Regions Financial (RF) 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document Entity Information [Abstract]
Entity Common Stock, Shares Outstanding		1,340,355,251
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	RF
Entity Registrant Name	REGIONS FINANCIAL CORP
Entity Central Index Key	1281761
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Assets
Cash and Due from Banks	$1,737	$1,601
Interest-bearing deposits in other banks	4,224	2,303
Federal Funds Sold and Securities Purchased under Agreements to Resell	65	100
Trading account securities	107	106
Held-to-maturity Securities	2,129	2,175
Available-for-sale Securities	22,879	22,580
Loans held for sale	491	541
Loans, net of unearned income	78,243	77,307
Allowance for loan losses	-1,098	-1,103
Net loans	77,145	76,204
Other interest-earning assets	83	89
Premises and Equipment, Net	2,174	2,193
Interest Receivable	313	310
Goodwill	4,816	4,816
Residential mortgage servicing rights at fair value	239	257
Other identifiable intangible assets	272	275
Other Assets	5,773	6,013
Total assets	122,447	119,563
Deposits:
Non-interest-bearing	33,553	31,747
Interest-bearing	63,924	62,453
Total deposits	97,477	94,200
Borrowed funds:
Federal funds purchased and securities sold under agreements to repurchase	2,085	1,753
Other Short-term Borrowings	0	500
Short-term Debt	2,085	2,253
Long-term borrowings	3,208	3,462
Total borrowed funds	5,293	5,715
Other liabilities	2,626	2,775
Total liabilities	105,396	102,690
Stockholders' equity:
Preferred stock	868	884
Common stock	14	14
Additional paid-in capital	18,604	18,767
Retained earnings (deficit)	-943	-1,177
Treasury stock, at cost	-1,377	-1,377
Accumulated other comprehensive income (loss), net	-115	-238
Total stockholders' equity	17,051	16,873
Total liabilities and stockholders' equity	$122,447	$119,563

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Securities held to maturity, estimated fair value	$2,186	$2,209
Loans held for sale, at fair value	$396	$440
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	1,383,848,685	1,395,204,638
Treasury Stock, Shares	41,262,662	41,262,645
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_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Interest income on:
Loans, including fees	$725		$732
Securities - taxable	153		154
Loans held for sale	3		8
Trading account securities	3		2
Other interest-earning assets	2		2
Total interest income	886		898
Interest expense on:
Deposits	28		27
Long-term borrowings	43		55
Total interest expense	71		82
Net interest income	815		816
Provision for loan losses	49		2
Net interest income after provision for loan losses	766		814
Non-interest income:
Service charges on deposit accounts	161		173
Card and ATM fees	85		79
Mortgage income	40		40
Securities gains (losses), net	5		2
Other	179		163
Total non-interest income	470		457
Non-interest expense:
Salaries and employee benefits	458		455
Net occupancy expense	91		93
Furniture and equipment expense	71		70
Other	285		199
Total non-interest expense	905		817
Income from continuing operations before income taxes	331		454
Income tax expense	95		151
Income from continuing operations	236		303
Discontinued operations:
Income (loss) from discontinued operations before income taxes	-4		19
Income tax expense (benefit)	-2		7
Income (loss) from discontinued operations, net of tax	-2		12
Net income	234		315
Net income from continuing operations available to common shareholders	220		295
Net income available to common shareholders	$218		$307
Weighted-average number of shares outstanding:
Basic (in shares)	1,346		1,378
Diluted (in shares)	1,358		1,390
Earnings per common share from continuing operations:
Basic (in dollars per share)	$0.16	[1]	$0.21	[1]
Diluted (in dollars per share)	$0.16	[1]	$0.21	[1]
Earnings per common share:
Basic (in dollars per share)	$0.16	[1]	$0.22	[1]
Diluted (in dollars per share)	$0.16	[1]	$0.22	[1]
Cash dividends declared, per common share (in dollars per share)	$0.05		$0.03
[1]	Certain per share amounts may not appear to reconcile due to rounding.

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$234	$315
Unrealized losses on securities transferred to held to maturity: [Abstract]
Unrealized losses on securities transferred to held to maturity, 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)	80	79
Less: reclassification adjustments for securities gains (losses) realized in net income (net of tax)	3	1
Net change in unrealized gains (losses) on securities available for sale, net of tax	77	78
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:
Unrealized holding gains (losses) on derivatives arising during the period (net of tax)	58	23
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	21	17
Net change in unrealized gains (losses) on derivative instruments, net of tax	37	6
Defined benefit pension plans and other post employment benefits:
Net actuarial gains (losses) arising during the period (net of tax)	-1	0
Less: reclassification adjustments for amortization of actuarial loss and prior service cost realized in net income (net of tax)	-8	-4
Net change from defined benefit pension plans and other post employment benefits, net of tax	7	4
Other Comprehensive Income (Loss), Net of Tax	123	90
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$357	$405

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss), Transfers from Available for Sale to Held to Maturity, Tax	$0	$0
Amortization of unrealized losses on securities transferred to held to maturity, tax	-1	-1
Unrealized holding gains on available for sale securities, tax	49	49
Reclassification adjustments for securities gains realized in net income, tax	2	1
Unrealized holding gains on derivatives, tax	35	14
Reclassification adjustments for derivative gains realized in net income, tax	12	11
Net actuarial gains and losses arising during the period, tax	0	0
Amortization of actuarial loss and prior service cost realized in net income, and other, tax	($4)	($2)

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]
In Millions, unless otherwise specified
Beginning Balance at Dec. 31, 2013	$15,660	$450	$14	$19,216	($2,324)	($1,377)	($319)
Beginning Balance Outstanding (in shares) at Dec. 31, 2013		1	1,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	315				315
Amortization of unrealized losses on securities transferred to held to maturity, net of tax	2						2
Net change in unrealized gains and losses on securities available for sale, net of tax and reclassification adjustment	78						78
Net change in unrealized gains and losses on derivative instruments, net of tax and reclassification adjustment	6						6
Net change from employee benefit plans, net of tax	4						4
Cash dividends declaredb$0.03 per share	-41			-41
Preferred stock dividends	-8	-8
Impact of share repurchase, shares			-1
Impact of share repurchase, value	-8			-8
Impact of stock transaction under compensation plans, net, shares			1
Impact of stock transaction under compensation plans, net	12			12
Ending Balance at Mar. 31, 2014	16,020	442	14	19,179	-2,009	-1,377	-229
Ending Balance Outstanding (in shares) at Mar. 31, 2014		1	1,378
Beginning Balance at Dec. 31, 2014	16,873	884	14	18,767	-1,177	-1,377	-238
Beginning Balance Outstanding (in shares) at Dec. 31, 2014		1	1,354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	234				234
Amortization of unrealized losses on securities transferred to held to maturity, net of tax	2						2
Net change in unrealized gains and losses on securities available for sale, net of tax and reclassification adjustment	77						77
Net change in unrealized gains and losses on derivative instruments, net of tax and reclassification adjustment	37						37
Net change from employee benefit plans, net of tax	7						7
Cash dividends declaredb$0.03 per share	-67			-67
Preferred stock dividends	-16	-16
Impact of share repurchase, shares	-11		-11
Impact of share repurchase, value	-102			-102
Impact of stock transaction under compensation plans, net	6			6
Ending Balance at Mar. 31, 2015	$17,051	$868	$14	$18,604	($943)	($1,377)	($115)
Ending Balance Outstanding (in shares) at Mar. 31, 2015		1	1,343

CONSOLIDATED_STATEMENTS_OF_CHA1

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividend declared (in dollars per share)	$0.05	$0.03

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$234	$315
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	49	2
Depreciation, amortization and accretion, net	123	122
Securities (gains) losses, net	-5	-2
Deferred income tax expense	38	115
Originations and purchases of loans held for sale	-565	-511
Proceeds from sales of loans held for sale	634	640
Gain on TDRs held for sale, net	0	-35
(Gain) loss on sale of loans, net	-23	-7
(Gain) loss on early extinguishment of debt	43	0
Net change in operating assets and liabilities:
Trading account securities	-1	-6
Other interest-earning assets	6	0
Interest receivable and other assets	-112	-249
Other liabilities	-121	36
Other	-6	1
Net cash from operating activities	294	421
Investing activities:
Proceeds from maturities of securities held to maturity	46	36
Proceeds from sales of securities available for sale	516	185
Proceeds from maturities of securities available for sale	863	711
Purchases of securities available for sale	-1,232	-846
Proceeds from sales of loans	37	580
Purchases of loans	-256	-246
Net change in loans	-827	-963
Net purchases of premises and equipment and other assets	-51	-37
Net cash from investing activities	-904	-580
Financing activities:
Net change in deposits	3,277	940
Net change in short-term borrowings	-168	-201
Payments on long-term borrowings	-293	-602
Cash dividends on common stock	-67	-41
Cash dividends on preferred stock	-16	-8
Repurchase of common stock	-102	-8
Other	1	2
Net cash from financing activities	2,632	82
Net change in cash and cash equivalents	2,022	-77
Cash and cash equivalents at beginning of year	4,004	5,273
Cash and cash equivalents at end of period	$6,026	$5,196

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
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 primarily in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kentucky, Louisiana, Mississippi, Missouri, North Carolina, South Carolina, Tennessee, Texas and Virginia. The Company is subject to competition from other financial institutions, is subject to the regulations of certain government agencies and undergoes periodic examinations by certain of those 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 accounting principles generally accepted in the United States (“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’ Form 10-K for the year ended December 31, 2014. Regions has evaluated all subsequent events for potential recognition and disclosure through the filing date of this Form 10-Q.
	On January 11, 2012, Regions entered into an agreement to sell Morgan Keegan & Company, Inc. (“Morgan Keegan”) and related affiliates. The transaction closed on April 2, 2012. See Note 2 and Note 14 for further details. Results of operations for the 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, 2014.
	Effective January 1, 2015, the Company adopted new guidance related to the accounting for investments in qualified affordable housing projects. For investments that have met the criteria specified in the guidance, Regions has elected to use the proportional amortization method. Under this method, the initial investment is amortized in proportion to the actual tax credits and other tax benefits to be received in the current period as compared to the total tax credits and other tax benefits expected to be received over the life of the investment. The amortization and tax benefits will be included as a component of income tax expense. The guidance required retrospective application. All prior period amounts impacted by this guidance have been revised. The cumulative effect of the retrospective application was a $116 million decrease to retained earnings (deficit), a $22 million increase to other interest-earning assets and a $138 million decrease to other assets. The Company's total investments in qualified affordable housing projects were $861 million and $818 million at March 31, 2015 and December 31, 2014, respectively. These investments are reflected in other assets on Regions' consolidated balance sheets. The Company recognized $25 million and $22 million of amortization expense and $29 million and $26 million of tax credits related to these investments during the first quarter of 2015 and 2014, respectively. The Company also recognized $6 million of other tax benefits related to these investments for both the first quarter of 2015 and 2014.
	Certain other prior period amounts have been reclassified to conform to the current period presentation. These reclassifications are immaterial and have no effect on net income, comprehensive income, total assets or total stockholders’ equity as previously reported.

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS
	On January 11, 2012, Regions entered into a stock purchase agreement to sell Morgan Keegan and related affiliates to Raymond James Financial, Inc. (“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 14 for related disclosure.
	The following table represents the condensed results of operations for discontinued operations:
		Three Months Ended March 31
		2015			2014
		(In millions, except per share data)
	Non-interest expense:
	Professional and legal expenses	$	4		$	(19	)
	Total non-interest expense	4			(19		)
	Income (loss) from discontinued operations before income taxes	(4		)	19
	Income tax expense (benefit)	(2		)	7
	Income (loss) from discontinued operations, net of tax	$	(2	)	$	12
	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, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES
	The amortized cost, gross unrealized gains and losses, and estimated fair value of securities held to maturity and securities available for sale are as follows:
		31-Mar-15
				Recognized in OCI (1)									Not recognized in OCI
		Amortized		Gross Unrealized Gains			Gross Unrealized Losses			Carrying Value			Gross		Gross			Estimated
		Cost											Unrealized		Unrealized			Fair
													Gains		Losses			Value
		(In millions)
	Securities held to maturity:
	U.S. Treasury securities	$	1	$	—		$	—		$	1		$	—	$	—		$	1
	Federal agency securities	350		—			(12		)	338			10		—			348
	Mortgage-backed securities:
	Residential agency	1,655		—			(69		)	1,586			49		—			1,635
	Commercial agency	210		—			(6		)	204			—		(2		)	202
		$	2,216	$	—		$	(87	)	$	2,129		$	59	$	(2	)	$	2,186
	Securities available for sale:
	U.S. Treasury securities	$	178	$	2		$	—		$	180							$	180
	Federal agency securities	230		4			—			234								234
	Obligations of states and political subdivisions	2		—			—			2								2
	Mortgage-backed securities:
	Residential agency	15,838		329			(14		)	16,153								16,153
	Residential non-agency	7		—			—			7								7
	Commercial agency	1,964		29			(3		)	1,990								1,990
	Commercial non-agency	1,535		23			(2		)	1,556								1,556
	Corporate and other debt securities	2,047		50			(23		)	2,074								2,074
	Equity securities	670		13			—			683								683
		$	22,471	$	450		$	(42	)	$	22,879							$	22,879
		December 31, 2014
				Recognized in OCI (1)									Not recognized in OCI
		Amortized		Gross Unrealized Gains			Gross Unrealized Losses			Carrying Value			Gross		Gross			Estimated
		Cost											Unrealized		Unrealized			Fair
													Gains		Losses			Value
		(In millions)
	Securities held to maturity:
	U.S. Treasury securities	$	1	$	—		$	—		$	1		$	—	$	—		$	1
	Federal agency securities	350		—			(12		)	338			6		—			344
	Mortgage-backed securities:
	Residential agency	1,698		—			(71		)	1,627			35		(1		)	1,661
	Commercial agency	216		—			(7		)	209			—		(6		)	203
		$	2,265	$	—		$	(90	)	$	2,175		$	41	$	(7	)	$	2,209
	Securities available for sale:
	U.S. Treasury securities	$	176	$	—		$	—		$	176							$	176
	Federal agency securities	233		2			—			235								235
	Obligations of states and political subdivisions	2		—			—			2								2
	Mortgage-backed securities:
	Residential agency	15,788		283			(33		)	16,038								16,038
	Residential non-agency	7		1			—			8								8
	Commercial agency	1,959		14			(9		)	1,964								1,964
	Commercial non-agency	1,489		14			(9		)	1,494								1,494
	Corporate and other debt securities	1,980		36			(26		)	1,990								1,990
	Equity securities	662		12			(1		)	673								673
		$	22,296	$	362		$	(78	)	$	22,580							$	22,580
	_________
	(1) The gross unrealized losses recognized in other comprehensive income (OCI) on held to maturity securities resulted from a transfer of available for sale securities to held to maturity in the second quarter of 2013.
	During the second quarter of 2013, Regions transferred securities with a fair value of $2.4 billion from available for sale to held to maturity. Management determined it has both the positive intent and ability to hold these securities to maturity. The securities were reclassified at fair value at the time of transfer and represented a non-cash transaction. Accumulated other comprehensive income included net pre-tax unrealized losses of $111 million on the securities at the date of transfer. These unrealized losses and the offsetting OCI components are being amortized into net interest income over the remaining life of the related securities as a yield adjustment, resulting in no impact on future net income.
	Equity securities in the tables above included the following amortized cost related to Federal Reserve Bank stock and Federal Home Loan Bank (“FHLB”) stock. Shares in the Federal Reserve Bank and FHLB are accounted for at amortized cost, which approximates fair value.
		March 31, 2015		December 31, 2014
		(In millions)
	Federal Reserve Bank	$	488	$	488
	Federal Home Loan Bank	16		39
	Securities with carrying values of $13.1 billion and $12.1 billion at March 31, 2015 and December 31, 2014, respectively, were pledged to secure public funds, trust deposits and certain borrowing arrangements. Of the $13.1 billion securities pledged at March 31, 2015, approximately $28 million represents encumbered U.S. Treasury securities.
	The amortized cost and estimated fair value of securities available for sale and securities held to maturity at March 31, 2015, 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		Estimated
		Cost		Fair Value
	(In millions)
Securities held to maturity:
Due in one year or less	$	—	$	—
Due after one year through five years	1		1
Due after five years through ten years	350		348
Mortgage-backed securities:
Residential agency	1,655		1,635
Commercial agency	210		202
	$	2,216	$	2,186
Securities available for sale:
Due in one year or less	$	105	$	105
Due after one year through five years	975		998
Due after five years through ten years	1,042		1,051
Due after ten years	335		336
Mortgage-backed securities:
Residential agency	15,838		16,153
Residential non-agency	7		7
Commercial agency	1,964		1,990
Commercial non-agency	1,535		1,556
Equity securities	670		683
	$	22,471	$	22,879
The following tables present gross unrealized losses and the related estimated fair value of securities available for sale and held to maturity at March 31, 2015 and December 31, 2014. For 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.
	31-Mar-15
	Less Than Twelve Months					Twelve Months or More						Total
	Estimated		Gross			Estimated			Gross			Estimated		Gross
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
	(In millions)
Securities held to maturity:
Federal agency securities	$	149	$	(1	)	$	199		$	(1	)	$	348	$	(2	)
Mortgage-backed securities:
Residential agency	289		(1		)	1,267			(19		)	1,556		(20		)
Commercial agency	—		—			202			(8		)	202		(8		)
	$	438	$	(2	)	$	1,668		$	(28	)	$	2,106	$	(30	)
Securities available for sale:
U.S. Treasury securities	$	11	$	—		$	—		$	—		$	11	$	—
Federal agency securities	—		—			6			—			6		—
Mortgage-backed securities:
Residential agency	1,318		(5		)	978			(9		)	2,296		(14		)
Commercial agency	415		(2		)	247			(1		)	662		(3		)
Commercial non-agency	62		(1		)	240			(1		)	302		(2		)
All other securities	323		(8		)	267			(15		)	590		(23		)
	$	2,129	$	(16	)	$	1,738		$	(26	)	$	3,867	$	(42	)
	31-Dec-14
	Less Than Twelve Months					Twelve Months or More						Total
	Estimated		Gross			Estimated			Gross			Estimated		Gross
	Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	Value		Losses			Value			Losses			Value		Losses
	(In millions)
Securities held to maturity:
Federal agency securities	$	—	$	—		$	344		$	(6	)	$	344	$	(6	)
Mortgage-backed securities:
Residential agency	—		—			1,659			(37		)	1,659		(37		)
Commercial agency	—		—			203			(13		)	203		(13		)
	$	—	$	—		$	2,206		$	(56	)	$	2,206	$	(56	)
Securities available for sale:
U.S. Treasury securities	$	74	$	—		$	3		$	—		$	77	$	—
Federal agency securities	—		—			3			—			3		—
Mortgage-backed securities:
Residential agency	1,178		(5		)	2,587			(28		)	3,765		(33		)
Commercial agency	464		(4		)	316			(5		)	780		(9		)
Commercial non-agency	242		(1		)	500			(8		)	742		(9		)
All other securities	400		(7		)	455			(20		)	855		(27		)
	$	2,358	$	(17	)	$	3,864		$	(61	)	$	6,222	$	(78	)
The number of individual securities in an unrealized loss position in the tables above decreased from 827 at December 31, 2014 to 511 at March 31, 2015. The decrease in the number of securities and the total amount of unrealized losses from year-end 2014 was primarily due to changes in interest rates. In instances where an unrealized loss did occur, there was no indication of an adverse change in credit on any of the underlying securities in the tables above. Management believes no individual unrealized loss represented an other-than-temporary impairment 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 securities before the recovery of their amortized cost basis, which may be at maturity.
Gross realized gains and gross realized losses on sales of 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
	2015		2014
	(In millions)
Gross realized gains	$	5	$	3
Gross realized losses	—		(1		)
Securities gains, net	$	5	$	2

Loans_and_the_Allowance_for_Cr

Loans and the Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2015
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, 2015				December 31, 2014
		(In millions, net of unearned income)
	Commercial and industrial	$	33,681			$	32,732
	Commercial real estate mortgage—owner-occupied	8,043				8,263
	Commercial real estate construction—owner-occupied	437				407
	Total commercial	42,161				41,402
	Commercial investor real estate mortgage	4,499				4,680
	Commercial investor real estate construction	2,422				2,133
	Total investor real estate	6,921				6,813
	Residential first mortgage	12,418				12,315
	Home equity	10,854				10,932
	Indirect	3,701				3,642
	Consumer credit card	966				1,009
	Other consumer	1,222				1,194
	Total consumer	29,161				29,092
		$	78,243			$	77,307
	During the three months ended March 31, 2015 and 2014, Regions purchased approximately $256 million and $246 million, respectively, in indirect loans from a third party.
	At March 31, 2015, $13.3 billion in loans held by Regions were pledged to secure borrowings from the FHLB. At March 31, 2015, an additional $30.0 billion of loans held by Regions were pledged to the Federal Reserve Bank.
	ALLOWANCE FOR CREDIT LOSSES
	Regions determines the appropriate level of the allowance on at least 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, 2014, 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, 2015 and 2014. The total allowance for loan losses and the related loan portfolio ending balances as of March 31, 2015 and 2014 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 loans and leases greater than or equal to $2.5 million and all troubled debt restructurings ("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, 2015
		Commercial				Investor Real				Consumer			Total
						Estate
		(In millions)
	Allowance for loan losses, January 1, 2015	$	654			$	150			$	299		$	1,103
	Provision (credit) for loan losses	59				(25		)		15			49
	Loan losses:
	Charge-offs	(34		)		(8		)		(59		)	(101		)
	Recoveries	17				8				22			47
	Net loan losses	(17		)		—				(37		)	(54		)
	Allowance for loan losses, March 31, 2015	696				125				277			1,098
	Reserve for unfunded credit commitments, January 1, 2015	57				8				—			65
	Provision (credit) for unfunded credit losses	1				—				—			1
	Reserve for unfunded credit commitments, March 31, 2015	58				8				—			66
	Allowance for credit losses, March 31, 2015	$	754			$	133			$	277		$	1,164
	Portion of ending allowance for loan losses:
	Individually evaluated for impairment	$	178			$	49			$	73		$	300
	Collectively evaluated for impairment	518				76				204			798
	Total allowance for loan losses	$	696			$	125			$	277		$	1,098
	Portion of loan portfolio ending balance:
	Individually evaluated for impairment	$	766			$	320			$	857		$	1,943
	Collectively evaluated for impairment	41,395				6,601				28,304			76,300
	Total loans evaluated for impairment	$	42,161			$	6,921			$	29,161		$	78,243
		Three Months Ended March 31, 2014
		Commercial				Investor Real				Consumer			Total
						Estate
		(In millions)
	Allowance for loan losses, January 1, 2014	$	711			$	236			$	394		$	1,341
	Provision (credit) for loan losses	5				(27		)		24			2
	Loan losses:
	Charge-offs	(41		)		(9		)		(74		)	(124		)
	Recoveries	17				8				17			42
	Net loan losses	(24		)		(1		)		(57		)	(82		)
	Allowance for loan losses, March 31, 2014	692				208				361			1,261
	Reserve for unfunded credit commitments, January 1, 2014	63				12				3			78
	Provision (credit) for unfunded credit losses	—				(1		)		1			—
	Reserve for unfunded credit commitments, March 31, 2014	63				11				4			78
	Allowance for credit losses, March 31, 2014	$	755			$	219			$	365		$	1,339
	Portion of ending allowance for loan losses:
Individually evaluated for impairment	$	223			$	98			$	90		$	411
Collectively evaluated for impairment	469				110				271			850
Total allowance for loan losses	$	692			$	208			$	361		$	1,261
Portion of loan portfolio ending balance:
Individually evaluated for impairment	$	1,006			$	676			$	869		$	2,551
Collectively evaluated for impairment	39,092				6,316				27,721			73,129
Total loans evaluated for impairment	$	40,098			$	6,992			$	28,590		$	75,680
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.
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 valuation of real estate.
Consumer—The consumer loan portfolio segment includes residential first mortgage, home equity, indirect, 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 lending, which is lending initiated through third-party business partners, largely consists of loans made through automotive dealerships. 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, 2015 and December 31, 2014. 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 which 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 which 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.
	31-Mar-15
	Pass				Special  Mention				Substandard			Non-accrual			Total
									Accrual
	(In millions)
Commercial and industrial	$	32,185			$	600			$	598		$	298		$	33,681
Commercial real estate mortgage—owner-occupied	7,207				311				309			216			8,043
Commercial real estate construction—owner-occupied	405				15				14			3			437
Total commercial	$	39,797			$	926			$	921		$	517		$	42,161
Commercial investor real estate mortgage	$	4,096			$	150			$	168		$	85		$	4,499
Commercial investor real estate construction	2,365				21				36			—			2,422
Total investor real estate	$	6,461			$	171			$	204		$	85		$	6,921
									Accrual			Non-accrual			Total
									(In millions)
Residential first mortgage									$	12,317		$	101		$	12,418
Home equity									10,757			97			10,854
Indirect									3,701			—			3,701
Consumer credit card									966			—			966
Other consumer									1,222			—			1,222
Total consumer									$	28,963		$	198		$	29,161
															$	78,243
	December 31, 2014
	Pass				Special				Substandard			Non-accrual			Total
					Mention				Accrual
	(In millions)
Commercial and industrial	$	31,492			$	626			$	362		$	252		$	32,732
Commercial real estate mortgage—owner-occupied	7,425				315				285			238			8,263
Commercial real estate construction—owner-occupied	387				9				8			3			407
Total commercial	$	39,304			$	950			$	655		$	493		$	41,402
Commercial investor real estate mortgage	$	4,152			$	234			$	171		$	123		$	4,680
Commercial investor real estate construction	2,060				22				49			2			2,133
Total investor real estate	$	6,212			$	256			$	220		$	125		$	6,813
									Accrual			Non-accrual			Total
									(In millions)
Residential first mortgage									$	12,206		$	109		$	12,315
Home equity									10,830			102			10,932
Indirect									3,642			—			3,642
Consumer credit card									1,009			—			1,009
Other consumer									1,194			—			1,194
Total consumer									$	28,881		$	211		$	29,092
															$	77,307
AGING ANALYSIS
The following tables include an aging analysis of days past due (DPD) for each portfolio segment and class as of March 31, 2015 and December 31, 2014:
	31-Mar-15
	Accrual Loans
	30-59 DPD				60-89 DPD				90+ DPD			Total			Total		Non-accrual		Total
												30+ DPD			Accrual
	(In millions)
Commercial and industrial	$	17			$	10			$	4		$	31		$	33,383	$	298	$	33,681
Commercial real estate	24				6				7			37			7,827		216		8,043
mortgage—owner-occupied
Commercial real estate construction—owner-occupied	—				—				—			—			434		3		437
Total commercial	41				16				11			68			41,644		517		42,161
Commercial investor real estate mortgage	7				2				2			11			4,414		85		4,499
Commercial investor real estate construction	4				—				—			4			2,422		—		2,422
Total investor real estate	11				2				2			15			6,836		85		6,921
Residential first mortgage	84				43				225			352			12,317		101		12,418
Home equity	64				37				67			168			10,757		97		10,854
Indirect	34				7				6			47			3,701		—		3,701
Consumer credit card	6				5				12			23			966		—		966
Other consumer	9				3				4			16			1,222		—		1,222
Total consumer	197				95				314			606			28,963		198		29,161
	$	249			$	113			$	327		$	689		$	77,443	$	800	$	78,243
	December 31, 2014
	Accrual Loans
	30-59 DPD				60-89 DPD				90+ DPD			Total			Total		Non-accrual		Total
												30+ DPD			Accrual
	(In millions)
Commercial and industrial	$	16			$	7			$	7		$	30		$	32,480	$	252	$	32,732
Commercial real estate	21				13				5			39			8,025		238		8,263
mortgage—owner-occupied
Commercial real estate construction—owner-occupied	1				—				—			1			404		3		407
Total commercial	38				20				12			70			40,909		493		41,402
Commercial investor real estate mortgage	17				3				3			23			4,557		123		4,680
Commercial investor real estate construction	—				—				—			—			2,131		2		2,133
Total investor real estate	17				3				3			23			6,688		125		6,813
Residential first mortgage	99				64				247			410			12,206		109		12,315
Home equity	73				38				63			174			10,830		102		10,932
Indirect	43				10				7			60			3,642		—		3,642
Consumer credit card	8				5				12			25			1,009		—		1,009
Other consumer	13				4				3			20			1,194		—		1,194
Total consumer	236				121				332			689			28,881		211		29,092
	$	291			$	144			$	347		$	782		$	76,478	$	829	$	77,307
IMPAIRED LOANS
The following tables present details related to the Company’s impaired loans as of March 31, 2015 and December 31, 2014. Loans deemed to be impaired include all TDRs and all non-accrual commercial and investor real estate loans, excluding leases. Loans which have been fully charged-off do not appear in the tables below.
	Non-accrual Impaired Loans As of March 31, 2015
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans on			Loans on		Allowance
	Balance(1)				Applied(2)				Loans on			Non-accrual			Non-accrual		for Loan
									Non-accrual			Status with			Status with		Losses
									Status			No Related			Related
												Allowance			Allowance
	(Dollars in millions)
Commercial and industrial	$	333			$	36			$	297		$	39		$	258	$	77	33.9	%
Commercial real estate mortgage—owner-occupied	239				23				216			39			177		63		36
Commercial real estate construction—owner-occupied	3				—				3			—			3		2		66.7
Total commercial	575				59				516			78			438		142		35
Commercial investor real estate mortgage	122				37				85			18			67		19		45.9
Commercial investor real estate construction	1				1				—			—			—		—		100
Total investor real estate	123				38				85			18			67		19		46.3
Residential first mortgage	73				24				49			—			49		6		41.1
Home equity	21				7				14			—			14		1		38.1
Total consumer	94				31				63			—			63		7		40.4
	$	792			$	128			$	664		$	96		$	568	$	168	37.4	%
	Accruing Impaired Loans As of March 31, 2015
	Unpaid				Charge-offs				Book Value(3)			Related			Coverage %(4)
	Principal				and Payments							Allowance for
	Balance(1)				Applied(2)							Loan Losses
	(Dollars in millions)
Commercial and industrial	$	104			$	1			$	103		$	19		19.2	%
Commercial real estate mortgage—owner-occupied	157				10				147			17			17.2
Commercial real estate construction—owner-occupied	1				1				—			—			100
Total commercial	262				12				250			36			18.3
Commercial investor real estate mortgage	211				8				203			24			15.2
Commercial investor real estate construction	32				—				32			6			18.8
Total investor real estate	243				8				235			30			15.6
Residential first mortgage	439				10				429			56			15
Home equity	353				6				347			10			4.5
Indirect	1				—				1			—			—
Consumer credit card	2				—				2			—			—
Other consumer	15				—				15			—			—
Total consumer	810				16				794			66			10.1
	$	1,315			$	36			$	1,279		$	132		12.8	%
	Total Impaired Loans As of March 31, 2015
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans with No			Loans with		Allowance
	Balance(1)				Applied(2)				Loans			Related			Related		for Loan
												Allowance			Allowance		Losses
	(Dollars in millions)
Commercial and industrial	$	437			$	37			$	400		$	39		$	361	$	96	30.4	%
Commercial real estate mortgage—owner-occupied	396				33				363			39			324		80		28.5
Commercial real estate construction—owner-occupied	4				1				3			—			3		2		75
Total commercial	837				71				766			78			688		178		29.7
Commercial investor real estate mortgage	333				45				288			18			270		43		26.4
Commercial investor real estate construction	33				1				32			—			32		6		21.2
Total investor real estate	366				46				320			18			302		49		26
Residential first mortgage	512				34				478			—			478		62		18.8
Home equity	374				13				361			—			361		11		6.4
Indirect	1				—				1			—			1		—		—
Consumer credit card	2				—				2			—			2		—		—
Other consumer	15				—				15			—			15		—		—
Total consumer	904				47				857			—			857		73		13.3
	$	2,107			$	164			$	1,943		$	96		$	1,847	$	300	22	%
_________
-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.
	Non-accrual Impaired Loans As of December 31, 2014
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans on			Loans on		Allowance
	Balance(1)				Applied(2)				Loans on			Non-accrual			Non-accrual		for Loan
									Non-accrual			Status with			Status with		Losses
									Status			No Related			Related
												Allowance			Allowance
	(Dollars in millions)
Commercial and industrial	$	286			$	36			$	250		$	11		$	239	$	83	41.6	%
Commercial real estate mortgage—owner-occupied	267				29				238			43			195		69		36.7
Commercial real estate construction—owner-occupied	3				—				3			—			3		1		33.3
Total commercial	556				65				491			54			437		153		39.2
Commercial investor real estate mortgage	162				39				123			26			97		30		42.6
Commercial investor real estate construction	3				1				2			—			2		1		66.7
Total investor real estate	165				40				125			26			99		31		43
Residential first mortgage	79				26				53			—			53		7		41.8
Home equity	22				7				15			—			15		1		36.4
Total consumer	101				33				68			—			68		8		40.6
	$	822			$	138			$	684		$	80		$	604	$	192	40.1	%
	Accruing Impaired Loans As of December 31, 2014
	Unpaid				Charge-offs				Book Value(3)			Related			Coverage %(4)
	Principal				and Payments							Allowance for
	Balance(1)				Applied(2)							Loan Losses
	(Dollars in millions)
Commercial and industrial	$	102			$	3			$	99		$	17		19.6	%
Commercial real estate mortgage—owner-occupied	162				10				152			16			16
Total commercial	264				13				251			33			17.4
Commercial investor real estate mortgage	267				8				259			28			13.5
Commercial investor real estate construction	33				—				33			6			18.2
Total investor real estate	300				8				292			34			14
Residential first mortgage	426				11				415			57			16
Home equity	359				6				353			13			5.3
Indirect	1				—				1			—			—
Consumer credit card	2				—				2			—			—
Other consumer	17				—				17			—			—
Total consumer	805				17				788			70			10.8
	$	1,369			$	38			$	1,331		$	137		12.8	%
	Total Impaired Loans As of December 31, 2014
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans with No			Loans with		Allowance for
	Balance(1)				Applied(2)				Loans			Related			Related		Loan Losses
												Allowance			Allowance
	(Dollars in millions)
Commercial and industrial	$	388			$	39			$	349		$	11		$	338	$	100	35.8	%
Commercial real estate mortgage—owner-occupied	429				39				390			43			347		85		28.9
Commercial real estate construction—owner-occupied	3				—				3			—			3		1		33.3
Total commercial	820				78				742			54			688		186		32.2
Commercial investor real estate mortgage	429				47				382			26			356		58		24.5
Commercial investor real estate construction	36				1				35			—			35		7		22.2
Total investor real estate	465				48				417			26			391		65		24.3
Residential first mortgage	505				37				468			—			468		64		20
Home equity	381				13				368			—			368		14		7.1
Indirect	1				—				1			—			1		—		—
Consumer credit card	2				—				2			—			2		—		—
Other consumer	17				—				17			—			17		—		—
Total consumer	906				50				856			—			856		78		14.1
	$	2,191			$	176			$	2,015		$	80		$	1,935	$	329	23	%
________
-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, 2015 and 2014. Interest income recognized represents interest on accruing loans modified in a TDR. TDRs are considered impaired loans.
	Three Months Ended March 31
	2015								2014
	Average				Interest				Average			Interest
	Balance				Income				Balance			Income
					Recognized							Recognized
	(In millions)
Commercial and industrial	$	359			$	1			$	467		$	3
Commercial real estate mortgage—owner-occupied	379				3				511			4
Commercial real estate construction—owner-occupied	3				—				41			—
Total commercial	741				4				1,019			7
Commercial investor real estate mortgage	331				3				620			8
Commercial investor real estate construction	33				1				87			1
Total investor real estate	364				4				707			9
Residential first mortgage	476				4				457			4
Home equity	363				5				387			5
Indirect	1				—				1			—
Consumer credit card	2				—				2			—
Other consumer	15				—				24			—
Total consumer	857				9				871			9
Total impaired loans	$	1,962			$	17			$	2,597		$	25
In addition to the impaired loans detailed in the tables above, there were approximately $32 million in non-performing loans classified as held for sale at March 31, 2015, compared to $38 million at December 31, 2014. The loans are carried at an amount approximating a price which is expected to be recoverable through the loan sale market. During the three months ended March 31, 2015 and 2014, approximately $12 million and $15 million, respectively, in non-performing loans were transferred to held for sale; these amounts are net of charge-offs of $7 million and $8 million, respectively, recorded upon transfer. At March 31, 2015 and December 31, 2014, non-accrual loans including loans held for sale totaled $832 million and $867 million, respectively.
TROUBLED DEBT RESTRUCTURINGS
Regions regularly modifies commercial and investor real estate loans in order to facilitate a workout strategy. Typical modifications include accommodations, such as renewals and forbearances. The majority of Regions’ commercial and investor real estate TDRs are the result of renewals of classified loans at an interest rate that is not considered to be a market interest rate. For smaller dollar commercial loans, Regions may periodically grant interest rate and other term concessions, similar to those under the consumer program described below.
Regions works to meet the individual needs of consumer borrowers to stem foreclosure through the Customer Assistance Program ("CAP"). Regions designed the program to allow for customer-tailored modifications with the goal of keeping customers in their homes and avoiding foreclosure where possible. Modification may be offered to any borrower experiencing financial hardship regardless of the borrower’s payment status. Consumer TDRs primarily involve an interest rate concession, however under the CAP, Regions may also offer a short-term deferral, a term extension, a new loan product, or a combination of these options. For loans restructured under the CAP, Regions expects to collect the original contractually due principal. The gross original contractual interest may be collectible, depending on the terms modified. The length of the CAP modifications ranges from temporary payment deferrals of three months to term extensions for the life of the loan. All such modifications are considered TDRs regardless of the term because they are concessionary in nature and because the customer documents a hardship in order to participate.
As noted above, the majority of Regions’ TDRs are the result of interest rate concession and not a forgiveness of principal. Accordingly, the financial impact of the modifications is best illustrated by the impact to the allowance calculation at the loan or pool level, as a result of the loans being considered impaired due to their TDR status. Regions most often does not record a charge-off at the modification date.
None of the modified consumer loans listed in the following TDR disclosures were collateral-dependent at the time of modification. At March 31, 2015, approximately $58 million in residential first mortgage TDRs were in excess of 180 days past due and were considered collateral-dependent. At March 31, 2015, approximately $8 million in home equity first lien TDRs were in excess of 180 days past due and approximately $5 million in home equity second lien TDRs were in excess of 120 days past due, both of which were considered collateral-dependent.
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 in the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2014.
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. The end of period balance, for the period in which it was added, of total loans first reported as new TDRs totaled approximately $107 million and $121 million for the three months ended March 31, 2015 and 2014, respectively.
	Three Months Ended March 31, 2015
								Financial Impact
								of Modifications
								Considered TDRs
	Number of			Recorded				Increase in
	Obligors			Investment				Allowance at
								Modification
	(Dollars in millions)
Commercial and industrial	41			$	57			$	1
Commercial real estate mortgage—owner-occupied	42			25				1
Total commercial	83			82				2
Commercial investor real estate mortgage	29			24				1
Commercial investor real estate construction	1			1				—
Total investor real estate	30			25				1
Residential first mortgage	133			32				4
Home equity	125			6				—
Consumer credit card	32			—				—
Indirect and other consumer	87			1				—
Total consumer	377			39				4
	490			$	146			$	7
	Three Months Ended March 31, 2014
								Financial Impact
								of Modifications
								Considered TDRs
	Number of			Recorded				Increase in
	Obligors			Investment				Allowance at
								Modification
	(Dollars in millions)
Commercial and industrial	91			$	94			$	—
Commercial real estate mortgage—owner-occupied	85			70				1
Commercial real estate construction—owner-occupied	1			1				—
Total commercial	177			165				1
Commercial investor real estate mortgage	98			107				—
Commercial investor real estate construction	15			7				—
Total investor real estate	113			114				—
Residential first mortgage	125			24				4
Home equity	154			10				—
Consumer credit card	32			—				—
Indirect and other consumer	51			1				—
Total consumer	362			35				4
	652			$	314			$	5
Defaulted TDRs
The following table presents by portfolio segment and class TDRs that defaulted during the three months ended March 31, 2015 and 2014, and that were modified in the previous twelve months (i.e., the twelve months prior to the default). For purposes of this disclosure, default is defined as 90 days past due and still accruing for the consumer portfolio segment, and placement on non-accrual status for the commercial and investor real estate portfolio segments. Consideration of defaults in the calculation of the allowance for loan losses is described in detail in the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2014.
	Three Months Ended March 31
	2015				2014
	(In millions)
Defaulted During the Period, Where Modified in a TDR Twelve Months Prior to Default
Commercial and industrial	$	1			$	42
Commercial real estate mortgage—owner-occupied	1				3
Total commercial	2				45
Commercial investor real estate mortgage	1				2
Commercial investor real estate construction	—				1
Total investor real estate	1				3
Residential first mortgage	3				9
Home equity	—				1
Total consumer	3				10
	$	6			$	58
Commercial and investor real estate loans that were on non-accrual status at the time of the latest modification are not included in the default table above, as they are already considered to be in default at the time of the restructuring. At March 31, 2015, approximately $28 million of commercial and investor real estate loans modified in a TDR during the three months ended March 31, 2015 were on non-accrual status. Approximately 1.4 percent of this amount was 90 days past due.
At March 31, 2015, Regions had restructured binding unfunded commitments totaling $99 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, 2015
Transfers and Servicing of Financial Assets [Abstract]
Servicing of Financial Assets	SERVICING OF FINANCIAL ASSETS
	RESIDENTIAL MORTGAGE BANKING ACTIVITIES
	The fair value of residential mortgage servicing rights 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 mortgage servicing rights. 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 mortgage servicing rights under the fair value measurement method:
		Three Months Ended March 31
		2015			2014
		(In millions)
	Carrying value, beginning of period	$	257		$	297
	Additions	7			8
	Increase (decrease) in fair value(1):
	Due to change in valuation inputs or assumptions	(17		)	(10		)
	Economic amortization associated with borrower repayments	(8		)	(7		)
	Carrying value, end of period	$	239		$	288
	________
	(1) "Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. Prior to the fourth quarter of 2014, this line item reflected total loan payoffs only, while partial paydowns were included in the "Due to change in valuation inputs or assumptions" line item. The 2014 three months ended amount disclosed in the table has been reclassified to reflect the revised presentation.
	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 (excluding related derivative instruments) are as follows:
		31-Mar
		2015			2014
		(Dollars in millions)
	Unpaid principal balance	$	26,903		$	27,785
	Weighted-average prepayment speed (CPR; percentage)	12.7		%	9.3		%
	Estimated impact on fair value of a 10% increase	$	(14	)	$	(12	)
	Estimated impact on fair value of a 20% increase	$	(27	)	$	(23	)
	Option-adjusted spread (basis points)	1,006			880
	Estimated impact on fair value of a 10% increase	$	(9	)	$	(9	)
	Estimated impact on fair value of a 20% increase	$	(18	)	$	(18	)
	Weighted-average coupon interest rate	4.4		%	4.5		%
	Weighted-average remaining maturity (months)	279			279
	Weighted-average servicing fee (basis points)	27.8			27.7
	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 the residential mortgage servicing rights 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
		2015			2014
		(In millions)
	Servicing related fees and other ancillary income	$	20		$	21
	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 a 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. The table below presents an analysis of Regions’ repurchase liability related to residential mortgage loans sold with representations and warranty provisions:
		Three Months Ended March 31
		2015			2014
		(In millions)
	Beginning balance	$	26		$	39
	Additions (reductions), net	1			3
	Losses	(1		)	(3		)
	Ending balance	$	26		$	39
	COMMERCIAL MORTGAGE BANKING ACTIVITIES
	On July 18, 2014, Regions was approved as a Fannie Mae Delegated Underwriting and Servicing ("DUS") lender and acquired a DUS servicing portfolio totaling approximately $1.0 billion. The Fannie Mae DUS program provides liquidity to the multi-family housing market. As part of the transaction, Regions recorded $12 million in commercial mortgage servicing rights accounted for under the amortization method and $15 million in intangible assets associated with the DUS license purchased. Regions also assumed a one-third loss share guarantee associated with the purchased portfolio and any future originations. Regions estimated the fair value of the loss share guarantee to be approximately $4 million. See Note 1 "Summary of Significant Accounting Policies" in the 2014 Annual Report on Form 10-K for additional information.
	As of March 31, 2015, the DUS servicing portfolio remained at approximately $1.0 billion, the related commercial mortgage servicing rights were valued at approximately $11 million, and the loss share guarantee was valued at approximately $3 million.

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL
	Goodwill allocated to each reportable segment (each a reporting unit) is presented as follows:
		31-Mar-15		December 31, 2014
		(In millions)
	Corporate Bank	$	2,258	$	2,258
	Consumer Bank	2,095		2,095
	Wealth Management	463		463
		$	4,816	$	4,816
	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 in the Annual Report on Form 10-K for the year ended December 31, 2014. 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 2015, Regions assessed events and circumstances for all three reporting units as of March 31, 2015 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.
	Results of the 2014 annual test indicated that the estimated fair value of each reporting unit exceeded its carrying amount as of the test date. Additionally, 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 values as of March 31, 2015. Therefore, Regions determined that a test of goodwill impairment was not required for each of Regions’ reporting units for the March 31, 2015 interim period.

Stockholders_Equity_and_Accumu

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
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:
										31-Mar-15			December 31, 2014
		Issuance Date		Earliest Redemption Date	Dividend Rate			Liquidation Amount		Carrying Amount			Carrying Amount
		(Dollars in millions)
	Series A	11/1/12		12/15/17	6.375	%		$	500	$	411		$	419
	Series B	4/29/14		9/15/24	6.375	%	(1)	500		457			465
								$	1,000	$	868		$	884
	_________
	(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 Series A Preferred Stock during the first quarters of 2015 and 2014. Series B Preferred Stock dividends were $8 million for the first quarter of 2015. Because the Company was in a retained deficit position, preferred dividends were recorded as a reduction of preferred stock, including related surplus.
	COMMON STOCK
	During the first quarter of 2015, Regions received no objection from the Federal Reserve to its 2015 capital plan that was submitted as part of the Comprehensive Capital Analysis and Review ("CCAR") process. On April 23, 2015, Regions' Board of Directors approved an increase of its quarterly common stock dividend to $0.06 per share effective with the quarterly dividend to be paid in July 2015. The Board also authorized a new $875 million common stock repurchase plan, permitting repurchases from the beginning of the second quarter of 2015 through the end of the second quarter of 2016. The Company began purchasing shares in April 2015, and as of May 5, 2015, Regions had repurchased approximately 7 million shares of common stock at a total cost of approximately $68 million. These shares were immediately retired upon repurchase and therefore will not be included in treasury stock.
	On April 24, 2014, Regions' Board of Directors authorized a $350 million common stock repurchase plan, permitting repurchases from the beginning of the second quarter of 2014 through the end of the first quarter of 2015. During the first quarter of 2015, Regions concluded the plan with the repurchase of approximately 11 million shares of common stock at a total cost of approximately $102 million. All common shares repurchased under this plan were immediately retired and therefore are not included in treasury stock.
	The Board of Directors declared a $0.05 per share cash dividend on common stock for the first quarter of 2015, and a $0.03 per share cash dividend for the first quarter of 2014.
	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Activity within the balances in accumulated other comprehensive income (loss) is shown in the following tables:
		Three Months Ended March 31, 2015
		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
													income (loss), net of tax
		(In millions)
	Beginning of period	$	(55	)	$	175		$	33	$	(391	)	$	(238	)
	Net change	2			77			37		7			123
	End of period	$	(53	)	$	252		$	70	$	(384	)	$	(115	)
		Three Months Ended March 31, 2014
		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
													income (loss), net of tax
		(In millions)
	Beginning of period	$	(64	)	$	(22	)	$	15	$	(248	)	$	(319	)
	Net change	2			78			6		4			90
	End of period	$	(62	)	$	56		$	21	$	(244	)	$	(229	)
	The following tables present amounts reclassified out of accumulated other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	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
		1			1			Tax (expense) or benefit
		$	(2	)	$	(2	)	Net of tax
	Unrealized gains and (losses) on available-for-sale securities:
		$	5		$	2		Securities gains, net
		(2		)	(1		)	Tax (expense) or benefit
		$	3		$	1		Net of tax
	Gains and (losses) on cash flow hedges:
	Interest rate contracts	$	33		$	28		Net interest income
		(12		)	(11		)	Tax (expense) or benefit
		$	21		$	17		Net of tax
	Amortization of defined benefit pension plans and other post employment benefits:
	Prior-service cost	$	—		$	—		(2)
	Actuarial gains (losses)	(12		)	(6		)	(2)
		(12		)	(6		)	Total before tax
		4			2			Tax (expense) or benefit
		$	(8	)	$	(4	)	Net of tax
	Total reclassifications for the period	$	14		$	12		Net of tax
	________
	(1) Amounts in parentheses indicate reductions to net income.
	(2) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost and are included in salaries and employee benefits on the consolidated statements of income (see Note 10 for additional details).

Earnings_Per_Common_Share_Comp

Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Common Share)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per 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
		2015			2014
		(In millions, except per share amounts)
	Numerator:
	Income from continuing operations	$	236		$	303
	Preferred stock dividends	(16		)	(8		)
	Income from continuing operations available to common shareholders	220			295
	Income (loss) from discontinued operations, net of tax	(2		)	12
	Net income available to common shareholders	$	218		$	307
	Denominator:
	Weighted-average common shares outstanding—basic	1,346			1,378
	Potential common shares	12			12
	Weighted-average common shares outstanding—diluted	1,358			1,390
	Earnings per common share from continuing operations available to common shareholders(1):
	Basic	$	0.16		$	0.21
	Diluted	0.16			0.21
	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	0.16			0.22
	Diluted	0.16			0.22
	________
	-1	Certain per share amounts may not appear to reconcile due to rounding.
	For earnings (loss) per common share from discontinued operations, basic and diluted weighted-average common shares outstanding are the same for the three months ended March 31, 2015 due to a net loss.
	The effect from the assumed exercise of 28 million and 25 million stock options for the three months ended March 31, 2015 and 2014, 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.

ShareBased_Payments

Share-Based Payments	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Payments	SHARE-BASED PAYMENTS
	Regions administers long-term incentive compensation plans that permit the granting of incentive awards in the form of stock options, restricted stock awards, performance awards and stock appreciation rights. While Regions has the ability to issue stock appreciation rights, none have been issued to date. The terms of all awards issued under these plans are determined by the Compensation Committee of the Board of Directors; however, no awards may be granted after the tenth anniversary from the date the plans were initially approved by shareholders. Incentive awards usually vest based on employee service, generally within three years from the date of the grant. The contractual lives of options granted under these plans are typically ten years from the date of the grant.
	On May 13, 2010, the shareholders of the Company approved the Regions Financial Corporation 2010 Long-Term Incentive Plan (“2010 LTIP”), which permits the Company to grant to employees and directors various forms of incentive compensation. These forms of incentive compensation are similar to the types of compensation approved in prior plans. The 2010 LTIP authorizes 100 million common share equivalents available for grant, where grants of options count as one share equivalent and grants of full value awards (e.g., shares of restricted stock, restricted stock units and performance stock units) count as 2.25 share equivalents. Unless otherwise determined by the Compensation Committee of the Board of Directors, grants of restricted stock, restricted stock units, and performance stock units accrue dividends, or their notional equivalent, as they are declared by the Board of Directors, and are paid upon vesting of the award. Upon adoption of the 2010 LTIP, Regions closed all prior long-term incentive plans to new grants, and, accordingly, prospective grants must be made under the 2010 LTIP or a successor plan. All existing grants under prior long-term incentive plans were unaffected by adoption of the 2010 LTIP. The number of remaining share equivalents available for future issuance under the 2010 LTIP was approximately 41 million at March 31, 2015.
	On April 23, 2015, the shareholders of the Company approved the Regions Financial Corporation 2015 Long Term Incentive Plan ("2015 LTIP"), which permits the Company to grant to employees and directors various forms of incentive compensation. These forms of incentive compensation are similar to the types of compensation approved in prior plans. The 2015 LTIP authorizes 60 million common share equivalents available for grant, where grants of options and grants of full value awards (e.g., shares of restricted stock, restricted stock units and performance stock units) count as one share equivalent. Unless otherwise determined by the Compensation Committee of the Board of Directors, grants of restricted stock, restricted stock units, and performance stock units accrue dividends, or their notional equivalent, as they are declared by the Board of Directors, and are paid upon vesting of the award. Upon adoption of the 2015 LTIP, Regions closed the prior long-term incentive plan to new grants, and, accordingly, prospective grants must be made under the 2015 LTIP or a successor plan. All existing grants under prior long-term incentive plans are unaffected by adoption of the 2015 LTIP.
	STOCK OPTIONS
	The following table summarizes the activity related to stock options:
		Three Months Ended March 31
		2015				2014
		Number of		Weighted-Average		Number of		Weighted-Average
		Options		Exercise Price		Options		Exercise Price
	Outstanding at beginning of period	25,316,676		$	23.07	32,127,235		$	22.81
	Granted	—		—		—		—
	Exercised	(42,056	)	7		(1,330,599	)	4.29
	Canceled/Forfeited	(4,867,902	)	33.77		(4,070,485	)	30.53
	Outstanding at end of period	20,406,718		$	20.98	26,726,151		$	22.55
	Exercisable at end of period	20,406,718		$	20.98	26,293,952		$	22.82
	RESTRICTED STOCK AWARDS AND PERFORMANCE STOCK AWARDS
	Regions periodically grants restricted stock awards that vest upon service conditions. Regions also periodically grants restricted stock awards and performance stock awards that vest based upon service conditions and performance conditions. Incremental shares earned above the performance target associated with previous performance stock awards are included when and if performance targets are achieved. Dividend payments during the vesting period are deferred to the end of the vesting term. The fair value of these restricted shares, restricted stock units and performance stock units was estimated based upon the fair value of the underlying shares on the date of the grant. The valuation was not adjusted for the deferral of dividends.
	The following table summarizes the activity related to restricted stock awards and performance stock awards:
		Three Months Ended March 31
		2015				2014
		Number of		Weighted-Average		Number of		Weighted-Average
		Shares		Grant Date Fair Value		Shares		Grant Date Fair Value
	Non-vested at beginning of period	18,427,409		$	8.07	16,212,198		$	6.83
	Granted	454,147		5.88		21,233		9.89
	Vested	(591,101	)	6.15		(494,932	)	7.28
	Forfeited	(152,044	)	8.06		(59,149	)	7
	Non-vested at end of period	18,138,411		$	8.13	15,679,350		$	6.82

Pension_and_Other_Postretireme

Pension and Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Pension and Other Postretirement Benefits	PENSION AND OTHER POSTRETIREMENT BENEFITS
	Regions has a defined benefit pension plan qualified under the Internal Revenue Code covering only certain employees as the pension plan is closed to new entrants. The Company also sponsors a supplemental executive retirement program (the "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, which is recorded in salaries and employee benefits on the consolidated statements of income, included the following components:
		Qualified Plan						Non-qualified Plans				Total
		Three Months Ended March 31
		2015			2014			2015		2014		2015			2014
		(In millions)
	Service cost	$	10		$	8		$	1	$	1	$	11		$	9
	Interest cost	21			22			1		1		22			23
	Expected return on plan assets	(36		)	(34		)	—		—		(36		)	(34		)
	Amortization of actuarial loss	11			5			1		1		12			6
	Amortization of prior service cost	—			—			—		—		—			—
	Net periodic pension cost	$	6		$	1		$	3	$	3	$	9		$	4
	Regions' policy for funding the qualified pension plan is to contribute annually at least the amount required by Internal Revenue Service minimum funding standards. Regions made a contribution of $150 million for the 2014 plan year during the first three months of 2015.
	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, 2015 or 2014.

Derivative_Financial_Instrumen

Derivative Financial Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2015
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, 2015 and December 31, 2014.
		31-Mar-15										December 31, 2014
		Notional			Estimated Fair Value							Notional				Estimated Fair Value
		Amount			Gain(1)			Loss(1)				Amount				Gain(1)		Loss(1)
		(In millions)
	Derivatives in fair value hedging relationships:
	Interest rate swaps	$	2,410		$	13		$	47			$	2,817			$	6	$	30
	Derivatives in cash flow hedging relationships:
	Interest rate swaps	8,950			84			6				8,050				38		31
	Total derivatives designated as hedging instruments	$	11,360		$	97		$	53			$	10,867			$	44	$	61
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	45,892		$	948		$	971			$	45,860			$	941	$	972
	Interest rate options	2,824			15			1				3,016				10		2
	Interest rate futures and forward commitments	16,010			8			8				17,978				3		8
	Other contracts	4,203			213			206				4,149				217		211
	Total derivatives not designated as hedging instruments	$	68,929		$	1,184		$	1,186			$	71,003			$	1,171	$	1,193
	Total derivatives	$	80,289		$	1,281		$	1,239			$	81,870			$	1,215	$	1,254
	_________
	-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.
	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, 2014 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 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 issues long-term fixed-rate debt for various funding needs. Regions may enter into receive LIBOR/pay fixed forward starting swaps to hedge risks of changes in the projected quarterly interest payments attributable to changes in the benchmark interest rate ("LIBOR") during the time leading up to the probable issuance date of the new long-term fixed-rate debt.
	Regions recognized an unrealized after-tax gain of $25 million and $56 million in accumulated other comprehensive income (loss) at March 31, 2015 and 2014, respectively, related to terminated cash flow hedges of loan and debt instruments, which will be amortized into earnings in conjunction with the recognition of interest payments through 2017. Regions recognized pre-tax income of $11 million during both of the three months ended March 31, 2015 and 2014 related to the amortization of cash flow hedges of loan and debt instruments.
	Regions expects to reclassify out of accumulated other comprehensive income (loss) and into earnings approximately $111 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 $35 million in pre-tax net gains 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 six years as of March 31, 2015.
	The following tables present the effect of hedging derivative instruments on the consolidated statements of income:
		Gain or (Loss) Recognized in Income on Derivatives						Location of Amounts Recognized in Income on Derivatives and Related Hedged Item		Gain or (Loss) Recognized in Income on Related Hedged Item
		Three Months Ended March 31								Three Months Ended March 31
		2015			2014					2015				2014
		(In millions)								(In millions)
	Fair Value Hedges:
	Interest rate swaps on:
	Debt/CDs	$	4		$	9		Interest expense		$	4			$	2
	Debt/CDs	7			(8		)	Other non-interest expense		(7		)		9
	Securities available for sale	(4		)	(4		)	Interest income		—				—
	Securities available for sale	(20		)	(18		)	Other non-interest expense		19				14
	Total	$	(13	)	$	(21	)			$	16			$	25
		Effective Portion(3)
		Gain or (Loss) Recognized in AOCI(1)						Location of Amounts Reclassified from AOCI into Income		Gain or (Loss) Reclassified from AOCI into Income(2)
		Three Months Ended March 31								Three Months Ended March 31
		2015			2014					2015				2014
		(In millions)								(In millions)
	Cash Flow Hedges:
	Interest rate swaps	$	37		$	4		Interest income on loans		$	33			$	31
	Forward starting swaps	—			2			Interest expense on debt		—				(3		)
	Total	$	37		$	6				$	33			$	28
	______
	(1) After-tax
	(2) Pre-tax
	(3) All cash flow hedges were highly effective for all periods presented, and the change in fair value attributed to hedge ineffectiveness was not material.
	DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS
	The Company maintains a derivatives portfolio of interest rate swaps, option contracts, and futures and forward commitments used to meet the needs of its customers. The portfolio is primarily used to help clients manage market risk. The Company is subject to the credit risk that a counterparty will fail to perform. The Company is also subject to market risk, which is evaluated by the Company and monitored by the asset/liability management process. Separate derivative contracts are entered into to reduce overall market exposure to pre-defined limits. The contracts in this portfolio do not qualify for hedge accounting and are marked-to-market through earnings and included in other assets and other liabilities.
	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, 2015 and December 31, 2014, Regions had $363 million and $233 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, which are recorded at fair value with changes in fair value recorded in mortgage income. At March 31, 2015 and December 31, 2014, Regions had $678 million and $621 million, respectively, in total notional amount related to these forward sale commitments.
	Regions has elected to account for residential mortgage servicing rights at fair market 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 consolidated statement of income effect of changes in the fair value of its residential mortgage servicing rights. As of March 31, 2015 and December 31, 2014, the total notional amount related to these contracts was $3.5 billion and $3.7 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, 2015 and 2014:
		Three Months Ended March 31
	Derivatives Not Designated as Hedging Instruments	2015			2014
		(In millions)
Capital markets fee income and other(1):
Interest rate swaps	$	4		$	2
Interest rate options	—			—
Interest rate futures and forward commitments	(1		)	—
Other contracts	4			2
Total capital markets fee income and other	7			4
Mortgage income:
Interest rate swaps	13			8
Interest rate options	7			3
Interest rate futures and forward commitments	4			(4		)
Total mortgage income	24			7
	$	31		$	11
______
(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, 2015 and December 31, 2014, totaled approximately $486 million and $392 million, respectively. This amount represents 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. Credit derivatives, whereby Regions has purchased credit protection, entitle Regions to receive a payment from the counterparty when the customer fails to make payment on any amounts due to Regions upon early termination of the swap transaction and have maturities between 2015 and 2020. Credit derivatives whereby Regions has sold credit protection have maturities between 2016 and 2021. For contracts where Regions sold credit protection, Regions would be required to make payment to the counterparty when 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, 2015 was approximately $65 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, 2015 and 2014 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.
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 value of all derivative instruments with any credit-risk-related contingent features that were in a liability position on March 31, 2015 and December 31, 2014, was $262 million and $272 million, respectively, for which Regions had posted collateral of $262 million and $272 million, respectively, in the normal course of business.
OFFSETTING
Regions engages in derivatives transactions with dealers and customers. These derivatives transactions are subject to enforceable master netting agreements, which include a right of setoff by the non-defaulting or non-affected party upon early termination of the derivatives transaction. The following table presents the Company's gross derivative positions, including collateral posted or received, as of March 31, 2015 and December 31, 2014.
	Offsetting Derivative Assets						Offsetting Derivative Liabilities
	31-Mar-15			December 31, 2014			31-Mar-15				December 31, 2014
	(In millions)
Gross amounts subject to offsetting	$	1,180		$	1,157		$	1,143			$	1,195
Gross amounts not subject to offsetting	101			58			96				59
Gross amounts recognized	1,281			1,215			1,239				1,254
Gross amounts offset in the consolidated balance sheets(1)	787			815			1,000				1,054
Net amounts presented in the consolidated balance sheets	494			400			239				200
Gross amounts not offset in the consolidated balance sheets:
Financial instruments	8			8			28				—
Cash collateral received/posted	—			—			23				29
Net amounts	$	486		$	392		$	188			$	171
________
-1	At March 31, 2015, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $118 million and cash collateral posted of $330 million. At December 31, 2014, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $111 million and cash collateral posted of $354 million.
Gross amounts of derivatives not subject to offsetting primarily consist of derivatives cleared through a Central Counterparty Clearing House ("CCP") and interest rate lock commitments to originate mortgage loans. During 2014, Regions obtained legal opinions which support that trades cleared through the Chicago Mercantile Exchange are governed under a master netting agreement and, consequently, trades cleared through this CCP receive balance sheet netting treatment. Legal opinions have not been obtained for trades cleared through the London Clearing House, Ltd,. and, therefore, trades cleared through this CCP are not offset on Regions' consolidated balance sheets.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
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, 2014 for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis. Regions rarely transfers assets and liabilities measured at fair value between Level 1 and Level 2 measurements. There were no such transfers during the three month periods ended March 31, 2015 and 2014. Trading account securities and securities available for sale may be periodically transferred to or from Level 3 valuation based on management’s conclusion regarding the best method of pricing for an individual security. 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, 2015 and December 31, 2014:
		31-Mar-15													December 31, 2014
		Level 1			Level 2				Level 3			Total			Level 1				Level 2		Level 3			Total
												Estimated Fair Value												Estimated Fair Value
		(In millions)
	Recurring fair value measurements
	Trading account securities	$	107		$	—			$	—		$	107		$	106			$	—	$	—		$	106
	Securities available for sale:
	U.S. Treasury securities	$	180		$	—			$	—		$	180		$	176			$	—	$	—		$	176
	Federal agency securities	—			234				—			234			—				235		—			235
	Obligations of states and political subdivisions	—			2				—			2			—				2		—			2
	Mortgage-backed securities (MBS):
	Residential agency	—			16,153				—			16,153			—				16,038		—			16,038
	Residential non-agency	—			—				7			7			—				—		8			8
	Commercial agency	—			1,990				—			1,990			—				1,964		—			1,964
	Commercial non-agency	—			1,556				—			1,556			—				1,494		—			1,494
	Corporate and other debt securities	—			2,071				3			2,074			—				1,987		3			1,990
	Equity securities(1)	179			—				—			179			146				—		—			146
	Total securities available for sale	$	359		$	22,006			$	10		$	22,375		$	322			$	21,720	$	11		$	22,053
	Mortgage loans held for sale	$	—		$	396			$	—		$	396		$	—			$	440	$	—		$	440
	Residential mortgage servicing rights	$	—		$	—			$	239		$	239		$	—			$	—	$	257		$	257
	Derivative assets:
	Interest rate swaps	$	—		$	1,045			$	—		$	1,045		$	—			$	985	$	—		$	985
	Interest rate options	—			1				14			15			—				2		8			10
	Interest rate futures and forward commitments	—			8				—			8			—				3		—			3
	Other contracts	—			213				—			213			—				217		—			217
	Total derivative assets	$	—		$	1,267			$	14		$	1,281		$	—			$	1,207	$	8		$	1,215
	Derivative liabilities:
	Interest rate swaps	$	—		$	1,024			$	—		$	1,024		$	—			$	1,033	$	—		$	1,033
	Interest rate options	—			1				—			1			—				2		—			2
	Interest rate futures and forward commitments	—			8				—			8			—				8		—			8
	Other contracts	—			206				—			206			—				211		—			211
	Total derivative liabilities	$	—		$	1,239			$	—		$	1,239		$	—			$	1,254	$	—		$	1,254
	Nonrecurring fair value measurements
	Loans held for sale	$	—		$	—			$	14		$	14		$	—			$	—	$	33		$	33
	Foreclosed property and other real estate	—			35				33			68			—				41		8			49
	_______
	(1) Excludes Federal Reserve Bank and Federal Home Loan Bank Stock totaling $488 million and $16 million at March 31, 2015 and $488 million and $39 million at December 31, 2014, respectively.
	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 the Asset and Liability Management Committee of the Company in a holistic approach to managing price fluctuation risks.
	The following tables illustrate a rollforward for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2015 and 2014. The tables do not reflect the change in fair value attributable to any related economic hedges the Company used to mitigate the interest rate risk associated with these assets and liabilities. The net changes in realized gains (losses) included in earnings related to Level 3 assets and liabilities held at March 31, 2015 and 2014 are not material.
		Three Months Ended March 31, 2015
		Opening			Total Realized /						Purchases		Sales	Issuances			Settlements			Transfers	Transfers		Closing
		Balance January 1,			Unrealized															into	out of		Balance March 31, 2015
		2015			Gains or Losses															Level 3	Level 3
					Included			Included
					in			in Other
					Earnings			Compre-
								hensive
								Income
								(Loss)
		(In millions)
	Level 3 Instruments Only
	Securities available for sale:
	Residential non-agency MBS	$	8		—			—			—		—	—			(1	)		—	—		$	7
	Corporate and other debt securities	3			—			—			—		—	—			—			—	—		3
	Total securities available for sale	$	11		—			—			—		—	—			(1	)		—	—		$	10
	Residential mortgage servicing rights	$	257		(25	)	(1)	—			7		—	—			—			—	—		$	239
	Total interest rate options derivatives, net	$	8		28		(1)	—			—		—	—			(22	)		—	—		$	14
		Three Months Ended March 31, 2014
		Opening			Total Realized /						Purchases		Sales	Issuances			Settlements			Transfers	Transfers		Closing
		Balance			Unrealized															into	out of		Balance
		January 1,			Gains or Losses															Level 3	Level 3		March 31,
	2014			Included			Included															2014
				in Earnings			in Other
							Compre-
							hensive
							Income
							(Loss)
	(In millions)
Level 3 Instruments Only
Securities available for sale:
Residential non-agency MBS	$	9		—			—			—		—	—			—			—	—		$	9
Corporate and other debt securities	2			—			—			3		—	—			(2	)		—	—		3
Total securities available for sale	$	11		—			—			3		—	—			(2	)		—	—		$	12
Residential mortgage servicing rights	$	297		(17	)	(1)	—			8		—	—			—			—	—		$	288
Total interest rate options derivatives, net	$	5		21		(1)	—			—		—	—			(18	)		—	—		$	8
_________
(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
	2015			2014
	(In millions)
Loans held for sale	$	(7	)	$	(15	)
Foreclosed property and other real estate	(7		)	(7		)
The following tables present detailed information regarding assets and liabilities measured at fair value using significant unobservable inputs (Level 3) as of March 31, 2015 and December 31, 2014. 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, 2015 and December 31, 2014 are included. Following the tables are a description of the valuation technique and the sensitivity of the technique to changes in the significant unobservable input.
	31-Mar-15
	Level 3		Valuation	Unobservable		Quantitative Range of
	Estimated Fair Value at		Technique	Input(s)		Unobservable Inputs and
	31-Mar-15					(Weighted-Average)
	(Dollars in millions)
Recurring fair value measurements:
Securities available for sale:
Residential non-agency MBS	$7		Discounted cash flow	Spread to LIBOR		5.3% - 49.8% (14.6%)
				Weighted-average prepayment speed (CPR; percentage)		5.5% - 14.2% (9.4%)
				Probability of default		1.40%
				Loss severity		40.20%
Corporate and other debt securities	$3		Market comparable	Evaluated quote on same issuer/comparable bond		99.90%
Residential mortgage servicing rights(1)	$239		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		11.9% - 14.0% (12.7%)
				Option-adjusted spread (percentage)		8.7% - 17.4% (10.1%)
Derivative assets:
Interest rate options	$14		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		11.9% - 14.0% (12.7%)
				Option-adjusted spread (percentage)		8.7% - 17.4% (10.1%)
				Pull-through		20.3% - 99.1% (86.9%)
Nonrecurring fair value measurements:
Loans held for sale	$14		Commercial loans held for sale are valued based on multiple data points, including discount to appraised value of collateral based on recent market activity for sales of similar loans	Appraisal comparability adjustment (discount)		27.3% - 99.9% (63.7%)
Foreclosed property and other real estate	$33		Discount to appraised value of property based on recent market activity for sales of similar properties	Appraisal comparability adjustment (discount)		25.0% - 61.7% (28.2%)
_________
(1) See Note 5 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
	December 31, 2014
	Level 3		Valuation	Unobservable		Quantitative Range of
	Estimated Fair Value at		Technique	Input(s)		Unobservable Inputs and
	December 31, 2014					(Weighted-Average)
	(Dollars in millions)
Recurring fair value measurements:
Securities available for sale:
Residential non-agency MBS	$8		Discounted cash flow	Spread to LIBOR		5.4% - 49.9% (12.3%)
				Weighted-average prepayment speed (CPR; percentage)		6.3% - 15.0% (9.5%)
				Probability of default		1.40%
				Loss severity		37.40%
Corporate and other debt securities	$3		Market comparable	Evaluated quote on same issuer/comparable bond		99.90%
Residential mortgage servicing rights(1)	$257		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		9.9% - 22.4% (12.0%)
				Option-adjusted spread (percentage)		7.7% - 11.3% (9.0%)
Derivative assets:
Interest rate options	$8		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		9.9% - 22.4% (12.0%)
				Option-adjusted spread (percentage)		7.7% - 11.3% (9.0%)
				Pull-through		7.3% - 99.1% (87.8%)
Nonrecurring fair value measurements:
Loans held for sale	$33		Commercial loans held for sale are valued based on multiple data points, including discount to appraised value of collateral based on recent market activity for sales of similar loans	Appraisal comparability adjustment (discount)		8.3% - 90.9% (53.3%)
Foreclosed property and other real estate	$8		Discount to appraised value of property based on recent market activity for sales of similar properties	Appraisal comparability adjustment (discount)		3.7% - 73.0% (29.6%)
_________
(1) See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2014 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
Securities available for sale
Mortgage-backed securities: residential non-agency—The fair value reported in this category relates to retained interests in legacy securitizations. Significant unobservable inputs include the spread to LIBOR, constant prepayment rate, probability of default, and loss severity in the event of default. Significant increases in any of these inputs in isolation would result in significantly lower fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumption used for loss severity and a directionally opposite change in the assumption used for prepayment rates.
Corporate and other debt securities—Significant unobservable inputs include evaluated quotes on comparable bonds for the same issuer and management-determined comparability adjustments. Changes in the evaluated quote on comparable bonds would result in a directionally similar change in the fair value of the other debt securities.
Residential mortgage servicing rights
The significant unobservable inputs used in the fair value measurement of residential mortgage servicing rights ("MSR") are option adjusted spreads (“OAS”) and prepayment speed. This method 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 such as 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.
Derivative assets
Interest rate options—These instruments are interest rate lock agreements made in the normal course of originating residential mortgage loans. Significant unobservable inputs in the fair value measurement are OAS, prepayment speeds, and pull-through. The impact of OAS and prepayment speed inputs in the valuation of these derivative instruments are consistent with the MSR discussion above. Pull-through is an estimate of the number of interest rate lock commitments that will ultimately become funded loans. Increases or decreases in the pull-through assumption will have a corresponding impact on the value of these derivative assets.
NON-RECURRING FAIR VALUE MEASUREMENTS USING SIGNIFICANT UNOBSERVABLE INPUTS
Loans held for sale
Commercial loans held for sale are valued based on multiple data points indicating the fair value for each loan. The primary data point for loans held for sale is a discount to the appraised value of the underlying collateral, which considers the return required by potential buyers of the loans. Management establishes this discount or comparability adjustment based on recent sales of loans secured by similar property types. As liquidity in the market increases or decreases, the comparability adjustment and the resulting asset valuation are impacted.
Foreclosed property and other real estate
Foreclosed property and other real estate are valued based on offered quotes as available. If no sales contract is pending for a specific property, management establishes a comparability adjustment to the appraised value based on historical activity considering proceeds for properties sold versus the corresponding appraised value. Increases or decreases in realization for properties sold impact the comparability adjustment for similar assets remaining on the balance sheet.
FAIR VALUE OPTION
Regions has elected the fair value option for all FNMA and FHLMC eligible residential 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 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:
	31-Mar-15										December 31, 2014
	Aggregate			Aggregate				Aggregate Fair			Aggregate		Aggregate				Aggregate Fair
	Fair Value			Unpaid				Value Less			Fair Value		Unpaid				Value Less
				Principal				Aggregate					Principal				Aggregate
								Unpaid									Unpaid
								Principal									Principal
	(In millions)
Mortgage loans held for sale, at fair value	$	396		$	381			$	15		$	440	$	421			$	19
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 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, 2015 and 2014, respectively. 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.
	Mortgage loans held for sale, at fair value
	Three Months Ended March 31
	2015			2014
	(In millions)
Net gains (losses) resulting from changes in fair value	$	(4	)	$	6
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, 2015 are as follows:
	31-Mar-15
	Carrying			Estimated				Level 1			Level 2		Level 3
	Amount			Fair
				Value(1)
	(In millions)
Financial assets:
Cash and cash equivalents	$	6,026		$	6,026			$	6,026		$	—	$	—
Trading account securities	107			107				107			—		—
Securities held to maturity	2,129			2,186				1			2,185		—
Securities available for sale	22,879			22,879				359			22,510		10
Loans held for sale	491			491				—			396		95
Loans (excluding leases), net of unearned income and allowance for loan losses(2)(3)	75,324			71,683				—			—		71,683
Other interest-earning assets	83			83				—			83		—
Derivative assets	1,281			1,281				—			1,267		14
Financial liabilities:
Derivative liabilities	1,239			1,239				—			1,239		—
Deposits	97,477			97,469				—			97,469		—
Short-term borrowings	2,085			2,085				—			2,085		—
Long-term borrowings	3,208			3,860				—			2,869		991
Loan commitments and letters of credit	104			544				—			—		544
Indemnification obligation	204			188				—			—		188
_________
-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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.
-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 at March 31, 2015 was $3.6 billion or 4.8 percent.
-3	Excluded from this table is the lease carrying amount of $1.8 billion at March 31, 2015.
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, 2014 are as follows:
	December 31, 2014
	Carrying			Estimated				Level 1			Level 2		Level 3
	Amount			Fair
				Value(1)
	(In millions)
Financial assets:
Cash and cash equivalents	$	4,004		$	4,004			$	4,004		$	—	$	—
Trading account securities	106			106				106			—		—
Securities held to maturity	2,175			2,209				1			2,208		—
Securities available for sale	22,580			22,580				322			22,247		11
Loans held for sale	541			541				—			440		101
Loans (excluding leases), net of unearned income and allowance for loan losses(2)(3)	74,482			70,114				—			—		70,114
Other interest-earning assets	89			89				—			89		—
Derivative assets	1,215			1,215				—			1,207		8
Financial liabilities:
Derivative liabilities	1,254			1,254				—			1,254		—
Deposits	94,200			94,186				—			94,186		—
Short-term borrowings	2,253			2,253				—			2,253		—
Long-term borrowings	3,462			3,871				—			3,504		367
Loan commitments and letters of credit	106			539				—			—		539
Indemnification obligation	206			198				—			—		198
_________
-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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.
-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 at December 31, 2014 was $4.4 billion or 5.9 percent.
-3	Excluded from this table is the lease carrying amount of $1.7 billion at December 31, 2014.

Business_Segment_Information

Business Segment Information	3 Months Ended
	Mar. 31, 2015
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. During the fourth quarter of 2014, Regions reorganized its internal management structure and, accordingly, its segment reporting structure. Previously, Regions’ three operating segments were Business Services, Consumer Services, and Wealth Management. Under the organizational realignment, Regions has created a Consumer Bank, which consists principally of the previous Consumer Services segment with businesses that serve retail and small business banking customers, and a Corporate Bank, which consists principally of the previous Business Services segment with businesses that serve middle-market and large commercial clients. Previously, small business banking was located within Business Services, but now resides in the Consumer Bank as its product set is more consistent with those offered in that segment. The Wealth Management segment remained unchanged during the reorganization. Segment results for all periods presented have been recast to reflect this organizational realignment.
	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.
	The following tables present financial information for each reportable segment for the period indicated.
		Three Months Ended March 31, 2015
		Corporate Bank		Consumer		Wealth		Other			Continuing		Discontinued			Consolidated
				Bank		Management					Operations		Operations
		(In millions)
	Net interest income (loss)	$	280	$	601	$	42	$	(108	)	$	815	$	—		$	815
	Provision (credit) for loan losses	—		53		2		(6		)	49		—			49
	Non-interest income	90		265		99		16			470		—			470
	Non-interest expense	153		589		105		58			905		4			909
	Income (loss) before income taxes	217		224		34		(144		)	331		(4		)	327
	Income tax expense (benefit)	82		85		13		(85		)	95		(2		)	93
	Net income (loss)	$	135	$	139	$	21	$	(59	)	$	236	$	(2	)	$	234
	Average assets	$	45,150	$	37,993	$	2,912	$	34,511		$	120,566	$	—		$	120,566
		Three Months Ended March 31, 2014
		Corporate Bank		Consumer Bank		Wealth		Other			Continuing		Discontinued			Consolidated
						Management					Operations		Operations
		(In millions)
	Net interest income (loss)	$	283	$	611	$	43	$	(121	)	$	816	$	—		$	816
	Provision (credit) for loan losses	—		81		1		(80		)	2		—			2
	Non-interest income	75		275		92		15			457		—			457
	Non-interest expense	136		563		100		18			817		(19		)	798
	Income (loss) before income taxes	222		242		34		(44		)	454		19			473
	Income tax expense (benefit)	84		92		13		(38		)	151		7			158
	Net income (loss)	$	138	$	150	$	21	$	(6	)	$	303	$	12		$	315
	Average assets	$	42,515	$	38,728	$	2,959	$	33,515		$	117,717	$	—		$	117,717

Commitments_Contingencies_and_

Commitments, Contingencies and Guarantees	3 Months Ended
	Mar. 31, 2015
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, 2015		31-Dec-14
		(In millions)
	Unused commitments to extend credit	$	44,642	$	43,724
	Standby letters of credit	1,629		1,697
	Commercial letters of credit	41		71
	Liabilities associated with standby letters of credit	38		40
	Assets associated with standby letters of credit	38		40
	Reserve for unfunded credit commitments	66		65
	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, its affiliates and subsidiaries, and current and former officers, directors and employees, are sometimes collectively referred to as Regions and certain Related Persons. 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, as previously discussed, 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. The indemnification obligation had a carrying amount of approximately $204 million and an estimated fair value of approximately $188 million as of March 31, 2015 (see Note 12).
	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 is required to make a disclosure of the aggregate estimation. Regions currently estimates that it is reasonably possible that it may experience losses in excess of what Regions has accrued in an aggregate amount up to approximately $160 million as of March 31, 2015, with it also being reasonably possible that Regions could incur no losses in excess of amounts accrued. However, as available information changes, the matters for which Regions is able to estimate, as well as the estimates themselves will be adjusted accordingly. The reasonably possible estimate includes legal contingencies that are subject to the indemnification agreement with Raymond James.
	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 if 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 provided above may not include an estimate for every matter disclosed below.
	Beginning in December 2007, Regions and certain of its affiliates were named in class-action lawsuits filed in federal and state courts on behalf of investors who purchased shares of certain Regions Morgan Keegan Select Funds (the “Funds”) and stockholders of Regions. These cases have been consolidated into class-actions and stockholder derivative actions for the open-end and closed-end Funds. The Funds were formerly managed by Regions Investment Management, Inc. (“Regions Investment Management”). Regions Investment Management no longer manages these Funds, which were transferred to Hyperion Brookfield Asset Management (“Hyperion”) in 2008. Certain of the Funds have since been terminated by Hyperion. The complaints contain various allegations, including claims that the Funds and the defendants misrepresented or failed to disclose material facts relating to the activities of the Funds. Plaintiffs have requested equitable relief and unspecified monetary damages. The U.S. District Court for the Western District of Tennessee has granted final approval of a settlement in the closed-end Funds class-action and shareholder derivative case as well as final approval of a settlement in a consolidated class action under the Employment Retirement Income Security Act. Approvals for settlements in the open-end Funds class action and shareholder derivative case and for investors represented by the Trustee Ad Litem are also being sought. Certain of the shareholders in these Funds and other interested parties have entered into arbitration proceedings and individual civil claims, in lieu of participating in the class actions. These lawsuits and proceedings are subject to the indemnification agreement with Raymond James discussed above.
	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 claims under a civil Racketeer Influenced and Corrupt Organizations (“RICO”) statute 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 have filed an appeal. This matter is subject to the indemnification agreement with Raymond James.
	The Securities and Exchange Commission ("SEC") and states of Missouri and Texas are investigating alleged securities law violations by Morgan Keegan in the underwriting and sale of certain municipal bonds. An enforcement action brought by the Missouri Secretary of State in April 2013, seeking monetary penalties and other relief, was dismissed and refiled in November 2013. A civil action was brought by institutional investors of the bonds in March 2012, seeking a return of their investment and unspecified compensatory and punitive damages. Trial of this case is currently set for November 2015 in the Circuit Court for Cole County, Missouri. A class action was brought on behalf of retail purchasers of the bonds in September 2012, seeking unspecified compensatory and punitive damages. In September 2014, the District Court for the Western District of Missouri granted class certification. The parties agreed to settlement terms in January 2015 and are awaiting final approval of the settlement by the Court. Other individual investors and investor groups have also filed arbitration claims or separate civil claims, which are pending in various stages. These matters are subject to the indemnification agreement with Raymond James.
	In October 2010, a class-action lawsuit was filed by Regions’ stockholders in the U.S. District Court for the Northern District of Alabama (the “District Court”) against Regions and certain former officers of Regions (the "2010 Claim"). The 2010 Claim alleges violations of the federal securities laws, including allegations that materially false and misleading statements were included in filings made with the SEC. The plaintiffs have requested equitable relief and unspecified monetary damages. In June 2011, the District Court denied Regions’ motion to dismiss the 2010 Claim. In June 2012, District Court granted class certification. In September 2014, the Eleventh Circuit Court of Appeals vacated certification in part and remanded the 2010 Claim to District Court for further consideration of the class certification issue. Following recertification in the District Court, Regions filed a petition for permissive appeal in the Eleventh Circuit Court of Appeals concerning the class certification, which was denied, as was a request for reconsideration. Trial is set for November 2015.
	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.
	In 2013, Regions received investigative requests from the Office of Inspector General of the Department of Housing and Urban Development regarding its residential mortgage loan origination, underwriting and quality control practices for Federal Housing Administration ("FHA") insured loans made by Regions. More recently, in September 2014, Regions received an investigative request from the Office of Inspector General of the Federal Housing Finance Agency ("FHFA") regarding its residential mortgage loan origination, underwriting and quality control practices for loans Regions sold to Fannie Mae and Freddie Mac. These inquiries are part of industry-wide investigations, and Regions is cooperating with the inquiries. Many institutions have settled these matters on terms that included large monetary penalties, including, in some cases, civil money penalties under applicable banking laws. The Company cannot predict the ultimate outcome of the investigations concerning its practices, however it is possible that these investigations could result in the payment of a monetary penalty which may adversely affect results of operations.
	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. However, Regions expects the majority of ongoing legal matters related to the indemnification to be resolved within approximately one to two years.
	As of the Closing Date, the fair value of the indemnification obligation, which includes defense costs and unasserted claims, was approximately $385 million, of which approximately $256 million was recognized as a reduction to the gain on sale of Morgan Keegan. The fair value was determined through the use of a present value calculation that takes into account the future cash flows that a market participant would expect to receive from holding the indemnification liability as an asset. Regions performed a probability-weighted cash flow analysis and discounted the result at a credit-adjusted risk free rate. The fair value of the indemnification liability includes amounts that Regions had previously determined meet the definition of probable and reasonably estimable. Adjustments to the indemnification obligation are recorded within professional and legal expenses within discontinued operations (see Note 2). As of March 31, 2015, the carrying value of the indemnification obligation was approximately $204 million.
	VISA INDEMNIFICATION
	As a member of the Visa USA network, Regions, along with other members, indemnified Visa USA against litigation. On October 3, 2007, Visa USA was restructured and acquired several Visa affiliates. In conjunction with this restructuring, Regions' indemnification of Visa USA was modified to cover specific litigation (“covered litigation”).
	A portion of Visa's proceeds from its initial public offering ("IPO") was put into escrow to fund the covered litigation. To the extent that the amount available under the escrow arrangement, or subsequent fundings of the escrow account resulting from reductions in the class B share conversion ratio, is insufficient to fully resolve the covered litigation, Visa will enforce the indemnification obligations of Visa USA's members for any excess amount. At this time, Regions has concluded that it is not probable that covered litigation exposure will exceed the class B share value.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS
	In January 2014, the FASB issued new accounting guidance related to the accounting for investments in qualified affordable housing projects. The guidance allows the holder of low income housing tax credit ("LIHTC") investments to apply a proportional amortization method, which recognizes the amortized cost of the investment as a component of income tax expense, provided that the investment meets certain criteria. The guidance is silent regarding balance sheet classification. Regions believes it would not be appropriate to classify the investment as a deferred tax asset. The decision to apply the proportional amortization method is an accounting policy election. Entities may also elect to continue to account for these investments using the equity method. The guidance became effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and was adopted by Regions for financial reporting beginning with the first quarter of 2015. The adoption is required to be applied retrospectively to all prior periods presented. The cumulative effect to retained earnings (deficit) as of January 1, 2015 of adopting this guidance was reduction of $116 million. Refer to Note 1 for additional information.
	In January 2014, the FASB issued new accounting guidance regarding the reclassification of residential real estate collateralized consumer mortgage loans upon foreclosures. The guidance requires reclassification of a consumer mortgage loan to other real estate owned upon obtaining legal title to the residential property, which could occur either through foreclosure or through a deed in lieu of foreclosure or similar legal agreement. The existence of a borrower redemption right will not prevent the lender from reclassifying a loan to other real estate once the lender obtains legal title to the property. In addition, entities are required to disclose the amount of foreclosed residential real estate properties and the recorded investment in residential real estate mortgage loans in the process of foreclosure on both an interim and annual basis. This guidance became effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014 and was adopted by Regions on a prospective basis with the first quarter of 2015 reporting. This guidance did not have a material impact upon adoption.
	In June 2014, the FASB issued new accounting guidance that requires two accounting changes related to the transfer and servicing of repurchase agreements and similar transactions. First, the amendments in the update change the accounting for repurchase-to-maturity transactions to secured borrowing accounting. Second, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in the update also require certain disclosures for transfers of financial assets and repurchase agreements. The disclosure of certain transactions accounted for as a sale is required to be presented for fiscal years and interim periods within those years beginning after December 15, 2014 and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowing is required to be presented for fiscal years beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The accounting changes were effective for fiscal years and interim periods within those years beginning after December 15, 2014 and were adopted by Regions with the first quarter 2015 reporting. This guidance did not have a material impact upon adoption.
	In August 2014, the FASB issued new accounting guidance regarding the classification and measurement of foreclosed mortgage loans that are guaranteed by the government (including loans guaranteed by the FHA and the VA). The guidance addresses diversity in practice by requiring creditors to derecognize the mortgage loan upon foreclosure and to recognize a separate other receivable if the following conditions are met: (a) the government guarantee of the loan is not separable from the loan before foreclosure; (b) upon foreclosure, the creditor has the intent to convey the real estate to the guarantor and to make a claim on the guarantee, and also has the ability to make a recovery under the claim; and (c) claim amounts based on the fair value of the property are fixed upon foreclosure. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. This guidance became effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014 and was adopted by Regions on a prospective basis with the first quarter of 2015 reporting. This guidance did not have a material impact upon adoption.
	In August 2014, the FASB issued new accounting guidance to offer a measurement alternative for reporting entities that consolidate a collateralized financing entity ("CFE") in which the financial assets and financial liabilities are measured at fair value, with changes in fair values reflected in earnings. Under the measurement alternative, the reporting entity could elect to measure both the CFE’s financial assets and financial liabilities using the fair value of either the CFE’s financial assets or financial liabilities, whichever is more observable. This guidance became effective for the first quarter of 2015 financial reporting period. This guidance did not have a material impact upon adoption.
	In February 2015, the FASB issued new accounting guidance that eliminates the consolidation model created specifically for limited partnerships and creates a single model for evaluating consolidation of legal entities. The new guidance does the following: (a) modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities; (b) eliminates the presumption that a general partner should consolidate a limited partnership; (c) modifies the consolidation analysis for all reporting entities associated with VIEs, particularly those that have fee arrangements and related party relationships; and (d) provides a scope exception from the consolidation guidance for reporting entities with interests in legal entities that are similar to investment companies as defined in the Investment Company Act of 1940. The guidance is effective for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. Regions believes the adoption of this guidance will not have a material impact to its consolidated financial statements.
	Further information related to recent accounting pronouncements and accounting changes adopted by Regions prior to the first quarter of 2015 is included in the Annual Report on Form 10-K for the year ended December 31, 2014.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following table represents the condensed results of operations for discontinued operations:
		Three Months Ended March 31
		2015			2014
		(In millions, except per share data)
	Non-interest expense:
	Professional and legal expenses	$	4		$	(19	)
	Total non-interest expense	4			(19		)
	Income (loss) from discontinued operations before income taxes	(4		)	19
	Income tax expense (benefit)	(2		)	7
	Income (loss) from discontinued operations, net of tax	$	(2	)	$	12
	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, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost, Gross Unrealized Gains And Losses, And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity	The amortized cost, gross unrealized gains and losses, and estimated fair value of securities held to maturity and securities available for sale are as follows:
		31-Mar-15
				Recognized in OCI (1)									Not recognized in OCI
		Amortized		Gross Unrealized Gains			Gross Unrealized Losses			Carrying Value			Gross		Gross			Estimated
		Cost											Unrealized		Unrealized			Fair
													Gains		Losses			Value
		(In millions)
	Securities held to maturity:
	U.S. Treasury securities	$	1	$	—		$	—		$	1		$	—	$	—		$	1
	Federal agency securities	350		—			(12		)	338			10		—			348
	Mortgage-backed securities:
	Residential agency	1,655		—			(69		)	1,586			49		—			1,635
	Commercial agency	210		—			(6		)	204			—		(2		)	202
		$	2,216	$	—		$	(87	)	$	2,129		$	59	$	(2	)	$	2,186
	Securities available for sale:
	U.S. Treasury securities	$	178	$	2		$	—		$	180							$	180
	Federal agency securities	230		4			—			234								234
	Obligations of states and political subdivisions	2		—			—			2								2
	Mortgage-backed securities:
	Residential agency	15,838		329			(14		)	16,153								16,153
	Residential non-agency	7		—			—			7								7
	Commercial agency	1,964		29			(3		)	1,990								1,990
	Commercial non-agency	1,535		23			(2		)	1,556								1,556
	Corporate and other debt securities	2,047		50			(23		)	2,074								2,074
	Equity securities	670		13			—			683								683
		$	22,471	$	450		$	(42	)	$	22,879							$	22,879
		December 31, 2014
				Recognized in OCI (1)									Not recognized in OCI
		Amortized		Gross Unrealized Gains			Gross Unrealized Losses			Carrying Value			Gross		Gross			Estimated
		Cost											Unrealized		Unrealized			Fair
													Gains		Losses			Value
		(In millions)
	Securities held to maturity:
	U.S. Treasury securities	$	1	$	—		$	—		$	1		$	—	$	—		$	1
	Federal agency securities	350		—			(12		)	338			6		—			344
	Mortgage-backed securities:
	Residential agency	1,698		—			(71		)	1,627			35		(1		)	1,661
	Commercial agency	216		—			(7		)	209			—		(6		)	203
		$	2,265	$	—		$	(90	)	$	2,175		$	41	$	(7	)	$	2,209
	Securities available for sale:
	U.S. Treasury securities	$	176	$	—		$	—		$	176							$	176
	Federal agency securities	233		2			—			235								235
	Obligations of states and political subdivisions	2		—			—			2								2
	Mortgage-backed securities:
	Residential agency	15,788		283			(33		)	16,038								16,038
	Residential non-agency	7		1			—			8								8
	Commercial agency	1,959		14			(9		)	1,964								1,964
	Commercial non-agency	1,489		14			(9		)	1,494								1,494
	Corporate and other debt securities	1,980		36			(26		)	1,990								1,990
	Equity securities	662		12			(1		)	673								673
		$	22,296	$	362		$	(78	)	$	22,580							$	22,580
	_________
	(1) The gross unrealized losses recognized in other comprehensive income (OCI) on held to maturity securities resulted from a transfer of available for sale securities to held to maturity in the second quarter of 2013.
Schedule Of Amortized Cost Of Equity Securities Related To Federal Reserve Bank Stock And Federal Home Loan Bank Stock	Equity securities in the tables above included the following amortized cost related to Federal Reserve Bank stock and Federal Home Loan Bank (“FHLB”) stock. Shares in the Federal Reserve Bank and FHLB are accounted for at amortized cost, which approximates fair value.
		March 31, 2015		December 31, 2014
		(In millions)
	Federal Reserve Bank	$	488	$	488
	Federal Home Loan Bank	16		39
Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity	The amortized cost and estimated fair value of securities available for sale and securities held to maturity at March 31, 2015, 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		Estimated
		Cost		Fair Value
		(In millions)
	Securities held to maturity:
	Due in one year or less	$	—	$	—
	Due after one year through five years	1		1
	Due after five years through ten years	350		348
	Mortgage-backed securities:
	Residential agency	1,655		1,635
	Commercial agency	210		202
		$	2,216	$	2,186
	Securities available for sale:
	Due in one year or less	$	105	$	105
	Due after one year through five years	975		998
	Due after five years through ten years	1,042		1,051
	Due after ten years	335		336
	Mortgage-backed securities:
	Residential agency	15,838		16,153
	Residential non-agency	7		7
	Commercial agency	1,964		1,990
	Commercial non-agency	1,535		1,556
	Equity securities	670		683
		$	22,471	$	22,879
Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale and Held to Maturity	The following tables present gross unrealized losses and the related estimated fair value of securities available for sale and held to maturity at March 31, 2015 and December 31, 2014. For 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.
		31-Mar-15
		Less Than Twelve Months					Twelve Months or More						Total
		Estimated		Gross			Estimated			Gross			Estimated		Gross
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In millions)
	Securities held to maturity:
	Federal agency securities	$	149	$	(1	)	$	199		$	(1	)	$	348	$	(2	)
	Mortgage-backed securities:
	Residential agency	289		(1		)	1,267			(19		)	1,556		(20		)
	Commercial agency	—		—			202			(8		)	202		(8		)
		$	438	$	(2	)	$	1,668		$	(28	)	$	2,106	$	(30	)
	Securities available for sale:
	U.S. Treasury securities	$	11	$	—		$	—		$	—		$	11	$	—
	Federal agency securities	—		—			6			—			6		—
	Mortgage-backed securities:
	Residential agency	1,318		(5		)	978			(9		)	2,296		(14		)
	Commercial agency	415		(2		)	247			(1		)	662		(3		)
	Commercial non-agency	62		(1		)	240			(1		)	302		(2		)
	All other securities	323		(8		)	267			(15		)	590		(23		)
		$	2,129	$	(16	)	$	1,738		$	(26	)	$	3,867	$	(42	)
		31-Dec-14
		Less Than Twelve Months					Twelve Months or More						Total
		Estimated		Gross			Estimated			Gross			Estimated		Gross
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(In millions)
	Securities held to maturity:
	Federal agency securities	$	—	$	—		$	344		$	(6	)	$	344	$	(6	)
	Mortgage-backed securities:
	Residential agency	—		—			1,659			(37		)	1,659		(37		)
	Commercial agency	—		—			203			(13		)	203		(13		)
		$	—	$	—		$	2,206		$	(56	)	$	2,206	$	(56	)
	Securities available for sale:
	U.S. Treasury securities	$	74	$	—		$	3		$	—		$	77	$	—
	Federal agency securities	—		—			3			—			3		—
	Mortgage-backed securities:
	Residential agency	1,178		(5		)	2,587			(28		)	3,765		(33		)
	Commercial agency	464		(4		)	316			(5		)	780		(9		)
	Commercial non-agency	242		(1		)	500			(8		)	742		(9		)
	All other securities	400		(7		)	455			(20		)	855		(27		)
		$	2,358	$	(17	)	$	3,864		$	(61	)	$	6,222	$	(78	)
Schedule Of Gross Realized Gains And Gross Realized Losses On Available For Sale Securities	Gross realized gains and gross realized losses on sales of 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
		2015		2014
		(In millions)
	Gross realized gains	$	5	$	3
	Gross realized losses	—		(1		)
	Securities gains, net	$	5	$	2

Loans_and_the_Allowance_for_Cr1

Loans and the Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2015				December 31, 2014
		(In millions, net of unearned income)
	Commercial and industrial	$	33,681			$	32,732
	Commercial real estate mortgage—owner-occupied	8,043				8,263
	Commercial real estate construction—owner-occupied	437				407
	Total commercial	42,161				41,402
	Commercial investor real estate mortgage	4,499				4,680
	Commercial investor real estate construction	2,422				2,133
	Total investor real estate	6,921				6,813
	Residential first mortgage	12,418				12,315
	Home equity	10,854				10,932
	Indirect	3,701				3,642
	Consumer credit card	966				1,009
	Other consumer	1,222				1,194
	Total consumer	29,161				29,092
		$	78,243			$	77,307
Analysis of the Allowance for Credit Losses by Portfolio Segment
		Three Months Ended March 31, 2015
		Commercial				Investor Real				Consumer			Total
						Estate
		(In millions)
	Allowance for loan losses, January 1, 2015	$	654			$	150			$	299		$	1,103
	Provision (credit) for loan losses	59				(25		)		15			49
	Loan losses:
	Charge-offs	(34		)		(8		)		(59		)	(101		)
	Recoveries	17				8				22			47
	Net loan losses	(17		)		—				(37		)	(54		)
	Allowance for loan losses, March 31, 2015	696				125				277			1,098
	Reserve for unfunded credit commitments, January 1, 2015	57				8				—			65
	Provision (credit) for unfunded credit losses	1				—				—			1
	Reserve for unfunded credit commitments, March 31, 2015	58				8				—			66
	Allowance for credit losses, March 31, 2015	$	754			$	133			$	277		$	1,164
	Portion of ending allowance for loan losses:
	Individually evaluated for impairment	$	178			$	49			$	73		$	300
	Collectively evaluated for impairment	518				76				204			798
	Total allowance for loan losses	$	696			$	125			$	277		$	1,098
	Portion of loan portfolio ending balance:
	Individually evaluated for impairment	$	766			$	320			$	857		$	1,943
	Collectively evaluated for impairment	41,395				6,601				28,304			76,300
	Total loans evaluated for impairment	$	42,161			$	6,921			$	29,161		$	78,243
		Three Months Ended March 31, 2014
		Commercial				Investor Real				Consumer			Total
						Estate
		(In millions)
	Allowance for loan losses, January 1, 2014	$	711			$	236			$	394		$	1,341
	Provision (credit) for loan losses	5				(27		)		24			2
	Loan losses:
	Charge-offs	(41		)		(9		)		(74		)	(124		)
	Recoveries	17				8				17			42
	Net loan losses	(24		)		(1		)		(57		)	(82		)
	Allowance for loan losses, March 31, 2014	692				208				361			1,261
	Reserve for unfunded credit commitments, January 1, 2014	63				12				3			78
	Provision (credit) for unfunded credit losses	—				(1		)		1			—
	Reserve for unfunded credit commitments, March 31, 2014	63				11				4			78
	Allowance for credit losses, March 31, 2014	$	755			$	219			$	365		$	1,339
	Portion of ending allowance for loan losses:
	Individually evaluated for impairment	$	223			$	98			$	90		$	411
	Collectively evaluated for impairment	469				110				271			850
	Total allowance for loan losses	$	692			$	208			$	361		$	1,261
	Portion of loan portfolio ending balance:
	Individually evaluated for impairment	$	1,006			$	676			$	869		$	2,551
	Collectively evaluated for impairment	39,092				6,316				27,721			73,129
	Total loans evaluated for impairment	$	40,098			$	6,992			$	28,590		$	75,680
Financing Receivable Credit Quality Indicators
		31-Mar-15
		Pass				Special  Mention				Substandard			Non-accrual			Total
										Accrual
		(In millions)
	Commercial and industrial	$	32,185			$	600			$	598		$	298		$	33,681
	Commercial real estate mortgage—owner-occupied	7,207				311				309			216			8,043
	Commercial real estate construction—owner-occupied	405				15				14			3			437
	Total commercial	$	39,797			$	926			$	921		$	517		$	42,161
	Commercial investor real estate mortgage	$	4,096			$	150			$	168		$	85		$	4,499
	Commercial investor real estate construction	2,365				21				36			—			2,422
	Total investor real estate	$	6,461			$	171			$	204		$	85		$	6,921
										Accrual			Non-accrual			Total
										(In millions)
	Residential first mortgage									$	12,317		$	101		$	12,418
	Home equity									10,757			97			10,854
	Indirect									3,701			—			3,701
	Consumer credit card									966			—			966
	Other consumer									1,222			—			1,222
	Total consumer									$	28,963		$	198		$	29,161
																$	78,243
		December 31, 2014
		Pass				Special				Substandard			Non-accrual			Total
						Mention				Accrual
		(In millions)
	Commercial and industrial	$	31,492			$	626			$	362		$	252		$	32,732
	Commercial real estate mortgage—owner-occupied	7,425				315				285			238			8,263
	Commercial real estate construction—owner-occupied	387				9				8			3			407
	Total commercial	$	39,304			$	950			$	655		$	493		$	41,402
	Commercial investor real estate mortgage	$	4,152			$	234			$	171		$	123		$	4,680
	Commercial investor real estate construction	2,060				22				49			2			2,133
	Total investor real estate	$	6,212			$	256			$	220		$	125		$	6,813
										Accrual			Non-accrual			Total
										(In millions)
	Residential first mortgage									$	12,206		$	109		$	12,315
	Home equity									10,830			102			10,932
	Indirect									3,642			—			3,642
	Consumer credit card									1,009			—			1,009
	Other consumer									1,194			—			1,194
	Total consumer									$	28,881		$	211		$	29,092
																$	77,307
Past Due Financing Receivables	The following tables include an aging analysis of days past due (DPD) for each portfolio segment and class as of March 31, 2015 and December 31, 2014:
		31-Mar-15
		Accrual Loans
		30-59 DPD				60-89 DPD				90+ DPD			Total			Total		Non-accrual		Total
													30+ DPD			Accrual
		(In millions)
	Commercial and industrial	$	17			$	10			$	4		$	31		$	33,383	$	298	$	33,681
	Commercial real estate	24				6				7			37			7,827		216		8,043
	mortgage—owner-occupied
	Commercial real estate construction—owner-occupied	—				—				—			—			434		3		437
	Total commercial	41				16				11			68			41,644		517		42,161
	Commercial investor real estate mortgage	7				2				2			11			4,414		85		4,499
	Commercial investor real estate construction	4				—				—			4			2,422		—		2,422
	Total investor real estate	11				2				2			15			6,836		85		6,921
	Residential first mortgage	84				43				225			352			12,317		101		12,418
	Home equity	64				37				67			168			10,757		97		10,854
	Indirect	34				7				6			47			3,701		—		3,701
	Consumer credit card	6				5				12			23			966		—		966
	Other consumer	9				3				4			16			1,222		—		1,222
	Total consumer	197				95				314			606			28,963		198		29,161
		$	249			$	113			$	327		$	689		$	77,443	$	800	$	78,243
		December 31, 2014
		Accrual Loans
		30-59 DPD				60-89 DPD				90+ DPD			Total			Total		Non-accrual		Total
													30+ DPD			Accrual
		(In millions)
	Commercial and industrial	$	16			$	7			$	7		$	30		$	32,480	$	252	$	32,732
	Commercial real estate	21				13				5			39			8,025		238		8,263
	mortgage—owner-occupied
	Commercial real estate construction—owner-occupied	1				—				—			1			404		3		407
	Total commercial	38				20				12			70			40,909		493		41,402
	Commercial investor real estate mortgage	17				3				3			23			4,557		123		4,680
	Commercial investor real estate construction	—				—				—			—			2,131		2		2,133
	Total investor real estate	17				3				3			23			6,688		125		6,813
	Residential first mortgage	99				64				247			410			12,206		109		12,315
	Home equity	73				38				63			174			10,830		102		10,932
	Indirect	43				10				7			60			3,642		—		3,642
	Consumer credit card	8				5				12			25			1,009		—		1,009
	Other consumer	13				4				3			20			1,194		—		1,194
	Total consumer	236				121				332			689			28,881		211		29,092
		$	291			$	144			$	347		$	782		$	76,478	$	829	$	77,307
Impaired Financing Receivables	The following tables present details related to the Company’s impaired loans as of March 31, 2015 and December 31, 2014. Loans deemed to be impaired include all TDRs and all non-accrual commercial and investor real estate loans, excluding leases. Loans which have been fully charged-off do not appear in the tables below.
		Non-accrual Impaired Loans As of March 31, 2015
										Book Value(3)
		Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
		Principal				and Payments				Impaired			Loans on			Loans on		Allowance
		Balance(1)				Applied(2)				Loans on			Non-accrual			Non-accrual		for Loan
										Non-accrual			Status with			Status with		Losses
										Status			No Related			Related
													Allowance			Allowance
		(Dollars in millions)
	Commercial and industrial	$	333			$	36			$	297		$	39		$	258	$	77	33.9	%
	Commercial real estate mortgage—owner-occupied	239				23				216			39			177		63		36
	Commercial real estate construction—owner-occupied	3				—				3			—			3		2		66.7
	Total commercial	575				59				516			78			438		142		35
	Commercial investor real estate mortgage	122				37				85			18			67		19		45.9
	Commercial investor real estate construction	1				1				—			—			—		—		100
	Total investor real estate	123				38				85			18			67		19		46.3
	Residential first mortgage	73				24				49			—			49		6		41.1
	Home equity	21				7				14			—			14		1		38.1
	Total consumer	94				31				63			—			63		7		40.4
		$	792			$	128			$	664		$	96		$	568	$	168	37.4	%
		Accruing Impaired Loans As of March 31, 2015
		Unpaid				Charge-offs				Book Value(3)			Related			Coverage %(4)
		Principal				and Payments							Allowance for
		Balance(1)				Applied(2)							Loan Losses
		(Dollars in millions)
	Commercial and industrial	$	104			$	1			$	103		$	19		19.2	%
	Commercial real estate mortgage—owner-occupied	157				10				147			17			17.2
	Commercial real estate construction—owner-occupied	1				1				—			—			100
	Total commercial	262				12				250			36			18.3
	Commercial investor real estate mortgage	211				8				203			24			15.2
	Commercial investor real estate construction	32				—				32			6			18.8
	Total investor real estate	243				8				235			30			15.6
	Residential first mortgage	439				10				429			56			15
	Home equity	353				6				347			10			4.5
	Indirect	1				—				1			—			—
	Consumer credit card	2				—				2			—			—
	Other consumer	15				—				15			—			—
	Total consumer	810				16				794			66			10.1
		$	1,315			$	36			$	1,279		$	132		12.8	%
		Total Impaired Loans As of March 31, 2015
										Book Value(3)
		Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
		Principal				and Payments				Impaired			Loans with No			Loans with		Allowance
		Balance(1)				Applied(2)				Loans			Related			Related		for Loan
													Allowance			Allowance		Losses
		(Dollars in millions)
	Commercial and industrial	$	437			$	37			$	400		$	39		$	361	$	96	30.4	%
	Commercial real estate mortgage—owner-occupied	396				33				363			39			324		80		28.5
	Commercial real estate construction—owner-occupied	4				1				3			—			3		2		75
	Total commercial	837				71				766			78			688		178		29.7
	Commercial investor real estate mortgage	333				45				288			18			270		43		26.4
	Commercial investor real estate construction	33				1				32			—			32		6		21.2
	Total investor real estate	366				46				320			18			302		49		26
	Residential first mortgage	512				34				478			—			478		62		18.8
	Home equity	374				13				361			—			361		11		6.4
	Indirect	1				—				1			—			1		—		—
	Consumer credit card	2				—				2			—			2		—		—
	Other consumer	15				—				15			—			15		—		—
	Total consumer	904				47				857			—			857		73		13.3
		$	2,107			$	164			$	1,943		$	96		$	1,847	$	300	22	%
	_________
	-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.
	Non-accrual Impaired Loans As of December 31, 2014
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans on			Loans on		Allowance
	Balance(1)				Applied(2)				Loans on			Non-accrual			Non-accrual		for Loan
									Non-accrual			Status with			Status with		Losses
									Status			No Related			Related
												Allowance			Allowance
	(Dollars in millions)
Commercial and industrial	$	286			$	36			$	250		$	11		$	239	$	83	41.6	%
Commercial real estate mortgage—owner-occupied	267				29				238			43			195		69		36.7
Commercial real estate construction—owner-occupied	3				—				3			—			3		1		33.3
Total commercial	556				65				491			54			437		153		39.2
Commercial investor real estate mortgage	162				39				123			26			97		30		42.6
Commercial investor real estate construction	3				1				2			—			2		1		66.7
Total investor real estate	165				40				125			26			99		31		43
Residential first mortgage	79				26				53			—			53		7		41.8
Home equity	22				7				15			—			15		1		36.4
Total consumer	101				33				68			—			68		8		40.6
	$	822			$	138			$	684		$	80		$	604	$	192	40.1	%
	Accruing Impaired Loans As of December 31, 2014
	Unpaid				Charge-offs				Book Value(3)			Related			Coverage %(4)
	Principal				and Payments							Allowance for
	Balance(1)				Applied(2)							Loan Losses
	(Dollars in millions)
Commercial and industrial	$	102			$	3			$	99		$	17		19.6	%
Commercial real estate mortgage—owner-occupied	162				10				152			16			16
Total commercial	264				13				251			33			17.4
Commercial investor real estate mortgage	267				8				259			28			13.5
Commercial investor real estate construction	33				—				33			6			18.2
Total investor real estate	300				8				292			34			14
Residential first mortgage	426				11				415			57			16
Home equity	359				6				353			13			5.3
Indirect	1				—				1			—			—
Consumer credit card	2				—				2			—			—
Other consumer	17				—				17			—			—
Total consumer	805				17				788			70			10.8
	$	1,369			$	38			$	1,331		$	137		12.8	%
	Total Impaired Loans As of December 31, 2014
									Book Value(3)
	Unpaid				Charge-offs				Total			Impaired			Impaired		Related		Coverage %(4)
	Principal				and Payments				Impaired			Loans with No			Loans with		Allowance for
	Balance(1)				Applied(2)				Loans			Related			Related		Loan Losses
												Allowance			Allowance
	(Dollars in millions)
Commercial and industrial	$	388			$	39			$	349		$	11		$	338	$	100	35.8	%
Commercial real estate mortgage—owner-occupied	429				39				390			43			347		85		28.9
Commercial real estate construction—owner-occupied	3				—				3			—			3		1		33.3
Total commercial	820				78				742			54			688		186		32.2
Commercial investor real estate mortgage	429				47				382			26			356		58		24.5
Commercial investor real estate construction	36				1				35			—			35		7		22.2
Total investor real estate	465				48				417			26			391		65		24.3
Residential first mortgage	505				37				468			—			468		64		20
Home equity	381				13				368			—			368		14		7.1
Indirect	1				—				1			—			1		—		—
Consumer credit card	2				—				2			—			2		—		—
Other consumer	17				—				17			—			17		—		—
Total consumer	906				50				856			—			856		78		14.1
	$	2,191			$	176			$	2,015		$	80		$	1,935	$	329	23	%
________
-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, 2015 and 2014. Interest income recognized represents interest on accruing loans modified in a TDR. TDRs are considered impaired loans.
	Three Months Ended March 31
	2015								2014
	Average				Interest				Average			Interest
	Balance				Income				Balance			Income
					Recognized							Recognized
	(In millions)
Commercial and industrial	$	359			$	1			$	467		$	3
Commercial real estate mortgage—owner-occupied	379				3				511			4
Commercial real estate construction—owner-occupied	3				—				41			—
Total commercial	741				4				1,019			7
Commercial investor real estate mortgage	331				3				620			8
Commercial investor real estate construction	33				1				87			1
Total investor real estate	364				4				707			9
Residential first mortgage	476				4				457			4
Home equity	363				5				387			5
Indirect	1				—				1			—
Consumer credit card	2				—				2			—
Other consumer	15				—				24			—
Total consumer	857				9				871			9
Total impaired loans	$	1,962			$	17			$	2,597		$	25
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. The end of period balance, for the period in which it was added, of total loans first reported as new TDRs totaled approximately $107 million and $121 million for the three months ended March 31, 2015 and 2014, respectively.
		Three Months Ended March 31, 2015
									Financial Impact
									of Modifications
									Considered TDRs
		Number of			Recorded				Increase in
		Obligors			Investment				Allowance at
									Modification
		(Dollars in millions)
	Commercial and industrial	41			$	57			$	1
	Commercial real estate mortgage—owner-occupied	42			25				1
	Total commercial	83			82				2
	Commercial investor real estate mortgage	29			24				1
	Commercial investor real estate construction	1			1				—
	Total investor real estate	30			25				1
	Residential first mortgage	133			32				4
	Home equity	125			6				—
	Consumer credit card	32			—				—
	Indirect and other consumer	87			1				—
	Total consumer	377			39				4
		490			$	146			$	7
		Three Months Ended March 31, 2014
									Financial Impact
									of Modifications
									Considered TDRs
		Number of			Recorded				Increase in
		Obligors			Investment				Allowance at
									Modification
		(Dollars in millions)
	Commercial and industrial	91			$	94			$	—
	Commercial real estate mortgage—owner-occupied	85			70				1
	Commercial real estate construction—owner-occupied	1			1				—
	Total commercial	177			165				1
	Commercial investor real estate mortgage	98			107				—
	Commercial investor real estate construction	15			7				—
	Total investor real estate	113			114				—
	Residential first mortgage	125			24				4
	Home equity	154			10				—
	Consumer credit card	32			—				—
	Indirect and other consumer	51			1				—
	Total consumer	362			35				4
		652			$	314			$	5
	Defaulted TDRs
	The following table presents by portfolio segment and class TDRs that defaulted during the three months ended March 31, 2015 and 2014, and that were modified in the previous twelve months (i.e., the twelve months prior to the default). For purposes of this disclosure, default is defined as 90 days past due and still accruing for the consumer portfolio segment, and placement on non-accrual status for the commercial and investor real estate portfolio segments. Consideration of defaults in the calculation of the allowance for loan losses is described in detail in the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2014.
		Three Months Ended March 31
		2015				2014
		(In millions)
	Defaulted During the Period, Where Modified in a TDR Twelve Months Prior to Default
	Commercial and industrial	$	1			$	42
	Commercial real estate mortgage—owner-occupied	1				3
	Total commercial	2				45
	Commercial investor real estate mortgage	1				2
	Commercial investor real estate construction	—				1
	Total investor real estate	1				3
	Residential first mortgage	3				9
	Home equity	—				1
	Total consumer	3				10
		$	6			$	58

Servicing_of_Financial_Assets_

Servicing of Financial Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Transfers and Servicing of Financial Assets [Abstract]
Schedule of Servicing Rights Under The Fair Value Measurement Method	The table below presents an analysis of residential mortgage servicing rights under the fair value measurement method:
		Three Months Ended March 31
		2015			2014
		(In millions)
	Carrying value, beginning of period	$	257		$	297
	Additions	7			8
	Increase (decrease) in fair value(1):
	Due to change in valuation inputs or assumptions	(17		)	(10		)
	Economic amortization associated with borrower repayments	(8		)	(7		)
	Carrying value, end of period	$	239		$	288
	________
	(1) "Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. Prior to the fourth quarter of 2014, this line item reflected total loan payoffs only, while partial paydowns were included in the "Due to change in valuation inputs or assumptions" line item. The 2014 three months ended amount disclosed in the table has been reclassified to reflect the revised presentation.
Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To 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 mortgage servicing rights (excluding related derivative instruments) are as follows:
		31-Mar
		2015			2014
		(Dollars in millions)
	Unpaid principal balance	$	26,903		$	27,785
	Weighted-average prepayment speed (CPR; percentage)	12.7		%	9.3		%
	Estimated impact on fair value of a 10% increase	$	(14	)	$	(12	)
	Estimated impact on fair value of a 20% increase	$	(27	)	$	(23	)
	Option-adjusted spread (basis points)	1,006			880
	Estimated impact on fair value of a 10% increase	$	(9	)	$	(9	)
	Estimated impact on fair value of a 20% increase	$	(18	)	$	(18	)
	Weighted-average coupon interest rate	4.4		%	4.5		%
	Weighted-average remaining maturity (months)	279			279
	Weighted-average servicing fee (basis points)	27.8			27.7
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
		2015			2014
		(In millions)
	Servicing related fees and other ancillary income	$	20		$	21
Analysis Of Repurchase Liability Related To Residential Mortgage Loans Sold With Representations And Warranty Provisions	The table below presents an analysis of Regions’ repurchase liability related to residential mortgage loans sold with representations and warranty provisions:
		Three Months Ended March 31
		2015			2014
		(In millions)
	Beginning balance	$	26		$	39
	Additions (reductions), net	1			3
	Losses	(1		)	(3		)
	Ending balance	$	26		$	39

Goodwill_Tables

Goodwill (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill allocated to each reportable segment (each a reporting unit) is presented as follows:
		31-Mar-15		December 31, 2014
		(In millions)
	Corporate Bank	$	2,258	$	2,258
	Consumer Bank	2,095		2,095
	Wealth Management	463		463
		$	4,816	$	4,816

Stockholders_Equity_and_Accumu1

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of Auction Market Preferred Securities by Stock Series	The following table presents a summary of the non-cumulative perpetual preferred stock:
										31-Mar-15			December 31, 2014
		Issuance Date		Earliest Redemption Date	Dividend Rate			Liquidation Amount		Carrying Amount			Carrying Amount
		(Dollars in millions)
	Series A	11/1/12		12/15/17	6.375	%		$	500	$	411		$	419
	Series B	4/29/14		9/15/24	6.375	%	(1)	500		457			465
								$	1,000	$	868		$	884
	_________
	(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) is shown in the following tables:
		Three Months Ended March 31, 2015
		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
													income (loss), net of tax
		(In millions)
	Beginning of period	$	(55	)	$	175		$	33	$	(391	)	$	(238	)
	Net change	2			77			37		7			123
	End of period	$	(53	)	$	252		$	70	$	(384	)	$	(115	)
		Three Months Ended March 31, 2014
		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
													income (loss), net of tax
		(In millions)
	Beginning of period	$	(64	)	$	(22	)	$	15	$	(248	)	$	(319	)
	Net change	2			78			6		4			90
	End of period	$	(62	)	$	56		$	21	$	(244	)	$	(229	)
Reclassification From Accumulated Other Comprehensive Income (Loss)	The following tables present amounts reclassified out of accumulated other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	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
		1			1			Tax (expense) or benefit
		$	(2	)	$	(2	)	Net of tax
	Unrealized gains and (losses) on available-for-sale securities:
		$	5		$	2		Securities gains, net
		(2		)	(1		)	Tax (expense) or benefit
		$	3		$	1		Net of tax
	Gains and (losses) on cash flow hedges:
	Interest rate contracts	$	33		$	28		Net interest income
		(12		)	(11		)	Tax (expense) or benefit
		$	21		$	17		Net of tax
	Amortization of defined benefit pension plans and other post employment benefits:
	Prior-service cost	$	—		$	—		(2)
	Actuarial gains (losses)	(12		)	(6		)	(2)
		(12		)	(6		)	Total before tax
		4			2			Tax (expense) or benefit
		$	(8	)	$	(4	)	Net of tax
	Total reclassifications for the period	$	14		$	12		Net of tax
	________
	(1) Amounts in parentheses indicate reductions to net income.
	(2) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost and are included in salaries and employee benefits on the consolidated statements of income (see Note 10 for additional details).

Earnings_Per_Common_Share_Comp1

Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Common Share) Schedule of Earnings Per Share, Basic and Diluted (Tables)	3 Months Ended
	Mar. 31, 2015
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
		2015			2014
		(In millions, except per share amounts)
	Numerator:
	Income from continuing operations	$	236		$	303
	Preferred stock dividends	(16		)	(8		)
	Income from continuing operations available to common shareholders	220			295
	Income (loss) from discontinued operations, net of tax	(2		)	12
	Net income available to common shareholders	$	218		$	307
	Denominator:
	Weighted-average common shares outstanding—basic	1,346			1,378
	Potential common shares	12			12
	Weighted-average common shares outstanding—diluted	1,358			1,390
	Earnings per common share from continuing operations available to common shareholders(1):
	Basic	$	0.16		$	0.21
	Diluted	0.16			0.21
	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	0.16			0.22
	Diluted	0.16			0.22
	________
	-1	Certain per share amounts may not appear to reconcile due to rounding.

ShareBased_Payments_Tables

Share-Based Payments (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes the activity related to stock options:
		Three Months Ended March 31
		2015				2014
		Number of		Weighted-Average		Number of		Weighted-Average
		Options		Exercise Price		Options		Exercise Price
	Outstanding at beginning of period	25,316,676		$	23.07	32,127,235		$	22.81
	Granted	—		—		—		—
	Exercised	(42,056	)	7		(1,330,599	)	4.29
	Canceled/Forfeited	(4,867,902	)	33.77		(4,070,485	)	30.53
	Outstanding at end of period	20,406,718		$	20.98	26,726,151		$	22.55
	Exercisable at end of period	20,406,718		$	20.98	26,293,952		$	22.82
Summary Of Activity Related To Restricted Stock Awards And Performance Stock Awards	The following table summarizes the activity related to restricted stock awards and performance stock awards:
		Three Months Ended March 31
		2015				2014
		Number of		Weighted-Average		Number of		Weighted-Average
		Shares		Grant Date Fair Value		Shares		Grant Date Fair Value
	Non-vested at beginning of period	18,427,409		$	8.07	16,212,198		$	6.83
	Granted	454,147		5.88		21,233		9.89
	Vested	(591,101	)	6.15		(494,932	)	7.28
	Forfeited	(152,044	)	8.06		(59,149	)	7
	Non-vested at end of period	18,138,411		$	8.13	15,679,350		$	6.82

Pension_and_Other_Postretireme1

Pension and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Schedule of Net Periodic Pension Cost	Net periodic pension cost, which is recorded in salaries and employee benefits on the consolidated statements of income, included the following components:
		Qualified Plan						Non-qualified Plans				Total
		Three Months Ended March 31
		2015			2014			2015		2014		2015			2014
		(In millions)
	Service cost	$	10		$	8		$	1	$	1	$	11		$	9
	Interest cost	21			22			1		1		22			23
	Expected return on plan assets	(36		)	(34		)	—		—		(36		)	(34		)
	Amortization of actuarial loss	11			5			1		1		12			6
	Amortization of prior service cost	—			—			—		—		—			—
	Net periodic pension cost	$	6		$	1		$	3	$	3	$	9		$	4

Derivative_Financial_Instrumen1

Derivative Financial Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2015 and December 31, 2014.
		31-Mar-15										December 31, 2014
		Notional			Estimated Fair Value							Notional				Estimated Fair Value
		Amount			Gain(1)			Loss(1)				Amount				Gain(1)		Loss(1)
		(In millions)
	Derivatives in fair value hedging relationships:
	Interest rate swaps	$	2,410		$	13		$	47			$	2,817			$	6	$	30
	Derivatives in cash flow hedging relationships:
	Interest rate swaps	8,950			84			6				8,050				38		31
	Total derivatives designated as hedging instruments	$	11,360		$	97		$	53			$	10,867			$	44	$	61
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	45,892		$	948		$	971			$	45,860			$	941	$	972
	Interest rate options	2,824			15			1				3,016				10		2
	Interest rate futures and forward commitments	16,010			8			8				17,978				3		8
	Other contracts	4,203			213			206				4,149				217		211
	Total derivatives not designated as hedging instruments	$	68,929		$	1,184		$	1,186			$	71,003			$	1,171	$	1,193
	Total derivatives	$	80,289		$	1,281		$	1,239			$	81,870			$	1,215	$	1,254
	_________
	-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.
Schedule Of Effect Of Derivative Instruments On Statements Of Operations	The following tables present the effect of hedging derivative instruments on the consolidated statements of income:
		Gain or (Loss) Recognized in Income on Derivatives						Location of Amounts Recognized in Income on Derivatives and Related Hedged Item		Gain or (Loss) Recognized in Income on Related Hedged Item
		Three Months Ended March 31								Three Months Ended March 31
		2015			2014					2015				2014
		(In millions)								(In millions)
	Fair Value Hedges:
	Interest rate swaps on:
	Debt/CDs	$	4		$	9		Interest expense		$	4			$	2
	Debt/CDs	7			(8		)	Other non-interest expense		(7		)		9
	Securities available for sale	(4		)	(4		)	Interest income		—				—
	Securities available for sale	(20		)	(18		)	Other non-interest expense		19				14
	Total	$	(13	)	$	(21	)			$	16			$	25
		Effective Portion(3)
		Gain or (Loss) Recognized in AOCI(1)						Location of Amounts Reclassified from AOCI into Income		Gain or (Loss) Reclassified from AOCI into Income(2)
		Three Months Ended March 31								Three Months Ended March 31
		2015			2014					2015				2014
		(In millions)								(In millions)
	Cash Flow Hedges:
	Interest rate swaps	$	37		$	4		Interest income on loans		$	33			$	31
	Forward starting swaps	—			2			Interest expense on debt		—				(3		)
	Total	$	37		$	6				$	33			$	28
	______
	(1) After-tax
	(2) Pre-tax
	(3) All cash flow hedges were highly effective for all periods presented, and the change in fair value attributed to hedge ineffectiveness was not material.
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, 2015 and 2014:
		Three Months Ended March 31
	Derivatives Not Designated as Hedging Instruments	2015			2014
		(In millions)
	Capital markets fee income and other(1):
	Interest rate swaps	$	4		$	2
	Interest rate options	—			—
	Interest rate futures and forward commitments	(1		)	—
	Other contracts	4			2
	Total capital markets fee income and other	7			4
	Mortgage income:
	Interest rate swaps	13			8
	Interest rate options	7			3
	Interest rate futures and forward commitments	4			(4		)
	Total mortgage income	24			7
		$	31		$	11
	______
	(1) Capital markets fee income and other is included in Other income on the consolidated statements of income.
Schedule Of Gross Derivative Positions, Including Collateral Posted or Received	The following table presents the Company's gross derivative positions, including collateral posted or received, as of March 31, 2015 and December 31, 2014.
		Offsetting Derivative Assets						Offsetting Derivative Liabilities
		31-Mar-15			December 31, 2014			31-Mar-15				December 31, 2014
		(In millions)
	Gross amounts subject to offsetting	$	1,180		$	1,157		$	1,143			$	1,195
	Gross amounts not subject to offsetting	101			58			96				59
	Gross amounts recognized	1,281			1,215			1,239				1,254
	Gross amounts offset in the consolidated balance sheets(1)	787			815			1,000				1,054
	Net amounts presented in the consolidated balance sheets	494			400			239				200
	Gross amounts not offset in the consolidated balance sheets:
	Financial instruments	8			8			28				—
	Cash collateral received/posted	—			—			23				29
	Net amounts	$	486		$	392		$	188			$	171
	________
	-1	At March 31, 2015, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $118 million and cash collateral posted of $330 million. At December 31, 2014, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $111 million and cash collateral posted of $354 million.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2015 and December 31, 2014:
		31-Mar-15													December 31, 2014
		Level 1			Level 2				Level 3			Total			Level 1				Level 2		Level 3			Total
												Estimated Fair Value												Estimated Fair Value
		(In millions)
	Recurring fair value measurements
	Trading account securities	$	107		$	—			$	—		$	107		$	106			$	—	$	—		$	106
	Securities available for sale:
	U.S. Treasury securities	$	180		$	—			$	—		$	180		$	176			$	—	$	—		$	176
	Federal agency securities	—			234				—			234			—				235		—			235
	Obligations of states and political subdivisions	—			2				—			2			—				2		—			2
	Mortgage-backed securities (MBS):
	Residential agency	—			16,153				—			16,153			—				16,038		—			16,038
	Residential non-agency	—			—				7			7			—				—		8			8
	Commercial agency	—			1,990				—			1,990			—				1,964		—			1,964
	Commercial non-agency	—			1,556				—			1,556			—				1,494		—			1,494
	Corporate and other debt securities	—			2,071				3			2,074			—				1,987		3			1,990
	Equity securities(1)	179			—				—			179			146				—		—			146
	Total securities available for sale	$	359		$	22,006			$	10		$	22,375		$	322			$	21,720	$	11		$	22,053
	Mortgage loans held for sale	$	—		$	396			$	—		$	396		$	—			$	440	$	—		$	440
	Residential mortgage servicing rights	$	—		$	—			$	239		$	239		$	—			$	—	$	257		$	257
	Derivative assets:
	Interest rate swaps	$	—		$	1,045			$	—		$	1,045		$	—			$	985	$	—		$	985
	Interest rate options	—			1				14			15			—				2		8			10
	Interest rate futures and forward commitments	—			8				—			8			—				3		—			3
	Other contracts	—			213				—			213			—				217		—			217
	Total derivative assets	$	—		$	1,267			$	14		$	1,281		$	—			$	1,207	$	8		$	1,215
	Derivative liabilities:
	Interest rate swaps	$	—		$	1,024			$	—		$	1,024		$	—			$	1,033	$	—		$	1,033
	Interest rate options	—			1				—			1			—				2		—			2
	Interest rate futures and forward commitments	—			8				—			8			—				8		—			8
	Other contracts	—			206				—			206			—				211		—			211
	Total derivative liabilities	$	—		$	1,239			$	—		$	1,239		$	—			$	1,254	$	—		$	1,254
	Nonrecurring fair value measurements
	Loans held for sale	$	—		$	—			$	14		$	14		$	—			$	—	$	33		$	33
	Foreclosed property and other real estate	—			35				33			68			—				41		8			49
	_______
	(1) Excludes Federal Reserve Bank and Federal Home Loan Bank Stock totaling $488 million and $16 million at March 31, 2015 and $488 million and $39 million at December 31, 2014, respectively.
Rollforward For Assets And Liabilities Measured At Fair Value On A Recurring Basis With Level 3 Significant Unobservable Inputs	The following tables illustrate a rollforward for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2015 and 2014. The tables do not reflect the change in fair value attributable to any related economic hedges the Company used to mitigate the interest rate risk associated with these assets and liabilities. The net changes in realized gains (losses) included in earnings related to Level 3 assets and liabilities held at March 31, 2015 and 2014 are not material.
		Three Months Ended March 31, 2015
		Opening			Total Realized /						Purchases		Sales	Issuances			Settlements			Transfers	Transfers		Closing
		Balance January 1,			Unrealized															into	out of		Balance March 31, 2015
		2015			Gains or Losses															Level 3	Level 3
					Included			Included
					in			in Other
					Earnings			Compre-
								hensive
								Income
								(Loss)
		(In millions)
	Level 3 Instruments Only
	Securities available for sale:
	Residential non-agency MBS	$	8		—			—			—		—	—			(1	)		—	—		$	7
	Corporate and other debt securities	3			—			—			—		—	—			—			—	—		3
	Total securities available for sale	$	11		—			—			—		—	—			(1	)		—	—		$	10
	Residential mortgage servicing rights	$	257		(25	)	(1)	—			7		—	—			—			—	—		$	239
	Total interest rate options derivatives, net	$	8		28		(1)	—			—		—	—			(22	)		—	—		$	14
		Three Months Ended March 31, 2014
		Opening			Total Realized /						Purchases		Sales	Issuances			Settlements			Transfers	Transfers		Closing
		Balance			Unrealized															into	out of		Balance
		January 1,			Gains or Losses															Level 3	Level 3		March 31,
		2014			Included			Included															2014
					in Earnings			in Other
								Compre-
								hensive
								Income
								(Loss)
		(In millions)
	Level 3 Instruments Only
	Securities available for sale:
	Residential non-agency MBS	$	9		—			—			—		—	—			—			—	—		$	9
	Corporate and other debt securities	2			—			—			3		—	—			(2	)		—	—		3
	Total securities available for sale	$	11		—			—			3		—	—			(2	)		—	—		$	12
	Residential mortgage servicing rights	$	297		(17	)	(1)	—			8		—	—			—			—	—		$	288
	Total interest rate options derivatives, net	$	5		21		(1)	—			—		—	—			(18	)		—	—		$	8
	_________
	(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
		2015			2014
		(In millions)
	Loans held for sale	$	(7	)	$	(15	)
	Foreclosed property and other real estate	(7		)	(7		)
Summary Of Quantitative Information About Level 3 Measurements	The following tables present detailed information regarding assets and liabilities measured at fair value using significant unobservable inputs (Level 3) as of March 31, 2015 and December 31, 2014. 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, 2015 and December 31, 2014 are included. Following the tables are a description of the valuation technique and the sensitivity of the technique to changes in the significant unobservable input.
		31-Mar-15
		Level 3		Valuation	Unobservable		Quantitative Range of
		Estimated Fair Value at		Technique	Input(s)		Unobservable Inputs and
		31-Mar-15					(Weighted-Average)
		(Dollars in millions)
	Recurring fair value measurements:
	Securities available for sale:
	Residential non-agency MBS	$7		Discounted cash flow	Spread to LIBOR		5.3% - 49.8% (14.6%)
					Weighted-average prepayment speed (CPR; percentage)		5.5% - 14.2% (9.4%)
					Probability of default		1.40%
					Loss severity		40.20%
	Corporate and other debt securities	$3		Market comparable	Evaluated quote on same issuer/comparable bond		99.90%
	Residential mortgage servicing rights(1)	$239		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		11.9% - 14.0% (12.7%)
					Option-adjusted spread (percentage)		8.7% - 17.4% (10.1%)
	Derivative assets:
	Interest rate options	$14		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		11.9% - 14.0% (12.7%)
					Option-adjusted spread (percentage)		8.7% - 17.4% (10.1%)
					Pull-through		20.3% - 99.1% (86.9%)
	Nonrecurring fair value measurements:
	Loans held for sale	$14		Commercial loans held for sale are valued based on multiple data points, including discount to appraised value of collateral based on recent market activity for sales of similar loans	Appraisal comparability adjustment (discount)		27.3% - 99.9% (63.7%)
	Foreclosed property and other real estate	$33		Discount to appraised value of property based on recent market activity for sales of similar properties	Appraisal comparability adjustment (discount)		25.0% - 61.7% (28.2%)
	_________
	(1) See Note 5 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
		December 31, 2014
		Level 3		Valuation	Unobservable		Quantitative Range of
		Estimated Fair Value at		Technique	Input(s)		Unobservable Inputs and
		December 31, 2014					(Weighted-Average)
		(Dollars in millions)
	Recurring fair value measurements:
	Securities available for sale:
	Residential non-agency MBS	$8		Discounted cash flow	Spread to LIBOR		5.4% - 49.9% (12.3%)
					Weighted-average prepayment speed (CPR; percentage)		6.3% - 15.0% (9.5%)
					Probability of default		1.40%
					Loss severity		37.40%
	Corporate and other debt securities	$3		Market comparable	Evaluated quote on same issuer/comparable bond		99.90%
	Residential mortgage servicing rights(1)	$257		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		9.9% - 22.4% (12.0%)
					Option-adjusted spread (percentage)		7.7% - 11.3% (9.0%)
	Derivative assets:
	Interest rate options	$8		Discounted cash flow	Weighted-average prepayment speed (CPR; percentage)		9.9% - 22.4% (12.0%)
					Option-adjusted spread (percentage)		7.7% - 11.3% (9.0%)
					Pull-through		7.3% - 99.1% (87.8%)
	Nonrecurring fair value measurements:
	Loans held for sale	$33		Commercial loans held for sale are valued based on multiple data points, including discount to appraised value of collateral based on recent market activity for sales of similar loans	Appraisal comparability adjustment (discount)		8.3% - 90.9% (53.3%)
	Foreclosed property and other real estate	$8		Discount to appraised value of property based on recent market activity for sales of similar properties	Appraisal comparability adjustment (discount)		3.7% - 73.0% (29.6%)
	_________
	(1) See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2014 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
Summary Of Difference Between Aggregate Fair Value And Aggregate Unpaid Principal Balance For Mortgage Loans Held For Sale Measured At Fair Value	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:
		31-Mar-15										December 31, 2014
		Aggregate			Aggregate				Aggregate Fair			Aggregate		Aggregate				Aggregate Fair
		Fair Value			Unpaid				Value Less			Fair Value		Unpaid				Value Less
					Principal				Aggregate					Principal				Aggregate
									Unpaid									Unpaid
									Principal									Principal
		(In millions)
	Mortgage loans held for sale, at fair value	$	396		$	381			$	15		$	440	$	421			$	19
Summary Of Net Gains (Losses) From Changes In Fair Value	The following table details net gains 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, 2015 and 2014, respectively. 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.
		Mortgage loans held for sale, at fair value
		Three Months Ended March 31
		2015			2014
		(In millions)
	Net gains (losses) resulting from changes in fair value	$	(4	)	$	6
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, 2015 are as follows:
		31-Mar-15
		Carrying			Estimated				Level 1			Level 2		Level 3
		Amount			Fair
					Value(1)
		(In millions)
	Financial assets:
	Cash and cash equivalents	$	6,026		$	6,026			$	6,026		$	—	$	—
	Trading account securities	107			107				107			—		—
	Securities held to maturity	2,129			2,186				1			2,185		—
	Securities available for sale	22,879			22,879				359			22,510		10
	Loans held for sale	491			491				—			396		95
	Loans (excluding leases), net of unearned income and allowance for loan losses(2)(3)	75,324			71,683				—			—		71,683
	Other interest-earning assets	83			83				—			83		—
	Derivative assets	1,281			1,281				—			1,267		14
	Financial liabilities:
	Derivative liabilities	1,239			1,239				—			1,239		—
	Deposits	97,477			97,469				—			97,469		—
	Short-term borrowings	2,085			2,085				—			2,085		—
	Long-term borrowings	3,208			3,860				—			2,869		991
	Loan commitments and letters of credit	104			544				—			—		544
	Indemnification obligation	204			188				—			—		188
	_________
	-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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.
	-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 at March 31, 2015 was $3.6 billion or 4.8 percent.
	-3	Excluded from this table is the lease carrying amount of $1.8 billion at March 31, 2015.
	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, 2014 are as follows:
		December 31, 2014
		Carrying			Estimated				Level 1			Level 2		Level 3
		Amount			Fair
					Value(1)
		(In millions)
	Financial assets:
	Cash and cash equivalents	$	4,004		$	4,004			$	4,004		$	—	$	—
	Trading account securities	106			106				106			—		—
	Securities held to maturity	2,175			2,209				1			2,208		—
	Securities available for sale	22,580			22,580				322			22,247		11
	Loans held for sale	541			541				—			440		101
	Loans (excluding leases), net of unearned income and allowance for loan losses(2)(3)	74,482			70,114				—			—		70,114
	Other interest-earning assets	89			89				—			89		—
	Derivative assets	1,215			1,215				—			1,207		8
	Financial liabilities:
	Derivative liabilities	1,254			1,254				—			1,254		—
	Deposits	94,200			94,186				—			94,186		—
	Short-term borrowings	2,253			2,253				—			2,253		—
	Long-term borrowings	3,462			3,871				—			3,504		367
	Loan commitments and letters of credit	106			539				—			—		539
	Indemnification obligation	206			198				—			—		198
	_________
	-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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.
	-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 at December 31, 2014 was $4.4 billion or 5.9 percent.
	-3	Excluded from this table is the lease carrying amount of $1.7 billion at December 31, 2014.

Business_Segment_Information_T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2015
		Corporate Bank		Consumer		Wealth		Other			Continuing		Discontinued			Consolidated
				Bank		Management					Operations		Operations
		(In millions)
	Net interest income (loss)	$	280	$	601	$	42	$	(108	)	$	815	$	—		$	815
	Provision (credit) for loan losses	—		53		2		(6		)	49		—			49
	Non-interest income	90		265		99		16			470		—			470
	Non-interest expense	153		589		105		58			905		4			909
	Income (loss) before income taxes	217		224		34		(144		)	331		(4		)	327
	Income tax expense (benefit)	82		85		13		(85		)	95		(2		)	93
	Net income (loss)	$	135	$	139	$	21	$	(59	)	$	236	$	(2	)	$	234
	Average assets	$	45,150	$	37,993	$	2,912	$	34,511		$	120,566	$	—		$	120,566
		Three Months Ended March 31, 2014
		Corporate Bank		Consumer Bank		Wealth		Other			Continuing		Discontinued			Consolidated
						Management					Operations		Operations
		(In millions)
	Net interest income (loss)	$	283	$	611	$	43	$	(121	)	$	816	$	—		$	816
	Provision (credit) for loan losses	—		81		1		(80		)	2		—			2
	Non-interest income	75		275		92		15			457		—			457
	Non-interest expense	136		563		100		18			817		(19		)	798
	Income (loss) before income taxes	222		242		34		(44		)	454		19			473
	Income tax expense (benefit)	84		92		13		(38		)	151		7			158
	Net income (loss)	$	138	$	150	$	21	$	(6	)	$	303	$	12		$	315
	Average assets	$	42,515	$	38,728	$	2,959	$	33,515		$	117,717	$	—		$	117,717

Commitments_Contingencies_and_1

Commitments, Contingencies and Guarantees (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2015		31-Dec-14
		(In millions)
	Unused commitments to extend credit	$	44,642	$	43,724
	Standby letters of credit	1,629		1,697
	Commercial letters of credit	41		71
	Liabilities associated with standby letters of credit	38		40
	Assets associated with standby letters of credit	38		40
	Reserve for unfunded credit commitments	66		65

Basis_of_Presentation_Narrativ

Basis of Presentation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to other interest-earning assets	$83		$89
Cumulative effect adjustment to other assets	5,773		6,013
Amortization recognized for low income housing tax credits associated with adoption of ASU 2014-01	25	22
Tax credits recognized for low income housing tax credits associated with adoption of ASU 2014-01	29	26
Other tax benefits recognized for low income housing tax credits associated with adoption of ASU 2014-01	6	6
Low Income Housing Tax Credit Investments [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity Investments	861		818
Cumulative effect of adopting ASU 2014-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to other interest-earning assets			22
Cumulative effect adjustment to other assets			-138
Equity [Member] | Cumulative effect of adopting ASU 2014-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings			($116)

Discontinued_Operations_Schedu

Discontinued Operations (Schedule of Discontinued Operations Income Statement) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Non-interest expense:
Total non-interest expense	$905		$817
Income (loss) from discontinued operations before income taxes	-4		19
Income tax expense (benefit)	-2		7
Income (loss) from discontinued operations, net of tax	-2		12
Earning (Loss) Per Common Share From Discontinued Operations [Abstract]
Basic (in dollars per share)	$0	[1]	$0.01	[1]
Diluted (in dollars per share)	$0	[1]	$0.01	[1]
Discontinued Operations [Member]
Non-interest expense:
Professional and legal expenses	4		-19
Total non-interest expense	4		-19
Income (loss) from discontinued operations before income taxes	-4		19
Income tax expense (benefit)	-2		7
Income (loss) from discontinued operations, net of tax	($2)		$12
Earning (Loss) Per Common Share From Discontinued Operations [Abstract]
Basic (in dollars per share)	$0		$0.01
Diluted (in dollars per share)	$0		$0.01
[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 $)	Mar. 31, 2015		Dec. 31, 2014		Jun. 30, 2013
In Millions, unless otherwise specified
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Held To Maturity Amortized Cost Basis	$2,216		$2,265
Held To Maturity Securities Gross Unrealized Gains	0	[1]	0	[1]
Held To Maturity Securities Gross Unrealized Losses	-87	[1]	-90	[1]	-111
Held-to-maturity Securities	2,129		2,175
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	59		41
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2		-7
Securities held to maturity, estimated fair value	2,186		2,209
Amortized Cost - Securities available for sale	22,471		22,296
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	450		362
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-42		-78
Available-for-sale securities, net carrying value	22,879		22,580
Available-for-sale Securities	22,879		22,580
US Treasury Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Held To Maturity Amortized Cost Basis	1		1
Held To Maturity Securities Gross Unrealized Gains	0	[1]	0	[1]
Held To Maturity Securities Gross Unrealized Losses	0	[1]	0	[1]
Held-to-maturity Securities	1		1
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0		0
Securities held to maturity, estimated fair value	1		1
Amortized Cost - Securities available for sale	178		176
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale securities, net carrying value	180		176
Available-for-sale Securities	180		176
Federal Agency Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Held To Maturity Amortized Cost Basis	350		350
Held To Maturity Securities Gross Unrealized Gains	0	[1]	0	[1]
Held To Maturity Securities Gross Unrealized Losses	-12	[1]	-12	[1]
Held-to-maturity Securities	338		338
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	10		6
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0		0
Securities held to maturity, estimated fair value	348		344
Amortized Cost - Securities available for sale	230		233
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4		2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale securities, net carrying value	234		235
Available-for-sale Securities	234		235
Obligations of States and Political Subdivisions [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost - Securities available for sale	2		2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale securities, net carrying value	2		2
Available-for-sale Securities	2		2
Residential Agency [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Held To Maturity Amortized Cost Basis	1,655		1,698
Held To Maturity Securities Gross Unrealized Gains	0	[1]	0	[1]
Held To Maturity Securities Gross Unrealized Losses	-69	[1]	-71	[1]
Held-to-maturity Securities	1,586		1,627
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	49		35
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0		-1
Securities held to maturity, estimated fair value	1,635		1,661
Amortized Cost - Securities available for sale	15,838		15,788
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	329		283
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-14		-33
Available-for-sale securities, net carrying value	16,153		16,038
Available-for-sale Securities	16,153		16,038
Residential Non Agency [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost - Securities available for sale	7		7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0		1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale securities, net carrying value	7		8
Available-for-sale Securities	7		8
Commercial Agency [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Held To Maturity Amortized Cost Basis	210		216
Held To Maturity Securities Gross Unrealized Gains	0	[1]	0	[1]
Held To Maturity Securities Gross Unrealized Losses	-6	[1]	-7	[1]
Held-to-maturity Securities	204		209
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0		0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2		-6
Securities held to maturity, estimated fair value	202		203
Amortized Cost - Securities available for sale	1,964		1,959
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	29		14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-3		-9
Available-for-sale securities, net carrying value	1,990		1,964
Available-for-sale Securities	1,990		1,964
Commercial Non Agency [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost - Securities available for sale	1,535		1,489
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	23		14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-2		-9
Available-for-sale securities, net carrying value	1,556		1,494
Available-for-sale Securities	1,556		1,494
Corporate and Other Debt Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost - Securities available for sale	2,047		1,980
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	50		36
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-23		-26
Available-for-sale securities, net carrying value	2,074		1,990
Available-for-sale Securities	2,074		1,990
Equity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost - Securities available for sale	670		662
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	13		12
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		-1
Available-for-sale securities, net carrying value	683		673
Available-for-sale Securities	$683		$673
[1]	The gross unrealized losses recognized in other comprehensive income (OCI) on held to maturity securities resulted from a transfer of available for sale securities to held to maturity in the second quarter of 2013.

Securities_Schedule_Of_Amortiz1

Securities (Schedule Of Amortized Cost Of Equity Securities Related To Federal Reserve Bank Stock And Federal Home Loan Bank Stock) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Federal Reserve Bank Stock	$488	$488
Federal Home Loan Bank Stock	$16	$39

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 $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Held To Maturity Amortized Cost Basis	$2,216	$2,265
Securities held to maturity, estimated fair value	2,186	2,209
Amortized Cost - Securities available for sale	22,471	22,296
Fair Value - Securities available for sale	22,879	22,580
Held-to-maturity Securities [Member]
Held-to-maturity, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity, Debt Maturities, Next Twelve Months, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	1
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	1
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	350
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	348
Available-for-sale Securities [Member]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	105
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	105
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	975
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	998
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	1,042
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	1,051
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	335
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	336
Residential Agency [Member]
Held To Maturity Amortized Cost Basis	1,655	1,698
Securities held to maturity, estimated fair value	1,635	1,661
Amortized Cost - Securities available for sale	15,838	15,788
Fair Value - Securities available for sale	16,153	16,038
Residential Non Agency [Member]
Amortized Cost - Securities available for sale	7	7
Fair Value - Securities available for sale	7	8
Commercial Agency [Member]
Held To Maturity Amortized Cost Basis	210	216
Securities held to maturity, estimated fair value	202	203
Amortized Cost - Securities available for sale	1,964	1,959
Fair Value - Securities available for sale	1,990	1,964
Commercial Non Agency [Member]
Amortized Cost - Securities available for sale	1,535	1,489
Fair Value - Securities available for sale	1,556	1,494
Equity Securities [Member]
Amortized Cost - Securities available for sale	670	662
Fair Value - Securities available for sale	$683	$673

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 $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Unrealized Loss And Fair Value On Securities [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value	$438	$0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-2	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	1,668	2,206
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-28	-56
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	2,106	2,206
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	-30	-56
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,129	2,358
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-16	-17
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,738	3,864
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-26	-61
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,867	6,222
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	-42	-78
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, Fair Value	11	74
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11	77
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Federal Agency Securities [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	149	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-1	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	199	344
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-1	-6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	348	344
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	-2	-6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6	3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
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	289	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-1	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value	1,267	1,659
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-19	-37
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	1,556	1,659
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	-20	-37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,318	1,178
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-5	-5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	978	2,587
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-9	-28
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,296	3,765
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	-14	-33
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	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	202	203
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-8	-13
Held-to-maturity Securities, Continuous Unrealized Loss Position, Estimated Fair Value	202	203
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	-8	-13
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	415	464
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-2	-4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	247	316
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-1	-5
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	662	780
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	-3	-9
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, Fair Value	62	242
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-1	-1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	240	500
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-1	-8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	302	742
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	-2	-9
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, Fair Value	323	400
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-8	-7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	267	455
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	-15	-20
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	590	855
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	($23)	($27)

Securities_Schedule_Of_Gross_R

Securities (Schedule Of Gross Realized Gains And Gross Realized Losses On Available For Sale Securities) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$5	$3
Gross realized losses	0	-1
Net securities gains (losses)	$5	$2

Securities_Narrative_Details

Securities (Narrative) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Jun. 30, 2013
	Security		Security
Schedule of Available-for-sale Securities [Line Items]
Held To Maturity Securities Gross Unrealized Losses Recognized in Other Comprehensive Income	$87,000,000	[1]	$90,000,000	[1]	$111,000,000
available for sale securities transferred to held to maturity					2,400,000,000
Securities pledged to secure public funds, trust deposits and borrowing arrangements	13,100,000,000		12,100,000,000
Securities in unrealized loss position number	511		827
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held To Maturity Securities Gross Unrealized Losses Recognized in Other Comprehensive Income	0	[1]	0	[1]
Securities Pledged as Collateral [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	$28,000,000
[1]	The gross unrealized losses recognized in other comprehensive income (OCI) on held to maturity securities resulted from a transfer of available for sale securities to held to maturity in the second quarter of 2013.

Loans_and_the_Allowance_for_Cr2

Loans and the Allowance for Credit Losses (Schedule Of Loan Portfolio, Net Of Unearned Income) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$78,243	$77,307	$75,680
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	33,681	32,732
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,043	8,263
Commercial Real Estate Construction - Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	437	407
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	42,161	41,402	40,098
Commercial Investor Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	4,499	4,680
Commercial Investor Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,422	2,133
Total Investor Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	6,921	6,813	6,992
Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	12,418	12,315
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	10,854	10,932
Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,701	3,642
Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	966	1,009
Consumer Other Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,222	1,194
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$29,161	$29,092	$28,590

Loans_and_the_Allowance_for_Cr3

Loans and the Allowance for Credit Losses (Analysis of the Allowance for Credit Losses by Portfolio Segment) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	$1,103	$1,341
Provision (credit) for loan and lease losses	49	2
Charge-offs	-101	-124
Recoveries	47	42
Net loan losses	-54	-82
Allowance for loan losses, end of period	1,098	1,261
Reserve For Unfunded Credit Commitments, beginning of period	65	78
Provision (credit) for unfunded credit losses	1	0
Reserve For Unfunded Credit Commitments, end of period	66	78
Allowance for Credit Losses, end of period	1,164	1,339
Allowance Individually Evaluated for Impairment	300	411
Allowance Collectively Evaluated for Impairment	798	850
Loans Individually Evaluated for Impairment	1,943	2,551
Loans Collectively Evaluated for Impairment	76,300	73,129
Loans, net of unearned income	78,243	75,680	77,307
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	654	711
Provision (credit) for loan and lease losses	59	5
Charge-offs	-34	-41
Recoveries	17	17
Net loan losses	-17	-24
Allowance for loan losses, end of period	696	692
Reserve For Unfunded Credit Commitments, beginning of period	57	63
Provision (credit) for unfunded credit losses	1	0
Reserve For Unfunded Credit Commitments, end of period	58	63
Allowance for Credit Losses, end of period	754	755
Allowance Individually Evaluated for Impairment	178	223
Allowance Collectively Evaluated for Impairment	518	469
Loans Individually Evaluated for Impairment	766	1,006
Loans Collectively Evaluated for Impairment	41,395	39,092
Loans, net of unearned income	42,161	40,098	41,402
Total Investor Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	150	236
Provision (credit) for loan and lease losses	-25	-27
Charge-offs	-8	-9
Recoveries	8	8
Net loan losses	0	-1
Allowance for loan losses, end of period	125	208
Reserve For Unfunded Credit Commitments, beginning of period	8	12
Provision (credit) for unfunded credit losses	0	-1
Reserve For Unfunded Credit Commitments, end of period	8	11
Allowance for Credit Losses, end of period	133	219
Allowance Individually Evaluated for Impairment	49	98
Allowance Collectively Evaluated for Impairment	76	110
Loans Individually Evaluated for Impairment	320	676
Loans Collectively Evaluated for Impairment	6,601	6,316
Loans, net of unearned income	6,921	6,992	6,813
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses, beginning of period	299	394
Provision (credit) for loan and lease losses	15	24
Charge-offs	-59	-74
Recoveries	22	17
Net loan losses	-37	-57
Allowance for loan losses, end of period	277	361
Reserve For Unfunded Credit Commitments, beginning of period	0	3
Provision (credit) for unfunded credit losses	0	1
Reserve For Unfunded Credit Commitments, end of period	0	4
Allowance for Credit Losses, end of period	277	365
Allowance Individually Evaluated for Impairment	73	90
Allowance Collectively Evaluated for Impairment	204	271
Loans Individually Evaluated for Impairment	857	869
Loans Collectively Evaluated for Impairment	28,304	27,721
Loans, net of unearned income	$29,161	$28,590	$29,092

Loans_and_the_Allowance_for_Cr4

Loans and the Allowance for Credit Losses (Credit Quality Indicators) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$78,243	$77,307	$75,680
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	33,681	32,732
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	8,043	8,263
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	437	407
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	42,161	41,402	40,098
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,499	4,680
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,422	2,133
Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	6,921	6,813	6,992
Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	12,418	12,315
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	10,854	10,932
Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,701	3,642
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	966	1,009
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,222	1,194
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	29,161	29,092	28,590
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	32,185	31,492
Pass [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	7,207	7,425
Pass [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	405	387
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	39,797	39,304
Pass [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,096	4,152
Pass [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,365	2,060
Pass [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	6,461	6,212
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	600	626
Special Mention [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	311	315
Special Mention [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	15	9
Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	926	950
Special Mention [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	150	234
Special Mention [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	21	22
Special Mention [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	171	256
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	598	362
Substandard [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	309	285
Substandard [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	14	8
Substandard [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	921	655
Substandard [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	168	171
Substandard [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	36	49
Substandard [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	204	220
Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	12,317	12,206
Accrual [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	10,757	10,830
Accrual [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3,701	3,642
Accrual [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	966	1,009
Accrual [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,222	1,194
Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	28,963	28,881
Non Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	298	252
Non Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	216	238
Non Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	3	3
Non Accrual [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	517	493
Non Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	85	123
Non Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	2
Non Accrual [Member] | Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	85	125
Non Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	101	109
Non Accrual [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	97	102
Non Accrual [Member] | Indirect [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] | Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0
Non Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$198	$211

Loans_and_the_Allowance_for_Cr5

Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	$249	$291
60-89 DPD, Accrual Loans	113	144
90 plus DPD, Accrual Loans	327	347
Total 30 plus DPD, Accrual Loans	689	782
Total Accrual	77,443	76,478
Nonaccrual	800	829
Loans, net of unearned income	78,243	77,307	75,680
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	17	16
60-89 DPD, Accrual Loans	10	7
90 plus DPD, Accrual Loans	4	7
Total 30 plus DPD, Accrual Loans	31	30
Total Accrual	33,383	32,480
Nonaccrual	298	252
Loans, net of unearned income	33,681	32,732
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	24	21
60-89 DPD, Accrual Loans	6	13
90 plus DPD, Accrual Loans	7	5
Total 30 plus DPD, Accrual Loans	37	39
Total Accrual	7,827	8,025
Nonaccrual	216	238
Loans, net of unearned income	8,043	8,263
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	0	1
60-89 DPD, Accrual Loans	0	0
90 plus DPD, Accrual Loans	0	0
Total 30 plus DPD, Accrual Loans	0	1
Total Accrual	434	404
Nonaccrual	3	3
Loans, net of unearned income	437	407
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	41	38
60-89 DPD, Accrual Loans	16	20
90 plus DPD, Accrual Loans	11	12
Total 30 plus DPD, Accrual Loans	68	70
Total Accrual	41,644	40,909
Nonaccrual	517	493
Loans, net of unearned income	42,161	41,402	40,098
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	7	17
60-89 DPD, Accrual Loans	2	3
90 plus DPD, Accrual Loans	2	3
Total 30 plus DPD, Accrual Loans	11	23
Total Accrual	4,414	4,557
Nonaccrual	85	123
Loans, net of unearned income	4,499	4,680
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	4	0
60-89 DPD, Accrual Loans	0	0
90 plus DPD, Accrual Loans	0	0
Total 30 plus DPD, Accrual Loans	4	0
Total Accrual	2,422	2,131
Nonaccrual	0	2
Loans, net of unearned income	2,422	2,133
Total Investor Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	11	17
60-89 DPD, Accrual Loans	2	3
90 plus DPD, Accrual Loans	2	3
Total 30 plus DPD, Accrual Loans	15	23
Total Accrual	6,836	6,688
Nonaccrual	85	125
Loans, net of unearned income	6,921	6,813	6,992
Residential First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	84	99
60-89 DPD, Accrual Loans	43	64
90 plus DPD, Accrual Loans	225	247
Total 30 plus DPD, Accrual Loans	352	410
Total Accrual	12,317	12,206
Nonaccrual	101	109
Loans, net of unearned income	12,418	12,315
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	64	73
60-89 DPD, Accrual Loans	37	38
90 plus DPD, Accrual Loans	67	63
Total 30 plus DPD, Accrual Loans	168	174
Total Accrual	10,757	10,830
Nonaccrual	97	102
Loans, net of unearned income	10,854	10,932
Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	34	43
60-89 DPD, Accrual Loans	7	10
90 plus DPD, Accrual Loans	6	7
Total 30 plus DPD, Accrual Loans	47	60
Total Accrual	3,701	3,642
Nonaccrual	0	0
Loans, net of unearned income	3,701	3,642
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	6	8
60-89 DPD, Accrual Loans	5	5
90 plus DPD, Accrual Loans	12	12
Total 30 plus DPD, Accrual Loans	23	25
Total Accrual	966	1,009
Nonaccrual	0	0
Loans, net of unearned income	966	1,009
Consumer Other Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	9	13
60-89 DPD, Accrual Loans	3	4
90 plus DPD, Accrual Loans	4	3
Total 30 plus DPD, Accrual Loans	16	20
Total Accrual	1,222	1,194
Nonaccrual	0	0
Loans, net of unearned income	1,222	1,194
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 DPD, Accrual Loans	197	236
60-89 DPD, Accrual Loans	95	121
90 plus DPD, Accrual Loans	314	332
Total 30 plus DPD, Accrual Loans	606	689
Total Accrual	28,963	28,881
Nonaccrual	198	211
Loans, net of unearned income	$29,161	$29,092	$28,590

Loans_and_the_Allowance_for_Cr6

Loans and the Allowance for Credit Losses (Impaired Financing Receivables) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$2,107	[1]		$2,191	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	164	[2]		176	[2]
Impaired Financing Receivable, Recorded Investment	1,943	[3]		2,015	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	96	[3]		80	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,847	[3]		1,935	[3]
Impaired Financing Receivable, Related Allowance	300			329
Impaired Financing Receivable, Coverage Percentage	22.00%	[4]		23.00%	[4]
Impaired Financing Receivable, Average Recorded Investment	1,962		2,597
Impaired Financing Receivable, Interest Income Recognized	17		25
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	437	[1]		388	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	37	[2]		39	[2]
Impaired Financing Receivable, Recorded Investment	400	[3]		349	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	39	[3]		11	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	361	[3]		338	[3]
Impaired Financing Receivable, Related Allowance	96			100
Impaired Financing Receivable, Coverage Percentage	30.40%	[4]		35.80%	[4]
Impaired Financing Receivable, Average Recorded Investment	359		467
Impaired Financing Receivable, Interest Income Recognized	1		3
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	396	[1]		429	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	33	[2]		39	[2]
Impaired Financing Receivable, Recorded Investment	363	[3]		390	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	39	[3]		43	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	324	[3]		347	[3]
Impaired Financing Receivable, Related Allowance	80			85
Impaired Financing Receivable, Coverage Percentage	28.50%	[4]		28.90%	[4]
Impaired Financing Receivable, Average Recorded Investment	379		511
Impaired Financing Receivable, Interest Income Recognized	3		4
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	4	[1]		3	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	1	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	3	[3]		3	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3	[3]		3	[3]
Impaired Financing Receivable, Related Allowance	2			1
Impaired Financing Receivable, Coverage Percentage	75.00%	[4]		33.30%	[4]
Impaired Financing Receivable, Average Recorded Investment	3		41
Impaired Financing Receivable, Interest Income Recognized	0		0
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	837	[1]		820	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	71	[2]		78	[2]
Impaired Financing Receivable, Recorded Investment	766	[3]		742	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	78	[3]		54	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	688	[3]		688	[3]
Impaired Financing Receivable, Related Allowance	178			186
Impaired Financing Receivable, Coverage Percentage	29.70%	[4]		32.20%	[4]
Impaired Financing Receivable, Average Recorded Investment	741		1,019
Impaired Financing Receivable, Interest Income Recognized	4		7
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	333	[1]		429	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	45	[2]		47	[2]
Impaired Financing Receivable, Recorded Investment	288	[3]		382	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18	[3]		26	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	270	[3]		356	[3]
Impaired Financing Receivable, Related Allowance	43			58
Impaired Financing Receivable, Coverage Percentage	26.40%	[4]		24.50%	[4]
Impaired Financing Receivable, Average Recorded Investment	331		620
Impaired Financing Receivable, Interest Income Recognized	3		8
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	33	[1]		36	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	1	[2]		1	[2]
Impaired Financing Receivable, Recorded Investment	32	[3]		35	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	32	[3]		35	[3]
Impaired Financing Receivable, Related Allowance	6			7
Impaired Financing Receivable, Coverage Percentage	21.20%	[4]		22.20%	[4]
Impaired Financing Receivable, Average Recorded Investment	33		87
Impaired Financing Receivable, Interest Income Recognized	1		1
Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	366	[1]		465	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	46	[2]		48	[2]
Impaired Financing Receivable, Recorded Investment	320	[3]		417	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18	[3]		26	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	302	[3]		391	[3]
Impaired Financing Receivable, Related Allowance	49			65
Impaired Financing Receivable, Coverage Percentage	26.00%	[4]		24.30%	[4]
Impaired Financing Receivable, Average Recorded Investment	364		707
Impaired Financing Receivable, Interest Income Recognized	4		9
Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	512	[1]		505	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	34	[2]		37	[2]
Impaired Financing Receivable, Recorded Investment	478	[3]		468	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	478	[3]		468	[3]
Impaired Financing Receivable, Related Allowance	62			64
Impaired Financing Receivable, Coverage Percentage	18.80%	[4]		20.00%	[4]
Impaired Financing Receivable, Average Recorded Investment	476		457
Impaired Financing Receivable, Interest Income Recognized	4		4
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	374	[1]		381	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	13	[2]		13	[2]
Impaired Financing Receivable, Recorded Investment	361	[3]		368	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	361	[3]		368	[3]
Impaired Financing Receivable, Related Allowance	11			14
Impaired Financing Receivable, Coverage Percentage	6.40%	[4]		7.10%	[4]
Impaired Financing Receivable, Average Recorded Investment	363		387
Impaired Financing Receivable, Interest Income Recognized	5		5
Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	1	[1]		1	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	1	[3]		1	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1	[3]		1	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Impaired Financing Receivable, Average Recorded Investment	1		1
Impaired Financing Receivable, Interest Income Recognized	0		0
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2	[1]		2	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	2	[3]		2	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2	[3]		2	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Impaired Financing Receivable, Average Recorded Investment	2		2
Impaired Financing Receivable, Interest Income Recognized	0		0
Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	15	[1]		17	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	15	[3]		17	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	15	[3]		17	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Impaired Financing Receivable, Average Recorded Investment	15		24
Impaired Financing Receivable, Interest Income Recognized	0		0
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	904	[1]		906	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	47	[2]		50	[2]
Impaired Financing Receivable, Recorded Investment	857	[3]		856	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	857	[3]		856	[3]
Impaired Financing Receivable, Related Allowance	73			78
Impaired Financing Receivable, Coverage Percentage	13.30%	[4]		14.10%	[4]
Impaired Financing Receivable, Average Recorded Investment	857		871
Impaired Financing Receivable, Interest Income Recognized	9		9
Accrual [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	1,315	[1]		1,369	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	36	[2]		38	[2]
Impaired Financing Receivable, Recorded Investment	1,279	[3]		1,331	[3]
Impaired Financing Receivable, Related Allowance	132			137
Impaired Financing Receivable, Coverage Percentage	12.80%	[4]		12.80%	[4]
Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	104	[1]		102	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	1	[2]		3	[2]
Impaired Financing Receivable, Recorded Investment	103	[3]		99	[3]
Impaired Financing Receivable, Related Allowance	19			17
Impaired Financing Receivable, Coverage Percentage	19.20%	[4]		19.60%	[4]
Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	157	[1]		162	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	10	[2]		10	[2]
Impaired Financing Receivable, Recorded Investment	147	[3]		152	[3]
Impaired Financing Receivable, Related Allowance	17			16
Impaired Financing Receivable, Coverage Percentage	17.20%	[4]		16.00%	[4]
Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	1	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	1	[2]
Impaired Financing Receivable, Recorded Investment	0	[3]
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Coverage Percentage	100.00%	[4]
Accrual [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	262	[1]		264	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	12	[2]		13	[2]
Impaired Financing Receivable, Recorded Investment	250	[3]		251	[3]
Impaired Financing Receivable, Related Allowance	36			33
Impaired Financing Receivable, Coverage Percentage	18.30%	[4]		17.40%	[4]
Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	211	[1]		267	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	8	[2]		8	[2]
Impaired Financing Receivable, Recorded Investment	203	[3]		259	[3]
Impaired Financing Receivable, Related Allowance	24			28
Impaired Financing Receivable, Coverage Percentage	15.20%	[4]		13.50%	[4]
Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	32	[1]		33	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	32	[3]		33	[3]
Impaired Financing Receivable, Related Allowance	6			6
Impaired Financing Receivable, Coverage Percentage	18.80%	[4]		18.20%	[4]
Accrual [Member] | Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	243	[1]		300	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	8	[2]		8	[2]
Impaired Financing Receivable, Recorded Investment	235	[3]		292	[3]
Impaired Financing Receivable, Related Allowance	30			34
Impaired Financing Receivable, Coverage Percentage	15.60%	[4]		14.00%	[4]
Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	439	[1]		426	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	10	[2]		11	[2]
Impaired Financing Receivable, Recorded Investment	429	[3]		415	[3]
Impaired Financing Receivable, Related Allowance	56			57
Impaired Financing Receivable, Coverage Percentage	15.00%	[4]		16.00%	[4]
Accrual [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	353	[1]		359	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	6	[2]		6	[2]
Impaired Financing Receivable, Recorded Investment	347	[3]		353	[3]
Impaired Financing Receivable, Related Allowance	10			13
Impaired Financing Receivable, Coverage Percentage	4.50%	[4]		5.30%	[4]
Accrual [Member] | Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	1	[1]		1	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	1	[3]		1	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Accrual [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2	[1]		2	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	2	[3]		2	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Accrual [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	15	[1]		17	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	15	[3]		17	[3]
Impaired Financing Receivable, Related Allowance	0			0
Impaired Financing Receivable, Coverage Percentage	0.00%	[4]		0.00%	[4]
Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	810	[1]		805	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	16	[2]		17	[2]
Impaired Financing Receivable, Recorded Investment	794	[3]		788	[3]
Impaired Financing Receivable, Related Allowance	66			70
Impaired Financing Receivable, Coverage Percentage	10.10%	[4]		10.80%	[4]
Non Accrual [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	792	[1]		822	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	128	[2]		138	[2]
Impaired Financing Receivable, Recorded Investment	664	[3]		684	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	96	[3]		80	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	568	[3]		604	[3]
Impaired Financing Receivable, Related Allowance	168			192
Impaired Financing Receivable, Coverage Percentage	37.40%	[4]		40.10%	[4]
Non Accrual [Member] | Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	333	[1]		286	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	36	[2]		36	[2]
Impaired Financing Receivable, Recorded Investment	297	[3]		250	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	39	[3]		11	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	258	[3]		239	[3]
Impaired Financing Receivable, Related Allowance	77			83
Impaired Financing Receivable, Coverage Percentage	33.90%	[4]		41.60%	[4]
Non Accrual [Member] | Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	239	[1]		267	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	23	[2]		29	[2]
Impaired Financing Receivable, Recorded Investment	216	[3]		238	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	39	[3]		43	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	177	[3]		195	[3]
Impaired Financing Receivable, Related Allowance	63			69
Impaired Financing Receivable, Coverage Percentage	36.00%	[4]		36.70%	[4]
Non Accrual [Member] | Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	3	[1]		3	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	0	[2]		0	[2]
Impaired Financing Receivable, Recorded Investment	3	[3]		3	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3	[3]		3	[3]
Impaired Financing Receivable, Related Allowance	2			1
Impaired Financing Receivable, Coverage Percentage	66.70%	[4]		33.30%	[4]
Non Accrual [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	575	[1]		556	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	59	[2]		65	[2]
Impaired Financing Receivable, Recorded Investment	516	[3]		491	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	78	[3]		54	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	438	[3]		437	[3]
Impaired Financing Receivable, Related Allowance	142			153
Impaired Financing Receivable, Coverage Percentage	35.00%	[4]		39.20%	[4]
Non Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	122	[1]		162	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	37	[2]		39	[2]
Impaired Financing Receivable, Recorded Investment	85	[3]		123	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18	[3]		26	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	67	[3]		97	[3]
Impaired Financing Receivable, Related Allowance	19			30
Impaired Financing Receivable, Coverage Percentage	45.90%	[4]		42.60%	[4]
Non Accrual [Member] | Commercial Investor Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	1	[1]		3	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	1	[2]		1	[2]
Impaired Financing Receivable, Recorded Investment	0	[3]		2	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[3]		2	[3]
Impaired Financing Receivable, Related Allowance	0			1
Impaired Financing Receivable, Coverage Percentage	100.00%	[4]		66.70%	[4]
Non Accrual [Member] | Total Investor Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	123	[1]		165	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	38	[2]		40	[2]
Impaired Financing Receivable, Recorded Investment	85	[3]		125	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18	[3]		26	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	67	[3]		99	[3]
Impaired Financing Receivable, Related Allowance	19			31
Impaired Financing Receivable, Coverage Percentage	46.30%	[4]		43.00%	[4]
Non Accrual [Member] | Residential First Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	73	[1]		79	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	24	[2]		26	[2]
Impaired Financing Receivable, Recorded Investment	49	[3]		53	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	49	[3]		53	[3]
Impaired Financing Receivable, Related Allowance	6			7
Impaired Financing Receivable, Coverage Percentage	41.10%	[4]		41.80%	[4]
Non Accrual [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	21	[1]		22	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	7	[2]		7	[2]
Impaired Financing Receivable, Recorded Investment	14	[3]		15	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	14	[3]		15	[3]
Impaired Financing Receivable, Related Allowance	1			1
Impaired Financing Receivable, Coverage Percentage	38.10%	[4]		36.40%	[4]
Non Accrual [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	94	[1]		101	[1]
Impaired Financing Receivable Chargeoffs And Payments Applied	31	[2]		33	[2]
Impaired Financing Receivable, Recorded Investment	63	[3]		68	[3]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[3]		0	[3]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	63	[3]		68	[3]
Impaired Financing Receivable, Related Allowance	$7			$8
Impaired Financing Receivable, Coverage Percentage	40.40%	[4]		40.60%	[4]
[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_Cr7

Loans and the Allowance for Credit Losses (Loans By Class Modified In TDR) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Obligator	Obligator
Financing Receivable, Modifications [Line Items]
Number of Obligors	490	652
Recorded Investment	$146	$314
Increase in Allowance at Modification	7	5
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	41	91
Recorded Investment	57	94
Increase in Allowance at Modification	1	0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	42	85
Recorded Investment	25	70
Increase in Allowance at Modification	1	1
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors		1
Recorded Investment		1
Increase in Allowance at Modification		0
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	83	177
Recorded Investment	82	165
Increase in Allowance at Modification	2	1
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	29	98
Recorded Investment	24	107
Increase in Allowance at Modification	1	0
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	1	15
Recorded Investment	1	7
Increase in Allowance at Modification	0	0
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	30	113
Recorded Investment	25	114
Increase in Allowance at Modification	1	0
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	133	125
Recorded Investment	32	24
Increase in Allowance at Modification	4	4
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	125	154
Recorded Investment	6	10
Increase in Allowance at Modification	0	0
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	32	32
Recorded Investment	0	0
Increase in Allowance at Modification	0	0
Indirect And Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	87	51
Recorded Investment	1	1
Increase in Allowance at Modification	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors	377	362
Recorded Investment	39	35
Increase in Allowance at Modification	$4	$4

Loans_and_the_Allowance_for_Cr8

Loans and the Allowance for Credit Losses (Loans Modified In Past Twelve Months Which Subsequently Defaulted) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	$6	$58
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	1	42
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	1	3
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	2	45
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	1	2
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	0	1
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	1	3
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	3	9
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	0	1
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Defaulted during period, where modified in a TDR twelve months prior to default	$3	$10

Loans_and_the_Allowance_for_Cr9

Loans and the Allowance for Credit Losses (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans first reported as new TDRs	$107,000,000	$121,000,000
Nonperforming Loans Classified As Held For Sale	32,000,000		38,000,000
Re-Defaulted Commercial And Investor Real Estate Loans Modified In Tdr During Period And On Non Accrual Status	28,000,000
Re-Defaulted Commercial And Investor Real Estate Loans Modified In Tdr During Period On Non Accrual Status and 90 days or more past due	0.014
Nonperforming Loans Transferred To Held For Sale Net Of Charge Offs	12,000,000	15,000,000
Nonperforming Loans Chargeoffs Upon Transfer To Held For Sale	7,000,000	8,000,000
Loans and Loans Held For Sale on Nonaccrual Status	832,000,000		867,000,000
Quantitative Scope For Specific Evaluation For Impairment	2,500,000
Consumer Loans Default at 90 Days Past Due and Still Accruing	90 days
Total Restructured Binding Unfunded Commitment	99,000,000
Federal Home Loan Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged loans	13,300,000,000
Federal Reserve Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged loans	30,000,000,000
Indirect Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Indirect loans purchased	256,000,000	246,000,000
Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructuring Modification Recorded Investment In Excess Of One Hundred Eighty Days Past Due And Collateral Dependent	58,000,000
Home Equity First Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructuring Modification Recorded Investment In Excess Of One Hundred Eighty Days Past Due And Collateral Dependent	8,000,000
Home Equity Second Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs in excess of 120 days past due and collateral dependent	$5,000,000
Minimum [Member] | Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing period for consumer loans, in years	15 years
Maximum [Member] | Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing period for consumer loans, in years	30 years

Servicing_of_Financial_Assets_1

Servicing of Financial Assets (Analysis Of Mortgage Servicing Rights Under The Fair Value Measurement Method) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value, beginning of period	$257		$297
Additions	7		8
Increase (decrease) in fair value, due to change in valuation inputs or assumptions	-17	[1]	-10	[1]
Increase (decrease) in fair value, economic amortization associated with borrower repayments	-8	[1]	-7	[1]
Carrying value, end of period	$239		$288
[1]	"Economic amortization associated with borrower repayments" includes both total loan payoffs as well as partial paydowns. Prior to the fourth quarter of 2014, this line item reflected total loan payoffs only, while partial paydowns were included in the "Due to change in valuation inputs or assumptions" line item. The 2014 three months ended amount disclosed in the table has been reclassified to reflect the revised presentation.

Servicing_of_Financial_Assets_2

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 Mortgage Servicing Rights) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	BasisPoint	BasisPoint
Transfers and Servicing of Financial Assets [Abstract]
Unpaid principal balance	$26,903	$27,785
Weighted-average prepayment speed (CPR; percentage)	12.70%	9.30%
Estimated impact on fair value of a 10% increase in prepayment speed	-14	-12
Estimated impact on fair value of a 20% increase in prepayment speed	-27	-23
Option-adjusted spread (basis points)	1,006	880
Estimated impact on fair value of a 10% increase in other assumptions	-9	-9
Estimated impact on fair value of a 20% increase in other assumptions	($18)	($18)
Weighted-average coupon interest rate	4.40%	4.50%
Weighted-average remaining maturity (months)	279 months	279 months
Weighted-average servicing fee (basis points)	27.8	27.7

Servicing_of_Financial_Assets_3

Servicing of Financial Assets (Schedule Of Fees Resulting From The Servicing Of Mortgage Loans) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Transfers and Servicing of Financial Assets [Abstract]
Servicing related fees and other ancillary income	$20	$21

Servicing_of_Financial_Assets_4

Servicing of Financial Assets (Analysis Of Repurchase Liability Related To Mortgage Loans Sold With Representations And Warranty Provisions) (Details) (Obligation to Repurchase Receivables Sold [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Obligation to Repurchase Receivables Sold [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$26	$39
Additions	1	3
Losses	-1	-3
Valuation Allowances and Reserves, Balance	$26	$39

Servicing_of_Financial_Assets_5

Servicing of Financial Assets (Narrative) (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Jul. 18, 2014
In Millions, unless otherwise specified
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance	$26,903	$27,785
Licensing Agreements [Member]
Servicing Assets at Fair Value [Line Items]
Other Intangible Assets, Net			15
DUS Portfolio [Member]
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance	1,000		1,000
Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost	11		12
Loss Share Guarantee	$3		$4

Goodwill_Schedule_of_Goodwill_

Goodwill (Schedule of Goodwill) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Goodwill [Line Items]
Goodwill	$4,816	$4,816
Corporate Bank [Member]
Goodwill [Line Items]
Goodwill	2,258	2,258
Consumer Bank [Member]
Goodwill [Line Items]
Goodwill	2,095	2,095
Wealth Management [Member]
Goodwill [Line Items]
Goodwill	$463	$463

Stockholders_Equity_and_Accumu2

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) Preferred Stock Issuances (Details) (USD $)	3 Months Ended		120 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Sep. 15, 2024	Dec. 31, 2014
Preferred Units [Line Items]
Auction Market Preferred Securities, Stock Series, Liquidation Value	$1,000
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	868			884
Series B Preferred Stock [Member]
Preferred Units [Line Items]
Auction Market Preferred Securities, Stock Series, Liquidation Value	500
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	457			465
Preferred Stock, Dividend Rate, Percentage	6.38%	[1]
Series A Preferred Stock [Member]
Preferred Units [Line Items]
Auction Market Preferred Securities, Stock Series, Liquidation Value	500
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	$411			$419
Preferred Stock, Dividend Rate, Percentage	6.38%
Subsequent Event [Member] | Depositary Shares [Member] | Series B Preferred Stock [Member] | Non Cumulative Perpetual Preferred Stock [Member]
Preferred Units [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.38%
Subsequent Event [Member] | Depositary Shares [Member] | Series B Preferred Stock [Member] | Plus 3-Month LIBOR [Member] | Non Cumulative Perpetual Preferred Stock [Member]
Preferred Units [Line Items]
Preferred Stock, Dividend Rate, Percentage			3.54%
[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%.

Recovered_Sheet1

Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended	1 Months Ended	120 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 23, 2015	5-May-15	Sep. 15, 2024	Apr. 24, 2014
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Dividends, Preferred Stock	$16,000,000	$8,000,000
Payments for Repurchase of Common Stock	102,000,000	8,000,000
Cash dividend declared (in dollars per share)	$0.05	$0.03
Common stock purchase plan						350,000,000
Shares repurchased	11
Series A Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Dividends, Preferred Stock	8,000,000	8,000,000
Series B Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Dividends, Preferred Stock	8,000,000
Non Cumulative Perpetual Preferred Stock [Member] | Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, liquidation preference per share (in dollars per share)	$1,000
Non Cumulative Perpetual Preferred Stock [Member] | 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
Debt Instrument, Redemption, Period One [Member] | Non Cumulative Perpetual Preferred Stock [Member] | Series A Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred Stock, Redemption Terms	90 days
Subsequent Event [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Payments for Repurchase of Common Stock				68,000,000
Cash dividend declared (in dollars per share)			$0.06
Common stock purchase plan			$875,000,000
Shares repurchased				7
Depositary Shares [Member] | Subsequent Event [Member] | Non Cumulative Perpetual Preferred Stock [Member] | Series B Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred stock quarterly dividend rate for the ten years beginning, unless redeemed					6.38%
Depositary Shares [Member] | Subsequent Event [Member] | Plus 3-Month LIBOR [Member] | Non Cumulative Perpetual Preferred Stock [Member] | Series B Preferred Stock [Member]
Stockholders' Equity And Comprehensive Income (Loss) [Line Items]
Preferred stock quarterly dividend rate for the ten years beginning, unless redeemed					3.54%

Stockholders_Equity_and_Accumu3

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss), Held to Maturity, Net Securities Adjustment, Net of Tax, Period Start	($55)	($64)
Other Comprehensive Income (Loss), Unrealized Losses on Securitites, Transfered to Held to Maturity, adjustment, net of tax	2	2
Accumulated Other Comprehensive Income (Loss), Held to Maturity, Net Securities Adjustment, Net of Tax, Period End	-53	-62
Unrealized gains on securities available for sale, Beginning of Period	175	-22
Unrealized gains on securities available for sale, Net Change	77	78
Unrealized gains on securities available for sale, End of Period	252	56
Unrealized gains on derivative instruments designated as cash flow hedges, Beginning of Period	33	15
Unrealized gains on derivative instruments designated as cash flow hedges, Net Change	37	6
Unrealized gains on derivative instruments designated as cash flow hedges, End of Period	70	21
Defined benefit pension plans and other post employment benefits, Beginning of Period	-391	-248
Defined benefit pension plans and other post employment benefits, Net Change	7	4
Defined benefit pension plans and other post employment benefits, End of Period	-384	-244
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start	-238	-319
Other Comprehensive Income (Loss), Net of Tax	123	90
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End	($115)	($229)

Stockholders_Equity_and_Accumu4

Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) Reclassification from Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Net of Tax	$2		$2
Securities gains (losses), net	5		2
Income tax (expense) benefit	-95		-151
Gain or Loss Reclassified from AOCI into Income	33	[1],[2]	28	[1],[2]
Amortization of Prior Service Cost	0		0
Amortization of Actuarial Loss	12		6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	14	[3]	12	[3]
Unrealized Loss, Held to Maturity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Unrealized Losses on Securities Transferred to Held to Maturity into Income, Before Tax	-3	[3]	-3	[3]
Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Net of Tax	-2	[3]	-2	[3]
Income tax (expense) benefit	1	[3]	1	[3]
Unrealized Gains and Losses, Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses), net	5	[3]	2	[3]
Income tax (expense) benefit	-2	[3]	-1	[3]
Unrealized Gains And Losses On Available-for-Sale Securities, Net of Tax	3	[3]	1	[3]
Gains and Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	-12	[3]	-11	[3]
Gain and Loss on Cash Flow Hedges, Net of Tax	21	[3]	17	[3]
Gain or Loss Reclassified from AOCI into Income	33	[3]	28	[3]
Amortization of Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service Cost	0	[3],[4]	0	[3],[4]
Amortization of Actuarial Loss	-12	[3],[4]	-6	[3],[4]
Amortization of Defined Benefit Pension Items, Total Before Tax	-12	[3]	-6	[3]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax (Expense) or Benefit	4	[3]	2	[3]
Amortization of Defined Benefit Pension Items, Net of Tax	($8)	[3]	($4)	[3]
[1]	All cash flow hedges were highly effective for all periods presented, and the change in fair value attributed to hedge ineffectiveness was not material.
[2]	Pre-tax
[3]	Amounts in parentheses indicate reductions to net income.
[4]	These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost and are included in salaries and employee benefits on the consolidated statements of income (see Note 10 for additional details).

Earnings_Loss_Per_Common_Share

Earnings (Loss) Per Common Share (Computation Of Basic And Diluted Earnings (Loss) Per Common Share) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Numerator [Abstract]
Income from continuing operations	$236		$303
Preferred stock dividends	-16		-8
Net Income Loss From Continuing Operations Available To Common Stockholders Basic	220		295
Income (Loss) from discontinued operations, net of tax	-2		12
Net income (loss) available to common shareholders	$218		$307
Earnings per share denominator [Abstract]
Weighted-average common shares outstandingbbasic (in shares)	1,346		1,378
Potential common shares	12		12
Weighted-average common shares outstandingbdiluted (in shares)	1,358		1,390
Earnings per common share from continuing operations:
Basic (in dollars per share)	$0.16	[1]	$0.21	[1]
Diluted (in dollars per share)	$0.16	[1]	$0.21	[1]
Earning (Loss) Per Common Share From Discontinued Operations [Abstract]
Basic (in dollars per share)	$0	[1]	$0.01	[1]
Diluted (in dollars per share)	$0	[1]	$0.01	[1]
Earnings per common share:
Basic (in dollars per share)	$0.16	[1]	$0.22	[1]
Diluted (in dollars per share)	$0.16	[1]	$0.22	[1]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	28		25
[1]	Certain per share amounts may not appear to reconcile due to rounding.

ShareBased_Payments_Summary_Of

Share-Based Payments (Summary Of Activity Related To Stock Options) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding at beginning of period	25,316,676	32,127,235
Number of Options, Granted	0	0
Number of Options, Exercised	-42,056	-1,330,599
Number of Options, Canceled/Forfeited	-4,867,902	-4,070,485
Number of Options, Outstanding at end of period	20,406,718	26,726,151
Number of Options, Exercisable at end of period	20,406,718	26,293,952
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Outstanding at beginning of period (in dollars per share)	$23.07	$22.81
Weighted-Average Exercise Price, Granted (in dollars per share)	$0	$0
Weighted-Average Exercise Price, Exercised (in dollars per share)	$7	$4.29
Weighted-Average Exercise Price, Canceled/Forfeited (in dollars per share)	$33.77	$30.53
Weighted-Average Exercise Price, Outstanding at end of period (in dollars per share)	$20.98	$22.55
Weighted-Average Exercise Price, Exercisable at end of period (in dollars per share)	$20.98	$22.82

ShareBased_Payments_Summary_Of1

Share-Based Payments (Summary Of Restricted Stock Award And Unit Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Shares, Non-vested at beginning of period	18,427,409	16,212,198
Number of Shares, Granted	454,147	21,233
Number of Shares, Vested	-591,101	-494,932
Number of Shares, Forfeited	-152,044	-59,149
Number of Shares, Non-vested at end of period	18,138,411	15,679,350
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant Date Fair Value, Non-vested at beginning of period (in dollars per share)	$8.07	$6.83
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	$5.88	$9.89
Weighted-Average Grant Date Fair Value, Vested (in dollars per share)	$6.15	$7.28
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share)	$8.06	$7
Weighted-Average Grant Date Fair Value, Non-vested at end of period (in dollars per share)	$8.13	$6.82

ShareBased_Payments_Narrative_

Share-Based Payments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015	Apr. 23, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share equivalents factor, restricted stock granted (in shares)	2.25
Share Equivalent Factor Stock Options (in shares)	1
Number of remaining share equivalents authorized for issuance under the long term compensation plan	41,000,000
Vesting period of stock options and restricted stock (in years)	3 years
Contractual lives of options granted under long-term incentive compensation plans	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	100,000,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		60,000,000

Pension_and_Other_Postretireme2

Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$11	$9
Interest Cost	22	23
Expected Return on Plan Assets	-36	-34
Amortization of Actuarial Loss	12	6
Amortization of Prior Service Cost	0	0
Net Periodic Pension Cost	9	4
Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	10	8
Interest Cost	21	22
Expected Return on Plan Assets	-36	-34
Amortization of Actuarial Loss	11	5
Amortization of Prior Service Cost	0	0
Net Periodic Pension Cost	6	1
Non-qualified 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
Amortization of Prior Service Cost	0	0
Net Periodic Pension Cost	$3	$3

Pension_and_Other_Postretireme3

Pension and Other Postretirement Benefits Narrative (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Defined Benefit Plan, Contributions by Employer	$150

Derivative_Financial_Instrumen2

Derivative Financial Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Disclosure Derivative Financial Instruments And Hedging Activities Narrative [Abstract]
Terminated Cash Flow Hedge Unrealized Gain (Loss) To Be Reclassified From Oci, After Tax Amount	$25,000,000	$56,000,000
Pre-tax income related to amortization of cash flow hedges of loan and debt instruments	11,000,000	11,000,000
Cash flow hedge gain expected to be reclassified from other comprehensive income into earnings within the next 12 months	111,000,000
Pre-tax net income related to amortization of discontinued cash flow hedges	35,000,000
Maximum Length of Time Hedged in Cash Flow Hedge	6 years
Notional amount of interest rate lock commitments	363,000,000		233,000,000
Notional amount of forward rate commitments	678,000,000		621,000,000
Notional amount of forward rate commitments and futures contracts to hedge against mortgage servicing rights	3,500,000,000		3,700,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	486,000,000		392,000,000
Maximum potential future exposure on swap participations	65,000,000
Aggregate fair value of all derivative instruments with credit risk	262,000,000		272,000,000
Posted collateral related to derivative instruments with credit risk	$262,000,000		$272,000,000

Derivative_Financial_Instrumen3

Derivative Financial Instruments and Hedging Activities (Schedule of Derivative Instruments Notional and Fair Value) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Derivative [Line Items]
Derivative, Notional Amount	$80,289		$81,870
Derivative Asset, Fair Value, Gross Asset	1,281	[1]	1,215	[1]
Derivative Liability, Fair Value, Gross Liability	1,239	[1]	1,254	[1]
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	11,360		10,867
Derivative Asset, Fair Value, Gross Asset	97	[1]	44	[1]
Derivative Liability, Fair Value, Gross Liability	53	[1]	61	[1]
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	68,929		71,003
Derivative Asset, Fair Value, Gross Asset	1,184	[1]	1,171	[1]
Derivative Liability, Fair Value, Gross Liability	1,186	[1]	1,193	[1]
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	45,892		45,860
Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,824		3,016
Not Designated as Hedging Instrument [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	16,010		17,978
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	4,203		4,149
Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Fair Value Hedge Assets	13	[1]	6	[1]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	84	[1]	38	[1]
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	948	[1]	941	[1]
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	15	[1]	10	[1]
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	8	[1]	3	[1]
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	213	[1]	217	[1]
Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Fair Value Hedge Liabilities	47	[1]	30	[1]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	6	[1]	31	[1]
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	971	[1]	972	[1]
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	[1]	2	[1]
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	8	[1]	8	[1]
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	206	[1]	211	[1]
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	8,950		8,050
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	$2,410		$2,817
[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.

Derivative_Financial_Instrumen4

Derivative Financial Instruments And Hedging Activities (Schedule Of The Effect Of Derivative Instruments On The Statements Of Operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	($13)		($21)
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	16		25
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	37	[1],[2]	6	[1],[2]
Gain or (Loss) Reclassified from AOCI into Income	33	[1],[3]	28	[1],[3]
Interest Expense [Member] | Forward Starting Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	0	[1],[2]	2	[1],[2]
Gain or (Loss) Reclassified from AOCI into Income	0	[1],[3]	-3	[1],[3]
Interest Income On Loans [Member] | Interest Rate Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	37	[1],[2]	4	[1],[2]
Gain or (Loss) Reclassified from AOCI into Income	33	[1],[3]	31	[1],[3]
Debt/CDs [Member] | Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	4		9
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	4		2
Debt/CDs [Member] | Other Non-Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	7		-8
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	-7		9
Available-for-sale Securities [Member] | Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	-4		-4
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	0		0
Available-for-sale Securities [Member] | Other Non-Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	-20		-18
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	$19		$14
[1]	All cash flow hedges were highly effective for all periods presented, and the change in fair value attributed to hedge ineffectiveness was not material.
[2]	After-tax
[3]	Pre-tax

Derivative_Financial_Instrumen5

Derivative Financial Instruments and Hedging Activities (Schedule of Gains (Losses) Recognized Related to Derivatives Not Designated as Hedging Instruments) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$31		$11
Capital Markets Fee Income [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	7	[1]	4	[1]
Capital Markets Fee Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4	[1]	2	[1]
Capital Markets Fee Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	[1]	0	[1]
Capital Markets Fee Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	-1	[1]	0	[1]
Capital Markets Fee Income [Member] | Other Contract [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4	[1]	2	[1]
Mortgage Income [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	24		7
Mortgage Income [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	13		8
Mortgage Income [Member] | Interest Rate Options [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	7		3
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$4		($4)
[1]	Capital markets fee income and other is included in Other income on the consolidated statements of income.

Derivative_Financial_Instrumen6

Derivative Financial Instruments and Hedging Activities (Offsetting Derivatives) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Offsetting Derivative Asset Securities Purchased Under Agreements to Resell Securities Borrowed [Abstract]
Derivative Asset, Fair Value, Gross Asset	$1,281	[1]	$1,215	[1]
Amount Offset Against Collateral	787	[2]	815	[2]
Derivative Assets	494		400
Financial instruments	8		8
Cash collateral received/posted	0		0
Net amounts	486		392
Offsetting Derivative Liability Securities Sold Under Agreements to Resell Securities Loaned [Abstract]
Derivative Liability, Fair Value, Gross Liability	1,239	[1]	1,254	[1]
Amount Offset Against Collateral	1,000	[2]	1,054	[2]
Derivative Liabilities	239		200
Financial instruments	28		0
Cash collateral received/posted	23		29
Net amounts	188		171
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	330		354
Cash collateral received, offset	118		111
Subject to offsetting [Member]
Offsetting Derivative Asset Securities Purchased Under Agreements to Resell Securities Borrowed [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,180		1,157
Offsetting Derivative Liability Securities Sold Under Agreements to Resell Securities Loaned [Abstract]
Derivative Liability, Fair Value, Gross Liability	1,143		1,195
Not subject to offsetting [Member]
Offsetting Derivative Asset Securities Purchased Under Agreements to Resell Securities Borrowed [Abstract]
Derivative Asset, Fair Value, Gross Asset	101		58
Offsetting Derivative Liability Securities Sold Under Agreements to Resell Securities Loaned [Abstract]
Derivative Liability, Fair Value, Gross Liability	$96		$59
[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.
[2]	At MarchB 31, 2015, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $118 million and cash collateral posted of $330 million. At DecemberB 31, 2014, gross amounts of derivative assets and liabilities offset in the consolidated balance sheets presented above include cash collateral received of $111 million and cash collateral posted of $354 million.

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 $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Reserve Bank Stock	$488		$488
Federal Home Loan Bank Stock	16		39
Trading Securities	107		106
Available-for-sale Securities	22,879		22,580
Mortgages Held-for-sale, Fair Value Disclosure	396		440
Residential Mortgage servicing rights at fair value	239		257		288	297
Derivative Assets	494		400
Derivative Liabilities	239		200
Loans held for sale, at fair value	396		440
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	180		176
Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	234		235
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2		2
Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	16,153		16,038
Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,990		1,964
Commercial Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,556		1,494
Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2,074		1,990
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Reserve Bank Stock	488		488
Federal Home Loan Bank Stock	16		39
Available-for-sale Securities	683		673
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	107		106
Available-for-sale Securities	22,375		22,053
Mortgages Held-for-sale, Fair Value Disclosure	396		440
Derivative Assets	1,281		1,215
Derivative Liabilities	1,239		1,254
Recurring Fair Value Measurements [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	180		176
Recurring Fair Value Measurements [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	234		235
Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2		2
Recurring Fair Value Measurements [Member] | Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	16,153		16,038
Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Recurring Fair Value Measurements [Member] | Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,990		1,964
Recurring Fair Value Measurements [Member] | Commercial Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,556		1,494
Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2,074		1,990
Recurring Fair Value Measurements [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	179	[1]	146	[1]
Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	239		257
Recurring Fair Value Measurements [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	1,045		985
Derivative Liabilities	1,024		1,033
Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	15		10
Derivative Liabilities	1		2
Recurring Fair Value Measurements [Member] | Interest Rate Futures And Forward Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	8		3
Derivative Liabilities	8		8
Recurring Fair Value Measurements [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	213		217
Derivative Liabilities	206		211
Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	14		33
Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	68		49
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	107		106
Available-for-sale Securities	359		322
Derivative Assets	0		0
Derivative Liabilities	0		0
Loans held for sale, at fair value	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	107		106
Available-for-sale Securities	359		322
Mortgages Held-for-sale, Fair Value Disclosure	0		0
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	180		176
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Commercial Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	179	[1]	146	[1]
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Futures And Forward Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 1 [Member] | Recurring Fair Value Measurements [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 1 [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	0		0
Level 1 [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	0		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0
Available-for-sale Securities	22,510		22,247
Derivative Assets	1,267		1,207
Derivative Liabilities	1,239		1,254
Loans held for sale, at fair value	396		440
Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0
Available-for-sale Securities	22,006		21,720
Mortgages Held-for-sale, Fair Value Disclosure	396		440
Derivative Assets	1,267		1,207
Derivative Liabilities	1,239		1,254
Level 2 [Member] | Recurring Fair Value Measurements [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	234		235
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2		2
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	16,153		16,038
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,990		1,964
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Commercial Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	1,556		1,494
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2,071		1,987
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	[1]	0	[1]
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	0		0
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	1,045		985
Derivative Liabilities	1,024		1,033
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	1		2
Derivative Liabilities	1		2
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Futures And Forward Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	8		3
Derivative Liabilities	8		8
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	213		217
Derivative Liabilities	206		211
Level 2 [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	0		0
Level 2 [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	35		41
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0
Available-for-sale Securities	10		11
Derivative Assets	14		8
Derivative Liabilities	0		0
Loans held for sale, at fair value	95		101
Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0
Available-for-sale Securities	10		11
Mortgages Held-for-sale, Fair Value Disclosure	0		0
Derivative Assets	14		8
Derivative Liabilities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Residential Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Commercial Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	3		3
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	[1]	0	[1]
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	239		257
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	14		8
Derivative Liabilities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Futures And Forward Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities	0		0
Level 3 [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	14		33
Level 3 [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	$33		$8
[1]	Excludes Federal Reserve Bank and Federal Home Loan Bank Stock totaling $488 million and $16 million at MarchB 31, 2015 and $488 million and $39 million at DecemberB 31, 2014, respectively.

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) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, Assets, Net	$257		$297
Included in Earnings, Assets	-25	[1]	-17	[1]
Assets included in other comprehensive income (loss)	0		0
Asset purchases	7		8
Asset sales	0		0
Issuances	0		0
Asset settlements	0		0
Transfers Into Level 3	0		0
Transfers Out Of Level 3	0		0
Ending balance, Assets, Net	239		288
Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, Assets, Net	8		5
Included in Earnings, Assets	28	[1]	21	[1]
Assets included in other comprehensive income (loss)	0		0
Asset purchases	0		0
Asset sales	0		0
Issuances	0		0
Asset settlements	-22		-18
Transfers Into Level 3	0		0
Transfers Out Of Level 3	0		0
Ending balance, Assets, Net	14		8
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, Assets, Net	11		11
Included in Earnings, Assets	0		0
Assets included in other comprehensive income (loss)	0		0
Asset purchases	0		3
Asset sales	0		0
Issuances	0		0
Asset settlements	-1		-2
Transfers Into Level 3	0		0
Transfers Out Of Level 3	0		0
Ending balance, Assets, Net	10		12
Available-for-sale Securities [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, Assets, Net	8		9
Included in Earnings, Assets	0		0
Assets included in other comprehensive income (loss)	0		0
Asset purchases	0		0
Asset sales	0		0
Issuances	0		0
Asset settlements	-1		0
Transfers Into Level 3	0		0
Transfers Out Of Level 3	0		0
Ending balance, Assets, Net	7		9
Available-for-sale Securities [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance, Assets, Net	3		2
Included in Earnings, Assets	0		0
Assets included in other comprehensive income (loss)	0		0
Asset purchases	0		3
Asset sales	0		0
Issuances	0		0
Asset settlements	0		-2
Transfers Into Level 3	0		0
Transfers Out Of Level 3	0		0
Ending balance, Assets, Net	$3		$3
[1]	Included in mortgage income.

Fair_Value_Measurements_Schedu1

Fair Value Measurements (Schedule Of Fair Value Adjustments Related To Non-Recurring Fair Value Measurements) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	($7)	($15)
Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	($7)	($7)

Fair_Value_Measurements_Summar

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$22,879		$22,580
Residential Mortgage servicing rights at fair value	239		257		288	297
Interest rate options	494		400
Loans held for sale, at fair value	396		440
Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2,074		1,990
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	22,375		22,053
Interest rate options	1,281		1,215
Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	2,074		1,990
Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	239		257
Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate options	15		10
Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	14		33
Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	68		49
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member] | Spread To LIBOR [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	14.60%		12.30%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	9.40%		9.50%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member] | Probability of Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	1.40%		1.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	40.20%		37.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	12.70%	[1]	12.00%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	10.10%	[1]	9.00%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	12.70%		12.00%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	10.10%		9.00%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member] | Pull-Through [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	86.90%		87.80%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Non Agency [Member] | Spread To LIBOR [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	5.30%		5.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Non Agency [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	5.50%		6.30%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Non Agency [Member] | Probability of Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	1.40%		1.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Non Agency [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	40.20%		37.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Mortgage Servicing Rights [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	11.90%	[1]	9.90%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Mortgage Servicing Rights [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	8.70%	[1]	7.70%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Interest Rate Options [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	11.90%		9.90%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Interest Rate Options [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	8.70%		7.70%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Interest Rate Options [Member] | Pull-Through [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	20.30%		7.30%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Non Agency [Member] | Spread To LIBOR [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	49.80%		49.90%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Non Agency [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	14.20%		15.00%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Non Agency [Member] | Probability of Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	1.40%		1.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Non Agency [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	40.20%		37.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Mortgage Servicing Rights [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	14.00%	[1]	22.40%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Mortgage Servicing Rights [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	17.40%	[1]	11.30%	[2]
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Interest Rate Options [Member] | Weighted Average Prepayment Speed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	14.00%		22.40%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Interest Rate Options [Member] | Option-Adjusted Spread (Basis Points) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	17.40%		11.30%
Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Interest Rate Options [Member] | Pull-Through [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	99.10%		99.10%
Comparable Evaluated Quote [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member] | Evaluated Quote On Same Issuer/Comparable Bond [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	99.90%		99.90%
Comparable Evaluated Quote [Member] | Recurring Fair Value Measurements [Member] | Minimum [Member] | Corporate and Other Debt Securities [Member] | Evaluated Quote On Same Issuer/Comparable Bond [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	99.90%		99.90%
Comparable Evaluated Quote [Member] | Recurring Fair Value Measurements [Member] | Maximum [Member] | Corporate and Other Debt Securities [Member] | Evaluated Quote On Same Issuer/Comparable Bond [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	99.90%		99.90%
Property Appraisal [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	28.20%		29.60%
Property Appraisal [Member] | Nonrecurring Fair Value Measurements [Member] | Minimum [Member] | Foreclosed Property And Other Real Estate [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	25.00%		3.70%
Property Appraisal [Member] | Nonrecurring Fair Value Measurements [Member] | Maximum [Member] | Foreclosed Property And Other Real Estate [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	61.70%		73.00%
Commercial [Member] | Activity For Sales Of Similar Loans [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement weighted-average percentage	63.70%		53.30%
Commercial [Member] | Activity For Sales Of Similar Loans [Member] | Nonrecurring Fair Value Measurements [Member] | Minimum [Member] | Loans Held For Sale [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	27.30%		8.30%
Commercial [Member] | Activity For Sales Of Similar Loans [Member] | Nonrecurring Fair Value Measurements [Member] | Maximum [Member] | Loans Held For Sale [Member] | Appraisal Compatibility Adjustment Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Range Percentage	99.90%		90.90%
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	10		11
Interest rate options	14		8
Loans held for sale, at fair value	95		101
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	10		11
Interest rate options	14		8
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	3		3
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	239		257
Level 3 [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate options	14		8
Level 3 [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	14		33
Level 3 [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	33		8
Level 3 [Member] | Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Non Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	7		8
Level 3 [Member] | Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Residential Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential Mortgage servicing rights at fair value	239	[1]	257	[2]
Level 3 [Member] | Discounted Cash Flow [Member] | Recurring Fair Value Measurements [Member] | Interest Rate Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate options	14		8
Level 3 [Member] | Comparable Evaluated Quote [Member] | Recurring Fair Value Measurements [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	3		3
Level 3 [Member] | Property Appraisal [Member] | Nonrecurring Fair Value Measurements [Member] | Foreclosed Property And Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed property and other real estate	33		8
Level 3 [Member] | Commercial [Member] | Activity For Sales Of Similar Loans [Member] | Nonrecurring Fair Value Measurements [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, at fair value	$14		$33
[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, 2014 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.

Fair_Value_Measurements_Summar1

Fair Value Measurements (Summary Of Difference Between Aggregate Fair Value And Aggregate Unpaid Principal Balance For Mortgage Loans Held For Sale Measured At Fair Value) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$396	$440
Aggregate Unpaid Principal	381	421
Aggregate Fair Value Less Aggregate Unpaid Principal	$15	$19

Fair_Value_Measurements_Summar2

Fair Value Measurements (Summary of Net Gains (Losses) From Changes In Fair Value (Details) (Loans Held For Sale [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) resulting from changes in fair value	($4)	$6

Fair_Value_Measurements_Schedu2

Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Trading account securities	$107,000,000		$106,000,000
Held-to-maturity Securities, Fair Value	2,186,000,000		2,209,000,000
Available-for-sale Securities	22,879,000,000		22,580,000,000
Loans held for sale, at fair value	396,000,000		440,000,000
Other interest-earning assets	83,000,000		89,000,000
Derivative Assets	494,000,000		400,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	239,000,000		200,000,000
Fair Value Discount On Loan Portfolio Amount	3,600,000,000		4,400,000,000
Fair value discount on loan portfolio, rate	4.80%		5.90%
Leases, carrying amount excluded	1,800,000,000		1,700,000,000
Carrying Amount [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	6,026,000,000		4,004,000,000
Trading account securities	107,000,000		106,000,000
Held-to-maturity Securities, Fair Value	2,129,000,000		2,175,000,000
Available-for-sale Securities	22,879,000,000		22,580,000,000
Loans held for sale, at fair value	491,000,000		541,000,000
Loans Receivable, Fair Value Disclosure	75,324,000,000	[1],[2]	74,482,000,000	[3],[4]
Other interest-earning assets	83,000,000		89,000,000
Derivative Assets	1,281,000,000		1,215,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	1,239,000,000		1,254,000,000
Deposits	97,477,000,000		94,200,000,000
Short-term Debt, Fair Value	2,085,000,000		2,253,000,000
Long-term Debt, Fair Value	3,208,000,000		3,462,000,000
Loan commitments and letters of credit	104,000,000		106,000,000
Indemnification obligation	204,000,000		206,000,000
Estimate of Fair Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	6,026,000,000	[5]	4,004,000,000	[5]
Trading account securities	107,000,000	[5]	106,000,000	[5]
Held-to-maturity Securities, Fair Value	2,186,000,000	[5]	2,209,000,000	[5]
Available-for-sale Securities	22,879,000,000	[5]	22,580,000,000	[5]
Loans held for sale, at fair value	491,000,000	[5]	541,000,000	[5]
Loans Receivable, Fair Value Disclosure	71,683,000,000	[1],[2],[5]	70,114,000,000	[3],[4],[5]
Other interest-earning assets	83,000,000	[5]	89,000,000	[5]
Derivative Assets	1,281,000,000	[5]	1,215,000,000	[5]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	1,239,000,000	[5]	1,254,000,000	[5]
Deposits	97,469,000,000	[5]	94,186,000,000	[5]
Short-term Debt, Fair Value	2,085,000,000	[5]	2,253,000,000	[5]
Long-term Debt, Fair Value	3,860,000,000	[5]	3,871,000,000	[5]
Loan commitments and letters of credit	544,000,000	[5]	539,000,000	[5]
Indemnification obligation	188,000,000	[5]	198,000,000	[5]
Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	6,026,000,000		4,004,000,000
Trading account securities	107,000,000		106,000,000
Held-to-maturity Securities, Fair Value	1,000,000		1,000,000
Available-for-sale Securities	359,000,000		322,000,000
Loans held for sale, at fair value	0		0
Loans Receivable, Fair Value Disclosure	0	[1],[2]	0	[3],[4]
Other interest-earning assets	0		0
Derivative Assets	0		0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	0		0
Deposits	0		0
Short-term Debt, Fair Value	0		0
Long-term Debt, Fair Value	0		0
Loan commitments and letters of credit	0		0
Indemnification obligation	0		0
Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	0		0
Trading account securities	0		0
Held-to-maturity Securities, Fair Value	2,185,000,000		2,208,000,000
Available-for-sale Securities	22,510,000,000		22,247,000,000
Loans held for sale, at fair value	396,000,000		440,000,000
Loans Receivable, Fair Value Disclosure	0	[1],[2]	0	[3],[4]
Other interest-earning assets	83,000,000		89,000,000
Derivative Assets	1,267,000,000		1,207,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	1,239,000,000		1,254,000,000
Deposits	97,469,000,000		94,186,000,000
Short-term Debt, Fair Value	2,085,000,000		2,253,000,000
Long-term Debt, Fair Value	2,869,000,000		3,504,000,000
Loan commitments and letters of credit	0		0
Indemnification obligation	0		0
Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	0		0
Trading account securities	0		0
Held-to-maturity Securities, Fair Value	0		0
Available-for-sale Securities	10,000,000		11,000,000
Loans held for sale, at fair value	95,000,000		101,000,000
Loans Receivable, Fair Value Disclosure	71,683,000,000	[1],[2]	70,114,000,000	[3],[4]
Other interest-earning assets	0		0
Derivative Assets	14,000,000		8,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Liabilities	0		0
Deposits	0		0
Short-term Debt, Fair Value	0		0
Long-term Debt, Fair Value	991,000,000		367,000,000
Loan commitments and letters of credit	544,000,000		539,000,000
Indemnification obligation	$188,000,000		$198,000,000
[1]	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 at MarchB 31, 2015 was $3.6 billion or 4.8 percent.
[2]	Excluded from this table is the lease carrying amount of $1.8 billion at MarchB 31, 2015.
[3]	Excluded from this table is the lease carrying amount of $1.7 billion at DecemberB 31, 2014.
[4]	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 at DecemberB 31, 2014 was $4.4 billion or 5.9 percent.
[5]	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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
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) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Non-interest income	$470	$457
Non-interest expense	905	817
Income from continuing operations before income taxes	331	454
Income tax expense (benefit)	95	151
Corporate Bank [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	280	283
Provision (Credit) for Loan Losses	0	0
Non-interest income	90	75
Non-interest expense	153	136
Income from continuing operations before income taxes	217	222
Income tax expense (benefit)	82	84
Net income	135	138
Average assets	45,150	42,515
Consumer Bank [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	601	611
Provision (Credit) for Loan Losses	53	81
Non-interest income	265	275
Non-interest expense	589	563
Income from continuing operations before income taxes	224	242
Income tax expense (benefit)	85	92
Net income	139	150
Average assets	37,993	38,728
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	42	43
Provision (Credit) for Loan Losses	2	1
Non-interest income	99	92
Non-interest expense	105	100
Income from continuing operations before income taxes	34	34
Income tax expense (benefit)	13	13
Net income	21	21
Average assets	2,912	2,959
Other [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	-108	-121
Provision (Credit) for Loan Losses	-6	-80
Non-interest income	16	15
Non-interest expense	58	18
Income from continuing operations before income taxes	-144	-44
Income tax expense (benefit)	-85	-38
Net income	-59	-6
Average assets	34,511	33,515
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	815	816
Provision (Credit) for Loan Losses	49	2
Non-interest income	470	457
Non-interest expense	905	817
Income from continuing operations before income taxes	331	454
Income tax expense (benefit)	95	151
Net income	236	303
Average assets	120,566	117,717
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	0	0
Provision (Credit) for Loan Losses	0	0
Non-interest income	0	0
Non-interest expense	4	-19
Income from continuing operations before income taxes	-4	19
Income tax expense (benefit)	-2	7
Net income	-2	12
Average assets	0	0
Consolidated [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	815	816
Provision (Credit) for Loan Losses	49	2
Non-interest income	470	457
Non-interest expense	909	798
Income from continuing operations before income taxes	327	473
Income tax expense (benefit)	93	158
Net income	234	315
Average assets	$120,566	$117,717

Commitments_Contingencies_and_2

Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Other Commitments [Line Items]
Unused commitments to extend credit	$44,642	$43,724
Standby Letters Of Credit Commitment	1,629	1,697
Commercial letters of credit	41	71
Liabilities associated with standby letters of credit	38	40
Assets associated with standby letters of credit	38	40
Reserve for unfunded credit commitments	$66	$65	$78	$78

Commitments_Contingencies_and_3

Commitments, Contingencies and Guarantees (Narrative) (Details) (USD $)	Mar. 31, 2015		Apr. 02, 2012	Dec. 31, 2014
In Millions, unless otherwise specified
Long-term Purchase Commitment [Line Items]
Estimated aggregate amount of losses reasonably possible to be incurred in excess of amounts accrued	$160
Fair value of the indemnification obligation			385
Fair value of the indemnification obligation, incremental increase over FAS 5 reserve			256
Carrying Amount [Member]
Long-term Purchase Commitment [Line Items]
Indemnification obligation	204			206
Carrying Amount [Member] | Indemnification Agreement [Member]
Long-term Purchase Commitment [Line Items]
Indemnification obligation	204
Estimate of Fair Value [Member]
Long-term Purchase Commitment [Line Items]
Indemnification obligation	188	[1]		198	[1]
Estimate of Fair Value [Member] | Indemnification Agreement [Member]
Long-term Purchase Commitment [Line Items]
Indemnification obligation	$188
[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 makes adjustments for interest rates, market liquidity and credit spreads as appropriate.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements (Narrative) (Details) (Retained Earnings [Member], Cumulative effect of adopting ASU 2014-01 [Member], USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Retained Earnings [Member] | Cumulative effect of adopting ASU 2014-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings	$116