Loans TDR Modifications (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 contracts		Mar. 31, 2011 contracts
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	1,278		790
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	$ 7	[1]	$ 50	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	56	[3]	135	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	26		31
total modifications	89		216
PrincipalForgivenessRestructuringImpact	1		1
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	180		341
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	19		74
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	103		22
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	8	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	1	[3]	0	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	12		5
total modifications	13		13
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	11		10
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	2		2
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	10		16
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	6	[1]	18	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	1	[3]	16	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	2		12
total modifications	9		46
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	4		4
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	4		0
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	7		74
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	1	[1]	24	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	2	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	1		10
total modifications	2		36
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	3		6
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	2		9
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	225		270
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	0	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	20	[3]	81	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	1		3
total modifications	21		84
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	28		240
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	5		52
Residential Portfolio Segment [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	384		345
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	0	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	31	[3]	31	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	1		0
total modifications	32		31
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	43		64
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	3		7
Residential Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	35		23
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	0	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	5	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	9		0
total modifications	9		5
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	11		15
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	2		4
Consumer Portfolio Segment [Member] | Consumer Other Direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	12		40
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	0	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	0	[4]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	0		1
total modifications	0		1
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	2		2
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	0		0
Consumer Portfolio Segment [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	502
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	3	[3]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	0
total modifications	3
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	78
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	$ 1

[1] Restructured loans which had forgiveness of amounts contractually due under the terms of the loan typically have had multiple concessions including rate modifications and/or term extensions. The total amount of charge-offs associated with principal forgiveness for the Commercial segment during the three months ended March 31, 2012 was less than $1 million. There was no principal forgiveness for Residential or Consumer loans during the three months ended March 31, 2012.

[2] Restructured loans which had forgiveness of amounts contractually due under the terms of the loan typically have had multiple concessions including rate modifications and/or term extensions. The total amount of charge-offs associated with principal forgiveness for the Commercial segment during the three months ended March 31, 2011 was $1 million. There was no principal forgiveness for Residential or Consumer loans during the three months ended March 31, 2011.

[3] Restructured loans which had a modification of the loan's contractual interest rate may also have had an extension of the loan's contractual maturity date and/or other concessions. The financial effect of modifying the interest rate on the loans modified as a TDR was immaterial to the financial statements during the three months ended March 31, 2012.

[4] Restructured loans which had a modification of the loan's contractual interest rate may also have had an extension of the loan's contractual maturity date and/or other concessions. The financial effect of modifying the interest rate on the loans modified as a TDR was immaterial to the financial statements during the three months ended March 31, 2011.