First Niagara Financial (FNFG) 10-Q 4 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Entity Information [Line Items]
Entity Registrant Name	FIRST NIAGARA FINANCIAL GROUP INC
Entity Central Index Key	1051741
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		355,063,535

Consolidated_Statements_of_Con

Consolidated Statements of Condition (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
ASSETS
Cash and cash equivalents	$388	$420
Investment securities:
Available for sale, at fair value (amortized cost of $5,801 and $5,830 in 2015 and 2014; includes pledged securities that can be sold or repledged of $123 and $39 in 2015 and 2014)	5,911	5,915
Held to maturity, at amortized cost (fair value of $6,302 and $5,964 in 2015 and 2014; includes pledged securities that can be sold or repledged of $442 and $128 in 2015 and 2014)	6,215	5,942
Federal Home Loan Bank and Federal Reserve Bank common stock, at amortized cost	375	412
Loans held for sale	49	40
Loans and leases (net of allowance for loan losses of $231 and $234 in 2015 and 2014)	22,887	22,803
Bank owned life insurance	428	426
Premises and equipment, net	406	407
Goodwill	1,350	1,350
Core deposit and other intangibles, net	61	67
Other assets	838	769
Total assets	38,907	38,551
Liabilities:
Deposits	28,250	27,781
Short-term borrowings	4,739	5,472
Long-term borrowings	1,234	734
Other	560	471
Total liabilities	34,782	34,458
Stockholders’ equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized; Series B, noncumulative perpetual preferred stock, $25 liquidation preference; 14,000,000 shares issued in 2015 and 2014	338	338
Common stock, $0.01 par value, 500,000,000 shares authorized; 366,002,045 shares issued in 2015 and 2014	4	4
Additional paid-in capital	4,233	4,235
Accumulated deficit	-314	-330
Accumulated other comprehensive income	23	9
Treasury stock, at cost, 12,285,192 and 12,613,836 shares in 2015 and 2014	-158	-162
Total stockholders’ equity	4,125	4,093
Total liabilities and stockholders’ equity	$38,907	$38,551

Consolidated_Statements_of_Con1

Consolidated Statements of Condition (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Amortized cost for securities available for sale	$5,801	$5,830
Fair value of pledged securities that can be sold or repledged	123	39
Fair value for securities held-to-maturity	6,302	5,964
Amortized cost of pledged securities that can be sold or repledged	442	128
Allowance for credit losses on loans and leases	$231	$234
Preferred stock, par value (dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Liquidation preference (dollars per share)	$25	$25
Preferred stock, shares issued	14,000,000	14,000,000
Common stock, par value (dollars per share)	$0.01	$0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	366,002,045	366,002,045
Treasury stock, shares	12,285,192	12,613,836

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans and leases	$210	$210
Investment securities and other	86	90
Total interest income	297	300
Interest expense:
Deposits	15	12
Borrowings	18	17
Total interest expense	34	29
Net interest income	263	271
Provision for credit losses	13	24
Net interest income after provision for credit losses	250	247
Noninterest income:
Deposit service charges	20	23
Insurance commissions	16	16
Merchant and card fees	12	12
Wealth management services	15	16
Mortgage banking	5	3
Capital markets income	4	4
Lending and leasing	4	5
Bank owned life insurance	4	5
Other income	3	-7
Total noninterest income	82	77
Noninterest expense:
Salaries and employee benefits	112	118
Occupancy and equipment	27	28
Technology and communications	35	30
Marketing and advertising	10	7
Professional services	13	12
Amortization of intangibles	6	8
Federal deposit insurance premiums	11	9
Restructuring charges	18	10
Other expense	29	27
Total noninterest expense	261	249
Income before income taxes	71	75
Income tax	20	15
Net income	51	60
Preferred stock dividend	8	8
Net income available to common stockholders	$44	$53
Earnings per share:
Basic	$0.12	$0.15
Diluted	$0.12	$0.15
Weighted average common shares outstanding:
Basic	351	350
Diluted	353	351
Dividends per common share	$0.08	$0.08

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$51	$60
Securities available for sale:
Net unrealized gains arising during the year	16	9
Net unrealized holding gains on securities transferred between available for sale and held to maturity:
Less: amortization of net unrealized holding gains to income during the year	-2	-2
Net unrealized losses on interest rate swaps designated as cash flow hedges arising during the year	-1	0
Amortization of net loss related to pension and post-retirement plans	1	0
Total other comprehensive income	15	7
Total comprehensive income	$66	$67

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $)	Total	Preferred stock	Common stock	Additional paid-in capital	(Accumulated deficit) retained earnings	Accumulated other comprehensive income	Common stock held by ESOP	Treasury stock
In Millions
Beginning balance at Dec. 31, 2013	$4,993	$338	$4	$4,235	$536	$62	($17)	($165)
Net income	60				60
Total other comprehensive income, net	7					7
ESOP shares committed to be released (44,485 shares in 2014)	0			0			0
Stock-based compensation expense	2			2
Restricted stock activity (328,644 shares and 186,151 shares in 2015 and 2014, respectively)	0			-2	-1			3
Preferred stock dividends	-8				-8
Common stock dividends of $0.08 per share	-28				-28
Ending balance at Mar. 31, 2014	5,027	338	4	4,235	560	69	-16	-162
Beginning balance at Dec. 31, 2014	4,093	338	4	4,235	-330	9	0	-162
Net income	51				51
Total other comprehensive income, net	15					15
Stock-based compensation expense	2			2
Restricted stock activity (328,644 shares and 186,151 shares in 2015 and 2014, respectively)	0			-4	0			4
Preferred stock dividends	-8				-8
Common stock dividends of $0.08 per share	-28				-28
Ending balance at Mar. 31, 2015	$4,125	$338	$4	$4,233	($314)	$23	$0	($158)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
ESOP shares committed to be released	0	44,485
Restricted stock activity, shares	328,644	186,151
Common stock, dividend per share	$0.08	$0.08

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$51	$60
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of fees and discounts, net	7	11
Provision for credit losses	13	24
Depreciation of premises and equipment	17	13
Amortization of intangibles	6	8
Origination of loans held for sale	-157	-128
Proceeds from sales of loans held for sale	153	145
ESOP and stock based-compensation expense	2	3
Deferred income tax expense (benefit)	10	-20
Other, net	-57	39
Net cash provided by operating activities	45	154
Cash flows from investing activities:
Proceeds from sales of securities available for sale	25	10
Proceeds from maturities of securities available for sale	67	92
Principal payments received on securities available for sale	267	294
Purchases of securities available for sale	-315	-18
Principal payments received on securities held to maturity	299	150
Purchases of securities held to maturity	-569	-545
Proceeds from maturities of securities held to maturity	15	0
Proceeds from sales of Federal Home Loan Bank and Federal Reserve Bank common stock	37	32
Net increase in loans and leases	-101	-335
Purchases of premises and equipment	-21	-11
Other, net	20	6
Net cash used in investing activities	-277	-326
Cash flows from financing activities:
Net increase in deposits	469	933
Repayments of short-term borrowings, net	-733	-685
Proceeds from long-term borrowings	500	0
Repayments of long-term borrowings	0	-1
Dividends paid on noncumulative preferred stock	-8	-8
Dividends paid on common stock	-28	-28
Net cash provided by financing activities	200	212
Net (decrease) increase in cash and cash equivalents	-32	40
Cash and cash equivalents at beginning of period	420	463
Cash and cash equivalents at end of period	388	503
Cash paid during the period for:
Income taxes	34	36
Interest expense	33	30
Other noncash activity:
Securities available for sale purchased not settled	37	36
Securities held to maturity purchased not settled	$25	$6

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	The amortized cost, gross unrealized gains and losses, and fair value of our investment securities at the dates indicated are summarized as follows:
		Amortized		Unrealized			Unrealized			Fair
	31-Mar-15	cost		gains			losses			value
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	426	$	9		$	—		$	435
	U.S. Treasury	55		1			—			55
	U.S. government sponsored enterprises	270		4			—			275
	Corporate	822		19			(8		)	833
	Total debt securities	1,574		33			(8		)	1,599
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	33		1			(1		)	33
	Federal National Mortgage Association	89		5			—			94
	Federal Home Loan Mortgage Corporation	107		5			—			112
	Collateralized mortgage obligations:
	Federal National Mortgage Association	667		6			(4		)	668
	Federal Home Loan Mortgage Corporation	335		3			(1		)	337
	Total collateralized mortgage obligations	1,002		9			(5		)	1,006
	Total residential mortgage-backed securities	1,231		19			(6		)	1,244
	Commercial mortgage-backed securities, non-agency issued	1,351		46			—			1,397
	Total mortgage-backed securities	2,582		65			(6		)	2,641
	Collateralized loan obligations, non-agency issued	1,129		19			(1		)	1,146
	Asset-backed securities collateralized by:
	Student loans	223		7			—			230
	Credit cards	42		1			—			43
	Auto loans	148		1			—			149
	Other	82		1			—			83
	Total asset-backed securities	494		10			—			504
	Other	22		—			—			22
	Total securities available for sale	$	5,801	$	127		$	(16	)	$	5,911
	Investment securities held to maturity:
	Debt securities, U.S. government agencies	$	45	$	—		$	—		$	45
	Residential mortgage-backed securities:
	Government National Mortgage Association	11		—			—			11
	Federal National Mortgage Association	111		1			—			112
	Federal Home Loan Mortgage Corporation	61		1			—			61
	Collateralized mortgage obligations:
	Government National Mortgage Association	1,630		34			(2		)	1,662
	Federal National Mortgage Association	2,042		25			(8		)	2,060
	Federal Home Loan Mortgage Corporation	2,315		44			(8		)	2,351
	Total collateralized mortgage obligations	5,987		103			(17		)	6,073
	Total residential mortgage-backed securities	6,169		105			(17		)	6,257
	Total securities held to maturity	$	6,215	$	105		$	(17	)	$	6,302
		Amortized		Unrealized			Unrealized			Fair
	31-Dec-14	cost		gains			losses			value
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	444	$	10		$	—		$	453
	U.S. Treasury	25		—			—			25
	U.S. government sponsored enterprises	187		5			—			191
	Corporate	820		15			(12		)	823
	Total debt securities	1,476		29			(12		)	1,492
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	34		1			(1		)	34
	Federal National Mortgage Association	96		5			—			100
	Federal Home Loan Mortgage Corporation	115		5			—			120
	Collateralized mortgage obligations:
	Federal National Mortgage Association	694		2			(13		)	682
	Federal Home Loan Mortgage Corporation	353		1			(4		)	350
	Total collateralized mortgage obligations	1,047		3			(18		)	1,032
	Total residential mortgage-backed securities	1,291		13			(19		)	1,286
Commercial mortgage-backed securities, non-agency issued	1,450		51			—			1,500
Total mortgage-backed securities	2,741		64			(19		)	2,786
Collateralized loan obligations, non-agency issued	1,001		18			(3		)	1,016
Asset-backed securities collateralized by:
Student loans	228		7			—			235
Credit cards	42		—			—			42
Auto loans	193		1			—			194
Other	127		1			(1		)	127
Total asset-backed securities	591		9			(1		)	599
Other	22		—			—			22
Total securities available for sale	$	5,830	$	121		$	(35	)	$	5,915
Investment securities held to maturity:
Debt securities, U.S. government agencies	$	60	$	—		$	—		$	60
Residential mortgage-backed securities:
Government National Mortgage Association	12		—			—			12
Federal National Mortgage Association	118		1			(1		)	118
Federal Home Loan Mortgage Corporation	65		1			—			65
Collateralized mortgage obligations:
Government National Mortgage Association	1,755		27			(3		)	1,779
Federal National Mortgage Association	1,965		11			(22		)	1,954
Federal Home Loan Mortgage Corporation	1,967		25			(17		)	1,976
Total collateralized mortgage obligations	5,687		63			(41		)	5,709
Total residential mortgage-backed securities	5,882		64			(42		)	5,904
Total securities held to maturity	$	5,942	$	64		$	(42	)	$	5,964
The table below details certain information regarding our investment securities that were in an unrealized loss position at the dates indicated by the length of time those securities were in a continuous loss position:
	Less than 12 months								12 months or longer						Total
	Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
31-Mar-15	value		losses			Count			value		losses			Count	value		losses			Count
Investment securities available for sale:
Debt securities:
States and political subdivisions	$	14	$	—		19			$	1	$	—		5	$	14	$	—		24
U.S. Treasury	10		—			1			—		—			—	10		—			1
U.S. government sponsored enterprises	61		—			8			1		—			1	62		—			9
Corporate	133		(4		)	75			75		(3		)	41	208		(8		)	116
Total debt securities	217		(5		)	103			77		(3		)	47	295		(8		)	150
Mortgage-backed securities:
Residential mortgage-backed securities:
Government National Mortgage Association	—		—			—			19		(1		)	5	19		(1		)	5
Federal National Mortgage Association	—		—			1			—		—			—	—		—			1
Collateralized mortgage obligations:
Federal National Mortgage Association	—		—			—			185		(4		)	10	185		(4		)	10
Federal Home Loan Mortgage Corporation	15		—			1			46		(1		)	2	62		(1		)	3
Total collateralized mortgage obligations	15		—			1			231		(5		)	12	247		(5		)	13
Total residential mortgage-backed securities	15		—			2			250		(6		)	17	265		(6		)	19
Commercial mortgage-backed securities, non-agency issued	21		—			7			5		—			1	26		—			8
Total mortgage-backed securities	36		—			9			255		(6		)	18	291		(6		)	27
Collateralized loan obligations, non-agency issued	150		(1		)	18			159		(1		)	17	309		(1		)	35
Asset-backed securities collateralized by:
Student loans	23		—			3			1		—			1	24		—			4
Auto loans	3		—			2			—		—			—	3		—			2
Other	26		—			2			26		—			3	52		—			5
Total asset-backed securities	51		—			7			28		—			4	79		—			11
Other	—		—			—			9		—			3	9		—			3
Total securities available for sale in an unrealized loss position	$	455	$	(5	)	137			$	528	$	(11	)	89	$	983	$	(16	)	226
	Less than 12 months								12 months or longer						Total
	Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
31-Mar-15	value		losses			Count			value		losses			Count	value		losses			Count
Investment securities held to maturity:
Residential mortgage-backed securities:
Government National Mortgage Association	—		—			—			2		—			2	2		—			2
Federal National Mortgage Association	7		—			5			33		—			9	40		—			14
Federal Home Loan Mortgage Corporation	1		—			2			4		—			1	5		—			3
Collateralized mortgage obligations:
Government National Mortgage Association	68		—			15			114		(1		)	24	183		(2		)	39
Federal National Mortgage Association	2		—			2			460		(8		)	27	462		(8		)	29
Federal Home Loan Mortgage Corporation	123		—			9			383		(7		)	23	506		(8		)	32
Total collateralized mortgage obligations	194		(1		)	26			957		(16		)	74	1,151		(17		)	100
Total residential mortgage-backed securities	202		(1		)	33			996		(17		)	86	1,198		(17		)	119
Total securities held to maturity in an unrealized loss position	$	202	$	(1	)	33			$	996	$	(17	)	86	$	1,198	$	(17	)	119
	Less than 12 months								12 months or longer						Total
	Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
31-Dec-14	value		losses			Count			value		losses			Count	value		losses			Count
Investment securities available for sale:
Debt securities:
States and political subdivisions	$	16	$	—		22			$	1	$	—		5	$	17	$	—		27
US Treasury	5		—			1			—		—			—	5		—			1
U.S. government sponsored enterprises	18		—			7			42		—			4	60		—			11
Corporate	176		(7		)	127			102		(5		)	61	278		(12		)	188
Total debt securities	215		(7		)	157			145		(5		)	70	360		(12		)	227
Mortgage-backed securities:
Residential mortgage-backed securities:
Government National Mortgage Association	—		—			—			19		(1		)	5	19		(1		)	5
Collateralized mortgage obligations:
Federal National Mortgage Association	26		—			3			517		(13		)	30	542		(13		)	33
Federal Home Loan Mortgage Corporation	47		—			3			216		(4		)	12	263		(4		)	15
Total collateralized mortgage obligations	73		—			6			733		(18		)	42	806		(18		)	48
Total residential mortgage-backed securities	73		—			6			752		(19		)	47	825		(19		)	53
Commercial mortgage-backed securities, non-agency issued	13		—			3			24		—			3	36		—			6
Total mortgage-backed securities	85		—			9			776		(19		)	50	861		(19		)	59
Collateralized loan obligations, non-agency issued	276		(2		)	32			146		(1		)	15	422		(3		)	47
Asset-backed securities collateralized by:
Student loans	26		—			4			2		—			2	28		—			6
Credit card	8		—			1			—		—			—	8		—			1
Auto loans	3		—			2			—		—			—	3		—			2
Other	—		—			1			52		(1		)	5	52		(1		)	6
Total asset-backed securities	37		—			8			55		(1		)	7	92		(1		)	15
Other	—		—			—			9		—			3	9		—			3
Total securities available for sale in an unrealized loss position	$	614	$	(10	)	206			$	1,130	$	(26	)	145	$	1,744	$	(35	)	351
	Less than 12 months								12 months or longer						Total
	Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
31-Dec-14	value		losses			Count			value		losses			Count	value		losses			Count
Investment securities held to maturity:
Debt securities, U.S. government agencies	$	38	$	—		5			$	—	$	—		—	$	38	$	—		5
Residential mortgage-backed securities:
Government National Mortgage Association	—		—			—			2		—			2	2		—			2
Federal National Mortgage Association	4		—			1			51		(1		)	12	55		(1		)	13
Federal Home Loan Mortgage Corporation	33		—			9			9		—			2	42		—			11
Collateralized mortgage obligations:
Government National Mortgage Association	360		(2		)	48			46		(1		)	12	407		(3		)	60
Federal National Mortgage Association	240		(1		)	18			648		(21		)	36	888		(22		)	54
Federal Home Loan Mortgage Corporation	422		(5		)	27			463		(12		)	28	885		(17		)	55
Total collateralized mortgage obligations	1,022		(8		)	93			1,157		(34		)	76	2,179		(41		)	169
Total residential mortgage-backed securities	1,059		(8		)	103			1,219		(35		)	92	2,278		(42		)	195
Total securities held to maturity in an unrealized loss position	$	1,097	$	(8	)	108			$	1,219	$	(35	)	92	$	2,316	$	(42	)	200
We have assessed the securities in an unrealized loss position at March 31, 2015 and at December 31, 2014 and determined that the declines in fair value below amortized cost were temporary.
The Volcker Rule provisions of the Dodd-Frank Act restrict the ability of affiliates of insured depository institutions to sponsor or invest in private funds or to engage in certain types of proprietary trading. Although the Volcker Rule became effective on July 21, 2012 and the final rules became effective April 1, 2014, in connection with the adoption of the final rules on December 10, 2013 by the responsible agencies, the Federal Reserve issued an order extending the period during which institutions have to conform their activities and investments to the requirements of the Volcker Rule to July 21, 2015. The issuance of the final Volcker Rule restricts our ability to hold debt securities issued by Collateralized Loan Obligations ("CLOs") where our investment in these debt securities is deemed to be an ownership interest in a CLO and the CLO itself does not qualify for an exclusion in the final rule for loan securitizations. On December 18, 2014, the Federal Reserve Board announced it would give banking entities until July 21, 2016 to conform investments in covered funds that were in place prior to December 31, 2013 ("legacy covered funds"). The Board also announced its intention to act next year to grant banking entities an additional one-year extension of the conformance period for legacy covered funds which together would extend until July 21, 2017 the time period for institutions to conform their ownership interests to the stated provisions of the final Volcker Rule.
For our CLOs subject to the Volcker Rule in an unrealized loss position, we believe it is more likely than not that we will be able to hold these securities to recovery, which could be maturity as the Federal Reserve announcement extends the conformance period to July 2017 and we believe that other structural remedies are available to us to allow us to continue holding the bonds after the conformance period.
In making the determination that the declines in fair value below amortized cost for the remainder of the portfolio were temporary, we considered some or all of the following factors: the period of time the securities were in an unrealized loss position, the percentage decline in comparison to the securities’ amortized cost, credit rating, the financial condition of the issuer and guarantor, where applicable, the delinquency or default rates of underlying collateral, projected collateral losses, projected cash flows and credit enhancement. If the level of credit enhancement is sufficient based on our expectations of future collateral losses, we conclude that we will receive all of the originally scheduled cash flows. If the present value of the cash flows indicates that we should not expect to recover the amortized cost basis of the security, we would consider the security to be other than temporarily impaired and write down the credit component of the unrealized loss through a charge to current period earnings. We do not intend to sell these securities in an unrealized loss position and it is not more likely than not that we will be required to sell these securities before the recovery of their amortized cost bases, which may be at maturity.
Scheduled contractual maturities of our investment securities at March 31, 2015 were as follows:
	Amortized cost		Fair value
Debt securities:
Within one year	$	115	$	116
After one year through five years	819		839
After five years through ten years	662		667
After ten years	22		22
Total debt securities	1,619		1,644
Mortgage-backed securities	8,751		8,898
Collateralized loan obligations	1,129		1,146
Asset-backed securities	494		504
Other	22		22
	$	12,015	$	12,214
While the contractual maturities of our mortgage-backed securities, collateralized loan obligations, asset-backed securities, and other securities generally exceed ten years, we expect the effective lives to be significantly shorter due to prepayments of the underlying loans and the nature of these securities. The duration of our investment securities portfolio increased to 3.8 years at March 31, 2015 from 3.7 years at December 31, 2014.

Loans_and_Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans and Leases	Loans and Leases
	Overall Portfolio
	Our loan portfolio is made up of two segments, commercial loans and consumer loans. Those segments are further segregated between our loans initially accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired (referred to as “acquired” loans). Our commercial loan portfolio segment includes both business and commercial real estate loans. Our consumer portfolio segment includes residential real estate, home equity, indirect auto, credit cards, and other consumer loans.
	Our loans and leases receivable consisted of the following at the dates indicated:
		31-Mar-15										31-Dec-14
		Originated			Acquired			Total				Originated			Acquired			Total
	Commercial:
	Real estate	$	6,204		$	996		$	7,201			$	6,181		$	1,050		$	7,231
	Construction	1,087			—			1,087				973			1			973
	Business	5,448			343			5,791				5,430			345			5,775
	Total commercial	12,738			1,340			14,078				12,584			1,395			13,979
	Consumer:
	Residential real estate	2,136			1,194			3,330				2,096			1,257			3,353
	Home equity	1,888			1,056			2,944				1,847			1,089			2,936
	Indirect auto	2,201			—			2,201				2,166			—			2,166
	Credit cards	301			—			301				324			—			324
	Other consumer	264			—			264				278			—			278
	Total consumer	6,790			2,250			9,040				6,711			2,347			9,058
	Total loans and leases	19,529			3,590			23,118				19,296			3,742			23,037
	Allowance for loan losses	(224		)	(7		)	(231		)		(228		)	(6		)	(234		)
	Total loans and leases, net	$	19,304		$	3,583		$	22,887			$	19,067		$	3,736		$	22,803
	As of March 31, 2015 and December 31, 2014, we had a liability for unfunded loan commitments of $15 million and $16 million, respectively. For the three months ended March 31, 2015, we recognized a release of provision for credit losses related to our unfunded loan commitments of $1 million. For the three months ended March 31, 2014 we recognized a provision for credit losses related to our unfunded commitments of $0.4 million.
	Of the $2.9 billion home equity portfolio at March 31, 2015 and December 31, 2014, $1.2 billion and $1.1 billion were in a first lien position at each period end, respectively. We hold or service the first lien loan for approximately 10% of the remainder of the home equity portfolio that was in a second lien position as of March 31, 2015 and December 31, 2014.
	Acquired loan portfolios
	We have acquired loans in four acquisitions since January 1, 2009. All acquired loans were initially measured at fair value and subsequently accounted for under either Accounting Standards Codification Topic (“ASC”) 310-30 (Loans and Debt Securities Acquired with Deteriorated Credit Quality) or ASC 310-20 (Nonrefundable Fees and Other Costs.)
	The outstanding principal balance and the related carrying amount of our acquired loans included in our Consolidated Statements of Condition were as follows at the dates indicated:
		March 31,			December 31,
		2015			2014
	Credit impaired acquired loans evaluated individually for future credit losses
	Outstanding principal balance	$	10		$	10
	Carrying amount	5			6
	Acquired loans evaluated collectively for future credit losses
	Outstanding principal balance	2,419			2,549
	Carrying amount	2,367			2,496
	Other acquired loans
	Outstanding principal balance	1,248			1,274
	Carrying amount	1,217			1,240
	Total acquired loans
	Outstanding principal balance	3,677			3,832
	Carrying amount	3,590			3,742
	The following table presents changes in the accretable yield, which includes income recognized from contractual interest cash flows, for the dates indicated. Acquired lines of credit accounted for under ASC 310-20 are not included in this table.
	Balance at January 1, 2014	$	(851	)
	Net reclassifications from nonaccretable yield	(5		)
	Accretion	138
	Other (1)	55
	Balance at December 31, 2014	(663		)
	Accretion	28
	Balance at March 31, 2015	$	(635	)
	(1)	Includes changes in expected cash flows from changes in interest rate and prepayment assumptions.
	During 2014, we reduced our estimate of future cash flows on acquired loans to reflect our current outlook for prepayment speeds on these balances.  The increase in prepayment speed assumptions reduced our accretable discount by $55 million in 2014.  These changes did not materially impact our interest income or net interest margin.
	Allowance for loan losses
	We establish our allowance for loan losses through a provision for credit losses based on our evaluation of the credit quality of our loan portfolio. We determined our allowance for loan losses by portfolio segment as defined above. For our originated loans, our allowance for loan losses consists of the following elements: (i) specific valuation allowances based on probable losses on specifically identified impaired loans; and (ii) valuation allowances based on net historical loan loss experience for similar loans with similar inherent risk characteristics and performance trends, adjusted, as appropriate for qualitative risk factors specific to respective loan types.
	We also maintain an allowance for loan losses on acquired loans when: (i) for loans accounted for under ASC 310-30, there is deterioration in credit quality subsequent to acquisition, and (ii) for loans accounted for under ASC 310-20, the inherent losses in the loans exceed the remaining credit discount recorded at the time of acquisition.
	Beginning in the second quarter of 2014, we raised our threshold for evaluating commercial loans individually for impairment from $200 thousand to $1 million. Impaired loans to commercial borrowers with outstandings less than $1 million are pooled and measured for impairment collectively. Additionally, all loans modified in a troubled debt restructuring ("TDR"), regardless of dollar size, are considered impaired. The impact of this change to our allowance for loan losses was not significant. This change is being implemented on a prospective basis, accordingly, prior period financial disclosures have not been revised.
	The following table presents the activity in our allowance for loan losses on originated loans and related recorded investment of the associated loans in our originated loan portfolio segment for the periods indicated:
		Commercial							Consumer
	Originated loans	Real estate			Business				Residential			Home equity			Indirect auto			Credit cards			Other			Total
																					consumer
	Three months ended March 31, 2015
	Allowance for loan losses:
	Balance at beginning of period	$	65		$	122			$	2		$	8		$	14		$	12		$	5		$	228
	Provision for loan losses	8			—				—			(2		)	2			2			1			11
	Charge-offs	(4		)	(7		)		—			(1		)	(2		)	(3		)	(2		)	(19		)
	Recoveries	—			2				—			—			1			1			—			4
Balance at end of period	$	69		$	117			$	2		$	6		$	14		$	11		$	4		$	224
Allowance for loan losses:
Individually evaluated for impairment	$	5		$	3			$	1		$	—		$	—		$	—		$	—		$	9
Collectively evaluated for impairment	64			115				1			6			14			11			4			215
Total	$	69		$	117			$	2		$	6		$	14		$	11		$	4		$	224
Loans receivable:
Balance at end of period
Individually evaluated for impairment	$	76		$	76			$	22		$	6		$	3		$	—		$	2		$	186
Collectively evaluated for impairment	7,214			5,372				2,114			1,882			2,198			301			261			19,343
Total	$	7,291		$	5,448			$	2,136		$	1,888		$	2,201		$	301		$	264		$	19,529
Three months ended March 31, 2014
Allowance for loan losses:
Balance at beginning of period	$	47		$	120			$	2		$	7		$	10		$	13		$	6		$	205
Provision for loan losses	12			—				—			1			3			2			2			20
Charge-offs	(1		)	(10		)		—			(1		)	(2		)	(3		)	(2		)	(20		)
Recoveries	3			1				—			—			—			—			—			4
Balance at end of period	$	61		$	112			$	2		$	8		$	11		$	12		$	6		$	210
Allowance for loan losses:
Individually evaluated for impairment	$	1		$	2			$	1		$	3		$	—		$	—		$	—		$	7
Collectively evaluated for impairment	59			110				1			5			11			12			6			202
Total	$	61		$	112			$	2		$	8		$	11		$	12		$	6		$	210
Loans receivable:
Balance at end of period
Individually evaluated for impairment	$	60		$	55			$	20		$	6		$	1		$	—		$	2		$	146
Collectively evaluated for impairment	6,515			4,998				1,878			1,598			1,654			306			293			17,242
Total	$	6,575		$	5,053			$	1,898		$	1,605		$	1,655		$	306		$	296		$	17,389
The following table presents the activity in our allowance for loan losses and related recorded investment of the associated loans in our acquired loan portfolio for the periods indicated:
	Commercial							Consumer
Acquired loans	Real estate			Business				Residential			Home equity			Credit cards			Other			Total
																	consumer
Three months ended March 31, 2015
Allowance for loan losses:
Balance at beginning of period	$	1		$	1			$	2		$	2		$	—		$	—		$	6
Provision for loan losses	2			—				—			1			—			—			3
Charge-offs	(2		)	—				—			(1		)	—			—			(3		)
Recoveries	—			—				—			—			—			—			—
Balance at end of period	$	2		$	1			$	2		$	3		$	—		$	—		$	7
Allowance for loan losses:
Individually evaluated for impairment	$	—		$	—			$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment	2			1				2			3			—			—			7
Total	$	2		$	1			$	2		$	3		$	—		$	—		$	7
Loans receivable:
Balance at end of period
Individually evaluated for impairment	$	—		$	3			$	—		$	4		$	—		$	—		$	7
Collectively evaluated for impairment	—			271				—			939			—			—			1,211
Loans acquired with deteriorated credit quality	996			69				1,194			113			—			—			2,372
Total	$	996		$	343			$	1,194		$	1,056		$	—		$	—		$	3,590
Three months ended March 31, 2014
Allowance for loan losses:
Balance at beginning of period	$	—		$	—			$	1		$	3		$	—		$	—		$	4
Provision for loan losses	1			—				—			2			—			—			3
Charge-offs	(1		)	—				—			(2		)	—			—			(3		)
Recoveries	—			—				—			—			—			—			—
Balance at end of period	$	—		$	—			$	1		$	3		$	—		$	—		$	4
Allowance for loan losses:
Individually evaluated for impairment	$	—		$	—			$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment	—			—				1			3			—			—			4
Total	$	—		$	—			$	1		$	3		$	—		$	—		$	4
Loans receivable:
Balance at end of period
Individually evaluated for impairment	$	—		$	7			$	—		$	4		$	—		$	—		$	11
Collectively evaluated for impairment	—			314				—			999			—			—			1,313
Loans acquired with deteriorated credit quality	1,292			95				1,491			160			—			—			3,038
Total	$	1,292		$	417			$	1,491		$	1,162		$	—		$	—		$	4,362
Credit Quality
We monitor credit quality as indicated by various factors and utilize such information in our evaluation of the adequacy of the allowance for loan losses. The following sections discuss the various credit quality indicators that we consider.
Nonperforming loans
Our nonperforming loans consisted of the following at the dates indicated:
	March 31, 2015										December 31, 2014
	Originated			Acquired			Total (1)				Originated			Acquired			Total
Commercial:
Real estate	$	66		$	—		$	66			$	53		$	—		$	53
Business	55			7			61				45			7			53
Total commercial	120			7			127				98			7			106
Consumer:
Residential real estate	33			—			33				34			—			34
Home equity	26			23			49				24			23			47
Indirect auto	13			—			13				13			—			13
Other consumer	5			—			5				5			—			5
Total consumer	77			23			101				75			23			98
Total	$	198		$	30		$	228			$	174		$	30		$	204
(1)	Nonperforming loans do not include $5 million related to a nonperforming loan classified as held for sale as of March 31, 2015, which was sold and for which we received the proceeds on April 2, 2015.
The table below provides information about the interest income that would have been recognized if our nonperforming loans had performed in accordance with terms for the periods indicated:
	Three months ended
	March 31,
	2015			2014
Additional interest income that would have been recorded if nonperforming loans had performed in accordance with original terms	$	3		$	2
Impaired loans
The following table provides information about our impaired originated loans including ending recorded investment, principal balance, and related allowance amount at the dates indicated. Loans with no related allowance for loan losses have adequate collateral securing their carrying value and in some circumstances have been charged down to their current carrying value based on the fair value of the collateral. The recorded investment of our impaired loans, less any related allowance for loan losses, was 69% and 70% of the loans’ unpaid principal balance at March 31, 2015 and December 31, 2014, respectively.
	31-Mar-15										31-Dec-14
Originated loans	Recorded			Unpaid			Related				Recorded			Unpaid			Related
	investment(1)			principal			allowance				investment			principal			allowance
				balance										balance
With no related allowance recorded:
Commercial:
Real estate	$	42		$	62		$	—			$	40		$	59		$	—
Business	49			75			—				29			51			—
Total commercial	90			136			—				69			110			—
Consumer:
Residential real estate	15			17			—				8			9			—
Home equity	4			5			—				3			4			—
Indirect auto	2			3			—				2			3			—
Other consumer	1			1			—				2			2			—
Total consumer	22			28			—				16			18			—
Total	$	113		$	164		$	—			$	85		$	128		$	—
With a related allowance recorded:
Commercial:
Real estate	$	35		$	41		$	5			$	24		$	27		$	2
Business	27			40			3				32			43			2
Total commercial	62			80			8				56			70			4
Consumer:
Residential real estate	7			7			1				11			13			1
Home equity	2			2			—				4			4			1
Indirect auto	1			1			—				—			—			—
Other consumer	1			1			—				—			—			—
Total consumer	11			11			1				16			17			2
Total	$	73		$	91		$	9			$	71		$	87		$	6
Total
Commercial:
Real estate	$	76		$	102		$	5			$	64		$	86		$	2
Business	76			114			3				61			93			2
Total commercial	152			217			8				125			179			4
Consumer:
Residential real estate	22			24			1				20			22			1
Home equity	6			7			—				7			8			1
Indirect auto	3			4			—				2			3			—
Other consumer	2			3			—				2			2			—
Total consumer	33			38			1				31			36			2
Total	$	186		$	255		$	9			$	156		$	215		$	6
(1)	Impaired loans do not include $5 million related to a nonperforming loan classified as held for sale as of March 31, 2015, which was sold and for which we received the proceeds on April 2, 2015.
The following table provides information about our impaired acquired loans with no related allowance at the dates indicated. The remaining credit mark is considered adequate to cover any loss on these balances.
	31-Mar-15										31-Dec-14
Acquired loans	Recorded			Unpaid			Related				Recorded			Unpaid principal balance			Related
	investment			principal			allowance				investment						allowance
				balance
Commercial:
Real estate	$	—		$	—		$	—			$	—		$	—		$	—
Business	3			3			—				3			3			—
Total commercial	3			3			—				3			3			—
Consumer:
Residential real estate	—			—			—				—			—			—
Home equity	4			5			—				4			6			—
Other consumer	—			—			—				—			—			—
Total consumer	4			5			—				4			6			—
Total(1)	$	7		$	8		$	—			$	7		$	9		$	—
-1	Includes nonperforming purchased credit impaired loans.
The following table provides information about our impaired originated loans including the average recorded investment and interest income recognized on impaired loans for the periods indicated:
	March 31,
	2015							2014
Originated loans	Average			Interest				Average			Interest
	recorded			income				recorded			income
	investment			recognized				investment			recognized
Three months ended March 31,
Commercial:
Real estate	$	77		$	—			$	62		$	—
Business	78			—				55			—
Total commercial	155			1				117			1
Consumer:
Residential real estate	22			—				20			—
Home equity	6			—				6			—
Indirect auto	3			—				2			—
Other consumer	3			—				2			—
Total consumer	33			—				31			—
Total	$	189		$	1			$	148		$	1
The following table provides information about our impaired acquired loans including the average recorded investment and interest income recognized on impaired loans for the periods indicated:
	March 31,
	2015							2014
Acquired loans	Average			Interest				Average			Interest
	recorded			income				recorded			income
	investment			recognized				investment			recognized
Three months ended March 31,
Commercial:
Real estate	$	—		$	—			$	—		$	—
Business	3			—				8			—
Total commercial	3			—				8			—
Consumer:
Residential real estate	—			—				—			—
Home equity	4			—				4			—
Other consumer	—			—				—			—
Total consumer	4			—				4			—
Total(1)	$	7		$	—			$	11		$	—
-1	Includes nonperforming purchased credit impaired loans.
Period end nonperforming loans differed from the amount of total impaired loans as certain TDRs, which are considered impaired loans, were accruing interest because the borrower demonstrated its ability to satisfy the terms of the restructured loan for at least six consecutive payments. Also contributing to the difference are nonperforming commercial loans less than $1 million and nonperforming consumer loans, which are not considered impaired unless they have been modified in a TDR as they are evaluated collectively when determining the allowance for loan losses.
The following table is a reconciliation between nonperforming loans and impaired loans at the dates indicated:
	Commercial			Consumer			Total
31-Mar-15
Nonperforming loans	$	127		$	101		$	228
Plus: Accruing TDRs	56			8			64
Less: Smaller balance nonperforming loans evaluated collectively when determining the allowance for loan losses	(28		)	(72		)	(100		)
Total impaired loans(1)	$	155		$	37		$	192
December 31, 2014:
Nonperforming loans	$	106		$	98		$	204
Plus: Accruing TDRs	59			8			67
Less: Smaller balance nonperforming loans evaluated collectively when determining the allowance for loan losses	(36		)	(71		)	(108		)
Total impaired loans(1)	$	128		$	35		$	163
(1)	Includes nonperforming purchased credit impaired loans.
Credit Quality Indicators
The primary indicators of credit quality are delinquency status and our internal loan gradings for our commercial loan portfolio segment and delinquency status and current FICO scores for our consumer loan portfolio segment.
The following tables contain an aging analysis of our loans by class at the dates indicated:
	30-59 days			60-89 days			Greater			Total			Current			Total loans			Greater than
	past due			past due			than			past due						receivable			90 days
							90 days												and accruing (1)
							past due
31-Mar-15
Originated loans
Commercial:
Real estate	$	6		$	5		$	34		$	45		$	7,246		$	7,291		$	—
Business	19			2			14			36			5,412			5,448			—
Total commercial	26			7			48			80			12,658			12,738			—
Consumer:
Residential real estate	5			1			19			25			2,111			2,136			—
Home equity	3			1			16			20			1,868			1,888			—
Indirect auto	13			2			5			21			2,180			2,201			—
Credit cards	1			1			3			5			296			301			3
Other consumer	2			1			3			6			258			264			—
Total consumer	25			7			45			77			6,713			6,790			3
Total	$	50		$	13		$	94		$	157		$	19,371		$	19,529		$	3
Acquired loans
Commercial:
Real estate	$	4		$	2		$	24		$	29		$	967		$	996		$	24
Business	1			1			7			8			335			343			4
Total commercial	4			2			30			37			1,303			1,340			27
Consumer:
Residential real estate	11			5			52			68			1,126			1,194			52
Home equity	5			3			20			28			1,027			1,056			5
Total consumer	17			8			72			96			2,154			2,250			57
Total	$	21		$	10		$	102		$	133		$	3,456		$	3,590		$	84
	30-59 days			60-89 days			Greater			Total			Current			Total loans			Greater than
	past due			past due			than			past due						receivable			90 days
							90 days												and accruing (1)
							past due
31-Dec-14
Originated loans
Commercial:
Real estate	$	7		$	2		$	31		$	40		$	7,113		$	7,154		$	—
Business	5			7			17			28			5,402			5,430			—
Total commercial	11			9			49			69			12,515			12,584			—
Consumer:
Residential real estate	4			2			21			27			2,069			2,096			—
Home equity	3			1			15			19			1,828			1,847			—
Indirect auto	17			4			5			27			2,139			2,166			—
Credit cards	2			2			2			6			318			324			2
Other consumer	3			1			3			7			271			278			—
Total consumer	29			10			46			85			6,626			6,711			2
Total	$	41		$	19		$	95		$	154		$	19,141		$	19,296		$	2
Acquired loans
Commercial:
Real estate	$	3		$	3		$	26		$	31		$	1,019		$	1,050		$	26
Business	—			—			7			7			338			345			4
Total commercial	3			3			33			38			1,357			1,395			30
Consumer:
Residential real estate	11			5			56			72			1,186			1,257			56
Home equity	6			2			21			29			1,060			1,089			6
Total consumer	17			7			77			101			2,246			2,347			62
Total	$	21		$	9		$	109		$	139		$	3,603		$	3,742		$	91
(1)	Includes credit card loans, loans that have matured and are in the process of collection, and acquired loans that were originally recorded at fair value upon acquisition. Acquired loans are considered to be accruing as we can reasonably estimate future cash flows on these acquired loans and we expect to fully collect the carrying value of these loans net of the allowance for acquired loan losses. Therefore, we are accreting the difference between the carrying value of these loans and their expected cash flows into interest income.
Our internal loan risk assessment provides information about the financial health of our commercial borrowers and our risk of potential loss. The following tables present information about the credit quality of our commercial loan portfolio at the dates indicated:
	Real estate			Business			Total			Percent of total
31-Mar-15
Originated loans:
Pass	$	6,936		$	5,122		$	12,058		94.7	%
Criticized:(1)(2)
Accrual	290			271			560			4.4
Nonaccrual	66			55			120			0.9
Total criticized	355			325			680			5.3
Total	$	7,291		$	5,448		$	12,738		100	%
Acquired loans:
Pass	$	895		$	295		$	1,190		88.8	%
Criticized:(1)
Accrual	101			42			143			10.7
Nonaccrual	—			7			7			0.5
Total criticized	101			49			150			11.2
Total	$	996		$	343		$	1,340		100	%
31-Dec-14
Originated loans:
Pass	$	6,791		$	5,067		$	11,858		94.2	%
Criticized:(1)
Accrual	310			318			628			5
Nonaccrual	53			45			98			0.8
Total criticized	363			363			726			5.8
Total	$	7,154		$	5,430		$	12,584		100	%
Acquired loans:
Pass	$	948		$	294		$	1,243		89.1	%
Criticized:(1)
Accrual	102			43			145			10.4
Nonaccrual	—			7			7			0.5
Total criticized	102			51			153			10.9
Total	$	1,050		$	345		$	1,395		100	%
(1)	Includes special mention, substandard, doubtful, and loss, which are consistent with regulatory definitions, and as described in Item 1, “Business,” under “Asset Quality Review” in our Annual Report on 10-K for the year ended December 31, 2014.
(2)	Criticized loans do not include $5 million related to a nonperforming loan classified as held for sale as of March 31, 2015, which was sold and for which we received the proceeds on April 2, 2015.
Borrower FICO scores provide information about the credit quality of our consumer loan portfolio as they provide an indication as to the likelihood that a debtor will repay their debts. The scores are obtained from a nationally recognized consumer rating agency and are presented in the table below at the dates indicated:
	Residential			Home equity			Indirect auto			Credit cards			Other			Total			Percent of
	real estate												consumer						total
31-Mar-15
Originated loans by refreshed FICO score:
Over 700	$	1,880		$	1,553		$	1,552		$	206		$	168		$	5,359		78.9	%
660-700	128			184			345			51			45			752			11.1
620-660	55			77			162			24			25			344			5
580-620	33			35			68			10			12			158			2.3
Less than 580	35			37			74			8			13			167			2.5
No score(1)	6			2			—			2			1			11			0.2
Total	$	2,136		$	1,888		$	2,201		$	301		$	264		$	6,790		100	%
Acquired loans by refreshed FICO score:
Over 700	$	809		$	821		$	—		$	—		$	—		$	1,630		72.5	%
660-700	93			95			—			—			—			188			8.4
620-660	58			50			—			—			—			107			4.8
580-620	53			38			—			—			—			91			4
Less than 580	60			35			—			—			—			95			4.2
No score(1)	121			17			—			—			—			139			6.1
Total	$	1,194		$	1,056		$	—		$	—		$	—		$	2,250		100	%
31-Dec-14
Originated loans by refreshed FICO score:
Over 700	$	1,841		$	1,529		$	1,533		$	226		$	167		$	5,296		78.9	%
660-700	124			182			347			53			46			752			11.2
620-660	62			71			159			24			24			339			5
580-620	28			31			64			11			13			148			2.2
Less than 580	32			32			63			8			12			146			2.2
No score(1)	9			1			—			3			17			31			0.5
Total	$	2,096		$	1,847		$	2,166		$	324		$	278		$	6,711		100	%
Acquired loans by refreshed FICO score:
Over 700	$	872		$	851		$	—		$	—		$	—		$	1,723		73.4	%
660-700	87			93			—			—			—			180			7.7
620-660	61			52			—			—			—			113			4.8
580-620	49			40			—			—			—			88			3.8
Less than 580	57			34			—			—			—			91			3.9
No score(1)	131			20			—			—			—			151			6.4
Total	$	1,257		$	1,089		$	—		$	—		$	—		$	2,347		100	%
(1)	Primarily includes loans that are serviced by others for which refreshed FICO scores were not available as of the date indicated.
Troubled Debt Restructures
The following table details additional information about our TDRs at the dates indicated:
	March 31,			December 31,
	2015			2014
Aggregate recorded investment of impaired loans with terms modified through a troubled debt restructuring:
Accruing interest	$	64		$	67
Nonaccrual	54			53
Total troubled debt restructurings (1)	$	119		$	120
(1)	Includes 93 and 87 acquired loans that were restructured with a recorded investment of $4 million and $4 million at March 31, 2015 and December 31, 2014, respectively.
The modifications made to loans classified as TDRs typically consist of an extension of the payment terms, providing for a period with interest-only payments with deferred principal payments, rate reduction, or loans restructured in a Chapter 7 bankruptcy. We generally do not forgive principal when restructuring loans.
The financial effects of our modifications are as follows for the periods indicated:
Type of Concession	Count		Postmodification			Premodification			Postmodification
			recorded			allowance for			allowance for
			investment(1)			loan losses			loan losses
Three months ended March 31, 2015
Commercial:
Commercial business
Rate reduction	2		—			—			—
Total commercial	2		—			—			—
Consumer:
Residential real estate
Extension of term	7		1			—			—
Extension of term and rate reduction	4		1			—			—
Chapter 7 bankruptcy	5		1			—			—
Home equity
Extension of term	1		—			—			—
Extension of term and rate reduction	1		—			—			—
Chapter 7 Bankruptcy	23		1			—			—
Indirect auto
Chapter 7 Bankruptcy	53		1			—			—
Other consumer
Chapter 7 Bankruptcy	2		—			—			—
Total consumer	96		5			—			—
Total	98		$	5		$	—		$	—
Three months ended March 31, 2014
Commercial:
Commercial real estate
Extension of term and rate reduction	1		—			—			—
Commercial business
Extension of term	2		3			—			—
Total commercial	3		3			—			—
Consumer:
Residential real estate
Extension of term	2		—			—			—
Deferral of principal and extension of term	1		—			—			—
Extension of term and rate reduction	4		—			—			—
Chapter 7 Bankruptcy	8		1			—			—
Home equity
Deferral of principal and extension of term	2		—			—			—
Chapter 7 Bankruptcy	33		1			—			—
Indirect auto
Chapter 7 Bankruptcy	86		1			—			—
Total consumer	136		4			—			—
Total	139		$	7		$	—		$	—
(1)Postmodification balances approximate premodification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant.
The recorded investment in loans modified as TDRs within 12 months of the balance sheet date and for which there was a payment default was not significant for the three months ended March 31, 2015 and 2014, respectively.
Residential Mortgage Banking
The following table provides information about our residential mortgage banking activities at the dates indicated:
	March 31,
	2015			2014
Mortgages serviced for others	$	3,869		$	3,713
Mortgage servicing asset recorded for loans serviced for others, net	37			36

Goodwill_Goodwill

Goodwill Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill Disclosure [Text Block]	Goodwill
	The following table shows information regarding our goodwill for the year ended December 31, 2014. There was no activity in our goodwill during the three months ended March 31, 2015.
		Banking			Financial		Consolidated
					services		total
	Balances at January 1, 2014	$	2,381		$	68	$	2,449
	Acquisitions	—			1		1
	Impairment	(1,100		)	—		(1,100		)
	Balances at December 31, 2014	$	1,281		$	69	$	1,350
	We perform our annual impairment test of goodwill on November 1st of each year or more often if events or circumstances have changed significantly from the annual test date.
	For the period ending September 30, 2014, we concluded it was more likely than not that the fair value of our Banking reporting unit was less than its carrying value including goodwill, given our current expectations regarding the macroeconomic and industry environment, including our view of future interest rates and our current stock price range. Accordingly, we performed a Step 1 review for possible goodwill impairment in advance of our annual impairment testing date.
	Under Step 1 of the goodwill impairment review, we calculated the fair value of the Banking reporting unit using a market approach, and compared the fair value to carrying value to identify potential impairment. Under Step 1, we determined that the carrying value of our Banking reporting unit exceeded its fair value. For Step 2, we compared the implied fair value of the Banking reporting unit's goodwill with the carrying amount of the goodwill for the Banking reporting unit.
	Based on our assessments under both Steps 1 and 2, we have recorded an impairment of our Banking reporting unit goodwill of $1.1 billion during the quarter ended September 30, 2014. When we performed our annual goodwill impairment assessment as of November 1, 2014, we concluded that our goodwill balance was not impaired.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	We are a party to derivative financial instruments in the normal course of business to manage our own exposure to fluctuations in interest rates and to meet the needs of our customers. These financial instruments have been limited to interest rate swap agreements, which are entered into with counterparties that meet established credit standards and, where appropriate, contain master netting and collateral provisions protecting the party at risk. We believe that the credit risk inherent in all of our derivative contracts is minimal based on our credit standards and the netting and collateral provisions of the interest rate swap agreements.
	Our derivative positions include both instruments that are designated as hedging instruments and instruments that are customer related and not designated in hedging relationships. The following table presents information regarding our derivative financial instruments at the dates indicated:
		Asset derivatives						Liability derivatives
		Notional			Fair value  (1)			Notional		Fair value  (2)
		amount						amount
	31-Mar-15
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	$	3		$	—		$	230	$	4
	Derivatives not designated as hedging instruments:
	Interest rate swap agreements	3,830			138			3,836		139
	Total derivatives	$	3,833		$	138		$	4,065	$	142
	31-Dec-14
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	$	4		$	—		$	30	$	2
	Derivatives not designated as hedging instruments:
	Interest rate swap agreements	3,629			96			3,649		96
	Total derivatives	$	3,633		$	96		$	3,679	$	97
	(1)	Represents gross amounts, included in Other Assets in our Consolidated Statements of Condition.
	(2)	Represents gross amounts, included in Other Liabilities in our Consolidated Statements of Condition.
	At March 31, 2015, all of our interest rate swaps for which we had master netting positions with the counterparty were in a liability position. Accordingly, there was no offsetting in our Consolidated Statement of Financial Condition at March 31, 2015. Interest rate swaps for which we had master netting arrangements with the counterparty at December 31, 2014 were in a net liability position $93 million. We offset $96 million of liabilities with $3 million of assets in our Consolidated Statement of Financial Condition at December 31, 2014 related to these interest rate swaps and we did not include any cash collateral in the netting. We posted collateral for liability positions with a fair value of $227 million and $130 million at March 31, 2015 and December 31, 2014, respectively.
	Derivatives designated in hedging relationships
	We designate interest rate swap agreements used to manage changes in the fair value of loans due to interest rate changes as fair value hedges. We have designated the risk of changes in the fair value of loans attributable to changes in the benchmark rate as the hedged risk. Accordingly, changes to the fair value of the hedged items attributable to a change in credit risk are excluded from our assessment of hedge effectiveness. The change in fair value of the derivatives, including both the effective and ineffective portions, is recognized in earnings and, so long as our fair value hedging relationships remain highly effective, such change is offset by the gain or loss due to the change in fair value of the loans attributable to the hedged risk. The net impact of the fair value hedging relationships on net income was not significant for the three months ended March 31, 2015 and 2014.
	We have entered into forward starting interest rate swaps to reduce our exposure to variability in interest-related cash outflows attributable to changes in forecasted LIBOR based borrowings. These derivative instruments are designated as cash flow hedges. We have designated the risk of changes in the amount of interest payment cash flows to be made during the term of the borrowings attributable to changes in the benchmark rate as the hedged risk. Accordingly, changes to the amount of interest payment cash flows for the hedged transactions attributable to a change in credit risk are excluded from our assessment of hedge effectiveness. Our interest rate swaps designated as cash flow hedges have maturities that correspond to the maturity of the forecasted hedged borrowing. Any gain or loss associated with the effective portion of our cash flow hedges is recognized in other comprehensive income and is subsequently reclassified into earnings in the period during which the hedged forecasted transactions affects earnings. Any gain or loss associated with the ineffective portion of our cash flow hedges, including ineffectiveness, is recognized immediately in earnings. At March 31, 2015, there was a $1 million loss recognized in accumulated other comprehensive income related to these swaps.
	At March 31, 2015, there was a $5 million loss recognized in accumulated other comprehensive income related to borrowings that were previously hedged using interest rate swaps that were classified as cash flow hedges. This amount will be reclassified out of accumulated other comprehensive income and into earnings over the remaining life of the hedged borrowings as an adjustment of yield.
	The following table presents certain information about amounts recognized for our derivative financial instruments designated in cash flow hedging relationships for the periods indicated.
		Three months ended March 31,
	Cash Flow Hedges	2015				2014
	Interest rate swap agreements:
	Amount of (loss) gain on derivatives recognized in other comprehensive income, net of tax	$	(1	)		$	—
	Derivatives not designated in hedging relationships
	In addition to our derivatives designated in hedging relationships, we act as an interest rate swap counterparty for certain commercial borrowers in the normal course of servicing our customers, which are accounted for at fair value. We manage our exposure to such interest rate swaps by entering into corresponding and offsetting interest rate swaps with third parties that mirror the terms of the interest rate swaps we have with the commercial borrowers. These positions (referred to as “customer swaps”) directly offset each other and our exposure is the positive fair value of the derivatives due to changes in credit risk of our commercial borrowers and third parties. We recognized revenue for this service that we provide our customers of $3 million and $2 million for the three months ended March 31, 2015 and 2014, respectively, included in Capital Markets income in our Consolidated Statements of Income.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	The following table is a computation of our basic and diluted earnings per share using the two-class method for the periods indicated:
		Three months ended March 31,
		2015			2014
	Net income available to common stockholders	$	44		$	53
	Less income allocable to unvested restricted stock awards	—			—
	Net income allocable to common stockholders	$	44		$	52
	Weighted average common shares outstanding:
	Total shares issued	366			366
	Unallocated employee stock ownership plan shares	—			(2		)
	Unvested restricted stock awards	(3		)	(2		)
	Treasury shares	(13		)	(12		)
	Total basic weighted average common shares outstanding	351			350
	Effect of dilutive stock-based awards	2			2
	Total diluted weighted average common shares outstanding	353			351
	Basic earnings per common share	$	0.12		$	0.15
	Diluted earnings per common share	$	0.12		$	0.15
	Anti-dilutive stock-based awards excluded from the diluted weighted average common share calculations	11			11

Other_Comprehensive_Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Other Comprehensive Income	Other Comprehensive income
	The following table presents the activity in our Other Comprehensive Income for the periods indicated:
		Three months ended March 31,
		Pretax			Income			Net
					taxes
	2015
	Securities available for sale:
	Net unrealized holding gains arising during the period	$	26		$	10		$	16
	Net unrealized holding gains on securities transferred between available for sale and held to maturity:
	Amortization of net unrealized holding gains to income during the period	(2		)	(1		)	(2		)	(1)
	Interest rate swaps designated as cash flow hedges:
	Net unrealized losses arising during the period	(2		)	(1		)	(1		)
	Net unrealized losses on interest rate swaps designated as cash flow hedges	(1		)	(1		)	(1		)
	Amortization of net loss related to pension and post-retirement plans	1			—			1
	Total other comprehensive income	$	23		$	8		$	15
	2014
	Securities available for sale:
	Net unrealized holding gains arising during the year	$	14		$	5		$	9
	Net unrealized holding gains on securities transferred between available for sale and held to maturity:
	Amortization of net unrealized holding gains to income during the year	(3		)	(1		)	(2		)	(1)
	Total other comprehensive income	$	11		$	4		$	7
	(1)	Included in Interest income on investment securities and other in our Consolidated Statements of Income.
	The following table presents the activity in our accumulated other comprehensive income for the periods indicated:
		Net unrealized gains on securities available for sale			Net unrealized gains (losses) on			Unrealized loss on			Pension and postretirement plans			Total
					securities transferred from			interest rate
					available for sale to			swaps designated as
					held to maturity			cash flow hedges
	Balance, January 1, 2015	$	52		$	12		$	(5	)	$	(51	)	$	9
	Period change, net of tax	16			(2		)	(1		)	1			15
	Balance, March 31, 2015	$	68		$	11		$	(6	)	$	(50	)	$	23
	Balance, January 1, 2014	$	64		$	20		$	(6	)	$	(16	)	$	62
	Period change, net of tax	9			(2		)	—			—			7
	Balance, March 31, 2014	$	73		$	18		$	(5	)	$	(16	)	$	69
	During the next twelve months, we expect to reclassify $1 million of pre-tax net loss on previous cash flow hedges from accumulated other comprehensive income to earnings.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Current accounting guidance establishes a fair value hierarchy based on the transparency of inputs participants use to price an asset or liability. The fair value hierarchy prioritizes these inputs into the following three levels:
	Level 1 Inputs—Unadjusted quoted prices in active markets for identical assets or liabilities that are available at the measurement date.
	Level 2 Inputs—Inputs, other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.), or inputs that are derived principally from or corroborated by market data through correlation or other means.
	Level 3 Inputs—Unobservable inputs for determining the fair value of the asset or liability and are based on the entity’s own estimates about the assumptions that market participants would use to price the asset or liability.
	A financial instrument’s categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.
	Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While we believe our valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	Securities Available for Sale
	The fair value estimates of available for sale securities are based on quoted market prices of identical securities, where available (Level 1). However, as quoted prices of identical securities are not often available, the fair value estimate for almost our entire investment portfolio is based on quoted market prices of similar securities, adjusted for differences between the securities (Level 2). Adjustments may include amounts to reflect differences in underlying collateral, interest rates, estimated prepayment speeds, and counterparty credit quality. Where sufficient information is not available from the pricing services to produce a reliable valuation, we estimate fair value based on either broker quotes or internally developed models. We determine the fair value using third party pricing services, including brokers. As of March 31, 2015, none of our investment securities were priced utilizing broker quotes. For details regarding our pricing process and sources, refer to Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Income-Critical Accounting Policies and Estimates.”
	Loans held for sale
	We have elected the fair value option for certain residential real estate loans held for sale as we believe the fair value measurement of such loans reduces certain timing differences in our Statement of Income and better aligns with our management of the portfolio from a business perspective. This election is made at the time of origination, on a loan by loan basis, and is irrevocable. The secondary market for securities backed by similar loan types is actively traded, which provides readily observable market pricing to be used as input for the estimate for the fair value of our loans. Accordingly, we have classified this fair value measurement as Level 2. Interest income on these loans is recognized in Interest Income—Loans and Leases in our Consolidated Statements of Income.
	The table below presents information about our loans held for sale for which we elected the fair value option at the dates indicated:
		March 31,		December 31,
		2015		2014
	Fair value carrying amount	$	40	$	35
	Aggregate unpaid principal balance	39		34
	Fair value carrying amount less aggregate unpaid principal balance	$	1	$	1
	Additionally, included in loans held for sale on our Consolidated Statements of Condition are $8 million and $5 million of commercial loans held for sale that are carried at the lower of cost or market at March 31, 2015 and December 31, 2014, respectively.
	Derivatives
	We obtain fair value measurements of our interest rate swaps from a third party. The fair value measurements are determined using a market standard methodology of netting discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). Variable cash payments (or receipts) are based on an expectation of future interest rates derived from observable market interest rate curves. Credit valuation adjustments are incorporated to appropriately reflect our nonperformance risk as well as the counterparty’s nonperformance risk. The impact of netting and any applicable credit enhancements, such as bilateral collateral postings, thresholds, mutual puts, and guarantees are also considered in the fair value measurement.
	The fair value of our interest rate swaps was estimated using primarily Level 2 inputs. However, Level 3 inputs were used to determine credit valuation adjustments, such as estimates of current credit spreads to evaluate the likelihood of default. We have determined that the impact of these credit valuation adjustments was not significant to the overall valuation of our interest rate swaps. Therefore, we have classified the entire fair value of our interest rate swaps in Level 2 of the fair value hierarchy.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following tables summarize our assets and liabilities measured at fair value on a recurring basis at the dates indicated:
		Fair Value Measurements
		Total		Level 1		Level 2			Level 3
	31-Mar-15
	Assets:
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	435	$	—	$	435		$	—
	U.S. Treasury	55		55		—			—
	U.S. government sponsored enterprises	275		—		275			—
	Corporate	833		—		829			4
	Total debt securities	1,599		55		1,539			4
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	33		—		33			—
	Federal National Mortgage Association	94		—		94			—
	Federal Home Loan Mortgage Corporation	112		—		112			—
	Collateralized mortgage obligations:
	Federal National Mortgage Association	668		—		668			—
	Federal Home Loan Mortgage Corporation	337		—		337			—
	Total collateralized mortgage obligations	1,006		—		1,006			—
	Total residential mortgage-backed securities	1,244		—		1,244			—
	Commercial mortgage-backed securities, non-agency issued	1,397		—		1,397			—
	Total mortgage-backed securities	2,641		—		2,641			—
	Collateralized loan obligations, non-agency issued	1,146		—		1,146			—
	Asset-backed securities collateralized by:
	Student loans	230		—		230			—
	Credit cards	43		—		43			—
	Auto loans	149		—		149			—
	Other	83		—		83			—
	Total asset-backed securities	504		—		504			—
	Other	22		21		1			—
	Total securities available for sale	5,911		77		5,830			4
	Loans held for sale (1)	40		—		40			—
	Derivatives	138		—		138			—
	Total assets	$	6,090	$	77	$	6,008		$	4
	Liabilities:
	Derivatives	$	142	$	—	$	142		$	—
	(1)	Represents loans for which we have elected the fair value option.
		Fair Value Measurements
		Total		Level 1		Level 2			Level 3
31-Dec-14
Assets:
Investment securities available for sale:
Debt securities:
States and political subdivisions	$	453	$	—	$	453		$	—
U.S. Treasury	25		25		—			—
U.S. government sponsored enterprises	191		—		191			—
Corporate	823		—		818			4
Total debt securities	1,492		25		1,463			4
Mortgage-backed securities:
Residential mortgage-backed securities:
Government National Mortgage Association	34		—		34			—
Federal National Mortgage Association	100		—		100			—
Federal Home Loan Mortgage Corporation	120		—		120			—
Collateralized mortgage obligations:
Federal National Mortgage Association	682		—		682			—
Federal Home Loan Mortgage Corporation	350		—		350			—
Total collateralized mortgage obligations	1,032		—		1,032			—
Total residential mortgage-backed securities	1,286		—		1,286			—
Commercial mortgage-backed securities, non-agency issued	1,500		—		1,500			—
Total mortgage-backed securities	2,786		—		2,786			—
Collateralized loan obligations, non-agency issued	1,016		—		1,016			—
Asset-backed securities collateralized by:
Student loans	235		—		235			—
Credit cards	42		—		42			—
Auto loans	194		—		194			—
Other	127		—		127			—
Total asset-backed securities	599		—		599			—
Other	22		21		1			—
Total securities available for sale	5,915		47		5,865			4
Loans held for sale (1)	35		—		35			—
Derivatives	93		—		93			—
Total assets	$	6,043	$	47	$	5,993		$	4
Liabilities:
Derivatives	$	94	$	—	$	94		$	—
(1)	Represents loans for which we have elected the fair value option.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
The following table summarizes our assets and liabilities measured at fair value on a nonrecurring basis for the periods indicated:
	Fair Value Measurements										Total gains
	Total		Level 1		Level 2			Level 3			(losses)
Three months ended March 31, 2015
Collateral dependent impaired loans	$	18	$	—	$	9		$	9		$	(2	)
Three months ended March 31, 2014
Collateral dependent impaired loans	$	26	$	—	$	20		$	6		$	(2	)
Collateral Dependent Impaired Loans
We record nonrecurring fair value adjustments to the carrying value of collateral dependent impaired loans when establishing the allowance for loan losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan less estimated costs to sell the collateral. When the fair value of such collateral, less costs to sell, is less than the carrying value of the loan, a specific allowance or charge off is recorded through a provision for credit losses. Real estate collateral is typically valued using independent appraisals that we review for acceptability, or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurements have been classified as Level 2. Under certain circumstances significant adjustments may be made to the appraised value due to the lack of direct marketplace information. Such adjustments are made as determined necessary in the judgment of our experienced senior credit officers to reflect current market conditions and current operating results for the specific collateral. When the fair value of collateral dependent impaired loans is based on appraisals containing significant adjustments, such collateral dependent impaired loans are classified as Level 3. We obtain new appraisals from an approved appraiser, in accordance with Interagency Appraisal and Evaluation Guidelines and internal policy. Appraisals or evaluations for assets securing substandard rated loans are usually completed within 90 days of the downgrade. An appraisal may be obtained more frequently when volatile or unusual market conditions exist that could affect the ultimate realization of the value of the real estate collateral.
During the three months ended March 31, 2015, we recorded an increase of $2 million to our specific allowance as a result of adjusting the fair value of the collateral for certain collateral dependent impaired loans to $18 million at March 31, 2015, which is included in our provision for credit losses. During the three months ended March 31, 2014 we recorded an increase of $2 million to our specific allowance as a result of adjusting the fair value of the collateral for certain collateral dependent impaired loans to $26 million at March 31, 2014, which is included in our provision for credit losses.
Level 3 Assets
Due to the lack of observable market data, we have classified our trust preferred securities, which are included in corporate debt securities and amounted to $4 million at March 31, 2015 and December 31, 2014, in Level 3 of the fair value hierarchy. There no changes in our trust preferred securities during the three months ended March 31, 2015 and 2014. As of March 31, 2015 and December 31, 2014, the fair values of our trust preferred securities are based upon third party pricing without adjustment.
Fair Value of Financial Instruments
The carrying value and estimated fair value of our financial instruments, including those that are not measured and reported at fair value on a recurring basis or nonrecurring basis, at the dates indicated are as follows:
	31-Mar-15								31-Dec-14
	Carrying value		Estimated fair		Fair value				Carrying value			Estimated fair		Fair value
			value		level							value		level
Financial assets:
Cash and cash equivalents	$	388	$	388	1				$	420		$	420	1
Investment securities available for sale	5,911		5,911		1,2,3		(1)		5,915			5,915		1,2,3	(1)
Investment securities held to maturity	6,215		6,302		2				5,942			5,964		2
Federal Home Loan Bank and Federal Reserve Bank common stock	375		375		2				412			412		2
Loans held for sale	49		49		2				40			40		2
Loans and leases, net	22,887		23,167		2,3		(2)		22,803			23,037		2,3	(2)
Derivatives	138		138		2				93			93		2
Accrued interest receivable	105		105		2				101			101		2
Financial liabilities:
Deposits	$	28,250	$	28,265	2				$	27,781		$	27,793	2
Borrowings	5,973		5,985		2				6,206			6,215		2
Derivatives	142		142		2				94			94		2
Accrued interest payable	12		12		2				11			11		2
(1)	For a detailed breakout of our investment securities available for sale, refer to our table of recurring fair value measurements.
(2)	Loans and leases classified as level 2 are made up of $9 million and $10 million of collateral dependent impaired loans without significant adjustments made to appraised values at March 31, 2015 and December 31, 2014, respectively. All other loans and leases are classified as level 3.
Our fair value estimates are based on our existing on and off balance sheet financial instruments without attempting to estimate the value of any anticipated future business and the value of assets and liabilities that are not considered financial instruments. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on our fair value estimates and have not been considered in these estimates.
Our fair value estimates are made as of the dates indicated, based on relevant market information and information about the financial instruments, including our judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in our assumptions could significantly affect the estimates. Our fair value estimates, methods, and assumptions are set forth below for each type of financial instrument. The method of estimating the fair value of the financial instruments disclosed in the table above does not necessarily incorporate the exit price concept used to record financial instruments at fair value in our Consolidated Statements of Condition or when measuring goodwill for impairment.
Cash and Cash Equivalents
The carrying value of our cash and cash equivalents approximates fair value because these instruments have original maturities of three months or less.
Investment Securities
The fair value estimates of securities are based on quoted market prices of identical securities, where available. However, as quoted prices of identical securities are not often available, the fair value estimate for almost our entire investment portfolio is based on quoted market prices of similar securities, adjusted for differences between the securities. Adjustments may include amounts to reflect differences in underlying collateral, interest rates, estimated prepayment speeds, and counterparty credit quality.
Federal Home Loan Bank and Federal Reserve Bank Common Stock
The carrying value of our Federal Home Loan Bank and Federal Reserve Bank common stock, which are non-marketable equity investments, approximates fair value.
Loans and Leases
Our variable rate loans reprice as the associated rate index changes. The calculation of fair value for our variable rate loans is driven by the comparison between the loan’s margin and the prevailing margin observed in the market at the time of the valuation. Any caps and floors embedded in the loan’s pricing structure are also incorporated into the fair value. We calculated the fair value of our fixed-rate loans and leases by discounting scheduled cash flows through the estimated maturity using credit adjusted period end origination rates. Our estimate of maturity is based on the contractual cash flows adjusted for prepayment estimates based on current economic and lending conditions.
Accrued Interest Receivable and Accrued Interest Payable
The carrying value of accrued interest receivable and accrued interest payable approximates fair value.
Deposits
The fair value of our deposits with no stated maturity, such as savings and checking, as well as mortgagors’ payments held in escrow, is equal to the amount payable on demand. The fair value of our certificates of deposit is based on the discounted value of contractual cash flows, using the period end rates offered for deposits of similar remaining maturities.
Borrowings
The fair value of our borrowings is calculated by discounting scheduled cash flows through the estimated maturity using period end market rates for borrowings of similar remaining maturities.
Commitments
The fair value of our commitments to extend credit, standby letters of credit, and financial guarantees are not included in the above table as the carrying value generally approximates fair value. These instruments generate fees that approximate those currently charged to originate similar commitments.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information
	We have two business segments: banking and financial services. The banking segment includes all of our retail and commercial banking operations. The financial services segment includes our insurance operations. Substantially all of our assets relate to the banking segment. Transactions between our banking and financial services segments are eliminated in consolidation. Selected financial information for our segments follows for the periods indicated:
		Banking		Financial		Consolidated
				services		total
	Three months ended March 31, 2015
	Net interest income	$	263	$	—	$	263
	Provision for credit losses	13		—		13
	Net interest income after provision for credit losses	250		—		250
	Noninterest income	67		16		82
	Amortization of intangibles	6		1		6
	Other noninterest expense	241		13		255
	Income before income taxes	70		2		71
	Income tax expense	19		1		20
	Net income	$	50	$	1	$	51
	Three months ended March 31, 2014
	Net interest income	$	271	$	—	$	271
	Provision for credit losses	24		—		24
	Net interest income after provision for credit losses	247		—		247
	Noninterest income	61		16		77
	Amortization of intangibles	7		1		8
	Other noninterest expense	227		14		241
	Income before income taxes	74		1		75
	Income tax expense	14		—		15
	Net income	$	60	$	1	$	60

Condensed_Parent_Company_Only_

Condensed Parent Company Only Financial Statements Condensed Parent Company Only Financial Statements	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Condensed Parent Company Only Financial Statements
	The following condensed statements of condition, the related condensed statements of income, and cash flows should be read in conjunction with our Consolidated Financial Statements and related notes:
	Condensed Statements of Condition	March 31,			December 31,
		2015			2014
	Assets:
	Cash and cash equivalents	$	383		$	383
	Investment in subsidiary	4,420			4,388
	Deferred taxes	30			32
	Other assets	14			13
	Total assets	$	4,847		$	4,815
	Liabilities and Stockholders’ Equity:
	Accounts payable and other liabilities	$	11		$	12
	Borrowings	711			710
	Stockholders’ equity	4,125			4,093
	Total liabilities and stockholders’ equity	$	4,847		$	4,815
		Three months ended March 31,
	Condensed Statements of Income	2015			2014
	Interest income	$	—		$	—
	Dividends received from subsidiary	—			40
	Total interest and dividend income	—			40
	Interest expense	12			11
	Net interest income	(12		)	29
	Noninterest income	—			1
	Noninterest expense	5			7
	(Loss) income before income taxes and undisbursed income of subsidiary	(17		)	23
	Income tax benefit	(7		)	(6		)
	(Loss) income before undisbursed income of subsidiary	(11		)	29
	Undisbursed income of subsidiary	62			30
	Net income	51			59
	Preferred stock dividend	8			8
	Net income available to common stockholders	$	44		$	52
	Net income	$	51		$	59
	Other comprehensive income(1)	15			7
	Total comprehensive income	$	66		$	66
	(1)	See Consolidated Statements of Comprehensive Income for other comprehensive income detail.
		Three months ended March 31,
	Condensed Statements of Cash Flows	2015			2014
	Cash flows from operating activities:
	Net income	$	51		$	59
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undisbursed income of subsidiaries	(62		)	(30		)
	Stock-based compensation expense	2			2
	Deferred income tax (benefit) expense	(2		)	2
	Decrease (increase) in other assets	2			(4		)
	Decrease in other liabilities	(1		)	(1		)
	Net cash (used in) provided by operating activities	(9		)	29
	Cash flows from investing activities:
	Proceeds from maturities of securities available for sale	—			2
	Net cash provided by investing activities	—			2
	Cash flows from financing activities:
	Return of capital from subsidiary	45			—
	Dividends paid on preferred stock	(8		)	(8		)
	Dividends paid on common stock	(28		)	(28		)
	Net cash provided by (used in) financing activities	9			(36		)
	Net decrease in cash and cash equivalents	—			(4		)
	Cash and cash equivalents at beginning of period	383			390
	Cash and cash equivalents at end of period	$	383		$	386

Loans_and_Leases_Policies

Loans and Leases (Policies)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Acquired Loans	We have acquired loans in four acquisitions since January 1, 2009. All acquired loans were initially measured at fair value and subsequently accounted for under either Accounting Standards Codification Topic (“ASC”) 310-30 (Loans and Debt Securities Acquired with Deteriorated Credit Quality) or ASC 310-20 (Nonrefundable Fees and Other Costs.

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
The amortized cost, gross unrealized gains and losses, and approximate fair value of investment securities	The amortized cost, gross unrealized gains and losses, and fair value of our investment securities at the dates indicated are summarized as follows:
		Amortized		Unrealized			Unrealized			Fair
	31-Mar-15	cost		gains			losses			value
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	426	$	9		$	—		$	435
	U.S. Treasury	55		1			—			55
	U.S. government sponsored enterprises	270		4			—			275
	Corporate	822		19			(8		)	833
	Total debt securities	1,574		33			(8		)	1,599
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	33		1			(1		)	33
	Federal National Mortgage Association	89		5			—			94
	Federal Home Loan Mortgage Corporation	107		5			—			112
	Collateralized mortgage obligations:
	Federal National Mortgage Association	667		6			(4		)	668
	Federal Home Loan Mortgage Corporation	335		3			(1		)	337
	Total collateralized mortgage obligations	1,002		9			(5		)	1,006
	Total residential mortgage-backed securities	1,231		19			(6		)	1,244
	Commercial mortgage-backed securities, non-agency issued	1,351		46			—			1,397
	Total mortgage-backed securities	2,582		65			(6		)	2,641
	Collateralized loan obligations, non-agency issued	1,129		19			(1		)	1,146
	Asset-backed securities collateralized by:
	Student loans	223		7			—			230
	Credit cards	42		1			—			43
	Auto loans	148		1			—			149
	Other	82		1			—			83
	Total asset-backed securities	494		10			—			504
	Other	22		—			—			22
	Total securities available for sale	$	5,801	$	127		$	(16	)	$	5,911
	Investment securities held to maturity:
	Debt securities, U.S. government agencies	$	45	$	—		$	—		$	45
	Residential mortgage-backed securities:
	Government National Mortgage Association	11		—			—			11
	Federal National Mortgage Association	111		1			—			112
	Federal Home Loan Mortgage Corporation	61		1			—			61
	Collateralized mortgage obligations:
	Government National Mortgage Association	1,630		34			(2		)	1,662
	Federal National Mortgage Association	2,042		25			(8		)	2,060
	Federal Home Loan Mortgage Corporation	2,315		44			(8		)	2,351
	Total collateralized mortgage obligations	5,987		103			(17		)	6,073
	Total residential mortgage-backed securities	6,169		105			(17		)	6,257
	Total securities held to maturity	$	6,215	$	105		$	(17	)	$	6,302
		Amortized		Unrealized			Unrealized			Fair
	31-Dec-14	cost		gains			losses			value
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	444	$	10		$	—		$	453
	U.S. Treasury	25		—			—			25
	U.S. government sponsored enterprises	187		5			—			191
	Corporate	820		15			(12		)	823
	Total debt securities	1,476		29			(12		)	1,492
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	34		1			(1		)	34
	Federal National Mortgage Association	96		5			—			100
	Federal Home Loan Mortgage Corporation	115		5			—			120
	Collateralized mortgage obligations:
	Federal National Mortgage Association	694		2			(13		)	682
	Federal Home Loan Mortgage Corporation	353		1			(4		)	350
	Total collateralized mortgage obligations	1,047		3			(18		)	1,032
	Total residential mortgage-backed securities	1,291		13			(19		)	1,286
	Commercial mortgage-backed securities, non-agency issued	1,450		51			—			1,500
Total mortgage-backed securities	2,741		64			(19		)	2,786
Collateralized loan obligations, non-agency issued	1,001		18			(3		)	1,016
Asset-backed securities collateralized by:
Student loans	228		7			—			235
Credit cards	42		—			—			42
Auto loans	193		1			—			194
Other	127		1			(1		)	127
Total asset-backed securities	591		9			(1		)	599
Other	22		—			—			22
Total securities available for sale	$	5,830	$	121		$	(35	)	$	5,915
Investment securities held to maturity:
Debt securities, U.S. government agencies	$	60	$	—		$	—		$	60
Residential mortgage-backed securities:
Government National Mortgage Association	12		—			—			12
Federal National Mortgage Association	118		1			(1		)	118
Federal Home Loan Mortgage Corporation	65		1			—			65
Collateralized mortgage obligations:
Government National Mortgage Association	1,755		27			(3		)	1,779
Federal National Mortgage Association	1,965		11			(22		)	1,954
Federal Home Loan Mortgage Corporation	1,967		25			(17		)	1,976
Total collateralized mortgage obligations	5,687		63			(41		)	5,709
Total residential mortgage-backed securities	5,882		64			(42		)	5,904
Total securities held to maturity	$	5,942	$	64		$	(42	)	$	5,964
Investment securities in an unrealized loss position	The table below details certain information regarding our investment securities that were in an unrealized loss position at the dates indicated by the length of time those securities were in a continuous loss position:
		Less than 12 months								12 months or longer						Total
		Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
	31-Mar-15	value		losses			Count			value		losses			Count	value		losses			Count
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	14	$	—		19			$	1	$	—		5	$	14	$	—		24
	U.S. Treasury	10		—			1			—		—			—	10		—			1
	U.S. government sponsored enterprises	61		—			8			1		—			1	62		—			9
	Corporate	133		(4		)	75			75		(3		)	41	208		(8		)	116
	Total debt securities	217		(5		)	103			77		(3		)	47	295		(8		)	150
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	—		—			—			19		(1		)	5	19		(1		)	5
	Federal National Mortgage Association	—		—			1			—		—			—	—		—			1
	Collateralized mortgage obligations:
	Federal National Mortgage Association	—		—			—			185		(4		)	10	185		(4		)	10
	Federal Home Loan Mortgage Corporation	15		—			1			46		(1		)	2	62		(1		)	3
	Total collateralized mortgage obligations	15		—			1			231		(5		)	12	247		(5		)	13
	Total residential mortgage-backed securities	15		—			2			250		(6		)	17	265		(6		)	19
	Commercial mortgage-backed securities, non-agency issued	21		—			7			5		—			1	26		—			8
	Total mortgage-backed securities	36		—			9			255		(6		)	18	291		(6		)	27
	Collateralized loan obligations, non-agency issued	150		(1		)	18			159		(1		)	17	309		(1		)	35
	Asset-backed securities collateralized by:
	Student loans	23		—			3			1		—			1	24		—			4
	Auto loans	3		—			2			—		—			—	3		—			2
	Other	26		—			2			26		—			3	52		—			5
	Total asset-backed securities	51		—			7			28		—			4	79		—			11
	Other	—		—			—			9		—			3	9		—			3
	Total securities available for sale in an unrealized loss position	$	455	$	(5	)	137			$	528	$	(11	)	89	$	983	$	(16	)	226
		Less than 12 months								12 months or longer						Total
		Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
	31-Mar-15	value		losses			Count			value		losses			Count	value		losses			Count
	Investment securities held to maturity:
	Residential mortgage-backed securities:
	Government National Mortgage Association	—		—			—			2		—			2	2		—			2
	Federal National Mortgage Association	7		—			5			33		—			9	40		—			14
	Federal Home Loan Mortgage Corporation	1		—			2			4		—			1	5		—			3
	Collateralized mortgage obligations:
	Government National Mortgage Association	68		—			15			114		(1		)	24	183		(2		)	39
	Federal National Mortgage Association	2		—			2			460		(8		)	27	462		(8		)	29
	Federal Home Loan Mortgage Corporation	123		—			9			383		(7		)	23	506		(8		)	32
	Total collateralized mortgage obligations	194		(1		)	26			957		(16		)	74	1,151		(17		)	100
	Total residential mortgage-backed securities	202		(1		)	33			996		(17		)	86	1,198		(17		)	119
	Total securities held to maturity in an unrealized loss position	$	202	$	(1	)	33			$	996	$	(17	)	86	$	1,198	$	(17	)	119
		Less than 12 months								12 months or longer						Total
		Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
	31-Dec-14	value		losses			Count			value		losses			Count	value		losses			Count
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	16	$	—		22			$	1	$	—		5	$	17	$	—		27
	US Treasury	5		—			1			—		—			—	5		—			1
	U.S. government sponsored enterprises	18		—			7			42		—			4	60		—			11
	Corporate	176		(7		)	127			102		(5		)	61	278		(12		)	188
	Total debt securities	215		(7		)	157			145		(5		)	70	360		(12		)	227
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	—		—			—			19		(1		)	5	19		(1		)	5
	Collateralized mortgage obligations:
	Federal National Mortgage Association	26		—			3			517		(13		)	30	542		(13		)	33
	Federal Home Loan Mortgage Corporation	47		—			3			216		(4		)	12	263		(4		)	15
	Total collateralized mortgage obligations	73		—			6			733		(18		)	42	806		(18		)	48
	Total residential mortgage-backed securities	73		—			6			752		(19		)	47	825		(19		)	53
	Commercial mortgage-backed securities, non-agency issued	13		—			3			24		—			3	36		—			6
Total mortgage-backed securities	85		—			9			776		(19		)	50	861		(19		)	59
Collateralized loan obligations, non-agency issued	276		(2		)	32			146		(1		)	15	422		(3		)	47
Asset-backed securities collateralized by:
Student loans	26		—			4			2		—			2	28		—			6
Credit card	8		—			1			—		—			—	8		—			1
Auto loans	3		—			2			—		—			—	3		—			2
Other	—		—			1			52		(1		)	5	52		(1		)	6
Total asset-backed securities	37		—			8			55		(1		)	7	92		(1		)	15
Other	—		—			—			9		—			3	9		—			3
Total securities available for sale in an unrealized loss position	$	614	$	(10	)	206			$	1,130	$	(26	)	145	$	1,744	$	(35	)	351
	Less than 12 months								12 months or longer						Total
	Fair		Unrealized						Fair		Unrealized				Fair		Unrealized
31-Dec-14	value		losses			Count			value		losses			Count	value		losses			Count
Investment securities held to maturity:
Debt securities, U.S. government agencies	$	38	$	—		5			$	—	$	—		—	$	38	$	—		5
Residential mortgage-backed securities:
Government National Mortgage Association	—		—			—			2		—			2	2		—			2
Federal National Mortgage Association	4		—			1			51		(1		)	12	55		(1		)	13
Federal Home Loan Mortgage Corporation	33		—			9			9		—			2	42		—			11
Collateralized mortgage obligations:
Government National Mortgage Association	360		(2		)	48			46		(1		)	12	407		(3		)	60
Federal National Mortgage Association	240		(1		)	18			648		(21		)	36	888		(22		)	54
Federal Home Loan Mortgage Corporation	422		(5		)	27			463		(12		)	28	885		(17		)	55
Total collateralized mortgage obligations	1,022		(8		)	93			1,157		(34		)	76	2,179		(41		)	169
Total residential mortgage-backed securities	1,059		(8		)	103			1,219		(35		)	92	2,278		(42		)	195
Total securities held to maturity in an unrealized loss position	$	1,097	$	(8	)	108			$	1,219	$	(35	)	92	$	2,316	$	(42	)	200
Scheduled contractual maturities of investment securities	Scheduled contractual maturities of our investment securities at March 31, 2015 were as follows:
		Amortized cost		Fair value
	Debt securities:
	Within one year	$	115	$	116
	After one year through five years	819		839
	After five years through ten years	662		667
	After ten years	22		22
	Total debt securities	1,619		1,644
	Mortgage-backed securities	8,751		8,898
	Collateralized loan obligations	1,129		1,146
	Asset-backed securities	494		504
	Other	22		22
		$	12,015	$	12,214

Loans_and_Leases_Tables

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Summary of loans and leases	Our loans and leases receivable consisted of the following at the dates indicated:
		31-Mar-15										31-Dec-14
		Originated			Acquired			Total				Originated			Acquired			Total
	Commercial:
	Real estate	$	6,204		$	996		$	7,201			$	6,181		$	1,050		$	7,231
	Construction	1,087			—			1,087				973			1			973
	Business	5,448			343			5,791				5,430			345			5,775
	Total commercial	12,738			1,340			14,078				12,584			1,395			13,979
	Consumer:
	Residential real estate	2,136			1,194			3,330				2,096			1,257			3,353
	Home equity	1,888			1,056			2,944				1,847			1,089			2,936
	Indirect auto	2,201			—			2,201				2,166			—			2,166
	Credit cards	301			—			301				324			—			324
	Other consumer	264			—			264				278			—			278
	Total consumer	6,790			2,250			9,040				6,711			2,347			9,058
	Total loans and leases	19,529			3,590			23,118				19,296			3,742			23,037
	Allowance for loan losses	(224		)	(7		)	(231		)		(228		)	(6		)	(234		)
	Total loans and leases, net	$	19,304		$	3,583		$	22,887			$	19,067		$	3,736		$	22,803
The outstanding principal balance and the related carrying amount of acquired loans
		March 31,			December 31,
		2015			2014
	Credit impaired acquired loans evaluated individually for future credit losses
	Outstanding principal balance	$	10		$	10
	Carrying amount	5			6
	Acquired loans evaluated collectively for future credit losses
	Outstanding principal balance	2,419			2,549
	Carrying amount	2,367			2,496
	Other acquired loans
	Outstanding principal balance	1,248			1,274
	Carrying amount	1,217			1,240
	Total acquired loans
	Outstanding principal balance	3,677			3,832
	Carrying amount	3,590			3,742
Changes in the accretable discount on loans acquired	The following table presents changes in the accretable yield, which includes income recognized from contractual interest cash flows, for the dates indicated. Acquired lines of credit accounted for under ASC 310-20 are not included in this table.
	Balance at January 1, 2014	$	(851	)
	Net reclassifications from nonaccretable yield	(5		)
	Accretion	138
	Other (1)	55
	Balance at December 31, 2014	(663		)
	Accretion	28
	Balance at March 31, 2015	$	(635	)
	(1)	Includes changes in expected cash flows from changes in interest rate and prepayment assumptions.
Activity in the allowance for credit losses	The following table presents the activity in our allowance for loan losses on originated loans and related recorded investment of the associated loans in our originated loan portfolio segment for the periods indicated:
		Commercial							Consumer
	Originated loans	Real estate			Business				Residential			Home equity			Indirect auto			Credit cards			Other			Total
																					consumer
	Three months ended March 31, 2015
	Allowance for loan losses:
	Balance at beginning of period	$	65		$	122			$	2		$	8		$	14		$	12		$	5		$	228
	Provision for loan losses	8			—				—			(2		)	2			2			1			11
	Charge-offs	(4		)	(7		)		—			(1		)	(2		)	(3		)	(2		)	(19		)
	Recoveries	—			2				—			—			1			1			—			4
	Balance at end of period	$	69		$	117			$	2		$	6		$	14		$	11		$	4		$	224
	Allowance for loan losses:
	Individually evaluated for impairment	$	5		$	3			$	1		$	—		$	—		$	—		$	—		$	9
	Collectively evaluated for impairment	64			115				1			6			14			11			4			215
	Total	$	69		$	117			$	2		$	6		$	14		$	11		$	4		$	224
	Loans receivable:
	Balance at end of period
	Individually evaluated for impairment	$	76		$	76			$	22		$	6		$	3		$	—		$	2		$	186
	Collectively evaluated for impairment	7,214			5,372				2,114			1,882			2,198			301			261			19,343
	Total	$	7,291		$	5,448			$	2,136		$	1,888		$	2,201		$	301		$	264		$	19,529
	Three months ended March 31, 2014
	Allowance for loan losses:
	Balance at beginning of period	$	47		$	120			$	2		$	7		$	10		$	13		$	6		$	205
	Provision for loan losses	12			—				—			1			3			2			2			20
	Charge-offs	(1		)	(10		)		—			(1		)	(2		)	(3		)	(2		)	(20		)
	Recoveries	3			1				—			—			—			—			—			4
	Balance at end of period	$	61		$	112			$	2		$	8		$	11		$	12		$	6		$	210
	Allowance for loan losses:
	Individually evaluated for impairment	$	1		$	2			$	1		$	3		$	—		$	—		$	—		$	7
	Collectively evaluated for impairment	59			110				1			5			11			12			6			202
	Total	$	61		$	112			$	2		$	8		$	11		$	12		$	6		$	210
	Loans receivable:
	Balance at end of period
	Individually evaluated for impairment	$	60		$	55			$	20		$	6		$	1		$	—		$	2		$	146
	Collectively evaluated for impairment	6,515			4,998				1,878			1,598			1,654			306			293			17,242
	Total	$	6,575		$	5,053			$	1,898		$	1,605		$	1,655		$	306		$	296		$	17,389
	The following table presents the activity in our allowance for loan losses and related recorded investment of the associated loans in our acquired loan portfolio for the periods indicated:
		Commercial							Consumer
	Acquired loans	Real estate			Business				Residential			Home equity			Credit cards			Other			Total
																		consumer
	Three months ended March 31, 2015
	Allowance for loan losses:
	Balance at beginning of period	$	1		$	1			$	2		$	2		$	—		$	—		$	6
	Provision for loan losses	2			—				—			1			—			—			3
	Charge-offs	(2		)	—				—			(1		)	—			—			(3		)
	Recoveries	—			—				—			—			—			—			—
	Balance at end of period	$	2		$	1			$	2		$	3		$	—		$	—		$	7
	Allowance for loan losses:
	Individually evaluated for impairment	$	—		$	—			$	—		$	—		$	—		$	—		$	—
	Collectively evaluated for impairment	2			1				2			3			—			—			7
	Total	$	2		$	1			$	2		$	3		$	—		$	—		$	7
	Loans receivable:
	Balance at end of period
	Individually evaluated for impairment	$	—		$	3			$	—		$	4		$	—		$	—		$	7
	Collectively evaluated for impairment	—			271				—			939			—			—			1,211
	Loans acquired with deteriorated credit quality	996			69				1,194			113			—			—			2,372
	Total	$	996		$	343			$	1,194		$	1,056		$	—		$	—		$	3,590
	Three months ended March 31, 2014
	Allowance for loan losses:
	Balance at beginning of period	$	—		$	—			$	1		$	3		$	—		$	—		$	4
	Provision for loan losses	1			—				—			2			—			—			3
	Charge-offs	(1		)	—				—			(2		)	—			—			(3		)
	Recoveries	—			—				—			—			—			—			—
	Balance at end of period	$	—		$	—			$	1		$	3		$	—		$	—		$	4
Allowance for loan losses:
Individually evaluated for impairment	$	—		$	—			$	—		$	—		$	—		$	—		$	—
Collectively evaluated for impairment	—			—				1			3			—			—			4
Total	$	—		$	—			$	1		$	3		$	—		$	—		$	4
Loans receivable:
Balance at end of period
Individually evaluated for impairment	$	—		$	7			$	—		$	4		$	—		$	—		$	11
Collectively evaluated for impairment	—			314				—			999			—			—			1,313
Loans acquired with deteriorated credit quality	1,292			95				1,491			160			—			—			3,038
Total	$	1,292		$	417			$	1,491		$	1,162		$	—		$	—		$	4,362
Summary of nonperforming loans	Our nonperforming loans consisted of the following at the dates indicated:
		March 31, 2015										December 31, 2014
		Originated			Acquired			Total (1)				Originated			Acquired			Total
	Commercial:
	Real estate	$	66		$	—		$	66			$	53		$	—		$	53
	Business	55			7			61				45			7			53
	Total commercial	120			7			127				98			7			106
	Consumer:
	Residential real estate	33			—			33				34			—			34
	Home equity	26			23			49				24			23			47
	Indirect auto	13			—			13				13			—			13
	Other consumer	5			—			5				5			—			5
	Total consumer	77			23			101				75			23			98
	Total	$	198		$	30		$	228			$	174		$	30		$	204
	(1)	Nonperforming loans do not include $5 million related to a nonperforming loan classified as held for sale as of March 31, 2015, which was sold and for which we received the proceeds on April 2, 2015.
Additional interest income if loans were performing	The table below provides information about the interest income that would have been recognized if our nonperforming loans had performed in accordance with terms for the periods indicated:
		Three months ended
		March 31,
		2015			2014
	Additional interest income that would have been recorded if nonperforming loans had performed in accordance with original terms	$	3		$	2
Summary of impaired loans	The following table provides information about our impaired originated loans including ending recorded investment, principal balance, and related allowance amount at the dates indicated. Loans with no related allowance for loan losses have adequate collateral securing their carrying value and in some circumstances have been charged down to their current carrying value based on the fair value of the collateral. The recorded investment of our impaired loans, less any related allowance for loan losses, was 69% and 70% of the loans’ unpaid principal balance at March 31, 2015 and December 31, 2014, respectively.
		31-Mar-15										31-Dec-14
	Originated loans	Recorded			Unpaid			Related				Recorded			Unpaid			Related
		investment(1)			principal			allowance				investment			principal			allowance
					balance										balance
	With no related allowance recorded:
	Commercial:
	Real estate	$	42		$	62		$	—			$	40		$	59		$	—
	Business	49			75			—				29			51			—
	Total commercial	90			136			—				69			110			—
	Consumer:
	Residential real estate	15			17			—				8			9			—
	Home equity	4			5			—				3			4			—
	Indirect auto	2			3			—				2			3			—
	Other consumer	1			1			—				2			2			—
	Total consumer	22			28			—				16			18			—
	Total	$	113		$	164		$	—			$	85		$	128		$	—
	With a related allowance recorded:
	Commercial:
	Real estate	$	35		$	41		$	5			$	24		$	27		$	2
	Business	27			40			3				32			43			2
	Total commercial	62			80			8				56			70			4
	Consumer:
	Residential real estate	7			7			1				11			13			1
	Home equity	2			2			—				4			4			1
	Indirect auto	1			1			—				—			—			—
	Other consumer	1			1			—				—			—			—
	Total consumer	11			11			1				16			17			2
	Total	$	73		$	91		$	9			$	71		$	87		$	6
	Total
	Commercial:
	Real estate	$	76		$	102		$	5			$	64		$	86		$	2
	Business	76			114			3				61			93			2
	Total commercial	152			217			8				125			179			4
	Consumer:
	Residential real estate	22			24			1				20			22			1
	Home equity	6			7			—				7			8			1
	Indirect auto	3			4			—				2			3			—
	Other consumer	2			3			—				2			2			—
	Total consumer	33			38			1				31			36			2
	Total	$	186		$	255		$	9			$	156		$	215		$	6
	(1)	Impaired loans do not include $5 million related to a nonperforming loan classified as held for sale as of March 31, 2015, which was sold and for which we received the proceeds on April 2, 2015.
	The following table provides information about our impaired acquired loans with no related allowance at the dates indicated. The remaining credit mark is considered adequate to cover any loss on these balances.
		31-Mar-15										31-Dec-14
	Acquired loans	Recorded			Unpaid			Related				Recorded			Unpaid principal balance			Related
		investment			principal			allowance				investment						allowance
					balance
	Commercial:
	Real estate	$	—		$	—		$	—			$	—		$	—		$	—
	Business	3			3			—				3			3			—
	Total commercial	3			3			—				3			3			—
	Consumer:
	Residential real estate	—			—			—				—			—			—
	Home equity	4			5			—				4			6			—
	Other consumer	—			—			—				—			—			—
	Total consumer	4			5			—				4			6			—
	Total(1)	$	7		$	8		$	—			$	7		$	9		$	—
	-1	Includes nonperforming purchased credit impaired loans.
	The following table provides information about our impaired originated loans including the average recorded investment and interest income recognized on impaired loans for the periods indicated:
		March 31,
		2015							2014
	Originated loans	Average			Interest				Average			Interest
		recorded			income				recorded			income
		investment			recognized				investment			recognized
Three months ended March 31,
Commercial:
Real estate	$	77		$	—			$	62		$	—
Business	78			—				55			—
Total commercial	155			1				117			1
Consumer:
Residential real estate	22			—				20			—
Home equity	6			—				6			—
Indirect auto	3			—				2			—
Other consumer	3			—				2			—
Total consumer	33			—				31			—
Total	$	189		$	1			$	148		$	1
The following table provides information about our impaired acquired loans including the average recorded investment and interest income recognized on impaired loans for the periods indicated:
	March 31,
	2015							2014
Acquired loans	Average			Interest				Average			Interest
	recorded			income				recorded			income
	investment			recognized				investment			recognized
Three months ended March 31,
Commercial:
Real estate	$	—		$	—			$	—		$	—
Business	3			—				8			—
Total commercial	3			—				8			—
Consumer:
Residential real estate	—			—				—			—
Home equity	4			—				4			—
Other consumer	—			—				—			—
Total consumer	4			—				4			—
Total(1)	$	7		$	—			$	11		$	—
-1	Includes nonperforming purchased credit impaired loans.
Reconciliation between nonaccrual loans and impaired loans	The following table is a reconciliation between nonperforming loans and impaired loans at the dates indicated:
		Commercial			Consumer			Total
	31-Mar-15
	Nonperforming loans	$	127		$	101		$	228
	Plus: Accruing TDRs	56			8			64
	Less: Smaller balance nonperforming loans evaluated collectively when determining the allowance for loan losses	(28		)	(72		)	(100		)
	Total impaired loans(1)	$	155		$	37		$	192
	December 31, 2014:
	Nonperforming loans	$	106		$	98		$	204
	Plus: Accruing TDRs	59			8			67
	Less: Smaller balance nonperforming loans evaluated collectively when determining the allowance for loan losses	(36		)	(71		)	(108		)
	Total impaired loans(1)	$	128		$	35		$	163
	(1)	Includes nonperforming purchased credit impaired loans.
Aging analysis of loans	The following tables contain an aging analysis of our loans by class at the dates indicated:
		30-59 days			60-89 days			Greater			Total			Current			Total loans			Greater than
		past due			past due			than			past due						receivable			90 days
								90 days												and accruing (1)
								past due
	31-Mar-15
	Originated loans
	Commercial:
	Real estate	$	6		$	5		$	34		$	45		$	7,246		$	7,291		$	—
	Business	19			2			14			36			5,412			5,448			—
	Total commercial	26			7			48			80			12,658			12,738			—
	Consumer:
	Residential real estate	5			1			19			25			2,111			2,136			—
	Home equity	3			1			16			20			1,868			1,888			—
	Indirect auto	13			2			5			21			2,180			2,201			—
	Credit cards	1			1			3			5			296			301			3
	Other consumer	2			1			3			6			258			264			—
	Total consumer	25			7			45			77			6,713			6,790			3
	Total	$	50		$	13		$	94		$	157		$	19,371		$	19,529		$	3
	Acquired loans
	Commercial:
	Real estate	$	4		$	2		$	24		$	29		$	967		$	996		$	24
	Business	1			1			7			8			335			343			4
	Total commercial	4			2			30			37			1,303			1,340			27
	Consumer:
	Residential real estate	11			5			52			68			1,126			1,194			52
	Home equity	5			3			20			28			1,027			1,056			5
	Total consumer	17			8			72			96			2,154			2,250			57
	Total	$	21		$	10		$	102		$	133		$	3,456		$	3,590		$	84
		30-59 days			60-89 days			Greater			Total			Current			Total loans			Greater than
		past due			past due			than			past due						receivable			90 days
								90 days												and accruing (1)
								past due
	31-Dec-14
	Originated loans
	Commercial:
	Real estate	$	7		$	2		$	31		$	40		$	7,113		$	7,154		$	—
	Business	5			7			17			28			5,402			5,430			—
	Total commercial	11			9			49			69			12,515			12,584			—
	Consumer:
	Residential real estate	4			2			21			27			2,069			2,096			—
	Home equity	3			1			15			19			1,828			1,847			—
	Indirect auto	17			4			5			27			2,139			2,166			—
	Credit cards	2			2			2			6			318			324			2
	Other consumer	3			1			3			7			271			278			—
	Total consumer	29			10			46			85			6,626			6,711			2
	Total	$	41		$	19		$	95		$	154		$	19,141		$	19,296		$	2
	Acquired loans
	Commercial:
	Real estate	$	3		$	3		$	26		$	31		$	1,019		$	1,050		$	26
	Business	—			—			7			7			338			345			4
	Total commercial	3			3			33			38			1,357			1,395			30
	Consumer:
	Residential real estate	11			5			56			72			1,186			1,257			56
	Home equity	6			2			21			29			1,060			1,089			6
	Total consumer	17			7			77			101			2,246			2,347			62
	Total	$	21		$	9		$	109		$	139		$	3,603		$	3,742		$	91
	(1)	Includes credit card loans, loans that have matured and are in the process of collection, and acquired loans that were originally recorded at fair value upon acquisition. Acquired loans are considered to be accruing as we can reasonably estimate future cash flows on these acquired loans and we expect to fully collect the carrying value of these loans net of the allowance for acquired loan losses. Therefore, we are accreting the difference between the carrying value of these loans and their expected cash flows into interest income.
Information about the credit quality of our commercial loan portfolio	Our internal loan risk assessment provides information about the financial health of our commercial borrowers and our risk of potential loss. The following tables present information about the credit quality of our commercial loan portfolio at the dates indicated:
		Real estate			Business			Total			Percent of total
	31-Mar-15
	Originated loans:
	Pass	$	6,936		$	5,122		$	12,058		94.7	%
	Criticized:(1)(2)
	Accrual	290			271			560			4.4
	Nonaccrual	66			55			120			0.9
	Total criticized	355			325			680			5.3
	Total	$	7,291		$	5,448		$	12,738		100	%
	Acquired loans:
	Pass	$	895		$	295		$	1,190		88.8	%
	Criticized:(1)
	Accrual	101			42			143			10.7
	Nonaccrual	—			7			7			0.5
	Total criticized	101			49			150			11.2
	Total	$	996		$	343		$	1,340		100	%
	31-Dec-14
	Originated loans:
	Pass	$	6,791		$	5,067		$	11,858		94.2	%
	Criticized:(1)
	Accrual	310			318			628			5
	Nonaccrual	53			45			98			0.8
	Total criticized	363			363			726			5.8
	Total	$	7,154		$	5,430		$	12,584		100	%
	Acquired loans:
	Pass	$	948		$	294		$	1,243		89.1	%
	Criticized:(1)
	Accrual	102			43			145			10.4
	Nonaccrual	—			7			7			0.5
	Total criticized	102			51			153			10.9
	Total	$	1,050		$	345		$	1,395		100	%
	(1)	Includes special mention, substandard, doubtful, and loss, which are consistent with regulatory definitions, and as described in Item 1, “Business,” under “Asset Quality Review” in our Annual Report on 10-K for the year ended December 31, 2014.
Information about the credit quality of our consumer loan portfolio	Borrower FICO scores provide information about the credit quality of our consumer loan portfolio as they provide an indication as to the likelihood that a debtor will repay their debts. The scores are obtained from a nationally recognized consumer rating agency and are presented in the table below at the dates indicated:
		Residential			Home equity			Indirect auto			Credit cards			Other			Total			Percent of
		real estate												consumer						total
	31-Mar-15
	Originated loans by refreshed FICO score:
	Over 700	$	1,880		$	1,553		$	1,552		$	206		$	168		$	5,359		78.9	%
	660-700	128			184			345			51			45			752			11.1
	620-660	55			77			162			24			25			344			5
	580-620	33			35			68			10			12			158			2.3
	Less than 580	35			37			74			8			13			167			2.5
	No score(1)	6			2			—			2			1			11			0.2
	Total	$	2,136		$	1,888		$	2,201		$	301		$	264		$	6,790		100	%
	Acquired loans by refreshed FICO score:
	Over 700	$	809		$	821		$	—		$	—		$	—		$	1,630		72.5	%
	660-700	93			95			—			—			—			188			8.4
	620-660	58			50			—			—			—			107			4.8
	580-620	53			38			—			—			—			91			4
	Less than 580	60			35			—			—			—			95			4.2
	No score(1)	121			17			—			—			—			139			6.1
	Total	$	1,194		$	1,056		$	—		$	—		$	—		$	2,250		100	%
	31-Dec-14
	Originated loans by refreshed FICO score:
	Over 700	$	1,841		$	1,529		$	1,533		$	226		$	167		$	5,296		78.9	%
	660-700	124			182			347			53			46			752			11.2
	620-660	62			71			159			24			24			339			5
	580-620	28			31			64			11			13			148			2.2
	Less than 580	32			32			63			8			12			146			2.2
	No score(1)	9			1			—			3			17			31			0.5
	Total	$	2,096		$	1,847		$	2,166		$	324		$	278		$	6,711		100	%
	Acquired loans by refreshed FICO score:
	Over 700	$	872		$	851		$	—		$	—		$	—		$	1,723		73.4	%
	660-700	87			93			—			—			—			180			7.7
	620-660	61			52			—			—			—			113			4.8
	580-620	49			40			—			—			—			88			3.8
	Less than 580	57			34			—			—			—			91			3.9
	No score(1)	131			20			—			—			—			151			6.4
	Total	$	1,257		$	1,089		$	—		$	—		$	—		$	2,347		100	%
	(1)	Primarily includes loans that are serviced by others for which refreshed FICO scores were not available as of the date indicated.
Aggregate recorded investment of impaired loans with terms through troubled debt restructuring	The following table details additional information about our TDRs at the dates indicated:
		March 31,			December 31,
		2015			2014
	Aggregate recorded investment of impaired loans with terms modified through a troubled debt restructuring:
	Accruing interest	$	64		$	67
	Nonaccrual	54			53
	Total troubled debt restructurings (1)	$	119		$	120
	(1)	Includes 93 and 87 acquired loans that were restructured with a recorded investment of $4 million and $4 million at March 31, 2015 and December 31, 2014, respectively.
Financial effects of our modifications	The financial effects of our modifications are as follows for the periods indicated:
	Type of Concession	Count		Postmodification			Premodification			Postmodification
				recorded			allowance for			allowance for
				investment(1)			loan losses			loan losses
	Three months ended March 31, 2015
	Commercial:
	Commercial business
	Rate reduction	2		—			—			—
	Total commercial	2		—			—			—
	Consumer:
	Residential real estate
	Extension of term	7		1			—			—
	Extension of term and rate reduction	4		1			—			—
	Chapter 7 bankruptcy	5		1			—			—
	Home equity
	Extension of term	1		—			—			—
	Extension of term and rate reduction	1		—			—			—
	Chapter 7 Bankruptcy	23		1			—			—
	Indirect auto
	Chapter 7 Bankruptcy	53		1			—			—
	Other consumer
	Chapter 7 Bankruptcy	2		—			—			—
	Total consumer	96		5			—			—
	Total	98		$	5		$	—		$	—
	Three months ended March 31, 2014
	Commercial:
	Commercial real estate
	Extension of term and rate reduction	1		—			—			—
	Commercial business
	Extension of term	2		3			—			—
	Total commercial	3		3			—			—
	Consumer:
	Residential real estate
	Extension of term	2		—			—			—
	Deferral of principal and extension of term	1		—			—			—
	Extension of term and rate reduction	4		—			—			—
	Chapter 7 Bankruptcy	8		1			—			—
	Home equity
	Deferral of principal and extension of term	2		—			—			—
	Chapter 7 Bankruptcy	33		1			—			—
	Indirect auto
	Chapter 7 Bankruptcy	86		1			—			—
	Total consumer	136		4			—			—
	Total	139		$	7		$	—		$	—
	(1)Postmodification balances approximate premodification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant.
Information about residential mortgage banking activities	The following table provides information about our residential mortgage banking activities at the dates indicated:
		March 31,
		2015			2014
	Mortgages serviced for others	$	3,869		$	3,713
	Mortgage servicing asset recorded for loans serviced for others, net	37			36

Goodwill_Goodwill_Tables

Goodwill Goodwill (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Information regarding our goodwill [Table Text Block]
		Banking			Financial		Consolidated
					services		total
	Balances at January 1, 2014	$	2,381		$	68	$	2,449
	Acquisitions	—			1		1
	Impairment	(1,100		)	—		(1,100		)
	Balances at December 31, 2014	$	1,281		$	69	$	1,350

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative financial instruments	The following table presents information regarding our derivative financial instruments at the dates indicated:
		Asset derivatives						Liability derivatives
		Notional			Fair value  (1)			Notional		Fair value  (2)
		amount						amount
	31-Mar-15
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	$	3		$	—		$	230	$	4
	Derivatives not designated as hedging instruments:
	Interest rate swap agreements	3,830			138			3,836		139
	Total derivatives	$	3,833		$	138		$	4,065	$	142
	31-Dec-14
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	$	4		$	—		$	30	$	2
	Derivatives not designated as hedging instruments:
	Interest rate swap agreements	3,629			96			3,649		96
	Total derivatives	$	3,633		$	96		$	3,679	$	97
	(1)	Represents gross amounts, included in Other Assets in our Consolidated Statements of Condition.
	(2)	Represents gross amounts, included in Other Liabilities in our Consolidated Statements of Condition.
Amounts recognized for derivative financial instruments [Table Text Block]	The following table presents certain information about amounts recognized for our derivative financial instruments designated in cash flow hedging relationships for the periods indicated.
		Three months ended March 31,
	Cash Flow Hedges	2015				2014
	Interest rate swap agreements:
	Amount of (loss) gain on derivatives recognized in other comprehensive income, net of tax	$	(1	)		$	—

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per share using two-class method	The following table is a computation of our basic and diluted earnings per share using the two-class method for the periods indicated:
		Three months ended March 31,
		2015			2014
	Net income available to common stockholders	$	44		$	53
	Less income allocable to unvested restricted stock awards	—			—
	Net income allocable to common stockholders	$	44		$	52
	Weighted average common shares outstanding:
	Total shares issued	366			366
	Unallocated employee stock ownership plan shares	—			(2		)
	Unvested restricted stock awards	(3		)	(2		)
	Treasury shares	(13		)	(12		)
	Total basic weighted average common shares outstanding	351			350
	Effect of dilutive stock-based awards	2			2
	Total diluted weighted average common shares outstanding	353			351
	Basic earnings per common share	$	0.12		$	0.15
	Diluted earnings per common share	$	0.12		$	0.15
	Anti-dilutive stock-based awards excluded from the diluted weighted average common share calculations	11			11

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of Comprehensive Income (Loss)	The following table presents the activity in our Other Comprehensive Income for the periods indicated:
		Three months ended March 31,
		Pretax			Income			Net
					taxes
	2015
	Securities available for sale:
	Net unrealized holding gains arising during the period	$	26		$	10		$	16
	Net unrealized holding gains on securities transferred between available for sale and held to maturity:
	Amortization of net unrealized holding gains to income during the period	(2		)	(1		)	(2		)	(1)
	Interest rate swaps designated as cash flow hedges:
	Net unrealized losses arising during the period	(2		)	(1		)	(1		)
	Net unrealized losses on interest rate swaps designated as cash flow hedges	(1		)	(1		)	(1		)
	Amortization of net loss related to pension and post-retirement plans	1			—			1
	Total other comprehensive income	$	23		$	8		$	15
	2014
	Securities available for sale:
	Net unrealized holding gains arising during the year	$	14		$	5		$	9
	Net unrealized holding gains on securities transferred between available for sale and held to maturity:
	Amortization of net unrealized holding gains to income during the year	(3		)	(1		)	(2		)	(1)
	Total other comprehensive income	$	11		$	4		$	7
	(1)	Included in Interest income on investment securities and other in our Consolidated Statements of Income.
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the activity in our accumulated other comprehensive income for the periods indicated:
		Net unrealized gains on securities available for sale			Net unrealized gains (losses) on			Unrealized loss on			Pension and postretirement plans			Total
					securities transferred from			interest rate
					available for sale to			swaps designated as
					held to maturity			cash flow hedges
	Balance, January 1, 2015	$	52		$	12		$	(5	)	$	(51	)	$	9
	Period change, net of tax	16			(2		)	(1		)	1			15
	Balance, March 31, 2015	$	68		$	11		$	(6	)	$	(50	)	$	23
	Balance, January 1, 2014	$	64		$	20		$	(6	)	$	(16	)	$	62
	Period change, net of tax	9			(2		)	—			—			7
	Balance, March 31, 2014	$	73		$	18		$	(5	)	$	(16	)	$	69

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair value option quantitative disclosures
		March 31,		December 31,
		2015		2014
	Fair value carrying amount	$	40	$	35
	Aggregate unpaid principal balance	39		34
	Fair value carrying amount less aggregate unpaid principal balance	$	1	$	1
Summary of assets and liabilities measured at fair value on a recurring basis	The following tables summarize our assets and liabilities measured at fair value on a recurring basis at the dates indicated:
		Fair Value Measurements
		Total		Level 1		Level 2			Level 3
	31-Mar-15
	Assets:
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	435	$	—	$	435		$	—
	U.S. Treasury	55		55		—			—
	U.S. government sponsored enterprises	275		—		275			—
	Corporate	833		—		829			4
	Total debt securities	1,599		55		1,539			4
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	33		—		33			—
	Federal National Mortgage Association	94		—		94			—
	Federal Home Loan Mortgage Corporation	112		—		112			—
	Collateralized mortgage obligations:
	Federal National Mortgage Association	668		—		668			—
	Federal Home Loan Mortgage Corporation	337		—		337			—
	Total collateralized mortgage obligations	1,006		—		1,006			—
	Total residential mortgage-backed securities	1,244		—		1,244			—
	Commercial mortgage-backed securities, non-agency issued	1,397		—		1,397			—
	Total mortgage-backed securities	2,641		—		2,641			—
	Collateralized loan obligations, non-agency issued	1,146		—		1,146			—
	Asset-backed securities collateralized by:
	Student loans	230		—		230			—
	Credit cards	43		—		43			—
	Auto loans	149		—		149			—
	Other	83		—		83			—
	Total asset-backed securities	504		—		504			—
	Other	22		21		1			—
	Total securities available for sale	5,911		77		5,830			4
	Loans held for sale (1)	40		—		40			—
	Derivatives	138		—		138			—
	Total assets	$	6,090	$	77	$	6,008		$	4
	Liabilities:
	Derivatives	$	142	$	—	$	142		$	—
	(1)	Represents loans for which we have elected the fair value option.
		Fair Value Measurements
		Total		Level 1		Level 2			Level 3
	31-Dec-14
	Assets:
	Investment securities available for sale:
	Debt securities:
	States and political subdivisions	$	453	$	—	$	453		$	—
	U.S. Treasury	25		25		—			—
	U.S. government sponsored enterprises	191		—		191			—
	Corporate	823		—		818			4
	Total debt securities	1,492		25		1,463			4
	Mortgage-backed securities:
	Residential mortgage-backed securities:
	Government National Mortgage Association	34		—		34			—
	Federal National Mortgage Association	100		—		100			—
	Federal Home Loan Mortgage Corporation	120		—		120			—
	Collateralized mortgage obligations:
	Federal National Mortgage Association	682		—		682			—
	Federal Home Loan Mortgage Corporation	350		—		350			—
	Total collateralized mortgage obligations	1,032		—		1,032			—
	Total residential mortgage-backed securities	1,286		—		1,286			—
	Commercial mortgage-backed securities, non-agency issued	1,500		—		1,500			—
	Total mortgage-backed securities	2,786		—		2,786			—
	Collateralized loan obligations, non-agency issued	1,016		—		1,016			—
	Asset-backed securities collateralized by:
Student loans	235		—		235			—
Credit cards	42		—		42			—
Auto loans	194		—		194			—
Other	127		—		127			—
Total asset-backed securities	599		—		599			—
Other	22		21		1			—
Total securities available for sale	5,915		47		5,865			4
Loans held for sale (1)	35		—		35			—
Derivatives	93		—		93			—
Total assets	$	6,043	$	47	$	5,993		$	4
Liabilities:
Derivatives	$	94	$	—	$	94		$	—
(1)	Represents loans for which we have elected the fair value option.
Summary of assets and liabilities measured at fair value on a nonrecurring basis	The following table summarizes our assets and liabilities measured at fair value on a nonrecurring basis for the periods indicated:
		Fair Value Measurements										Total gains
		Total		Level 1		Level 2			Level 3			(losses)
	Three months ended March 31, 2015
	Collateral dependent impaired loans	$	18	$	—	$	9		$	9		$	(2	)
	Three months ended March 31, 2014
	Collateral dependent impaired loans	$	26	$	—	$	20		$	6		$	(2	)
Carrying value and estimated fair value of financial instruments	The carrying value and estimated fair value of our financial instruments, including those that are not measured and reported at fair value on a recurring basis or nonrecurring basis, at the dates indicated are as follows:
		31-Mar-15								31-Dec-14
		Carrying value		Estimated fair		Fair value				Carrying value			Estimated fair		Fair value
				value		level							value		level
	Financial assets:
	Cash and cash equivalents	$	388	$	388	1				$	420		$	420	1
	Investment securities available for sale	5,911		5,911		1,2,3		(1)		5,915			5,915		1,2,3	(1)
	Investment securities held to maturity	6,215		6,302		2				5,942			5,964		2
	Federal Home Loan Bank and Federal Reserve Bank common stock	375		375		2				412			412		2
	Loans held for sale	49		49		2				40			40		2
	Loans and leases, net	22,887		23,167		2,3		(2)		22,803			23,037		2,3	(2)
	Derivatives	138		138		2				93			93		2
	Accrued interest receivable	105		105		2				101			101		2
	Financial liabilities:
	Deposits	$	28,250	$	28,265	2				$	27,781		$	27,793	2
	Borrowings	5,973		5,985		2				6,206			6,215		2
	Derivatives	142		142		2				94			94		2
	Accrued interest payable	12		12		2				11			11		2
	(1)	For a detailed breakout of our investment securities available for sale, refer to our table of recurring fair value measurements.
	(2)	Loans and leases classified as level 2 are made up of $9 million and $10 million of collateral dependent impaired loans without significant adjustments made to appraised values at March 31, 2015 and December 31, 2014, respectively. All other loans and leases are classified as level 3.

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Financial information of business segments	Selected financial information for our segments follows for the periods indicated:
		Banking		Financial		Consolidated
				services		total
	Three months ended March 31, 2015
	Net interest income	$	263	$	—	$	263
	Provision for credit losses	13		—		13
	Net interest income after provision for credit losses	250		—		250
	Noninterest income	67		16		82
	Amortization of intangibles	6		1		6
	Other noninterest expense	241		13		255
	Income before income taxes	70		2		71
	Income tax expense	19		1		20
	Net income	$	50	$	1	$	51
	Three months ended March 31, 2014
	Net interest income	$	271	$	—	$	271
	Provision for credit losses	24		—		24
	Net interest income after provision for credit losses	247		—		247
	Noninterest income	61		16		77
	Amortization of intangibles	7		1		8
	Other noninterest expense	227		14		241
	Income before income taxes	74		1		75
	Income tax expense	14		—		15
	Net income	$	60	$	1	$	60

Condensed_Parent_Company_Only_1

Condensed Parent Company Only Financial Statements Condensed Parent Company Only Financial Statements (Tables)	3 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet [Table Text Block]
	Condensed Statements of Condition	March 31,			December 31,
		2015			2014
	Assets:
	Cash and cash equivalents	$	383		$	383
	Investment in subsidiary	4,420			4,388
	Deferred taxes	30			32
	Other assets	14			13
	Total assets	$	4,847		$	4,815
	Liabilities and Stockholders’ Equity:
	Accounts payable and other liabilities	$	11		$	12
	Borrowings	711			710
	Stockholders’ equity	4,125			4,093
	Total liabilities and stockholders’ equity	$	4,847		$	4,815
Condensed Income Statement [Table Text Block]
		Three months ended March 31,
	Condensed Statements of Income	2015			2014
	Interest income	$	—		$	—
	Dividends received from subsidiary	—			40
	Total interest and dividend income	—			40
	Interest expense	12			11
	Net interest income	(12		)	29
	Noninterest income	—			1
	Noninterest expense	5			7
	(Loss) income before income taxes and undisbursed income of subsidiary	(17		)	23
	Income tax benefit	(7		)	(6		)
	(Loss) income before undisbursed income of subsidiary	(11		)	29
	Undisbursed income of subsidiary	62			30
	Net income	51			59
	Preferred stock dividend	8			8
	Net income available to common stockholders	$	44		$	52
	Net income	$	51		$	59
	Other comprehensive income(1)	15			7
	Total comprehensive income	$	66		$	66
Condensed Cash Flow Statement [Table Text Block]
		Three months ended March 31,
	Condensed Statements of Cash Flows	2015			2014
	Cash flows from operating activities:
	Net income	$	51		$	59
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undisbursed income of subsidiaries	(62		)	(30		)
	Stock-based compensation expense	2			2
	Deferred income tax (benefit) expense	(2		)	2
	Decrease (increase) in other assets	2			(4		)
	Decrease in other liabilities	(1		)	(1		)
	Net cash (used in) provided by operating activities	(9		)	29
	Cash flows from investing activities:
	Proceeds from maturities of securities available for sale	—			2
	Net cash provided by investing activities	—			2
	Cash flows from financing activities:
	Return of capital from subsidiary	45			—
	Dividends paid on preferred stock	(8		)	(8		)
	Dividends paid on common stock	(28		)	(28		)
	Net cash provided by (used in) financing activities	9			(36		)
	Net decrease in cash and cash equivalents	—			(4		)
	Cash and cash equivalents at beginning of period	383			390
	Cash and cash equivalents at end of period	$	383		$	386

Investment_Securities_Availabl

Investment Securities - Available for Sale and Held to Maturity Securities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	$5,801	$5,830
Securities available for sale, unrealized gains	127	121
Securities available for sale, unrealized losses	-16	-35
Investment securities available for sale	5,911	5,915
Investment securities held to maturity	6,215	5,942
Securities held to maturity, unrealized gains	105	64
Held to maturity securities, unrealized losses	-17	-42
Investment securities held to maturity	6,302	5,964
Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	6,169	5,882
Securities held to maturity, unrealized gains	105	64
Held to maturity securities, unrealized losses	-17	-42
Investment securities held to maturity	6,257	5,904
Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	5,987	5,687
Securities held to maturity, unrealized gains	103	63
Held to maturity securities, unrealized losses	-17	-41
Investment securities held to maturity	6,073	5,709
Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	11	12
Securities held to maturity, unrealized gains	0	0
Held to maturity securities, unrealized losses	0	0
Investment securities held to maturity	11	12
Government National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	1,630	1,755
Securities held to maturity, unrealized gains	34	27
Held to maturity securities, unrealized losses	-2	-3
Investment securities held to maturity	1,662	1,779
Federal National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	111	118
Securities held to maturity, unrealized gains	1	1
Held to maturity securities, unrealized losses	0	-1
Investment securities held to maturity	112	118
Federal National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	2,042	1,965
Securities held to maturity, unrealized gains	25	11
Held to maturity securities, unrealized losses	-8	-22
Investment securities held to maturity	2,060	1,954
Federal Home Loan Mortgage Corporation [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	61	65
Securities held to maturity, unrealized gains	1	1
Held to maturity securities, unrealized losses	0	0
Investment securities held to maturity	61	65
Federal Home Loan Mortgage Corporation [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	2,315	1,967
Securities held to maturity, unrealized gains	44	25
Held to maturity securities, unrealized losses	-8	-17
Investment securities held to maturity	2,351	1,976
U.S. government agencies debt securities [Member] | Debt Securities [Member]
Schedule of available for sale securities [Line Items]
Investment securities held to maturity	45	60
Securities held to maturity, unrealized gains	0	0
Held to maturity securities, unrealized losses	0	0
Investment securities held to maturity	45	60
Debt securities [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	1,574	1,476
Securities available for sale, unrealized gains	33	29
Securities available for sale, unrealized losses	-8	-12
Investment securities available for sale	1,599	1,492
Debt securities [Member] | States and political subdivisions [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	426	444
Securities available for sale, unrealized gains	9	10
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	435	453
Debt securities [Member] | U.S. Treasury [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	55	25
Securities available for sale, unrealized gains	1	0
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	55	25
Debt securities [Member] | U.S. government sponsored enterprises [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	270	187
Securities available for sale, unrealized gains	4	5
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	275	191
Debt securities [Member] | Corporate [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	822	820
Securities available for sale, unrealized gains	19	15
Securities available for sale, unrealized losses	-8	-12
Investment securities available for sale	833	823
Mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	2,582	2,741
Securities available for sale, unrealized gains	65	64
Securities available for sale, unrealized losses	-6	-19
Investment securities available for sale	2,641	2,786
Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	1,231	1,291
Securities available for sale, unrealized gains	19	13
Securities available for sale, unrealized losses	-6	-19
Investment securities available for sale	1,244	1,286
Residential mortgage-backed securities [Member] | Government National Mortgage Association [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	33	34
Securities available for sale, unrealized gains	1	1
Securities available for sale, unrealized losses	-1	-1
Investment securities available for sale	33	34
Residential mortgage-backed securities [Member] | Federal National Mortgage Association [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	89	96
Securities available for sale, unrealized gains	5	5
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	94	100
Residential mortgage-backed securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	107	115
Securities available for sale, unrealized gains	5	5
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	112	120
Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	1,002	1,047
Securities available for sale, unrealized gains	9	3
Securities available for sale, unrealized losses	-5	-18
Investment securities available for sale	1,006	1,032
Collateralized mortgage obligations [Member] | Federal National Mortgage Association [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	667	694
Securities available for sale, unrealized gains	6	2
Securities available for sale, unrealized losses	-4	-13
Investment securities available for sale	668	682
Collateralized mortgage obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	335	353
Securities available for sale, unrealized gains	3	1
Securities available for sale, unrealized losses	-1	-4
Investment securities available for sale	337	350
Commercial mortgage-backed securities, non-agency issued [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	1,351	1,450
Securities available for sale, unrealized gains	46	51
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	1,397	1,500
Collateralized loan obligations, non-agency issued [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	1,129	1,001
Securities available for sale, unrealized gains	19	18
Securities available for sale, unrealized losses	-1	-3
Investment securities available for sale	1,146	1,016
Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	494	591
Securities available for sale, unrealized gains	10	9
Securities available for sale, unrealized losses	0	-1
Investment securities available for sale	504	599
Asset-backed securities [Member] | Student Loans [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	223	228
Securities available for sale, unrealized gains	7	7
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	230	235
Asset-backed securities [Member] | Credit cards [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	42	42
Securities available for sale, unrealized gains	1	0
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	43	42
Asset-backed securities [Member] | Auto Loans [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	148	193
Securities available for sale, unrealized gains	1	1
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	149	194
Asset-backed securities [Member] | Other [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	82	127
Securities available for sale, unrealized gains	1	1
Securities available for sale, unrealized losses	0	-1
Investment securities available for sale	83	127
Other securities [Member]
Schedule of available for sale securities [Line Items]
Amortized cost for securities available for sale	22	22
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	0	0
Investment securities available for sale	$22	$22

Investment_Securities_Availabl1

Investment Securities - Available for Sale and Held to Maturity Securities Continuous Unrealized Loss Position (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified	Security	Security
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	$455	$614
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	-5	-10
Available for sale securities in unrealized loss position less than 12 months, count	137	206
Fair value of available for sale securities in unrealized loss position 12 months or longer	528	1,130
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-11	-26
Available for sale securities in unrealized loss positions 12 months or longer, count	89	145
Total fair value available for sale securities	983	1,744
Available for sale securities in unrealized loss position, unrealized losses	-16	-35
Available for sale securities in unrealized loss positions, count	226	351
Fair value of held to maturity securities in unrealized loss position less than 12 months	202	1,097
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	-1	-8
Held to maturity securities in unrealized loss position less than 12 months, count	33	108
Fair value of held to maturity securities in unrealized loss position 12 months or longer	996	1,219
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-17	-35
Held to maturity securities in unrealized loss positions longer than 12 months, count	86	92
Total fair value of held to maturity securities	1,198	2,316
Total unrealized losses of held to maturity securities	-17	-42
Held to maturity securities in unrealized loss positions, count	119	200
Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	202	1,059
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	-1	-8
Held to maturity securities in unrealized loss position less than 12 months, count	33	103
Fair value of held to maturity securities in unrealized loss position 12 months or longer	996	1,219
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-17	-35
Held to maturity securities in unrealized loss positions longer than 12 months, count	86	92
Total fair value of held to maturity securities	1,198	2,278
Total unrealized losses of held to maturity securities	-17	-42
Held to maturity securities in unrealized loss positions, count	119	195
Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	194	1,022
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	-1	-8
Held to maturity securities in unrealized loss position less than 12 months, count	26	93
Fair value of held to maturity securities in unrealized loss position 12 months or longer	957	1,157
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-16	-34
Held to maturity securities in unrealized loss positions longer than 12 months, count	74	76
Total fair value of held to maturity securities	1,151	2,179
Total unrealized losses of held to maturity securities	-17	-41
Held to maturity securities in unrealized loss positions, count	100	169
Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	0	0
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	0
Held to maturity securities in unrealized loss position less than 12 months, count	0	0
Fair value of held to maturity securities in unrealized loss position 12 months or longer	2	2
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	0	0
Held to maturity securities in unrealized loss positions longer than 12 months, count	2	2
Total fair value of held to maturity securities	2	2
Total unrealized losses of held to maturity securities	0	0
Held to maturity securities in unrealized loss positions, count	2	2
Government National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	68	360
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	-2
Held to maturity securities in unrealized loss position less than 12 months, count	15	48
Fair value of held to maturity securities in unrealized loss position 12 months or longer	114	46
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-1	-1
Held to maturity securities in unrealized loss positions longer than 12 months, count	24	12
Total fair value of held to maturity securities	183	407
Total unrealized losses of held to maturity securities	-2	-3
Held to maturity securities in unrealized loss positions, count	39	60
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	7	4
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	0
Held to maturity securities in unrealized loss position less than 12 months, count	5	1
Fair value of held to maturity securities in unrealized loss position 12 months or longer	33	51
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	0	-1
Held to maturity securities in unrealized loss positions longer than 12 months, count	9	12
Total fair value of held to maturity securities	40	55
Total unrealized losses of held to maturity securities	0	-1
Held to maturity securities in unrealized loss positions, count	14	13
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	2	240
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	-1
Held to maturity securities in unrealized loss position less than 12 months, count	2	18
Fair value of held to maturity securities in unrealized loss position 12 months or longer	460	648
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-8	-21
Held to maturity securities in unrealized loss positions longer than 12 months, count	27	36
Total fair value of held to maturity securities	462	888
Total unrealized losses of held to maturity securities	-8	-22
Held to maturity securities in unrealized loss positions, count	29	54
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	1	33
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	0
Held to maturity securities in unrealized loss position less than 12 months, count	2	9
Fair value of held to maturity securities in unrealized loss position 12 months or longer	4	9
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	0	0
Held to maturity securities in unrealized loss positions longer than 12 months, count	1	2
Total fair value of held to maturity securities	5	42
Total unrealized losses of held to maturity securities	0	0
Held to maturity securities in unrealized loss positions, count	3	11
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months	123	422
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months	0	-5
Held to maturity securities in unrealized loss position less than 12 months, count	9	27
Fair value of held to maturity securities in unrealized loss position 12 months or longer	383	463
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer	-7	-12
Held to maturity securities in unrealized loss positions longer than 12 months, count	23	28
Total fair value of held to maturity securities	506	885
Total unrealized losses of held to maturity securities	-8	-17
Held to maturity securities in unrealized loss positions, count	32	55
Debt securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	217	215
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	-5	-7
Available for sale securities in unrealized loss position less than 12 months, count	103	157
Fair value of available for sale securities in unrealized loss position 12 months or longer	77	145
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-3	-5
Available for sale securities in unrealized loss positions 12 months or longer, count	47	70
Total fair value available for sale securities	295	360
Available for sale securities in unrealized loss position, unrealized losses	-8	-12
Available for sale securities in unrealized loss positions, count	150	227
Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	15	73
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	1	6
Fair value of available for sale securities in unrealized loss position 12 months or longer	231	733
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-5	-18
Available for sale securities in unrealized loss positions 12 months or longer, count	12	42
Total fair value available for sale securities	247	806
Available for sale securities in unrealized loss position, unrealized losses	-5	-18
Available for sale securities in unrealized loss positions, count	13	48
Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	15	73
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	2	6
Fair value of available for sale securities in unrealized loss position 12 months or longer	250	752
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-6	-19
Available for sale securities in unrealized loss positions 12 months or longer, count	17	47
Total fair value available for sale securities	265	825
Available for sale securities in unrealized loss position, unrealized losses	-6	-19
Available for sale securities in unrealized loss positions, count	19	53
Commercial mortgage-backed securities, non-agency issued [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	21	13
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	7	3
Fair value of available for sale securities in unrealized loss position 12 months or longer	5	24
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	1	3
Total fair value available for sale securities	26	36
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	8	6
Mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	36	85
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	9	9
Fair value of available for sale securities in unrealized loss position 12 months or longer	255	776
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-6	-19
Available for sale securities in unrealized loss positions 12 months or longer, count	18	50
Total fair value available for sale securities	291	861
Available for sale securities in unrealized loss position, unrealized losses	-6	-19
Available for sale securities in unrealized loss positions, count	27	59
Collateralized loan obligations, non-agency issued [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	150	276
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	-1	-2
Available for sale securities in unrealized loss position less than 12 months, count	18	32
Fair value of available for sale securities in unrealized loss position 12 months or longer	159	146
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-1	-1
Available for sale securities in unrealized loss positions 12 months or longer, count	17	15
Total fair value available for sale securities	309	422
Available for sale securities in unrealized loss position, unrealized losses	-1	-3
Available for sale securities in unrealized loss positions, count	35	47
Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	51	37
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	7	8
Fair value of available for sale securities in unrealized loss position 12 months or longer	28	55
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	-1
Available for sale securities in unrealized loss positions 12 months or longer, count	4	7
Total fair value available for sale securities	79	92
Available for sale securities in unrealized loss position, unrealized losses	0	-1
Available for sale securities in unrealized loss positions, count	11	15
Other securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	0	0
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	0	0
Fair value of available for sale securities in unrealized loss position 12 months or longer	9	9
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	3	3
Total fair value available for sale securities	9	9
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	3	3
Student Loans [Member] | Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	23	26
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	3	4
Fair value of available for sale securities in unrealized loss position 12 months or longer	1	2
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	1	2
Total fair value available for sale securities	24	28
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	4	6
Credit cards [Member] | Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months		8
Available for sale securities in unrealized loss position less than 12 months, unrealized losses		0
Available for sale securities in unrealized loss position less than 12 months, count		1
Fair value of available for sale securities in unrealized loss position 12 months or longer		0
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses		0
Available for sale securities in unrealized loss positions 12 months or longer, count		0
Total fair value available for sale securities		8
Available for sale securities in unrealized loss position, unrealized losses		0
Available for sale securities in unrealized loss positions, count		1
Auto Loans [Member] | Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	3	3
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	2	2
Fair value of available for sale securities in unrealized loss position 12 months or longer	0	0
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	0	0
Total fair value available for sale securities	3	3
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	2	2
Other [Member] | Asset-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	26	0
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	2	1
Fair value of available for sale securities in unrealized loss position 12 months or longer	26	52
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	-1
Available for sale securities in unrealized loss positions 12 months or longer, count	3	5
Total fair value available for sale securities	52	52
Available for sale securities in unrealized loss position, unrealized losses	0	-1
Available for sale securities in unrealized loss positions, count	5	6
States and political subdivisions [Member] | Debt securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	14	16
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	19	22
Fair value of available for sale securities in unrealized loss position 12 months or longer	1	1
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	5	5
Total fair value available for sale securities	14	17
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	24	27
US Treasury Securities [Member] | Debt securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	10	5
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	1	1
Fair value of available for sale securities in unrealized loss position 12 months or longer	0	0
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	0	0
Total fair value available for sale securities	10	5
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	1	1
US government agencies debt securities [Member] | Debt Securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of held to maturity securities in unrealized loss position less than 12 months		38
Unrealized losses of held to maturity securities in unrealized loss position less than 12 months		0
Held to maturity securities in unrealized loss position less than 12 months, count		5
Fair value of held to maturity securities in unrealized loss position 12 months or longer		0
Unrealized losses of held to maturity securities in unrealized loss position 12 months or longer		0
Held to maturity securities in unrealized loss positions longer than 12 months, count		0
Total fair value of held to maturity securities		38
Total unrealized losses of held to maturity securities		0
Held to maturity securities in unrealized loss positions, count		5
U.S. government sponsored enterprises [Member] | Debt securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	61	18
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	8	7
Fair value of available for sale securities in unrealized loss position 12 months or longer	1	42
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0	0
Available for sale securities in unrealized loss positions 12 months or longer, count	1	4
Total fair value available for sale securities	62	60
Available for sale securities in unrealized loss position, unrealized losses	0	0
Available for sale securities in unrealized loss positions, count	9	11
Corporate [Member] | Debt securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	133	176
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	-4	-7
Available for sale securities in unrealized loss position less than 12 months, count	75	127
Fair value of available for sale securities in unrealized loss position 12 months or longer	75	102
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-3	-5
Available for sale securities in unrealized loss positions 12 months or longer, count	41	61
Total fair value available for sale securities	208	278
Available for sale securities in unrealized loss position, unrealized losses	-8	-12
Available for sale securities in unrealized loss positions, count	116	188
Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	0	0
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	0	0
Fair value of available for sale securities in unrealized loss position 12 months or longer	19	19
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-1	-1
Available for sale securities in unrealized loss positions 12 months or longer, count	5	5
Total fair value available for sale securities	19	19
Available for sale securities in unrealized loss position, unrealized losses	-1	-1
Available for sale securities in unrealized loss positions, count	5	5
Federal National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	0	26
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	0	3
Fair value of available for sale securities in unrealized loss position 12 months or longer	185	517
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-4	-13
Available for sale securities in unrealized loss positions 12 months or longer, count	10	30
Total fair value available for sale securities	185	542
Available for sale securities in unrealized loss position, unrealized losses	-4	-13
Available for sale securities in unrealized loss positions, count	10	33
Federal National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	0
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0
Available for sale securities in unrealized loss position less than 12 months, count	1
Fair value of available for sale securities in unrealized loss position 12 months or longer	0
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	0
Available for sale securities in unrealized loss positions 12 months or longer, count	0
Total fair value available for sale securities	0
Available for sale securities in unrealized loss position, unrealized losses	0
Available for sale securities in unrealized loss positions, count	1
Federal Home Loan Mortgage Corporation [Member] | Collateralized mortgage obligations [Member]
Schedule of available for sale securities [Line Items]
Fair value of available for sale securities in unrealized loss position less than 12 months	15	47
Available for sale securities in unrealized loss position less than 12 months, unrealized losses	0	0
Available for sale securities in unrealized loss position less than 12 months, count	1	3
Fair value of available for sale securities in unrealized loss position 12 months or longer	46	216
Available for sale securities in unrealized loss position 12 months or longer, unrealized losses	-1	-4
Available for sale securities in unrealized loss positions 12 months or longer, count	2	12
Total fair value available for sale securities	62	263
Available for sale securities in unrealized loss position, unrealized losses	($1)	($4)
Available for sale securities in unrealized loss positions, count	3	15

Investment_Securities_Maturiti

Investment Securities - Maturities of Available for Sale and Held to Maturity Debt Securities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Scheduled contractual maturities of investment securities [Line Items]
Debt securities, amortized cost within one year	$115
Debt securities, fair value within one year	116
Debt securities, amortized cost after one year through five years	819
Debt securities, fair value after one year through five years	839
Debt securities, amortized cost after five years through ten years	662
Debt securities, fair value after five years through ten years	667
Debt securities, amortized cost after ten years	22
Debt securities, fair value after ten years	22
Debt securities, amortized cost	1,619
Debt securities, fair value	1,644
Mortgage-backed securities, amortized cost	8,751
Mortgage-backed securities, fair value	8,898
Available for sale securities, amortized cost	5,801	5,830
Investment securities available for sale	5,911	5,915
Total available for sale and held to maturity securities, amortized cost	12,015
Total available for sale and held to maturity securities, fair value	12,214
Collateralized loan obligations, non-agency issued [Member]
Scheduled contractual maturities of investment securities [Line Items]
Available for sale securities, amortized cost	1,129	1,001
Investment securities available for sale	1,146	1,016
Asset-backed securities [Member]
Scheduled contractual maturities of investment securities [Line Items]
Available for sale securities, amortized cost	494	591
Investment securities available for sale	504	599
Other securities [Member]
Scheduled contractual maturities of investment securities [Line Items]
Available for sale securities, amortized cost	22	22
Investment securities available for sale	$22	$22

Investment_Securities_Details_

Investment Securities (Details Textual)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investment Securities (Additional Textual) [Abstract]
Contractual maturity period of securities (in years)	10 years
Weighted average duration investment securities portfolio (in years)	3 years 9 months	3 years 8 months

Loans_and_Leases_Composition_D

Loans and Leases - Composition (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Summary of loans and leases
Loans receivable	$23,118	$23,037
Allowance for loan losses	-231	-234
Total loans and leases, net	22,887	22,803
Total commercial [Member]
Summary of loans and leases
Loans receivable	14,078	13,979
Total commercial [Member] | Commercial real estate [Member]
Summary of loans and leases
Loans receivable	7,201	7,231
Total commercial [Member] | Construction [Member]
Summary of loans and leases
Loans receivable	1,087	973
Total commercial [Member] | Business [Member]
Summary of loans and leases
Loans receivable	5,791	5,775
Total consumer [Member]
Summary of loans and leases
Loans receivable	9,040	9,058
Total consumer [Member] | Residential real estate [Member]
Summary of loans and leases
Loans receivable	3,330	3,353
Total consumer [Member] | Home equity [Member]
Summary of loans and leases
Loans receivable	2,944	2,936
Total consumer [Member] | Indirect auto [Member]
Summary of loans and leases
Loans receivable	2,201	2,166
Total consumer [Member] | Credit cards [Member]
Summary of loans and leases
Loans receivable	301	324
Total consumer [Member] | Other consumer [Member]
Summary of loans and leases
Loans receivable	264	278
Originated loans [Member]
Summary of loans and leases
Loans receivable	19,529	19,296	17,389
Allowance for loan losses	-224	-228
Total loans and leases, net	19,304	19,067
Originated loans [Member] | Total commercial [Member]
Summary of loans and leases
Loans receivable	12,738	12,584
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of loans and leases
Loans receivable	6,204	6,181
Originated loans [Member] | Total commercial [Member] | Construction [Member]
Summary of loans and leases
Loans receivable	1,087	973
Originated loans [Member] | Total commercial [Member] | Business [Member]
Summary of loans and leases
Loans receivable	5,448	5,430	5,053
Originated loans [Member] | Total consumer [Member]
Summary of loans and leases
Loans receivable	6,790	6,711
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of loans and leases
Loans receivable	2,136	2,096	1,898
Originated loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of loans and leases
Loans receivable	1,888	1,847	1,605
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member]
Summary of loans and leases
Loans receivable	2,201	2,166	1,655
Originated loans [Member] | Total consumer [Member] | Credit cards [Member]
Summary of loans and leases
Loans receivable	301	324
Originated loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of loans and leases
Loans receivable	264	278
Acquired loans [Member]
Summary of loans and leases
Loans receivable	3,590	3,742	4,362
Allowance for loan losses	-7	-6
Total loans and leases, net	3,583	3,736
Acquired loans [Member] | Total commercial [Member]
Summary of loans and leases
Loans receivable	1,340	1,395
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of loans and leases
Loans receivable	996	1,050
Acquired loans [Member] | Total commercial [Member] | Construction [Member]
Summary of loans and leases
Loans receivable	0	1
Acquired loans [Member] | Total commercial [Member] | Business [Member]
Summary of loans and leases
Loans receivable	343	345	417
Acquired loans [Member] | Total consumer [Member]
Summary of loans and leases
Loans receivable	2,250	2,347
Acquired loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of loans and leases
Loans receivable	1,194	1,257	1,491
Acquired loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of loans and leases
Loans receivable	1,056	1,089	1,162
Acquired loans [Member] | Total consumer [Member] | Indirect auto [Member]
Summary of loans and leases
Loans receivable	0	0
Acquired loans [Member] | Total consumer [Member] | Credit cards [Member]
Summary of loans and leases
Loans receivable	0	0
Acquired loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of loans and leases
Loans receivable	$0	$0

Loans_and_Leases_Acquired_Loan

Loans and Leases - Acquired Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
The outstanding principal balance and the related carrying amount of the acquired loans
Outstanding principal balance	$3,677	$3,832
Carrying amount	3,590	3,742
Credit impaired acquired loans evaluated individually for future credit losses [Member]
The outstanding principal balance and the related carrying amount of the acquired loans
Outstanding principal balance	10	10
Carrying amount	5	6
Acquired loans evaluated collectively for future credit losses [Member]
The outstanding principal balance and the related carrying amount of the acquired loans
Outstanding principal balance	2,419	2,549
Carrying amount	2,367	2,496
Other acquired loans [Member]
The outstanding principal balance and the related carrying amount of the acquired loans
Outstanding principal balance	1,248	1,274
Carrying amount	$1,217	$1,240

Loans_and_Leases_Accretable_Yi

Loans and Leases - Accretable Yield Rollforward(Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Changes in the accretable discount on loans acquired
Beginning balance	($663)	($851)	($851)
Net reclassifications from nonaccretable yield		-5
Accretion	28	138
Other changes in nonaccretable yield			55	[1]
Ending balance	($635)		($663)
[1]	Includes changes in expected cash flows from changes in interest rate and prepayment assumptions.

Loans_and_Leases_Allowance_for

Loans and Leases - Allowance for Loan Loss Rollforward (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Activity in the allowance for credit losses for the periods indicated
Total	$23,118		$23,037
Originated loans [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	228	205
Provision for loan losses	11	20
Charge-offs	-19	-20
Recoveries	4	4
Balance at end of period	224	210
Individually evaluated for impairment	9	7
Collectively evaluated for impairment	215	202
Total	224	210
Loans receivables, individually evaluated for impairment	186	146
Loans receivables, collectively evaluated for impairment	19,343	17,242
Total	19,529	17,389	19,296
Acquired loans [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	6	4
Provision for loan losses	3	3
Charge-offs	-3	-3
Recoveries	0	0
Balance at end of period	7	4
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	7	4
Total	7	4
Loans receivables, individually evaluated for impairment	7	11
Loans receivables, collectively evaluated for impairment	1,211	1,313
Loans acquired with deteriorated credit quality	2,372	3,038
Total	3,590	4,362	3,742
Total commercial [Member]
Activity in the allowance for credit losses for the periods indicated
Total	14,078		13,979
Total commercial [Member] | Business [Member]
Activity in the allowance for credit losses for the periods indicated
Total	5,791		5,775
Total commercial [Member] | Originated loans [Member]
Activity in the allowance for credit losses for the periods indicated
Total	12,738		12,584
Total commercial [Member] | Originated loans [Member] | Commercial real estate [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	65	47
Provision for loan losses	8	12
Charge-offs	-4	-1
Recoveries	0	3
Balance at end of period	69	61
Individually evaluated for impairment	5	1
Collectively evaluated for impairment	64	59
Total	69	61
Loans receivables, individually evaluated for impairment	76	60
Loans receivables, collectively evaluated for impairment	7,214	6,515
Total	7,291	6,575	7,154
Total commercial [Member] | Originated loans [Member] | Business [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	122	120
Provision for loan losses	0	0
Charge-offs	-7	-10
Recoveries	2	1
Balance at end of period	117	112
Individually evaluated for impairment	3	2
Collectively evaluated for impairment	115	110
Total	117	112
Loans receivables, individually evaluated for impairment	76	55
Loans receivables, collectively evaluated for impairment	5,372	4,998
Total	5,448	5,053	5,430
Total commercial [Member] | Acquired loans [Member]
Activity in the allowance for credit losses for the periods indicated
Total	1,340		1,395
Total commercial [Member] | Acquired loans [Member] | Commercial real estate [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	1	0
Provision for loan losses	2	1
Charge-offs	-2	-1
Recoveries	0	0
Balance at end of period	2	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2	0
Total	2	0
Loans receivables, individually evaluated for impairment	0	0
Loans receivables, collectively evaluated for impairment	0	0
Loans acquired with deteriorated credit quality	996	1,292
Total	996	1,292	1,050
Total commercial [Member] | Acquired loans [Member] | Business [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	1	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	1	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1	0
Total	1	0
Loans receivables, individually evaluated for impairment	3	7
Loans receivables, collectively evaluated for impairment	271	314
Loans acquired with deteriorated credit quality	69	95
Total	343	417	345
Total consumer [Member]
Activity in the allowance for credit losses for the periods indicated
Total	9,040		9,058
Total consumer [Member] | Residential real estate [Member]
Activity in the allowance for credit losses for the periods indicated
Total	3,330		3,353
Total consumer [Member] | Home equity [Member]
Activity in the allowance for credit losses for the periods indicated
Total	2,944		2,936
Total consumer [Member] | Indirect auto [Member]
Activity in the allowance for credit losses for the periods indicated
Total	2,201		2,166
Total consumer [Member] | Originated loans [Member]
Activity in the allowance for credit losses for the periods indicated
Total	6,790		6,711
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	2	2
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	2	2
Individually evaluated for impairment	1	1
Collectively evaluated for impairment	1	1
Total	2	2
Loans receivables, individually evaluated for impairment	22	20
Loans receivables, collectively evaluated for impairment	2,114	1,878
Total	2,136	1,898	2,096
Total consumer [Member] | Originated loans [Member] | Home equity [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	8	7
Provision for loan losses	-2	1
Charge-offs	-1	-1
Recoveries	0	0
Balance at end of period	6	8
Individually evaluated for impairment	0	3
Collectively evaluated for impairment	6	5
Total	6	8
Loans receivables, individually evaluated for impairment	6	6
Loans receivables, collectively evaluated for impairment	1,882	1,598
Total	1,888	1,605	1,847
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	14	10
Provision for loan losses	2	3
Charge-offs	-2	-2
Recoveries	1	0
Balance at end of period	14	11
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	14	11
Total	14	11
Loans receivables, individually evaluated for impairment	3	1
Loans receivables, collectively evaluated for impairment	2,198	1,654
Total	2,201	1,655	2,166
Total consumer [Member] | Originated loans [Member] | Credit cards [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	12	13
Provision for loan losses	2	2
Charge-offs	-3	-3
Recoveries	1	0
Balance at end of period	11	12
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	11	12
Total	11	12
Loans receivables, individually evaluated for impairment	0	0
Loans receivables, collectively evaluated for impairment	301	306
Total	301	306	324
Total consumer [Member] | Originated loans [Member] | Other consumer [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	5	6
Provision for loan losses	1	2
Charge-offs	-2	-2
Recoveries	0	0
Balance at end of period	4	6
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4	6
Total	4	6
Loans receivables, individually evaluated for impairment	2	2
Loans receivables, collectively evaluated for impairment	261	293
Total	264	296	278
Total consumer [Member] | Acquired loans [Member]
Activity in the allowance for credit losses for the periods indicated
Total	2,250		2,347
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	2	1
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	2	1
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2	1
Total	2	1
Loans receivables, individually evaluated for impairment	0	0
Loans receivables, collectively evaluated for impairment	0	0
Loans acquired with deteriorated credit quality	1,194	1,491
Total	1,194	1,491	1,257
Total consumer [Member] | Acquired loans [Member] | Home equity [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	2	3
Provision for loan losses	1	2
Charge-offs	-1	-2
Recoveries	0	0
Balance at end of period	3	3
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3	3
Total	3	3
Loans receivables, individually evaluated for impairment	4	4
Loans receivables, collectively evaluated for impairment	939	999
Loans acquired with deteriorated credit quality	113	160
Total	1,056	1,162	1,089
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member]
Activity in the allowance for credit losses for the periods indicated
Total	0		0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	0	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Total	0	0
Loans receivables, individually evaluated for impairment	0	0
Loans receivables, collectively evaluated for impairment	0	0
Loans acquired with deteriorated credit quality	0	0
Total	0	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member]
Activity in the allowance for credit losses for the periods indicated
Balance at beginning of period	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Balance at end of period	0	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Total	0	0
Loans receivables, individually evaluated for impairment	0	0
Loans receivables, collectively evaluated for impairment	0	0
Loans acquired with deteriorated credit quality	0	0
Total	$0	$0	$0

Loans_and_Leases_Nonperforming

Loans and Leases - Nonperforming Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Summary of nonaccruing loans
Nonaccruing loans	$228	$204
Total commercial [Member]
Summary of nonaccruing loans
Nonaccruing loans	127	106
Total commercial [Member] | Commercial real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	66	53
Total commercial [Member] | Business [Member]
Summary of nonaccruing loans
Nonaccruing loans	61	53
Total consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	101	98
Total consumer [Member] | Residential real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	33	34
Total consumer [Member] | Home equity [Member]
Summary of nonaccruing loans
Nonaccruing loans	49	47
Total consumer [Member] | Indirect auto [Member]
Summary of nonaccruing loans
Nonaccruing loans	13	13
Total consumer [Member] | Other consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	5	5
Originated loans [Member]
Summary of nonaccruing loans
Nonaccruing loans	198	174
Originated loans [Member] | Total commercial [Member]
Summary of nonaccruing loans
Nonaccruing loans	120	98
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	66	53
Originated loans [Member] | Total commercial [Member] | Business [Member]
Summary of nonaccruing loans
Nonaccruing loans	55	45
Originated loans [Member] | Total consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	77	75
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	33	34
Originated loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of nonaccruing loans
Nonaccruing loans	26	24
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member]
Summary of nonaccruing loans
Nonaccruing loans	13	13
Originated loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	5	5
Acquired loans [Member]
Summary of nonaccruing loans
Nonaccruing loans	30	30
Acquired loans [Member] | Total commercial [Member]
Summary of nonaccruing loans
Nonaccruing loans	7	7
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	0	0
Acquired loans [Member] | Total commercial [Member] | Business [Member]
Summary of nonaccruing loans
Nonaccruing loans	7	7
Acquired loans [Member] | Total consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	23	23
Acquired loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of nonaccruing loans
Nonaccruing loans	0	0
Acquired loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of nonaccruing loans
Nonaccruing loans	23	23
Acquired loans [Member] | Total consumer [Member] | Indirect auto [Member]
Summary of nonaccruing loans
Nonaccruing loans	0	0
Acquired loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of nonaccruing loans
Nonaccruing loans	$0	$0

Loans_and_Leases_Interest_Inco

Loans and Leases - Interest Income Foregone (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Details of additional information on loans
Additional interest income that would have been recorded if nonperforming loans were performing in accordance with original terms	$3	$2

Loans_and_Leases_Impaired_Loan

Loans and Leases - Impaired Loans (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of impaired loans
Recorded investment	$192		$163
Total commercial [Member]
Summary of impaired loans
Recorded investment	155		128
Total commercial [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	90		69
Unpaid principal balance	136		110
Related allowance	0		0
Total commercial [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	62		56
Unpaid principal balance	80		70
Related allowance	8		4
Total consumer [Member]
Summary of impaired loans
Recorded investment	37		35
Total consumer [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	22		16
Unpaid principal balance	28		18
Related allowance	0		0
Total consumer [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	11		16
Unpaid principal balance	11		17
Related allowance	1		2
Originated loans [Member]
Summary of impaired loans
Recorded investment	186		156
Unpaid principal balance	255		215
Related allowance	9		6
Average recorded investment	189	148
Interest income recognized	1	1
Originated loans [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	113		85
Unpaid principal balance	164		128
Related allowance	0		0
Originated loans [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	73		71
Unpaid principal balance	91		87
Related allowance	9		6
Originated loans [Member] | Total commercial [Member]
Summary of impaired loans
Recorded investment	152		125
Unpaid principal balance	217		179
Related allowance	8		4
Average recorded investment	155	117
Interest income recognized	1	1
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of impaired loans
Recorded investment	76		64
Unpaid principal balance	102		86
Related allowance	5		2
Average recorded investment	77	62
Interest income recognized	0	0
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	42		40
Unpaid principal balance	62		59
Related allowance	0		0
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	35		24
Unpaid principal balance	41		27
Related allowance	5		2
Originated loans [Member] | Total commercial [Member] | Business [Member]
Summary of impaired loans
Recorded investment	76		61
Unpaid principal balance	114		93
Related allowance	3		2
Average recorded investment	78	55
Interest income recognized	0	0
Originated loans [Member] | Total commercial [Member] | Business [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	49		29
Unpaid principal balance	75		51
Related allowance	0		0
Originated loans [Member] | Total commercial [Member] | Business [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	27		32
Unpaid principal balance	40		43
Related allowance	3		2
Originated loans [Member] | Total consumer [Member]
Summary of impaired loans
Recorded investment	33		31
Unpaid principal balance	38		36
Related allowance	1		2
Average recorded investment	33	31
Interest income recognized	0	0
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of impaired loans
Recorded investment	22		20
Unpaid principal balance	24		22
Related allowance	1		1
Average recorded investment	22	20
Interest income recognized	0	0
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	15		8
Unpaid principal balance	17		9
Related allowance	0		0
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	7		11
Unpaid principal balance	7		13
Related allowance	1		1
Originated loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of impaired loans
Recorded investment	6		7
Unpaid principal balance	7		8
Related allowance	0		1
Average recorded investment	6	6
Interest income recognized	0	0
Originated loans [Member] | Total consumer [Member] | Home equity [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	4		3
Unpaid principal balance	5		4
Related allowance	0		0
Originated loans [Member] | Total consumer [Member] | Home equity [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	2		4
Unpaid principal balance	2		4
Related allowance	0		1
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member]
Summary of impaired loans
Recorded investment	3		2
Unpaid principal balance	4		3
Related allowance	0		0
Average recorded investment	3	2
Interest income recognized	0	0
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	2		2
Unpaid principal balance	3		3
Related allowance	0		0
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	1		0
Unpaid principal balance	1		0
Related allowance	0		0
Originated loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of impaired loans
Recorded investment	2		2
Unpaid principal balance	3		2
Related allowance	0		0
Average recorded investment	3	2
Interest income recognized	0	0
Originated loans [Member] | Total consumer [Member] | Other consumer [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	1		2
Unpaid principal balance	1		2
Related allowance	0		0
Originated loans [Member] | Total consumer [Member] | Other consumer [Member] | With a related allowance recorded [Member]
Summary of impaired loans
Recorded investment	1		0
Unpaid principal balance	1		0
Related allowance	0		0
Acquired loans [Member]
Summary of impaired loans
Average recorded investment	7	11
Interest income recognized	0	0
Acquired loans [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	7		7
Unpaid principal balance	8		9
Related allowance	0		0
Acquired loans [Member] | Total commercial [Member]
Summary of impaired loans
Average recorded investment	3	8
Interest income recognized	0	0
Acquired loans [Member] | Total commercial [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	3		3
Unpaid principal balance	3		3
Related allowance	0		0
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Summary of impaired loans
Average recorded investment	0	0
Interest income recognized	0	0
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Acquired loans [Member] | Total commercial [Member] | Business [Member]
Summary of impaired loans
Average recorded investment	3	8
Interest income recognized	0	0
Acquired loans [Member] | Total commercial [Member] | Business [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	3		3
Unpaid principal balance	3		3
Related allowance	0		0
Acquired loans [Member] | Total consumer [Member]
Summary of impaired loans
Average recorded investment	4	4
Interest income recognized	0	0
Acquired loans [Member] | Total consumer [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	4		4
Unpaid principal balance	5		6
Related allowance	0		0
Acquired loans [Member] | Total consumer [Member] | Residential real estate [Member]
Summary of impaired loans
Average recorded investment	0	0
Interest income recognized	0	0
Acquired loans [Member] | Total consumer [Member] | Residential real estate [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Acquired loans [Member] | Total consumer [Member] | Home equity [Member]
Summary of impaired loans
Average recorded investment	4	4
Interest income recognized	0	0
Acquired loans [Member] | Total consumer [Member] | Home equity [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	4		4
Unpaid principal balance	5		6
Related allowance	0		0
Acquired loans [Member] | Total consumer [Member] | Other consumer [Member]
Summary of impaired loans
Average recorded investment	0	0
Interest income recognized	0	0
Acquired loans [Member] | Total consumer [Member] | Other consumer [Member] | With no related allowance recorded [Member]
Summary of impaired loans
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	$0		$0

Loans_and_Leases_Reconciliatio

Loans and Leases - Reconciliation of Nonperforming Loans to Impaired Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Reconciliation between nonaccrual loans and impaired loans [Line Items]
Nonaccrual loans	$228	$204
Plus: Accruing TDRs	64	67
Less : Smaller balance nonaccrual loans evaluated collectively when determining the allowance for loan losses	-100	-108
Total impaired loans	192	163
Total commercial [Member]
Reconciliation between nonaccrual loans and impaired loans [Line Items]
Nonaccrual loans	127	106
Plus: Accruing TDRs	56	59
Less : Smaller balance nonaccrual loans evaluated collectively when determining the allowance for loan losses	-28	-36
Total impaired loans	155	128
Total consumer [Member]
Reconciliation between nonaccrual loans and impaired loans [Line Items]
Nonaccrual loans	101	98
Plus: Accruing TDRs	8	8
Less : Smaller balance nonaccrual loans evaluated collectively when determining the allowance for loan losses	-72	-71
Total impaired loans	$37	$35

Loans_and_Leases_Past_Due_Agin

Loans and Leases - Past Due Aging Analysis (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Aging analysis of loans
Total	$23,118		$23,037
Total commercial [Member]
Aging analysis of loans
Total	14,078		13,979
Total commercial [Member] | Business [Member]
Aging analysis of loans
Total	5,791		5,775
Total consumer [Member]
Aging analysis of loans
Total	9,040		9,058
Total consumer [Member] | Residential real estate [Member]
Aging analysis of loans
Total	3,330		3,353
Total consumer [Member] | Home equity [Member]
Aging analysis of loans
Total	2,944		2,936
Total consumer [Member] | Indirect auto [Member]
Aging analysis of loans
Total	2,201		2,166
Originated loans [Member]
Aging analysis of loans
30-59 days past due	50		41
60-89 days past due	13		19
Greater than 90 days past due	94		95
Total past due	157		154
Current	19,371		19,141
Total	19,529		19,296	17,389
Greater than 90 days and accruing	3	[1]	2
Originated loans [Member] | Total commercial [Member]
Aging analysis of loans
30-59 days past due	26		11
60-89 days past due	7		9
Greater than 90 days past due	48		49
Total past due	80		69
Current	12,658		12,515
Total	12,738		12,584
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Aging analysis of loans
30-59 days past due	6		7
60-89 days past due	5		2
Greater than 90 days past due	34		31
Total past due	45		40
Current	7,246		7,113
Total	7,291		7,154	6,575
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total commercial [Member] | Business [Member]
Aging analysis of loans
30-59 days past due	19		5
60-89 days past due	2		7
Greater than 90 days past due	14		17
Total past due	36		28
Current	5,412		5,402
Total	5,448		5,430	5,053
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total consumer [Member]
Aging analysis of loans
30-59 days past due	25		29
60-89 days past due	7		10
Greater than 90 days past due	45		46
Total past due	77		85
Current	6,713		6,626
Total	6,790		6,711
Greater than 90 days and accruing	3		2
Originated loans [Member] | Total consumer [Member] | Residential real estate [Member]
Aging analysis of loans
30-59 days past due	5		4
60-89 days past due	1		2
Greater than 90 days past due	19		21
Total past due	25		27
Current	2,111		2,069
Total	2,136		2,096	1,898
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total consumer [Member] | Home equity [Member]
Aging analysis of loans
30-59 days past due	3		3
60-89 days past due	1		1
Greater than 90 days past due	16		15
Total past due	20		19
Current	1,868		1,828
Total	1,888		1,847	1,605
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total consumer [Member] | Indirect auto [Member]
Aging analysis of loans
30-59 days past due	13		17
60-89 days past due	2		4
Greater than 90 days past due	5		5
Total past due	21		27
Current	2,180		2,139
Total	2,201		2,166	1,655
Greater than 90 days and accruing	0		0
Originated loans [Member] | Total consumer [Member] | Credit cards [Member]
Aging analysis of loans
30-59 days past due	1		2
60-89 days past due	1		2
Greater than 90 days past due	3		2
Total past due	5		6
Current	296		318
Total	301		324	306
Greater than 90 days and accruing	3		2
Originated loans [Member] | Total consumer [Member] | Other consumer [Member]
Aging analysis of loans
30-59 days past due	2		3
60-89 days past due	1		1
Greater than 90 days past due	3		3
Total past due	6		7
Current	258		271
Total	264		278	296
Greater than 90 days and accruing	0		0
Acquired loans [Member]
Aging analysis of loans
30-59 days past due	21		21
60-89 days past due	10		9
Greater than 90 days past due	102		109
Total past due	133		139
Current	3,456		3,603
Total	3,590		3,742	4,362
Greater than 90 days and accruing	84		91
Acquired loans [Member] | Total commercial [Member]
Aging analysis of loans
30-59 days past due	4		3
60-89 days past due	2		3
Greater than 90 days past due	30		33
Total past due	37		38
Current	1,303		1,357
Total	1,340		1,395
Greater than 90 days and accruing	27		30
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Aging analysis of loans
30-59 days past due	4		3
60-89 days past due	2		3
Greater than 90 days past due	24		26
Total past due	29		31
Current	967		1,019
Total	996		1,050	1,292
Greater than 90 days and accruing	24		26
Acquired loans [Member] | Total commercial [Member] | Business [Member]
Aging analysis of loans
30-59 days past due	1		0
60-89 days past due	1		0
Greater than 90 days past due	7		7
Total past due	8		7
Current	335		338
Total	343		345	417
Greater than 90 days and accruing	4		4
Acquired loans [Member] | Total consumer [Member]
Aging analysis of loans
30-59 days past due	17		17
60-89 days past due	8		7
Greater than 90 days past due	72		77
Total past due	96		101
Current	2,154		2,246
Total	2,250		2,347
Greater than 90 days and accruing	57		62
Acquired loans [Member] | Total consumer [Member] | Residential real estate [Member]
Aging analysis of loans
30-59 days past due	11		11
60-89 days past due	5		5
Greater than 90 days past due	52		56
Total past due	68		72
Current	1,126		1,186
Total	1,194		1,257	1,491
Greater than 90 days and accruing	52		56
Acquired loans [Member] | Total consumer [Member] | Home equity [Member]
Aging analysis of loans
30-59 days past due	5		6
60-89 days past due	3		2
Greater than 90 days past due	20		21
Total past due	28		29
Current	1,027		1,060
Total	1,056		1,089	1,162
Greater than 90 days and accruing	5		6
Acquired loans [Member] | Total consumer [Member] | Indirect auto [Member]
Aging analysis of loans
Total	0		0
Acquired loans [Member] | Total consumer [Member] | Credit cards [Member]
Aging analysis of loans
Total	0		0	0
Acquired loans [Member] | Total consumer [Member] | Other consumer [Member]
Aging analysis of loans
Total	$0		$0	$0
[1]	Includes credit card loans, loans that have matured and are in the process of collection, and acquired loans that were originally recorded at fair value upon acquisition. Acquired loans are considered to be accruing as we can reasonably estimate future cash flows on these acquired loans and we expect to fully collect the carrying value of these loans net of the allowance for acquired loan losses. Therefore, we are accreting the difference between the carrying value of these loans and their expected cash flows into interest income.

Loans_and_Leases_Commercial_Cr

Loans and Leases - Commercial Credit Quality Indicators (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Information about the credit quality of our commercial loan portfolio
Loans receivable	$23,118	$23,037
Total commercial [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	14,078	13,979
Total commercial [Member] | Business [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	5,791	5,775
Originated loans [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	19,529	19,296	17,389
Originated loans [Member] | Total commercial [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	12,738	12,584
Percent of total	100.00%	100.00%
Originated loans [Member] | Total commercial [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	12,058	11,858
Percent of total	94.70%	94.20%
Originated loans [Member] | Total commercial [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	680	726
Percent of total	5.30%	5.80%
Originated loans [Member] | Total commercial [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	560	628
Percent of total	4.40%	5.00%
Originated loans [Member] | Total commercial [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	120	98
Percent of total	0.90%	0.80%
Originated loans [Member] | Total commercial [Member] | Business [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	5,448	5,430	5,053
Originated loans [Member] | Total commercial [Member] | Business [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	5,122	5,067
Originated loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	325	363
Originated loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	271	318
Originated loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	55	45
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	7,291	7,154	6,575
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	6,936	6,791
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	355	363
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	290	310
Originated loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	66	53
Acquired loans [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	3,590	3,742	4,362
Acquired loans [Member] | Total commercial [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	1,340	1,395
Percent of total	100.00%	100.00%
Acquired loans [Member] | Total commercial [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	1,190	1,243
Percent of total	88.80%	89.10%
Acquired loans [Member] | Total commercial [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	150	153
Percent of total	11.20%	10.90%
Acquired loans [Member] | Total commercial [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	143	145
Percent of total	10.70%	10.40%
Acquired loans [Member] | Total commercial [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	7	7
Percent of total	0.50%	0.50%
Acquired loans [Member] | Total commercial [Member] | Business [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	343	345	417
Acquired loans [Member] | Total commercial [Member] | Business [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	295	294
Acquired loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	49	51
Acquired loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	42	43
Acquired loans [Member] | Total commercial [Member] | Business [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	7	7
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	996	1,050	1,292
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Pass [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	895	948
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	101	102
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member] | Accrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	101	102
Acquired loans [Member] | Total commercial [Member] | Commercial real estate [Member] | Criticized [Member] | Nonaccrual [Member]
Information about the credit quality of our commercial loan portfolio
Loans receivable	$0	$0

Loans_and_Leases_Consumer_Cred

Loans and Leases - Consumer Credit Quality Indicators - FICO Score(Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Information about the credit quality of our consumer loan portfolio
Loans receivable	$23,118	$23,037
Originated loans [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	19,529	19,296	17,389
Acquired loans [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	3,590	3,742	4,362
Total consumer [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	9,040	9,058
Total consumer [Member] | Residential real estate [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	3,330	3,353
Total consumer [Member] | Home equity [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2,944	2,936
Total consumer [Member] | Indirect auto [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2,201	2,166
Total consumer [Member] | Originated loans [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	6,790	6,711
Percent of total	100.00%	100.00%
Total consumer [Member] | Originated loans [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	5,359	5,296
Percent of total	78.90%	78.90%
Total consumer [Member] | Originated loans [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	752	752
Percent of total	11.10%	11.20%
Total consumer [Member] | Originated loans [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	344	339
Percent of total	5.00%	5.00%
Total consumer [Member] | Originated loans [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	158	148
Percent of total	2.30%	2.20%
Total consumer [Member] | Originated loans [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	167	146
Percent of total	2.50%	2.20%
Total consumer [Member] | Originated loans [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	11	31
Percent of total	0.20%	0.50%
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2,136	2,096	1,898
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,880	1,841
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	128	124
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	55	62
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	33	28
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	35	32
Total consumer [Member] | Originated loans [Member] | Residential real estate [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	6	9
Total consumer [Member] | Originated loans [Member] | Home equity [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,888	1,847	1,605
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,553	1,529
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	184	182
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	77	71
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	35	31
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	37	32
Total consumer [Member] | Originated loans [Member] | Home equity [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2	1
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2,201	2,166	1,655
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,552	1,533
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	345	347
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	162	159
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	68	64
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	74	63
Total consumer [Member] | Originated loans [Member] | Indirect auto [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Originated loans [Member] | Credit cards [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	301	324	306
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	206	226
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	51	53
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	24	24
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	10	11
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	8	8
Total consumer [Member] | Originated loans [Member] | Credit cards [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2	3
Total consumer [Member] | Originated loans [Member] | Other consumer [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	264	278	296
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	168	167
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	45	46
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	25	24
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	12	13
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	13	12
Total consumer [Member] | Originated loans [Member] | Other consumer [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1	17
Total consumer [Member] | Acquired loans [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	2,250	2,347
Percent of total	100.00%	100.00%
Total consumer [Member] | Acquired loans [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,630	1,723
Percent of total	72.50%	73.40%
Total consumer [Member] | Acquired loans [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	188	180
Percent of total	8.40%	7.70%
Total consumer [Member] | Acquired loans [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	107	113
Percent of total	4.80%	4.80%
Total consumer [Member] | Acquired loans [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	91	88
Percent of total	4.00%	3.80%
Total consumer [Member] | Acquired loans [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	95	91
Percent of total	4.20%	3.90%
Total consumer [Member] | Acquired loans [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	139	151
Percent of total	6.10%	6.40%
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,194	1,257	1,491
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	809	872
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	93	87
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	58	61
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	53	49
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	60	57
Total consumer [Member] | Acquired loans [Member] | Residential real estate [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	121	131
Total consumer [Member] | Acquired loans [Member] | Home equity [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	1,056	1,089	1,162
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	821	851
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	95	93
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	50	52
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	38	40
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	35	34
Total consumer [Member] | Acquired loans [Member] | Home equity [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	17	20
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Indirect auto [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Credit cards [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | Over 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | 660 - 700 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | 620 - 660 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | 580 - 620 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | Less Than 580 [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	0	0
Total consumer [Member] | Acquired loans [Member] | Other consumer [Member] | No Score [Member]
Information about the credit quality of our consumer loan portfolio
Loans receivable	$0	$0

Loans_and_Leases_Summary_of_Tr

Loans and Leases - Summary of Troubled Debt Restructurings (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Aggregate recorded investment of impaired loans with terms through troubled debt restructuring
Accruing interest	$64		$67
Nonaccrual	54		53
Total troubled debt restructurings	$119	[1]	$120	[1]
[1]	Includes 93 and 87 acquired loans that were restructured with a recorded investment of $4 million and $4 million at March 31, 2015 and December 31, 2014

Loans_and_Leases_Troubled_Debt

Loans and Leases - Troubled Debt Restructuring by Concession Type (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
	Contract		Contract
Financing effects of our modifications
Count	98		139
Postmodification recorded investment	$5	[1]	$7	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total commercial [Member]
Financing effects of our modifications
Count	2		3
Postmodification recorded investment	0	[1]	3	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total commercial [Member] | Commercial real estate [Member] | Extension of term and rate reduction [Member]
Financing effects of our modifications
Count			1
Postmodification recorded investment			0	[1]
Premodification allowance for loan losses			0
Postmodification allowance for loan losses			0
Total commercial [Member] | Commercial Business [Member] | Extension of term [Member]
Financing effects of our modifications
Count			2
Postmodification recorded investment			3	[1]
Premodification allowance for loan losses			0
Postmodification allowance for loan losses			0
Commercial Business [Member] | Rate reduction [Member]
Financing effects of our modifications
Count	2
Postmodification recorded investment	0	[1]
Premodification allowance for loan losses	0
Postmodification allowance for loan losses	0
Total consumer [Member]
Financing effects of our modifications
Count	96		136
Postmodification recorded investment	5	[1]	4	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Residential real estate [Member] | Extension of term and rate reduction [Member]
Financing effects of our modifications
Count	4		4
Postmodification recorded investment	1	[1]	0	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Residential real estate [Member] | Extension of term [Member]
Financing effects of our modifications
Count	7		2
Postmodification recorded investment	1	[1]	0	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Residential real estate [Member] | Deferral of principal and extension of term [Member]
Financing effects of our modifications
Count			1
Postmodification recorded investment			0	[1]
Premodification allowance for loan losses			0
Postmodification allowance for loan losses			0
Total consumer [Member] | Residential real estate [Member] | Chapter 7 bankruptcy [Member]
Financing effects of our modifications
Count	5		8
Postmodification recorded investment	1	[1]	1	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Home equity [Member] | Extension of term and rate reduction [Member]
Financing effects of our modifications
Count	1
Postmodification recorded investment	0	[1]
Premodification allowance for loan losses	0
Postmodification allowance for loan losses	0
Total consumer [Member] | Home equity [Member] | Extension of term [Member]
Financing effects of our modifications
Count	1
Postmodification recorded investment	0	[1]
Premodification allowance for loan losses	0
Postmodification allowance for loan losses	0
Total consumer [Member] | Home equity [Member] | Deferral of principal and extension of term [Member]
Financing effects of our modifications
Count			2
Postmodification recorded investment			0	[1]
Premodification allowance for loan losses			0
Postmodification allowance for loan losses			0
Total consumer [Member] | Home equity [Member] | Chapter 7 bankruptcy [Member]
Financing effects of our modifications
Count	23		33
Postmodification recorded investment	1	[1]	1	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Indirect auto [Member] | Chapter 7 bankruptcy [Member]
Financing effects of our modifications
Count	53		86
Postmodification recorded investment	1	[1]	1	[1]
Premodification allowance for loan losses	0		0
Postmodification allowance for loan losses	0		0
Total consumer [Member] | Other consumer [Member] | Chapter 7 bankruptcy [Member]
Financing effects of our modifications
Count	2
Postmodification recorded investment	0	[1]
Premodification allowance for loan losses	0
Postmodification allowance for loan losses	$0
[1]	(1)Postmodification balances approximate premodification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant.

Loans_and_Leases_Information_a

Loans and Leases - Information about Residential Mortgage Banking (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Information about residential mortgage loans
Mortgages serviced for others	$3,869	$3,713
Mortgage servicing asset recorded for loans serviced for others, net	$37	$36

Loans_and_Leases_Details_Textu

Loans and Leases (Details Textual) (USD $)	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2014
	Segment			Contract
	acquisition
	payment
	Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonperforming loan held for sale as of March 31, 2015, sold and proceeds received on April 2, 2015	$5,000,000
Number of segments in portfolio	2
Liability for Unfunded Commitments	15,000,000			16,000,000
Provision for Credit Losses for Unfunded Commitments	-1,000,000	400,000
Home equity portfolio	2,900,000,000			2,900,000,000
Portion of Home Equity Portfolio in First Lien Position	1,200,000,000			1,100,000,000
Percentage of second lien home equity where first lien held and serviced	10.00%			10.00%
Number of acquisitions since January 1, 2009	4
Other changes in nonaccretable yield				55,000,000	[1]
Carrying value of impaired loans, less related allowance, as percent of principal	69.00%			70.00%
Minimum number of payments of restructured loan	6
Nonaccrual loans not modified in TDR minimum	1,000,000	200,000	1,000,000
Troubled debt restructures acquired loan portfolio count	93			87
Troubled debt restructures acquired loan portfolio	$4,000,000			$4,000,000
[1]	Includes changes in expected cash flows from changes in interest rate and prepayment assumptions.

Goodwill_Goodwill_Details

Goodwill Goodwill (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning	$2,449	$1,350
Acquisitions	1
Impairment	-1,100
Goodwill, ending	1,350	1,350
Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning	2,381
Acquisitions	0
Impairment	-1,100
Goodwill, ending	1,281
Financial Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning	68
Acquisitions	1
Impairment	0
Goodwill, ending	$69

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Notional Amount and Fair Value of Derivative Instruments (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Derivative financial instruments
Asset Derivatives, Notional Amount	$3,833		$3,633
Asset Derivatives, Fair Value	138	[1]	96	[1]
Liability Derivatives, Notional Amount	4,065		3,679
Liability Derivatives, Fair Value	142	[2]	97	[2]
Interest rate swap [Member] | Designated as Hedging Instrument [Member]
Derivative financial instruments
Asset Derivatives, Notional Amount	3		4
Asset Derivatives, Fair Value	0	[1]	0	[1]
Liability Derivatives, Notional Amount	230		30
Liability Derivatives, Fair Value	4	[2]	2	[2]
Interest rate swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative financial instruments
Asset Derivatives, Notional Amount	3,830		3,629
Asset Derivatives, Fair Value	138	[1]	96	[1]
Liability Derivatives, Notional Amount	3,836		3,649
Liability Derivatives, Fair Value	$139	[2]	$96	[2]
[1]	Represents gross amounts, included in Other Assets in our Consolidated Statements of Condition.
[2]	Represents gross amounts, included in Other Liabilities in our Consolidated Statements of Condition.

Derivative_Financial_Instrumen3

Derivative Financial Instruments Derivative Financial Instruments - Amount of Gain/Loss Recognized for FInancial Instruments (Details) (Interest rate swap [Member], Cash flow hedging [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest rate swap [Member] | Cash flow hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain on derivatives recognized in other comprehensive income, net of tax	($1)	$0

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details Textual) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net liability positions with counterparties			$93
Gross amounts of recognized liabilities to be offset with asset			96
Gross amounts of assets offsetting liabilities in the Statement of Condition			3
Collateral posted for net liability positions	227		130
Loss in accumulated other comprehensive income borrowings previously hedged	6	5	5	6
Terminated swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss in accumulated other comprehensive income borrowings previously hedged	5
Nonterminated swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss in accumulated other comprehensive income borrowings previously hedged	1
Customer swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative revenue	$3	$2

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Computation of basic and diluted earnings per share using two-class method
Net income available to common stockholders	$44	$53
Less income allocable to unvested restricted stock awards	0	0
Net income allocable to common stockholders	$44	$52
Weighted average common shares outstanding:
Total shares issued	366	366
Unallocated employee stock ownership plan shares	0	-2
Unvested restricted stock awards	-3	-2
Treasury shares	-13	-12
Total basic weighted average common shares outstanding	351	350
Effect of dilutive stock-based awards	2	2
Total diluted weighted average common shares outstanding	353	351
Basic earnings per common share	$0.12	$0.15
Diluted earnings per common share	$0.12	$0.15
Anti-dilutive stock-based awards excluded from the diluted weighted average common share calculations	11	11

Other_Comprehensive_Income_Com

Other Comprehensive Income - Comprehensive Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Securities available for sale:
Net unrealized holding gains arising during the period, pretax	$26		$14
Net unrealized holding gains arising during the period, tax	10		5
Net unrealized holding gains arising during the period, net of tax	16		9
Net unrealized holding gains on securities transferred between available for sale and held to maturity:
Amortization of net unrealized holding gains to income during the period, pre-tax	-2		-3
Amortization of net unrealized holding gains to income during the period, tax	-1		-1
Amortization of net unrealized holding gains to income during the period, net of tax	-2	[1]	-2	[1]
Net unrealized holding (losses) gains on securities transferred during the period	-2		-2
Interest rate swaps designated as cash flow hedges:
Net unrealized losses arising during the year, pretax	-2
Net unrealized losses arising during the year, tax	-1
Net unrealized losses arising during the year, net of tax	-1
Net unrealized losses on interest rate swaps designated as cash flow hedges, pretax	-1
Net unrealized losses on interest rate swaps designated as cash flow hedges, tax	-1
Net unrealized losses on interest rate swaps designated as cash flow hedges arising during the year	-1		0
Amortization of net loss related to pension and post-retirement plans, before tax	-1
Amortization of net loss related to pension and post-retirement plans, tax	0
Amortization of net loss related to pension and post-retirement plans, net of tax	-1		0
Total other comprehensive loss, pretax	23		11
Total other comprehensive loss, tax	8		4
Total other comprehensive income	$15		$7
[1]	Included in Interest income on investment securities and other in our Consolidated Statements of Income.

Other_Comprehensive_Income_Cha

Other Comprehensive Income - Change in Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated other comprehensive income
Net unrealized gains on securities available for sale, beginning balance	$52	$64
Net unrealized gains (losses) on securities transferred from available for sale and held to maturity, beginning balance	12	20
Unrealized loss on interest rate swaps designated as cash flow hedges, beginning balance	-5	-6
Pension and postretirement plans, beginning balance	-51	-16
Accumulated other comprehensive income (loss), net	9	62
Net unrealized gains on securities available for sale, period change, net of tax	16	9
Net unrealized (losses) gains on securities transferred from available for sale and held to maturity, period change, net of tax	-2	-2
Net unrealized losses on interest rate swaps designated as cash flow hedges arising during the year	-1	0
Pension and post-retirement plans, period change, net of tax	1	0
Total other comprehensive income, net	15	7
Net unrealized gains on securities available for sale, ending balance	68	73
Net unrealized gains (losses) on securities transferred from available for sale and held to maturity, ending balance	11	18
Unrealized loss on interest rate swaps designated as cash flow hedges, ending balance	-6	-5
Pension and postretirement plans, ending balance	-50	-16
Accumulated other comprehensive income, total, ending balance	23	69
Pre-tax net loss on cash flow hedges from accumulated other comprehensive income to earnings	$1

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value, Option, Loans Held for Sale (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Loans held for sale
Fair value carrying amount	$40	$35
Aggregate unpaid principal balance	39	34
Fair value carrying amount less aggregate unpaid principal balance	$1	$1

Fair_Value_Measurements_Fair_V1

Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Assets:
Investment securities available for sale	$5,911		$5,915
Loans held for sale	40		35
Debt securities [Member]
Assets:
Investment securities available for sale	1,599		1,492
Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	1,244		1,286
Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	1,006		1,032
Commercial mortgage-backed securities, non-agency issued [Member]
Assets:
Investment securities available for sale	1,397		1,500
Mortgage Backed Securities [Member]
Assets:
Investment securities available for sale	2,641		2,786
Collateralized loan obligations, non-agency issued [Member]
Assets:
Investment securities available for sale	1,146		1,016
States and political subdivisions [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	435		453
U.S. Treasury [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	55		25
U.S. government sponsored enterprises [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	275		191
Corporate [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	833		823
Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	33		34
Federal National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	94		100
Federal National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	668		682
Federal Home Loan Mortgage Corporation [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	112		120
Federal Home Loan Mortgage Corporation [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	337		350
Fair Value, Measurements, Recurring [Member]
Assets:
Investment securities available for sale	5,911		5,915
Loans held for sale	40	[1]	35	[1]
Derivatives	138		93
Total assets	6,090		6,043
Liabilities:
Derivatives	142		94
Fair Value, Measurements, Recurring [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	1,599		1,492
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	1,244		1,286
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	1,006		1,032
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities [Member]
Assets:
Investment securities available for sale	2,641		2,786
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations, non-agency issued [Member]
Assets:
Investment securities available for sale	1,146		1,016
Fair Value, Measurements, Recurring [Member] | States and political subdivisions [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	435		453
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	55		25
Fair Value, Measurements, Recurring [Member] | U.S. government sponsored enterprises [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	275		191
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	833		823
Fair Value, Measurements, Recurring [Member] | Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	33		34
Fair Value, Measurements, Recurring [Member] | Federal National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	94		100
Fair Value, Measurements, Recurring [Member] | Federal National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	668		682
Fair Value, Measurements, Recurring [Member] | Federal Home Loan Mortgage Corporation [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	112		120
Fair Value, Measurements, Recurring [Member] | Federal Home Loan Mortgage Corporation [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	337		350
Fair Value, Measurements, Recurring [Member] | Non-agency issued [Member] | Commercial mortgage-backed securities, non-agency issued [Member]
Assets:
Investment securities available for sale	1,397		1,500
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Assets:
Investment securities available for sale	504		599
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Student Loans [Member]
Assets:
Investment securities available for sale	230		235
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Credit cards [Member]
Assets:
Investment securities available for sale	43		42
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Auto Loans [Member]
Assets:
Investment securities available for sale	149		194
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Other Loans [Member]
Assets:
Investment securities available for sale	83		127
Fair Value, Measurements, Recurring [Member] | Other securities [Member]
Assets:
Investment securities available for sale	22		22
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Investment securities available for sale	77		47
Total assets	77		47
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	55		25
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	55		25
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other securities [Member]
Assets:
Investment securities available for sale	21		21
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Investment securities available for sale	5,830		5,865
Loans held for sale	40	[1]	35	[1]
Derivatives	138		93
Total assets	6,008		5,993
Liabilities:
Derivatives	142		94
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	1,539		1,463
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	1,244		1,286
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	1,006		1,032
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
Assets:
Investment securities available for sale	2,641		2,786
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Collateralized loan obligations, non-agency issued [Member]
Assets:
Investment securities available for sale	1,146		1,016
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | States and political subdivisions [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	435		453
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. government sponsored enterprises [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	275		191
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	829		818
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Government National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	33		34
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Federal National Mortgage Association [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	94		100
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Federal National Mortgage Association [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	668		682
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Federal Home Loan Mortgage Corporation [Member] | Residential mortgage-backed securities [Member]
Assets:
Investment securities available for sale	112		120
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Federal Home Loan Mortgage Corporation [Member] | Collateralized mortgage obligations [Member]
Assets:
Investment securities available for sale	337		350
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-agency issued [Member] | Commercial mortgage-backed securities, non-agency issued [Member]
Assets:
Investment securities available for sale	1,397		1,500
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member]
Assets:
Investment securities available for sale	504		599
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member] | Student Loans [Member]
Assets:
Investment securities available for sale	230		235
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member] | Credit cards [Member]
Assets:
Investment securities available for sale	43		42
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member] | Auto Loans [Member]
Assets:
Investment securities available for sale	149		194
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member] | Other Loans [Member]
Assets:
Investment securities available for sale	83		127
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other securities [Member]
Assets:
Investment securities available for sale	1		1
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Investment securities available for sale	4		4
Total assets	4		4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	4		4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate [Member] | Debt securities [Member]
Assets:
Investment securities available for sale	$4		$4
[1]	Represents loans for which we have elected the fair value option.

Fair_Value_Measurements_Fair_V2

Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of assets and liabilities measured at fair value on a nonrecurring basis
Collateral dependent impaired loans	$18	$26
Level 1 [Member]
Summary of assets and liabilities measured at fair value on a nonrecurring basis
Collateral dependent impaired loans	0	0
Level 2 [Member]
Summary of assets and liabilities measured at fair value on a nonrecurring basis
Collateral dependent impaired loans	9	20	10
Level 3 [Member]
Summary of assets and liabilities measured at fair value on a nonrecurring basis
Collateral dependent impaired loans	9	6
Collateral Dependent Impaired Loans [Member]
Summary of assets and liabilities measured at fair value on a nonrecurring basis
Total gains (losses)	($2)	($2)

Fair_Value_Measurements_Fair_V3

Fair Value Measurements - Fair Value of Financial Instruments by Balance Sheet Grouping (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financial assets:
Cash and cash equivalents	$388		$420		$503	$463
Investment securities available for sale	5,911		5,915
Investment securities held to maturity	6,215		5,942
Investment securities held to maturity	6,302		5,964
Federal Home Loan Bank and Federal Reserve Bank common stock	375		412
Loans held for sale	49		40
Asset Derivatives, Fair Value	138	[1]	96	[1]
Financial liabilities:
Deposits	28,250		27,781
Liability Derivatives, Fair Value	142	[2]	97	[2]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Level 1 [Member]
Financial assets:
Cash and cash equivalents	388		420
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair value inputs level 1, 2, 3 [Member]
Financial assets:
Investment securities available for sale	5,911	[3]	5,915	[3]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Level 2 [Member]
Financial assets:
Investment securities held to maturity	6,215		5,942
Federal Home Loan Bank and Federal Reserve Bank common stock	375		412
Loans held for sale	49		40
Derivatives	138		93
Accrued interest receivable	105		101
Financial liabilities:
Deposits	28,250		27,781
Borrowings	5,973		6,206
Derivatives	142		94
Accrued interest payable	12		11
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair value inputs level 2, 3 [Member]
Financial assets:
Loans and leases, net	22,887	[4]	22,803	[4]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
Financial assets:
Cash and cash equivalents, fair value	388		420
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair value inputs level 1, 2, 3 [Member]
Financial assets:
Investment securities available for sale	5,911	[3]	5,915	[3]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
Financial assets:
Investment securities held to maturity	6,302		5,964
Federal Home Loan Bank and Federal Reserve Bank common stock	375		412
Loans held for sale	49		40
Asset Derivatives, Fair Value	138		93
Accrued interest receivable	105		101
Financial liabilities:
Deposits	28,265		27,793
Borrowings	5,985		6,215
Liability Derivatives, Fair Value	142		94
Accrued interest payable	12		11
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair value inputs level 2, 3 [Member]
Financial assets:
Loans and leases, net	$23,167	[4]	$23,037	[4]
[1]	Represents gross amounts, included in Other Assets in our Consolidated Statements of Condition.
[2]	Represents gross amounts, included in Other Liabilities in our Consolidated Statements of Condition.
[3]	For a detailed breakout of our investment securities available for sale, refer to our table of recurring fair value measurements.
[4]	Loans and leases classified as level 2 are made up of $9 million and $10 million of collateral dependent impaired loans without significant adjustments made to appraised values at March 31, 2015 and December 31, 2014, respectively. All other loans and leases are classified as level 3.

Fair_Value_Measurements_Detail

Fair Value Measurements (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities price at broker quotes	$0
Maximum days for completion of appraisals or evaluations for assets	90 days
Original maturity period for cash and cash equivalents (3 months or less)	3 months
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans fair value disclosure	18,000,000	26,000,000
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net increase in allowance for credit losses	2,000,000	2,000,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans fair value disclosure	$9,000,000	$20,000,000	$10,000,000

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	Segment
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Financial information of business segments
Net interest income	$263	$271
Provision for credit losses	13	24
Net interest income after provision for credit losses	250	247
Noninterest income	82	77
Amortization of intangibles	6	8
Goodwill impairment			1,100
Other noninterest expense	255	241
Income before income taxes	71	75
Income tax	20	15
Net income	51	60
Banking [Member]
Financial information of business segments
Net interest income	263	271
Provision for credit losses	13	24
Net interest income after provision for credit losses	250	247
Noninterest income	67	61
Amortization of intangibles	6	7
Goodwill impairment			1,100
Other noninterest expense	241	227
Income before income taxes	70	74
Income tax	19	14
Net income	50	60
Financial services [Member]
Financial information of business segments
Net interest income	0	0
Provision for credit losses	0	0
Net interest income after provision for credit losses	0	0
Noninterest income	16	16
Amortization of intangibles	1	1
Goodwill impairment			0
Other noninterest expense	13	14
Income before income taxes	2	1
Income tax	1	0
Net income	$1	$1

Condensed_Parent_Company_Only_2

Condensed Parent Company Only Financial Statements Condensed Parent Company Only Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
ASSETS
Cash and cash equivalents	$388	$420	$503	$463
Investment securities available for sale	5,911	5,915
Other assets	838	769
Total assets	38,907	38,551
LIABILITIES AND STOCKHOLDERS’ EQUITY
Stockholders' equity	4,125	4,093	5,027	4,993
Total liabilities and stockholders’ equity	38,907	38,551
Parent Company [Member]
ASSETS
Cash and cash equivalents	383	383	386	390
Investment in subsidiary	4,420	4,388
Deferred taxes	30	32
Other assets	14	13
Total assets	4,847	4,815
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and other liabilities	11	12
Borrowings	711	710
Stockholders' equity	4,125	4,093
Total liabilities and stockholders’ equity	$4,847	$4,815

Condensed_Parent_Company_Only_3

Condensed Parent Company Only Financial Statements Condensed Parent Company Only Income Statement (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Statements of Operations
Total interest and dividend income	$297	$300
Interest expense	34	29
Net interest income	263	271
Noninterest income	82	77
Noninterest expense	261	249
(Loss) income before income taxes and undisbursed income of subsidiary	71	75
Income tax benefit	20	15
Net income	51	60
Preferred stock dividend	8	8
Net income available to common stockholders	44	53
Other comprehensive income(1)	15	7
Total comprehensive (loss) income	66	67
Parent Company [Member]
Condensed Statements of Operations
Interest income	0	0
Dividends received from subsidiary	0	40
Total interest and dividend income	0	40
Interest expense	12	11
Net interest income	-12	29
Noninterest income	0	1
Noninterest expense	5	7
(Loss) income before income taxes and undisbursed income of subsidiary	-17	23
Income tax benefit	-7	-6
(Loss) income before undisbursed income of subsidiary	-11	29
Undisbursed income of subsidiary	62	30
Net income	51	59
Preferred stock dividend	8	8
Net income available to common stockholders	44	52
Total comprehensive (loss) income	$66	$66

Condensed_Parent_Company_Only_4

Condensed Parent Company Only Financial Statements Condensed Parent Company Only Statement of Cash Flows (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$51	$60
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income tax expense (benefit)	10	-20
Net cash provided by operating activities	45	154
Proceeds from Maturities of Available for Sale Securities	67	92
Cash flows from investing activities:
Principal payments received on securities available for sale	267	294
Purchases of securities available for sale	-315	-18
Proceeds from sales of securities available for sale	25	10
Other, net	-20	-6
Net cash used in investing activities	-277	-326
Cash flows from financing activities:
Dividends paid on preferred stock	-8	-8
Dividends paid on common stock	-28	-28
Net cash provided by financing activities	200	212
Net (decrease) increase in cash and cash equivalents	-32	40
Cash and cash equivalents at beginning of period	420	463
Cash and cash equivalents at end of period	388	503
Parent Company [Member]
Cash flows from operating activities:
Net income	51	59
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Undisbursed loss (income) of subsidiaries	-62	-30
Stock-based compensation expense	2	2
Deferred income tax expense (benefit)	-2	2
Decrease in other assets	-2	4
Decrease in other liabilities	-1	-1
Net cash provided by operating activities	-9	29
Proceeds from Maturities of Available for Sale Securities	0	2
Cash flows from investing activities:
Net cash used in investing activities	0	2
Cash flows from financing activities:
Return of capital from subsidiary	45	0
Dividends paid on preferred stock	-8	-8
Dividends paid on common stock	-28	-28
Net cash provided by financing activities	9	-36
Net (decrease) increase in cash and cash equivalents	0	-4
Cash and cash equivalents at beginning of period	383	390
Cash and cash equivalents at end of period	$383	$386