17,431
Available-for-sale Securities, Debt Securities		17,152	17,431
Residential Non-Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		2	3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		0	0
Available-for-sale debt securities, net carrying value		2	3
Available-for-sale Securities, Debt Securities		2	3
Commercial Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		642
Debt Securities held to maturity, estimated fair value		625
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		3,742	3,739
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		1	5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(82)	(30)
Available-for-sale debt securities, net carrying value		3,661	3,714
Available-for-sale Securities, Debt Securities		3,661	3,714
Commercial Non-Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		774	787
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		3	4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(11)	(3)
Available-for-sale debt securities, net carrying value		766	788
Available-for-sale Securities, Debt Securities		766	788
Corporate and other debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		1,145	1,093
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax		8	20
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax		(18)	(5)
Available-for-sale debt securities, net carrying value		1,135	1,108
Available-for-sale Securities, Debt Securities		1,135	1,108
Residential Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		1,010	1,051
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(38)	(40)
Debt Securities held to maturity		972	1,011
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		1	12
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		(13)	(4)
Debt Securities held to maturity, estimated fair value		960	1,019
Commercial Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		642	651
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(3)	(4)
Debt Securities held to maturity		639	647
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		0	5
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		(14)	(4)
Debt Securities held to maturity, estimated fair value		$ 625	$ 648
[1]	The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013.

Securities (Schedule Of Cost An

Securities (Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Securities held to maturity, amortized cost	$ 1,652	$ 1,702
Debt Securities held to maturity, estimated fair value	1,585	1,667
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	48
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	48
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	964
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	952
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	418
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	414
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	90
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	90
Available-for-sale Debt Securities, Amortized Cost Basis	23,701	23,605
Available-for-sale Securities, Debt Securities	23,085	23,403
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	1,010
Debt Securities held to maturity, estimated fair value	960
Available-for-sale Debt Securities, Amortized Cost Basis	17,663	17,622
Available-for-sale Securities, Debt Securities	17,152	17,431
Residential Non-Agency [Member]
Available-for-sale Debt Securities, Amortized Cost Basis	2	3
Available-for-sale Securities, Debt Securities	2	3
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	642
Debt Securities held to maturity, estimated fair value	625
Available-for-sale Debt Securities, Amortized Cost Basis	3,742	3,739
Available-for-sale Securities, Debt Securities	3,661	3,714
Commercial Non-Agency [Member]
Available-for-sale Debt Securities, Amortized Cost Basis	774	787
Available-for-sale Securities, Debt Securities	$ 766	$ 788

Securities (Schedule Of Gross U

Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale and Held to Maturity) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Unrealized Loss And Fair Value On Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	$ 485	$ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	1,100	1,169
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(60)	(39)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	1,585	1,169
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(68)	(39)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	11,526	7,743
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(245)	(55)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	8,825	9,349
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(406)	(229)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	20,351	17,092
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(651)	(284)
US Treasury Securities [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	223	221
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	87	84
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3)	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	310	305
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(6)	(2)
Residential Agency [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	960	1,019
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(51)	(32)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	960	1,019
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(51)	(32)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	7,524	5,157
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(169)	(40)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	7,739	8,195
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(365)	(204)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	15,263	13,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(534)	(244)
Commercial Agency [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	485	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	140	150
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9)	(7)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	625	150
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(17)	(7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	2,600	1,666
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(50)	(10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	856	904
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(32)	(20)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	3,456	2,570
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(82)	(30)
Commercial Non-Agency [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	536	393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(9)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	59	61
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2)	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	595	454
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(11)	(3)
All Other Securities [Member]
Unrealized Loss And Fair Value On Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	643	306
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	84	105
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4)	(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value	727	411
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (18)	$ (5)

Securities (Schedule Of Gross R

Securities (Schedule Of Gross Realized Gains And Gross Realized Losses On Available For Sale Securities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 0	$ 1
Gross realized losses	0	(1)
Debt Securities available for sale gains (losses), net	$ 0	$ 0

Securities (Equity Investments)

Securities (Equity Investments) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Equity Investments without a Readily Determinable Fair Value [Roll Forward]
Carrying value, December 31, 2017	$ 31
Net additions	0
Downward adjustments for price changes and impairment	0
Upward adjustments for price changes	7	[1]
Carrying value, March 31, 2018	$ 38
[1]	Upward adjustments for the three months ended March 31, 2018 related to an observable transaction by the same issuer in an arm's length transaction for a similar ownership interest.

Securities (Narrative) (Details

Securities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)security	Dec. 31, 2017USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	$ 8,300	$ 8,100
Number of individual positions in unrealized loss position | security	1,364	1,059
Marketable Equity Securities carried at fair value	$ 525	$ 414
Cumulative Downward Adjustments for Equity Investments without a Determinable Fair Value	4
Cumulative Upward Adjustments for Equity Investments without a Determinable Fair Value	7
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	$ 49	$ 50

Loans and the Allowance for C47

Loans and the Allowance for Credit Losses (Schedule Of Loan Portfolio, Net Of Unearned Income) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 79,822	$ 79,947	$ 79,869
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	36,787	36,115
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	6,044	6,193
Commercial Real Estate Construction - Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	306	332
Commercial Investor Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,742	4,062
Commercial Investor Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,845	1,772
Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	13,892	14,061
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	9,916	10,164
Indirect-vehicles [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,310	3,326
Indirect-other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,611	1,467
Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,237	1,290
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,132	1,165
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	43,137	42,640	42,242
Total Investor Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,587	5,834	6,482
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 31,098	$ 31,473	$ 31,145

Loans and the Allowance for C48

Loans and the Allowance for Credit Losses (Analysis of the Allowance for Credit Losses by Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	$ 934	$ 1,091
Provision (credit) for loan and lease losses	(10)	70
Loan losses:
Charge-offs	(112)	(124)
Recoveries	28	24
Net loan losses	(84)	(100)
Total allowance for loan losses	840	1,061
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve For Unfunded Credit Commitments, beginning of period	53	69
Provision (credit) for unfunded credit losses	(4)	1
Reserve For Unfunded Credit Commitments, end of period	49	70
Allowance for Credit Losses, end of period	889	1,131
Portion of ending allowance for loan losses:
Allowance Individually Evaluated for Impairment	189	301
Allowance Collectively Evaluated for Impairment	651	760
Total allowance for loan losses	840	1,061
Portion of loan portfolio ending balance:
Loans Individually Evaluated for Impairment	1,272	1,989
Loans Collectively Evaluated for Impairment	78,550	77,880
Loans, net of unearned income	79,822	79,869	$ 79,947
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	591	753
Provision (credit) for loan and lease losses	(24)	26
Loan losses:
Charge-offs	(30)	(58)
Recoveries	10	6
Net loan losses	(20)	(52)
Total allowance for loan losses	547	727
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve For Unfunded Credit Commitments, beginning of period	49	64
Provision (credit) for unfunded credit losses	(4)	2
Reserve For Unfunded Credit Commitments, end of period	45	66
Allowance for Credit Losses, end of period	592	793
Portion of ending allowance for loan losses:
Allowance Individually Evaluated for Impairment	150	228
Allowance Collectively Evaluated for Impairment	397	499
Total allowance for loan losses	547	727
Portion of loan portfolio ending balance:
Loans Individually Evaluated for Impairment	700	1,103
Loans Collectively Evaluated for Impairment	42,437	41,139
Loans, net of unearned income	43,137	42,242	42,640
Total Investor Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	64	85
Provision (credit) for loan and lease losses	(4)	1
Loan losses:
Charge-offs	(8)	(1)
Recoveries	2	2
Net loan losses	(6)	1
Total allowance for loan losses	54	87
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve For Unfunded Credit Commitments, beginning of period	4	5
Provision (credit) for unfunded credit losses	0	(1)
Reserve For Unfunded Credit Commitments, end of period	4	4
Allowance for Credit Losses, end of period	58	91
Portion of ending allowance for loan losses:
Allowance Individually Evaluated for Impairment	10	17
Allowance Collectively Evaluated for Impairment	44	70
Total allowance for loan losses	54	87
Portion of loan portfolio ending balance:
Loans Individually Evaluated for Impairment	96	126
Loans Collectively Evaluated for Impairment	5,491	6,356
Loans, net of unearned income	5,587	6,482	5,834
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	279	253
Provision (credit) for loan and lease losses	18	43
Loan losses:
Charge-offs	(74)	(65)
Recoveries	16	16
Net loan losses	(58)	(49)
Total allowance for loan losses	239	247
Reserve For Unfunded Credit Commitments [Roll Forward]
Reserve For Unfunded Credit Commitments, beginning of period	0	0
Provision (credit) for unfunded credit losses	0	0
Reserve For Unfunded Credit Commitments, end of period	0	0
Allowance for Credit Losses, end of period	239	247
Portion of ending allowance for loan losses:
Allowance Individually Evaluated for Impairment	29	56
Allowance Collectively Evaluated for Impairment	210	191
Total allowance for loan losses	239	247
Portion of loan portfolio ending balance:
Loans Individually Evaluated for Impairment	476	760
Loans Collectively Evaluated for Impairment	30,622	30,385
Loans, net of unearned income	$ 31,098	$ 31,145	$ 31,473

Loans and the Allowance for C49

Loans and the Allowance for Credit Losses (Credit Quality Indicators) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 79,822	$ 79,947	$ 79,869
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	36,787	36,115
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	6,044	6,193
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	306	332
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,742	4,062
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,845	1,772
Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	13,892	14,061
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	9,916	10,164
Indirect-vehicles [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,310	3,326
Indirect-other consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,611	1,467
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,237	1,290
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,132	1,165
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	35,216	34,420
Pass [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,558	5,674
Pass [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	288	313
Pass [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,646	3,905
Pass [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,793	1,706
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	609	686
Special Mention [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	250	236
Special Mention [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3	3
Special Mention [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	48	63
Special Mention [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	15	19
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	598	605
Substandard [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	134	165
Substandard [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	10	10
Substandard [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	34	89
Substandard [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	37	46
Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	13,845	14,014
Accrual [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	9,847	10,095
Accrual [Member] | Indirect-vehicles [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,310	3,326
Accrual [Member] | Indirect-other consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,611	1,467
Accrual [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,237	1,290
Accrual [Member] | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,132	1,165
Non Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	364	404
Non Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	102	118
Non Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5	6
Non Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	14	5
Non Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	1
Non Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	47	47
Non Accrual [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	69	69
Non Accrual [Member] | Indirect-vehicles [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0
Non Accrual [Member] | Indirect-other consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0
Non Accrual [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0
Non Accrual [Member] | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	43,137	42,640	42,242
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	41,062	40,407
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	862	925
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	742	780
Commercial Portfolio Segment [Member] | Non Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	471	528
Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,587	5,834	6,482
Total Investor Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,439	5,611
Total Investor Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	63	82
Total Investor Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	71	135
Total Investor Real Estate [Member] | Non Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	14	6
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	31,098	31,473	$ 31,145
Consumer Portfolio Segment [Member] | Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	30,982	31,357
Consumer Portfolio Segment [Member] | Non Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 116	$ 116

Loans and the Allowance for C50

Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	$ 265	$ 291
Total 30 plus DPD, Accrual Loans	691	724
Total Accrual	79,221	79,297
Nonaccrual	601	650
Loans, net of unearned income	79,822	79,947	$ 79,869
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	5	4
Total 30 plus DPD, Accrual Loans	75	39
Total Accrual	36,423	35,711
Nonaccrual	364	404
Loans, net of unearned income	36,787	36,115
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	1	1
Total 30 plus DPD, Accrual Loans	29	27
Total Accrual	5,942	6,075
Nonaccrual	102	118
Loans, net of unearned income	6,044	6,193
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Total 30 plus DPD, Accrual Loans	0	0
Total Accrual	301	326
Nonaccrual	5	6
Loans, net of unearned income	306	332
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	6	5
Total 30 plus DPD, Accrual Loans	104	66
Total Accrual	42,666	42,112
Nonaccrual	471	528
Loans, net of unearned income	43,137	42,640
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	1
Total 30 plus DPD, Accrual Loans	1	3
Total Accrual	3,728	4,057
Nonaccrual	14	5
Loans, net of unearned income	3,742	4,062
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Total 30 plus DPD, Accrual Loans	29	0
Total Accrual	1,845	1,771
Nonaccrual	0	1
Loans, net of unearned income	1,845	1,772
Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	1
Total 30 plus DPD, Accrual Loans	30	3
Total Accrual	5,573	5,828
Nonaccrual	14	6
Loans, net of unearned income	5,587	5,834
Residential First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	196	216
Total 30 plus DPD, Accrual Loans	316	396
Total Accrual	13,845	14,014
Nonaccrual	47	47
Loans, net of unearned income	13,892	14,061
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	33	37
Total 30 plus DPD, Accrual Loans	117	117
Total Accrual	9,847	10,095
Nonaccrual	69	69
Loans, net of unearned income	9,916	10,164
Indirect-vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	8	9
Total 30 plus DPD, Accrual Loans	57	70
Total Accrual	3,310	3,326
Nonaccrual	0	0
Loans, net of unearned income	3,310	3,326
Indirect-other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Total 30 plus DPD, Accrual Loans	13	14
Total Accrual	1,611	1,467
Nonaccrual	0	0
Loans, net of unearned income	1,611	1,467
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	17	19
Total 30 plus DPD, Accrual Loans	34	37
Total Accrual	1,237	1,290
Nonaccrual	0	0
Loans, net of unearned income	1,237	1,290
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	5	4
Total 30 plus DPD, Accrual Loans	20	21
Total Accrual	1,132	1,165
Nonaccrual	0	0
Loans, net of unearned income	1,132	1,165
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 plus DPD, Accrual Loans	259	285
Total 30 plus DPD, Accrual Loans	557	655
Total Accrual	30,982	31,357
Nonaccrual	116	116
Loans, net of unearned income	31,098	31,473
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	150	157
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	28	7
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	3	8
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	31	15
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	0	1
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	29	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	29	1
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	42	85
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	22	27
Financing Receivables, 60 to 89 Days Past Due [Member] | Indirect-vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	10	13
Financing Receivables, 60 to 89 Days Past Due [Member] | Indirect-other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	5	5
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	7	7
Financing Receivables, 60 to 89 Days Past Due [Member] | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	4	4
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	90	141
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	276	276
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	42	28
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	25	18
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	67	46
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	1	1
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	1	1
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	78	95
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	62	53
Financing Receivables, 30 to 59 Days Past Due [Member] | Indirect-vehicles [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	39	48
Financing Receivables, 30 to 59 Days Past Due [Member] | Indirect-other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	8	9
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	10	11
Financing Receivables, 30 to 59 Days Past Due [Member] | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	11	13
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total 30 plus DPD, Accrual Loans	$ 208	$ 229

Loans and the Allowance for C51

Loans and the Allowance for Credit Losses (Impaired Financing Receivables) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 1,405		$ 1,696
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	133		138
Impaired Financing Receivable, Recorded Investment	[3]	1,272		1,558
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	50		50
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	1,222		1,508
Impaired Financing Receivable, Related Allowance		$ 189		$ 226
Impaired Financing Receivable, Coverage Percentage	[4]	22.90%		21.50%
Impaired Financing Receivable, Average Recorded Investment		$ 1,360	$ 1,975
Impaired Financing Receivable, Interest Income Recognized		12	12
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	622		$ 634
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	88		88
Impaired Financing Receivable, Recorded Investment	[3]	534		546
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	31		30
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	503		516
Impaired Financing Receivable, Related Allowance		$ 111		$ 122
Impaired Financing Receivable, Coverage Percentage	[4]	32.00%		33.10%
Impaired Financing Receivable, Average Recorded Investment		$ 533	819
Impaired Financing Receivable, Interest Income Recognized		3	2
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	176		$ 223
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	16		20
Impaired Financing Receivable, Recorded Investment	[3]	160		203
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	18		20
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	142		183
Impaired Financing Receivable, Related Allowance		$ 37		$ 46
Impaired Financing Receivable, Coverage Percentage	[4]	30.10%		29.60%
Impaired Financing Receivable, Average Recorded Investment		$ 166	264
Impaired Financing Receivable, Interest Income Recognized		3	1
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	6		$ 8
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		1
Impaired Financing Receivable, Recorded Investment	[3]	6		7
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	6		7
Impaired Financing Receivable, Related Allowance		$ 2		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	33.30%		50.00%
Impaired Financing Receivable, Average Recorded Investment		$ 6	6
Impaired Financing Receivable, Interest Income Recognized		0	0
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	804		$ 865
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	104		109
Impaired Financing Receivable, Recorded Investment	[3]	700		756
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	49		50
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	651		706
Impaired Financing Receivable, Related Allowance		$ 150		$ 171
Impaired Financing Receivable, Coverage Percentage	[4]	31.60%		32.40%
Impaired Financing Receivable, Average Recorded Investment		$ 705	1,089
Impaired Financing Receivable, Interest Income Recognized		6	3
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	77		$ 69
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	10		3
Impaired Financing Receivable, Recorded Investment	[3]	67		66
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	1		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	66		66
Impaired Financing Receivable, Related Allowance		$ 7		$ 5
Impaired Financing Receivable, Coverage Percentage	[4]	22.10%		11.60%
Impaired Financing Receivable, Average Recorded Investment		$ 76	91
Impaired Financing Receivable, Interest Income Recognized		1	1
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	30		$ 30
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	1		0
Impaired Financing Receivable, Recorded Investment	[3]	29		30
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	29		30
Impaired Financing Receivable, Related Allowance		$ 3		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	13.30%		10.00%
Impaired Financing Receivable, Average Recorded Investment		$ 30	33
Impaired Financing Receivable, Interest Income Recognized		0	0
Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	107		$ 99
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	11		3
Impaired Financing Receivable, Recorded Investment	[3]	96		96
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	1		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	95		96
Impaired Financing Receivable, Related Allowance		$ 10		$ 8
Impaired Financing Receivable, Coverage Percentage	[4]	19.60%		11.10%
Impaired Financing Receivable, Average Recorded Investment		$ 106	124
Impaired Financing Receivable, Interest Income Recognized		1	1
Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	235		$ 461
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	16		24
Impaired Financing Receivable, Recorded Investment	[3]	219		437
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	219		437
Impaired Financing Receivable, Related Allowance		$ 21		$ 42
Impaired Financing Receivable, Coverage Percentage	[4]	15.70%		14.30%
Impaired Financing Receivable, Average Recorded Investment		$ 288	455
Impaired Financing Receivable, Interest Income Recognized		2	4
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	250		$ 261
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	2		2
Impaired Financing Receivable, Recorded Investment	[3]	248		259
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	248		259
Impaired Financing Receivable, Related Allowance		$ 8		$ 5
Impaired Financing Receivable, Coverage Percentage	[4]	4.00%		2.70%
Impaired Financing Receivable, Average Recorded Investment		$ 252	295
Impaired Financing Receivable, Interest Income Recognized		3	4
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	1		$ 1
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	1		1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	1		1
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	0.00%		0.00%
Impaired Financing Receivable, Average Recorded Investment		$ 1	2
Impaired Financing Receivable, Interest Income Recognized		0	0
Other consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	8		$ 9
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	8		9
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	8		9
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	0.00%		0.00%
Impaired Financing Receivable, Average Recorded Investment		$ 8	10
Impaired Financing Receivable, Interest Income Recognized		0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	494		$ 732
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	18		26
Impaired Financing Receivable, Recorded Investment	[3]	476		706
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	476		706
Impaired Financing Receivable, Related Allowance		$ 29		$ 47
Impaired Financing Receivable, Coverage Percentage	[4]	9.50%		10.00%
Impaired Financing Receivable, Average Recorded Investment		$ 549	762
Impaired Financing Receivable, Interest Income Recognized		5	$ 8
Non Accrual [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	633		$ 679
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	112		109
Impaired Financing Receivable, Recorded Investment	[3]	521		570
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	50		49
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	471		521
Impaired Financing Receivable, Related Allowance		$ 132		$ 149
Impaired Financing Receivable, Coverage Percentage	[4]	38.50%		38.00%
Non Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 441		$ 480
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	81		80
Impaired Financing Receivable, Recorded Investment	[3]	360		400
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	31		29
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	329		371
Impaired Financing Receivable, Related Allowance		$ 89		$ 103
Impaired Financing Receivable, Coverage Percentage	[4]	38.50%		38.10%
Non Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 113		$ 133
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	11		15
Impaired Financing Receivable, Recorded Investment	[3]	102		118
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	18		20
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	84		98
Impaired Financing Receivable, Related Allowance		$ 33		$ 38
Impaired Financing Receivable, Coverage Percentage	[4]	38.90%		39.80%
Non Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 5		$ 7
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		1
Impaired Financing Receivable, Recorded Investment	[3]	5		6
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	5		6
Impaired Financing Receivable, Related Allowance		$ 2		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	40.00%		57.10%
Non Accrual [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 559		$ 620
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	92		96
Impaired Financing Receivable, Recorded Investment	[3]	467		524
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	49		49
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	418		475
Impaired Financing Receivable, Related Allowance		$ 124		$ 144
Impaired Financing Receivable, Coverage Percentage	[4]	38.60%		38.70%
Non Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 22		$ 6
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	8		1
Impaired Financing Receivable, Recorded Investment	[3]	14		5
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	1		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	13		5
Impaired Financing Receivable, Related Allowance		$ 5		$ 2
Impaired Financing Receivable, Coverage Percentage	[4]	59.10%		50.00%
Non Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 1		$ 1
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	1		0
Impaired Financing Receivable, Recorded Investment	[3]	0		1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	0		1
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	100.00%		0.00%
Non Accrual [Member] | Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 23		$ 7
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	9		1
Impaired Financing Receivable, Recorded Investment	[3]	14		6
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	1		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	13		6
Impaired Financing Receivable, Related Allowance		$ 5		$ 2
Impaired Financing Receivable, Coverage Percentage	[4]	60.90%		42.90%
Non Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 41		$ 42
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	10		11
Impaired Financing Receivable, Recorded Investment	[3]	31		31
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	31		31
Impaired Financing Receivable, Related Allowance		$ 3		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	31.70%		33.30%
Non Accrual [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 10		$ 10
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	1		1
Impaired Financing Receivable, Recorded Investment	[3]	9		9
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	9		9
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	10.00%		10.00%
Non Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 51		$ 52
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	11		12
Impaired Financing Receivable, Recorded Investment	[3]	40		40
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]	40		40
Impaired Financing Receivable, Related Allowance		$ 3		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	27.50%		28.80%
Accrual [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 772		$ 1,017
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	21		29
Impaired Financing Receivable, Recorded Investment	[3]	751		988
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			1
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			987
Impaired Financing Receivable, Related Allowance		$ 57		$ 77
Impaired Financing Receivable, Coverage Percentage	[4]	10.10%		10.40%
Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 181		$ 154
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	7		8
Impaired Financing Receivable, Recorded Investment	[3]	174		146
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			1
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			145
Impaired Financing Receivable, Related Allowance		$ 22		$ 19
Impaired Financing Receivable, Coverage Percentage	[4]	16.00%		17.50%
Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 63		$ 90
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	5		5
Impaired Financing Receivable, Recorded Investment	[3]	58		85
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			85
Impaired Financing Receivable, Related Allowance		$ 4		$ 8
Impaired Financing Receivable, Coverage Percentage	[4]	14.30%		14.40%
Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 1		$ 1
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	1		1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			1
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	0.00%		0.00%
Accrual [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 245		$ 245
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	12		13
Impaired Financing Receivable, Recorded Investment	[3]	233		232
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			1
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			231
Impaired Financing Receivable, Related Allowance		$ 26		$ 27
Impaired Financing Receivable, Coverage Percentage	[4]	15.50%		16.30%
Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 55		$ 63
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	2		2
Impaired Financing Receivable, Recorded Investment	[3]	53		61
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			61
Impaired Financing Receivable, Related Allowance		$ 2		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	7.30%		7.90%
Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 29		$ 29
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	29		29
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			29
Impaired Financing Receivable, Related Allowance		$ 3		$ 3
Impaired Financing Receivable, Coverage Percentage	[4]	10.30%		10.30%
Accrual [Member] | Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 84		$ 92
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	2		2
Impaired Financing Receivable, Recorded Investment	[3]	82		90
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			90
Impaired Financing Receivable, Related Allowance		$ 5		$ 6
Impaired Financing Receivable, Coverage Percentage	[4]	8.30%		8.70%
Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 194		$ 419
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	6		13
Impaired Financing Receivable, Recorded Investment	[3]	188		406
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			406
Impaired Financing Receivable, Related Allowance		$ 18		$ 39
Impaired Financing Receivable, Coverage Percentage	[4]	12.40%		12.40%
Accrual [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 240		$ 251
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	1		1
Impaired Financing Receivable, Recorded Investment	[3]	239		250
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			250
Impaired Financing Receivable, Related Allowance		$ 8		$ 5
Impaired Financing Receivable, Coverage Percentage	[4]	3.80%		2.40%
Accrual [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 1		$ 1
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	1		1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			1
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	0.00%		0.00%
Accrual [Member] | Other consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 8		$ 9
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	0		0
Impaired Financing Receivable, Recorded Investment	[3]	8		9
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			9
Impaired Financing Receivable, Related Allowance		$ 0		$ 0
Impaired Financing Receivable, Coverage Percentage	[4]	0.00%		0.00%
Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	[1]	$ 443		$ 680
Impaired Financing Receivable Chargeoffs And Payments Applied	[2]	7		14
Impaired Financing Receivable, Recorded Investment	[3]	436		666
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	[3]			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[3]			666
Impaired Financing Receivable, Related Allowance		$ 26		$ 44
Impaired Financing Receivable, Coverage Percentage	[4]	7.40%		8.50%
[1]	Unpaid principal balance represents the contractual obligation due from the customer and includes the net book value plus charge-offs and payments applied.
[2]	Charge-offs and payments applied represents cumulative partial charge-offs taken, as well as interest payments received that have been applied against the outstanding principal balance.
[3]	Book value represents the unpaid principal balance less charge-offs and payments applied; it is shown before any allowance for loan losses.
[4]	Coverage % represents charge-offs and payments applied plus the related allowance as a percent of the unpaid principal balance.

Loans and the Allowance for C52

Loans and the Allowance for Credit Losses (Loans By Class Modified In TDR) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)obligor	Mar. 31, 2017USD ($)obligorObligator
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	154	252
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 206	$ 187
Increase in Allowance at Modification	$ 4	$ 6
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	29	31
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 164	$ 99
Increase in Allowance at Modification	$ 2	$ 3
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	18	31
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 14	$ 28
Increase in Allowance at Modification	$ 0	$ 1
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | Obligator		2
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 1
Increase in Allowance at Modification		$ 0
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	10	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 19	$ 19
Increase in Allowance at Modification	$ 1	$ 0
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor		3
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 26
Increase in Allowance at Modification		$ 1
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	53	49
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 8	$ 8
Increase in Allowance at Modification	$ 1	$ 1
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	17	58
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1	$ 5
Increase in Allowance at Modification	$ 0	$ 0
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	14	19
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Indirect-vehicles and other consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	13	47
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 1
Increase in Allowance at Modification	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	47	64
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 178	$ 128
Increase in Allowance at Modification	$ 2	$ 4
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	10	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 19	$ 45
Increase in Allowance at Modification	$ 1	$ 1
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	97	173
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 9	$ 14
Increase in Allowance at Modification	$ 1	$ 1

Loans and the Allowance for C53

Loans and the Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Performing TDR and certain non-restructured interest-only loan sale	$ 254
Amount of loans first reported as new TDRs	171	$ 128
Re-Defaulted Commercial And Investor Real Estate Loans Modified In Tdr During Period And On Non Accrual Status	118
Total Restructured Binding Unfunded Commitment	21
Federal Home Loan Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged loans	22,100
Federal Reserve Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged loans	22,100
Indirect-other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
loans purchased	$ 70	$ 4
Residential First Mortgage [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing period for consumer loans, in years	15 years
Residential First Mortgage [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing period for consumer loans, in years	30 years

Servicing of Financial Assets54

Servicing of Financial Assets (Analysis Of Residential Mortgage Servicing Rights Under The Fair Value Measurement Method) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value, beginning of period		$ 336	$ 324
Additions		8	8
Increase (decrease) in fair value, due to change in valuation inputs or assumptions		22	4
Increase (decrease) in fair value, economic amortization associated with borrower repayments	[1]	(10)	(10)
Carrying value, end of period		$ 356	$ 326
[1]	"Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns.

Servicing of Financial Assets55

Servicing of Financial Assets (Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Residential Mortgage Servicing Rights) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)basis_point	Mar. 31, 2017USD ($)basis_point
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance	$ 31,641	$ 30,960
Weighted-average prepayment speed (CPR; percentage)	9.00%	7.60%
Estimated impact on fair value of a 10% increase in prepayment speed	$ (24)	$ (19)
Estimated impact on fair value of a 20% increase in prepayment speed	$ (43)	$ (34)
Option-adjusted spread (basis points) | basis_point	842	1,058
Estimated impact on fair value of a 10% increase in other assumptions	$ (12)	$ (13)
Estimated impact on fair value of a 20% increase in other assumptions	$ (24)	$ (27)
Weighted-average coupon interest rate	4.10%	4.20%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life	280 months	280 months
Weighted Average Servicing Fee Basis Points | basis_point	27.3	27.4

Servicing of Financial Assets56

Servicing of Financial Assets (Schedule Of Fees Resulting From The Servicing Of Mortgage Loans) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Transfers and Servicing of Financial Assets [Abstract]
Servicing related fees and other ancillary income	$ 23	$ 23

Servicing of Financial Assets57

Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	Apr. 28, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Unpaid Principal Balance of Outstanding Underlying MSRs Purchased	$ 2,700
Payments to Acquire Mortgage Servicing Rights (MSR)	$ 30	$ 2	$ 8
Unpaid principal balance		31,641	$ 30,960
DUS Portfolio [Member]
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance		2,800		$ 2,900
Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost		47		48
Loss Share Guarantee		$ 4		$ 4

Goodwill (Schedule of Goodwill)

Goodwill (Schedule of Goodwill) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)unit	Dec. 31, 2017USD ($)
Goodwill [Line Items]
Goodwill	$ 4,904	$ 4,904
Number of reporting units | unit	3
Corporate Bank [Member]
Goodwill [Line Items]
Goodwill	$ 2,474	2,474
Consumer Bank [Member]
Goodwill [Line Items]
Goodwill	1,978	1,978
Wealth Management [Member]
Goodwill [Line Items]
Goodwill	$ 452	$ 452

Preferred Stock Issuances (Deta

Preferred Stock Issuances (Details) - USD ($) $ in Millions		3 Months Ended	120 Months Ended
		Mar. 31, 2018	Sep. 15, 2024	Dec. 31, 2017
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value		$ 1,000
Preferred Stock, Carrying Amount		$ 820		$ 820
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.375%
Preferred Stock, Liquidation Preference, Value		$ 500
Preferred Stock, Carrying Amount		$ 387		387
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	[1]	6.375%
Preferred Stock, Liquidation Preference, Value		$ 500
Preferred Stock, Carrying Amount		$ 433		$ 433
Forecast [Member] | Series B Preferred Stock Dividend Scenario 1 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.375%
Plus 3-Month LIBOR [Member] | Forecast [Member] | Series B Preferred Stock Dividend Scenario 2 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage			3.536%
[1]	Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375%, and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536%.

Schedule of Accumulated Other C

Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	$ (749)	$ (550)
Other comprehensive income (loss), net of tax	(402)	(15)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(1,151)	(565)
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(33)	(33)
Other comprehensive income (loss), net of tax	2	2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(31)	(31)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(153)	(106)
Other comprehensive income (loss), net of tax	(310)	1
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(463)	(105)
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(51)	11
Other comprehensive income (loss), net of tax	(100)	(23)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	(151)	(12)
Accumulated Defined Benefit Plans Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	(512)	(422)
Other comprehensive income (loss), net of tax	6	5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	$ (506)	$ (417)

Reclassification from Accumulat

Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Income (Expense), Net		$ 909	$ 859
Other Noninterest Expense		(225)	(220)
Income tax (expense) benefit		(128)	(127)
Net income		414	301
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	[1]	(1)	11
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Income (Expense), Net	[1]	(3)	(3)
Income tax (expense) benefit	[1]	1	1
Net income	[1]	(2)	(2)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses), net	[1]	0	0
Income tax (expense) benefit	[1]	0	0
Net income	[1]	0	0
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Income (Expense), Net	[1]	11	31
Income tax (expense) benefit	[1]	(3)	(12)
Net income	[1]	8	19
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Noninterest Expense	[1],[2]	(9)	(9)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Noninterest Expense	[1]	(9)	(9)
Income tax (expense) benefit	[1]	2	3
Net income	[1]	$ (7)	$ (6)
[1]	(1) Amounts in parentheses indicate reductions to net income.
[2]	(2) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost and is included in other non-interest expense on the consolidated statements of income (see Note 9 for additional details).

Stockholders' Equity And Accu62

Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions		May 08, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 15, 2024	Dec. 15, 2017	Jun. 28, 2017
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Dividends, Preferred Stock			$ 16,000,000	$ 16,000,000
Cash dividend declared (in dollars per share)			$ 0.09	$ 0.065
Stock repurchase plan (in shares)							$ 1,470,000,000
Shares repurchased (in shares)			78.1
ValueofTotalCommonStockRepurchasedUnderCurrentRepurchaseProgram			$ 1,200,000,000
Payments for Repurchase of Common Stock			$ 235,000,000	$ 150,000,000
Subsequent Event [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Shares repurchased (in shares)		6.9
Payments for Repurchase of Common Stock		$ 129,100,000
Series B Preferred Stock Dividend Scenario 1 [Member] | Forecast [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Dividend Rate, Percentage					6.375%
Series B Preferred Stock Dividend Scenario 2 [Member] | Forecast [Member] | Plus 3-Month LIBOR [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage					3.536%
Series A Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.375%
Dividends, Preferred Stock			$ 8,000,000	8,000,000
ExcessofRedemptionAmountOverCarryingAmount						$ 113,000,000
PreferredDividendsReductiontoRetainedEarningsatRedemption						100,000,000
PreferredStockIssuanceCostsReductiontoNetIncome						$ 13,000,000
Series A Preferred Stock [Member] | Debt Instrument, Redemption, Period One [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Redemption Terms			90 days
Series B Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Dividend Rate, Percentage	[1]		6.375%
Dividends, Preferred Stock			$ 8,000,000	$ 8,000,000
Series B Preferred Stock [Member] | Forecast [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
ExcessofRedemptionAmountOverCarryingAmount					$ 67,000,000
PreferredDividendsReductiontoRetainedEarningsatRedemption					52,000,000
PreferredStockIssuanceCostsReductiontoNetIncome					$ 15,000,000
Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, liquidation preference per share (in dollars per share)			$ 1,000
Preferred Stock [Member] | Depositary Shares [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, liquidation preference per share (in dollars per share)			$ 25
[1]	Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375%, and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536%.

Earnings (Loss) Per Common Sh63

Earnings (Loss) Per Common Share (Computation Of Basic And Diluted Earnings (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Numerator:
Income from continuing operations		$ 414	$ 293
Preferred stock dividends		(16)	(16)
Net Income Loss From Continuing Operations Available To Common Stockholders Basic		398	277
Income (loss) from discontinued operations, net of tax		0	8
Net income available to common shareholders		$ 398	$ 285
Denominator:
Weighted-average common shares outstanding—basic (in shares)		1,127	1,209
Potential common shares (in shares)		14	15
Weighted-average common shares outstanding—diluted (in shares)		1,141	1,224
Earnings per common share from continuing operations:
Basic (in dollars per share)	[1]	$ 0.35	$ 0.23
Diluted (in dollars per share)	[1]	0.35	0.23
Earning (Loss) Per Common Share From Discontinued Operations:
Basic (in dollars per share)	[1]	0	0.01
Diluted (in dollars per share)	[1]	0	0.01
Earnings per common share:
Basic (in dollars per share)	[1]	0.35	0.24
Diluted (in dollars per share)	[1]	$ 0.35	$ 0.23
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)		6	15
[1]	Certain per share amounts may not appear to reconcile due to rounding.

Pension and Other Postretirem64

Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 10	$ 9
Interest Cost	19	19
Expected Return on Plan Assets	(37)	(35)
Amortization of Actuarial Loss	9	9
Net Periodic Pension Cost (Credit)	1	2
Contributions by Employer	100
Qualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	9	8
Interest Cost	18	18
Expected Return on Plan Assets	(37)	(35)
Amortization of Actuarial Loss	8	8
Net Periodic Pension Cost (Credit)	(2)	(1)
Nonqualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	1
Interest Cost	1	1
Expected Return on Plan Assets	0	0
Amortization of Actuarial Loss	1	1
Net Periodic Pension Cost (Credit)	$ 3	$ 3

Derivative Financial Instrume65

Derivative Financial Instruments and Hedging Activities (Schedule of Derivative Instruments Notional and Fair Value) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount		$ 106,058	$ 81,449
Estimated Fair Value, Gain	[1]	248	394
Estimated Fair Value, Loss	[1]	396	641
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Policy Election that were Offset Under Master Netting Agreements		112	107
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements		112	107
Derivative Asset, Collateral, Obligation to Return Cash, Offset		30	34
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		113	131
Derivative Asset	[2]	106	253
Derivative Liabilities	[2]	171	403
Derivative, Collateral, Right to Reclaim Securities		49	50
Derivative, Collateral, Right to Reclaim Cash			257
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		11,422	9,885
Estimated Fair Value, Gain	[1]		6
Estimated Fair Value, Loss	[1]		231
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		94,636	71,564
Estimated Fair Value, Gain	[1]	248	388
Estimated Fair Value, Loss	[1]	396	410
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		41,166	40,841
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]	140	308
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]	307	342
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		5,063	4,598
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]	39	23
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]	23	15
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		42,341	20,404
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]	10	6
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]	11	5
Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		6,066	5,721
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]	59	51
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]	55	48
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		3,597	3,060
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]		1
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]		43
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		$ 7,825	6,825
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Gain	[1]		5
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value, Loss	[1]		$ 188
[1]	Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities on the consolidated balance sheets. There is no fair value presented for contracts that are characterized as settled daily.
[2]	As of March 31, 2018, financial instruments posted of $49 million were not offset in the consolidated balance sheets. As of December 31, 2017, cash collateral posted of $257 million and financial instruments posted of $50 million were not offset in the consolidated balance sheets.

Derivative Financial Instrume66

Derivative Financial Instruments And Hedging Activities (Schedule Of The Effect Of Derivative Instruments On The Statements Of Operations) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Debt securities - taxable		$ 154	$ 147
Loans, including fees		851	773
Deposits		49	35
Long-term borrowings		72	50
Other		225	220
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Taxable Debt Securities in Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Related to Interest Settlements on Derivatives		0	(1)
Gain or (Loss) Recognized in Income on Derivatives		3	0
Gain or (Loss) Recognized in Income on Related Hedged Item		(3)	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		0	(1)
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Loans Including Fees in Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Related to Interest Settlements on Derivatives		0	0
Gain or (Loss) Recognized in Income on Derivatives		0	0
Gain or (Loss) Recognized in Income on Related Hedged Item		0	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		0	0
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Deposits in Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Related to Interest Settlements on Derivatives		0	0
Gain or (Loss) Recognized in Income on Derivatives		0	0
Gain or (Loss) Recognized in Income on Related Hedged Item		0	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		0	0
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Long-term Borrowings In Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Related to Interest Settlements on Derivatives		(1)	1
Gain or (Loss) Recognized in Income on Derivatives		(32)	0
Gain or (Loss) Recognized in Income on Related Hedged Item		32	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		(1)	1
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Other in Non-Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Related to Interest Settlements on Derivatives		0	0
Gain or (Loss) Recognized in Income on Derivatives		0	0
Gain or (Loss) Recognized in Income on Related Hedged Item		0	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings		0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Taxable Debt Securities in Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income	[1]	0	0
Net Income (Expense) Recognized on Cash Flow Hedges	[2]	0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Loans Including Fees in Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income	[1]	11	31
Net Income (Expense) Recognized on Cash Flow Hedges	[2]	11	31
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Deposits in Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income	[1]	0	0
Net Income (Expense) Recognized on Cash Flow Hedges	[2]	0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Long-term Borrowings In Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income	[1]	0	0
Net Income (Expense) Recognized on Cash Flow Hedges	[2]	0	0
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Other in Non-Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income	[1]	0	0
Net Income (Expense) Recognized on Cash Flow Hedges	[2]	$ 0	$ 0
[1]	Pre-tax
[2]	See Note 7 for gain or (loss) recognized for cash flow hedges in AOCI.

Derivative Financial Instrume67

Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) $ in Millions	Mar. 31, 2018USD ($)
Designated as Hedging Item [Member] | Debt Available-for-sale Securities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Assets	$ 210
Hedge Liability, Fair Value Hedge, Cumulative Basis Adjustment	(3)
Designated as Hedging Item [Member] | Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Liabilities	(3,321)
Hedge Asset, Fair Value Hedge, Cumulative Basis Adjustment	82
Not Designated as Hedging Item [Member] | Debt Available-for-sale Securities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Assets	577
Hedge Asset, Fair Value Hedge, Cumulative Basis Adjustment	7
Not Designated as Hedging Item [Member] | Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Liabilities	(101)
Hedge Asset, Fair Value Hedge, Cumulative Basis Adjustment	$ 0

Derivative Financial Instrume68

Derivative Financial Instruments and Hedging Activities (Schedule of Gains (Losses) Recognized Related to Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments		$ (1)	$ (10)
Capital Markets Fee Income [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	[1]	17	(2)
Capital Markets Fee Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	[1]	7	2
Capital Markets Fee Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	[1]	7	2
Capital Markets Fee Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	[1]	1	2
Capital Markets Fee Income [Member] | Other Contract [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	[1]	2	(8)
Mortgage Income [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments		(18)	(8)
Mortgage Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments		(18)	(2)
Mortgage Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments		3	2
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments		$ (3)	$ (8)
[1]	Capital markets fee income and other is included in Other income on the consolidated statements of income.

Derivative Financial Instrume69

Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Terminated Cash Flow Hedge Unrealized Gain (Loss) To Be Reclassified From OCI, After Tax Amount	$ 136	$ 154
Cash Flow Hedge Pre Tax Income (Loss)	15	$ 19
Cash flow hedge gain expected to be reclassified from other comprehensive income into earnings within the next 12 months	4
Pre-tax net income related to amortization of discontinued cash flow hedges	$ 50
Maximum Length of Time Hedged in Cash Flow Hedge	7 years
Derivative, Notional Amount	$ 106,058		$ 81,449
Credit risk, defined as all positive exposures not collateralized	94		251
Maximum potential future exposure on swap participations	400
Aggregate fair value of all derivative instruments with credit risk	71		91
Posted collateral related to derivative instruments with credit risk	74		90
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	11,422		9,885
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	94,636		71,564
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	41,166		40,841
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	372		197
Forward Sale Commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	737		481
Forward Rate Commitments and Futures Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	5,000		4,800
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 7,825		$ 6,825

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis And Non-Recurring Basis) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		$ 23,085	$ 23,403
Marketable Equity Securities carried at fair value		525	414
Residential mortgage servicing rights at fair value		356	336	$ 326	$ 324
Derivative Asset	[1]	106	253
Derivative Liabilities	[1]	171	403
Loans held for sale		282	325
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		23,085	23,403
Mortgages Held-for-sale, Fair Value Disclosure		282	325
Marketable Equity Securities carried at fair value	[2]	525	414
Residential mortgage servicing rights at fair value		356	336
Derivative Asset		248	394
Derivative Liabilities		396	641
Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale		7	20
Equity Investments without a Readily Determinable Fair Value	[3]	13	0
Fair Value Foreclosed Property And Other Real Estate And Equipment Nonrecurring Basis		22	33
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		327	331
Derivative Asset		2	2
Derivative Liabilities		2	2
Loans held for sale		0	0
Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		327	331
Mortgages Held-for-sale, Fair Value Disclosure		0	0
Marketable Equity Securities carried at fair value	[2]	525	414
Residential mortgage servicing rights at fair value		0	0
Derivative Asset		2	2
Derivative Liabilities		2	2
Level 1 [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale		0	0
Equity Investments without a Readily Determinable Fair Value	[3]	0	0
Fair Value Foreclosed Property And Other Real Estate And Equipment Nonrecurring Basis		0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		22,753	23,066
Derivative Asset		233	387
Derivative Liabilities		394	639
Loans held for sale		439	328
Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		22,753	23,066
Mortgages Held-for-sale, Fair Value Disclosure		282	325
Marketable Equity Securities carried at fair value	[2]	0	0
Residential mortgage servicing rights at fair value		0	0
Derivative Asset		233	387
Derivative Liabilities		394	639
Level 2 [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale		0	0
Equity Investments without a Readily Determinable Fair Value	[3]	0	0
Fair Value Foreclosed Property And Other Real Estate And Equipment Nonrecurring Basis		18	24
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		5	6
Derivative Asset		13	5
Derivative Liabilities		0	0
Loans held for sale		13	20
Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	5	6
Mortgages Held-for-sale, Fair Value Disclosure	[4]	0	0
Marketable Equity Securities carried at fair value	[2],[4]	0	0
Residential mortgage servicing rights at fair value	[4]	356	336
Derivative Asset	[4]	13	5
Derivative Liabilities	[4]	0	0
Level 3 [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[4]	7	20
Equity Investments without a Readily Determinable Fair Value	[3],[4]	13	0
Fair Value Foreclosed Property And Other Real Estate And Equipment Nonrecurring Basis	[4]	4	9
Interest Rate Swaps [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		140	314
Derivative Liabilities		307	573
Interest Rate Swaps [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Interest Rate Swaps [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		140	314
Derivative Liabilities		307	573
Interest Rate Swaps [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	[4]	0	0
Derivative Liabilities	[4]	0	0
Interest Rate Options [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		39	23
Derivative Liabilities		23	15
Interest Rate Options [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Interest Rate Options [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		26	18
Derivative Liabilities		23	15
Interest Rate Options [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	[4]	13	5
Derivative Liabilities	[4]	0	0
Interest Rate Futures And Forward Commitments [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		10	6
Derivative Liabilities		11	5
Interest Rate Futures And Forward Commitments [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0	0
Derivative Liabilities		0	0
Interest Rate Futures And Forward Commitments [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		10	6
Derivative Liabilities		11	5
Interest Rate Futures And Forward Commitments [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	[4]	0	0
Derivative Liabilities	[4]	0	0
Other Contract [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		59	51
Derivative Liabilities		55	48
Other Contract [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		2	2
Derivative Liabilities		2	2
Other Contract [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		57	49
Derivative Liabilities		53	46
Other Contract [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	[4]	0	0
Derivative Liabilities	[4]	0	0
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		327	331
US Treasury Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		327	331
US Treasury Securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		327	331
US Treasury Securities [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
US Treasury Securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	0	0
Federal Agency Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		42	28
Federal Agency Securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Federal Agency Securities [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		42	28
Federal Agency Securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	0	0
Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		17,152	17,431
Residential Agency [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		17,152	17,431
Residential Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Residential Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		17,152	17,431
Residential Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	0	0
Residential Non-Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		2	3
Residential Non-Agency [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		2	3
Residential Non-Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Residential Non-Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Residential Non-Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	2	3
Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		3,661	3,714
Commercial Agency [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		3,661	3,714
Commercial Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Commercial Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		3,661	3,714
Commercial Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	0	0
Commercial Non-Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		766	788
Commercial Non-Agency [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		766	788
Commercial Non-Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Commercial Non-Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		766	788
Commercial Non-Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	0	0
Corporate and other debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		1,135	1,108
Corporate and other debt securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		1,135	1,108
Corporate and other debt securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		0	0
Corporate and other debt securities [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities		1,132	1,105
Corporate and other debt securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities	[4]	$ 3	$ 3
[1]	As of March 31, 2018, financial instruments posted of $49 million were not offset in the consolidated balance sheets. As of December 31, 2017, cash collateral posted of $257 million and financial instruments posted of $50 million were not offset in the consolidated balance sheets.
[2]	Marketable equity securities were reclassified from trading account securities and securities available for sale to other earning assets, beginning in the first quarter of 2018, with the adoption of new accounting guidance. Prior periods have been reclassified to conform to current period presentation.
[3]	With the adoption of new accounting guidance, effective January 1, 2018, equity investments without a readily determinable fair value are required to be adjusted prospectively to estimated fair value when an observable price transaction for a same or similar investment with the same issuer occurs.
[4]	All following disclosures related to Level 3 recurring and non-recurring assets do not include those deemed to be immaterial.

Fair Value Measurements (Rollfo

Fair Value Measurements (Rollforward For Assets And Liabilities Measured At Fair Value On A Recurring Basis With Level 3 Significant Unobservable Inputs) (Details) - Residential Mortgage Servicing Rights [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening balance		$ 336	$ 324
Gain (Loss) Included in Earnings	[1]	12	(6)
Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0
Purchases		8	8
Sales		0	0
Issuances		0	0
Settlements		0	0
Transfers Into Level 3		0	0
Transfers Out Of Level 3		0	0
Closing balance		$ 356	$ 326
[1]	Included in mortgage income.

Fair Value Measurements (Sche72

Fair Value Measurements (Schedule Of Fair Value Adjustments Related To Non-Recurring Fair Value Measurements) (Details) - Nonrecurring Fair Value Measurements [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	$ (3)	$ (4)
Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	(5)	(4)
Equity Investments Without a Readily Determinable Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	$ 7	$ 0

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) - Mortgage Servicing Rights [Member] - Discounted Cash Flow [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	[1]	Dec. 31, 2017	[2]
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Recurring	$ 356		$ 336
Recurring Fair Value Measurements [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Prepayment Rate	3.60%		7.90%
Option-Adjusted Spread	7.80%		8.10%
Recurring Fair Value Measurements [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Prepayment Rate	28.00%		28.10%
Option-Adjusted Spread	15.00%		15.00%
Recurring Fair Value Measurements [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Prepayment Rate	9.00%		9.90%
Option-Adjusted Spread	8.40%		8.60%
[1]	See Note 5 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
[2]	See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2017 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Option, Fair Value and Unpaid Principal Balance) (Details) - Mortgage loans held for sale [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 282		$ 325
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal	273		314
Aggregate Fair Value Less Aggregate Unpaid Principal	9		$ 11
Net gains (losses) resulting from changes in fair value	$ (3)	$ 4

Fair Value Measurements (Sche75

Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Financial Assets [Abstract]
Held-to-maturity Debt Securities		$ 1,585		$ 1,667
Available-for-sale Securities, Debt Securities		23,085		23,403
Loans held for sale		282		325
Other earning assets		1,640		1,891
Derivative Asset	[1]	106		253
Financial Liabilities [Abstract]
Derivative Liabilities	[1]	171		403
Fair Value Discount On Loan Portfolio Amount		$ 1,200		$ 1,100
Fair value discount on loan portfolio, rate		1.60%		1.40%
Leases, carrying amount excluded		$ 1,100		$ 1,100
Property Subject to or Available for Operating Lease, Net		450		489
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and cash equivalents		3,185		3,981
Held-to-maturity Debt Securities		1,611		1,658
Available-for-sale Securities, Debt Securities		23,085		23,403
Loans held for sale		452		348
Net loans (excluding leases)		77,917	[2],[3]	77,942	[4],[5]
Other earning assets		1,190	[6]	1,402	[7]
Derivative Asset		248		394
Financial Liabilities [Abstract]
Derivative Liabilities		396		641
Deposits		96,990		96,889
Long-term borrowings		7,949		8,132
Loan commitments and letters of credit		77		79
Estimate of Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents		3,185	[8]	3,981	[9]
Held-to-maturity Debt Securities		1,585	[8]	1,667	[9]
Available-for-sale Securities, Debt Securities		23,085	[8]	23,403	[9]
Loans held for sale		452	[8]	348	[9]
Net loans (excluding leases)		76,683	[2],[3],[8]	76,871	[4],[5],[9]
Other earning assets		1,190	[6],[8]	1,402	[7],[9]
Derivative Asset		248	[8]	394	[9]
Financial Liabilities [Abstract]
Derivative Liabilities		396	[8]	641	[9]
Deposits		97,015	[8]	96,927	[9]
Long-term borrowings		8,239	[8]	8,517	[9]
Loan commitments and letters of credit		413	[8]	540	[9]
Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents		3,185		3,981
Held-to-maturity Debt Securities		0		0
Available-for-sale Securities, Debt Securities		327		331
Loans held for sale		0		0
Net loans (excluding leases)		0	[2],[3]	0	[4],[5]
Other earning assets		525	[6]	414	[7]
Derivative Asset		2		2
Financial Liabilities [Abstract]
Derivative Liabilities		2		2
Deposits		0		0
Long-term borrowings		0		0
Loan commitments and letters of credit		0		0
Level 2 [Member]
Financial Assets [Abstract]
Cash and cash equivalents		0		0
Held-to-maturity Debt Securities		1,585		1,667
Available-for-sale Securities, Debt Securities		22,753		23,066
Loans held for sale		439		328
Net loans (excluding leases)		0	[2],[3]	0	[4],[5]
Other earning assets		665	[6]	988	[7]
Derivative Asset		233		387
Financial Liabilities [Abstract]
Derivative Liabilities		394		639
Deposits		97,015		96,927
Long-term borrowings		7,814		7,757
Loan commitments and letters of credit		0		0
Level 3 [Member]
Financial Assets [Abstract]
Cash and cash equivalents		0		0
Held-to-maturity Debt Securities		0		0
Available-for-sale Securities, Debt Securities		5		6
Loans held for sale		13		20
Net loans (excluding leases)		76,683	[2],[3]	76,871	[4],[5]
Other earning assets		0	[6]	0	[7]
Derivative Asset		13		5
Financial Liabilities [Abstract]
Derivative Liabilities		0		0
Deposits		0		0
Long-term borrowings		425		760
Loan commitments and letters of credit		$ 413		$ 540
[1]	As of March 31, 2018, financial instruments posted of $49 million were not offset in the consolidated balance sheets. As of December 31, 2017, cash collateral posted of $257 million and financial instruments posted of $50 million were not offset in the consolidated balance sheets.
[2]	Excluded from this table is the capital lease carrying amount of $1.1 billion at March 31, 2018.
[3]	The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at March 31, 2018 was $1.2 billion or 1.6 percent.
[4]	Excluded from this table is the capital lease carrying amount of $1.1 billion at December 31, 2017.
[5]	The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount on the loan portfolio's net carrying amount at December 31, 2017 was $1.1 billion or 1.4 percent.
[6]	Excluded from this table is the operating lease carrying amount of $450 million at March 31, 2018.
[7]	Excluded from this table is the operating lease carrying amount of $489 million at December 31, 2017.
[8]	Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred.
[9]	Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company maintains a corporate governance program to make adjustments for estimated changes in interest rates, market liquidity and credit spreads in the periods they are deemed to have occurred.

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0	$ 0

Business Segment Information (S

Business Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)segment	Mar. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Non-interest income	$ 507	$ 474
Non-interest expense	884	843
Income from continuing operations before income taxes	542	420
Income tax expense (benefit)	128	127
Corporate Bank [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	340	341
Provision (Credit) for Loan Losses	55	67
Non-interest income	144	123
Non-interest expense	233	214
Income from continuing operations before income taxes	196	183
Income tax expense (benefit)	49	69
Net income	147	114
Average assets	51,037	52,340
Consumer Bank [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	542	518
Provision (Credit) for Loan Losses	76	74
Non-interest income	276	275
Non-interest expense	523	513
Income from continuing operations before income taxes	219	206
Income tax expense (benefit)	55	78
Net income	164	128
Average assets	35,011	35,047
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	49	46
Provision (Credit) for Loan Losses	4	5
Non-interest income	77	74
Non-interest expense	91	84
Income from continuing operations before income taxes	31	31
Income tax expense (benefit)	8	12
Net income	23	19
Average assets	2,359	2,518
Other [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	(22)	(46)
Provision (Credit) for Loan Losses	(145)	(76)
Non-interest income	10	2
Non-interest expense	37	32
Income from continuing operations before income taxes	96	0
Income tax expense (benefit)	16	(32)
Net income	80	32
Average assets	34,917	34,747
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	909	859
Provision (Credit) for Loan Losses	(10)	70
Non-interest income	507	474
Non-interest expense	884	843
Income from continuing operations before income taxes	542	420
Income tax expense (benefit)	128	127
Net income	414	293
Average assets	123,324	124,652
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	0	0
Provision (Credit) for Loan Losses	0	0
Non-interest income	34	36
Non-interest expense	34	23
Income from continuing operations before income taxes	0	13
Income tax expense (benefit)	0	5
Net income	0	8
Average assets	170	158
Consolidated [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	909	859
Provision (Credit) for Loan Losses	(10)	70
Non-interest income	541	510
Non-interest expense	918	866
Income from continuing operations before income taxes	542	433
Income tax expense (benefit)	128	132
Net income	414	301
Average assets	$ 123,494	$ 124,810

Commitments, Contingencies an78

Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Unused commitments to extend credit	$ 46,328	$ 45,705
Standby Letters Of Credit Commitment	1,436	1,348
Commercial letters of credit	76	76
Liabilities associated with standby letters of credit	28	26
Assets associated with standby letters of credit	29	28
Reserve for unfunded credit commitments	$ 49	$ 53	$ 70	$ 69

Commitments, Contingencies an79

Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Long-term Purchase Commitment [Line Items]
Fannie Mae DUS Servicing Portfolio, Amount	$ 2,800	$ 2,900
Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee	915	923
Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee	$ 4	$ 4

Revenue Recognition (Non-Intere

Revenue Recognition (Non-Interest Income Disaggregated by Major Product Category)(Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	[1]
Corporate Bank [Member]
Disaggregation of Revenue [Line Items]
Revenue		$ 72	$ 60
Corporate Bank [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		37	36
Corporate Bank [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		12	12
Corporate Bank [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		18	9
Corporate Bank [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Corporate Bank [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		5	3
Consumer Bank [Member]
Disaggregation of Revenue [Line Items]
Revenue		236	231
Consumer Bank [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		131	127
Consumer Bank [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		96	93
Consumer Bank [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Consumer Bank [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		9	11
Wealth Management [Member]
Disaggregation of Revenue [Line Items]
Revenue		77	74
Wealth Management [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		1	1
Wealth Management [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		58	56
Wealth Management [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		17	16
Wealth Management [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Wealth Management [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		1	1
Other Segment Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue		1	2
Other Segment Revenue [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		1	2
Other Segment Revenue [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Segment Revenue [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Other Revenue - Not Impacted [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	121	107
Other Revenue - Not Impacted [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	1	2
Other Revenue - Not Impacted [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	(4)	(1)
Other Revenue - Not Impacted [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	0	0
Other Revenue - Not Impacted [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	32	23
Other Revenue - Not Impacted [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	38	41
Other Revenue - Not Impacted [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	17	19
Other Revenue - Not Impacted [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	17	18
Other Revenue - Not Impacted [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	0	0
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	(1)	5
Other Revenue - Not Impacted [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	0	0
Other Revenue - Not Impacted [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue	[2]	21	0
Continuing Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue		507	474
Continuing Operations [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		171	168
Continuing Operations [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		104	104
Continuing Operations [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		58	56
Continuing Operations [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		50	32
Continuing Operations [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		38	41
Continuing Operations [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		17	19
Continuing Operations [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		17	18
Continuing Operations [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		17	16
Continuing Operations [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		(1)	5
Continuing Operations [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Continuing Operations [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		36	15
Discontinued Operations [Member]
Disaggregation of Revenue [Line Items]
Revenue		34	36
Discontinued Operations [Member] | Service charges on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Card and ATM fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Investment management and trust fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Capital markets fee income and other [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Mortgage Income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Bank-owned life insurance [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Commercial credit fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Investment services fee income [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Market value adjustments on employee benefit assets [Member]
Disaggregation of Revenue [Line Items]
Revenue		0	0
Discontinued Operations [Member] | Insurance commissions and fees [Member]
Disaggregation of Revenue [Line Items]
Revenue		34	36
Discontinued Operations [Member] | Other miscellaneous income [Member]
Disaggregation of Revenue [Line Items]
Revenue		$ 0	$ 0
[1]	Prior period amounts have not been adjusted under the modified retrospective method.
[2]	This revenue is not impacted by the new accounting guidance and continues to be recognized when earned in accordance with the Company's existing revenue recognition policy.

Recent Accounting Pronounceme81

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-Interest Income Within Scope of New Standard	$ 420
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 600
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 400

Subsequent Event (Narrative) (D

Subsequent Event (Narrative) (Details) - Regions Insurance Group Inc. [Member] - Subsequent Event [Member] $ in Millions	Apr. 04, 2018USD ($)
Subsequent Event [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 200
Common Equity Tier One Capital	$ 300