Loans TDR Modifications (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 contracts		Sep. 30, 2011 contracts years
Financing Receivable, Modifications [Line Items]
PrincipalForgivenessRestructuringImpact	$ 3		$ 6
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	263	[1]	581	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	11	[3]	68	[4]
total modifications	274		649
Financing Receivable, Restructured During Period, Number Of Contracts	2,090		4,947
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	323	[5]	731	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	54	[5]	121	[6]
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	51	[1]	80	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	26	[4]
total modifications	51		106
Financing Receivable, Restructured During Period, Number Of Contracts	208		382
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	23	[5]	31	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	6	[5]	8	[6]
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	14	[1]	43	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	2	[3]	18	[4]
total modifications	16		61
Financing Receivable, Restructured During Period, Number Of Contracts	9		34
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	5	[5]	8	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	21	[5]	21	[6]
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	56	[1]	80	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	9	[3]	22	[4]
total modifications	65		102
Financing Receivable, Restructured During Period, Number Of Contracts	11		57
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	1	[5]	7	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	0	[5]	11	[6]
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	61	[1]	215	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	2	[4]
total modifications	61		217
Financing Receivable, Restructured During Period, Number Of Contracts	304		851
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	60	[5]	230	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	19	[5]	66	[6]
Residential Portfolio Segment [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	42	[1]	104	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	0	[4]
total modifications	42		104
Financing Receivable, Restructured During Period, Number Of Contracts	569		1,308
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	60	[5]	108	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	6	[5]	10	[6]
Residential Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	35	[1]	45	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	0	[4]
total modifications	35		45
Financing Receivable, Restructured During Period, Number Of Contracts	266		317
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	6	[5]	24	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	1	[5]	3	[6]
Consumer Portfolio Segment [Member] | Consumer Other Direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	0	[1]	3	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	0	[4]
total modifications	0		3
Financing Receivable, Restructured During Period, Number Of Contracts	7		61
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	2	[5]	2	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	0	[5]	0	[6]
Consumer Portfolio Segment [Member] | Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Amount Restructured During Period, Rate Mod and/or Term Extension	4	[1]	11	[2]
Financing Receivable, Amount Restructured During Period, Other Concessions Granted	0	[3]	0	[4]
total modifications	4		11
Financing Receivable, Restructured During Period, Number Of Contracts	716		1,937
Financing Receivable, Restructured, Payment Default During Peiriod, Number of Contracts	166	[5]	321	[6]
Financing Receivable, Restructured, Payment Default During Period, Amortized Cost at Default	$ 1	[5]	$ 2	[6]

[1] For these loans, borrowers received either a modification of the loan's contractual interest rate, an extension of the loan's contractual maturity date, or both. 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 September 30, 2011.

[2] For these loans, borrowers received either a modification of the loan's contractual interest rate, an extension of the loan's contractual maturity date, or both. The financial effect of modifying the interest rate on the loans modified as a TDR was immaterial to the financial statements during the nine months ended September 30, 2011.

[3] Restructured loans which had forgiveness of amounts contractually due under the terms of the loan typically have 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 September 30, 2011 was $3 million, substantially all of which related to Commercial construction. There was no principal forgiveness for Residential or Consumer loans during the three months ended September 30, 2011.

[4] Restructured loans which had forgiveness of amounts contractually due under the terms of the loan typically have 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 nine months ended September 30, 2011 was $6 million, substantially all of which related to Commercial construction. There was no principal forgiveness for Residential or Consumer loans during the nine months ended September 30, 2011.

[5] For the three months ended September 30, 2011, this represents defaults on loans that were first modified between the periods July 1, 2010 and September 30, 2011.

[6] For the nine months ended September 30, 2011, this represents defaults on loans that were first modified between the periods January 1, 2010 and September 30, 2011.