Loans TDR Modifications (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 contracts		Dec. 31, 2012 contracts		Dec. 31, 2011 contracts
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	8,774	[1]	11,916	[1]	6,272	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	$ 19	[1],[2]	$ 29	[1],[3]	$ 106	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	270	[1],[5]	202	[1],[6]	478	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	346	[1]	385	[1],[8]	235	[1]
Financing Receivable, Amount Restructured During Period	635	[1]	616	[1]	819	[1]
Consumer Indirect [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	3,409	[1]	2,803	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	0	[1],[3]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	0	[1],[5]	0	[1],[6]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	65	[1]	49	[1],[8]
Financing Receivable, Amount Restructured During Period	65	[1]	49	[1]
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	152	[1]	358	[1]	510	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	18	[1],[2]	5	[1],[3]	28	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	2	[1],[5]	4	[1],[6]	45	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	105	[1]	23	[1],[8]	55	[1]
Financing Receivable, Amount Restructured During Period	125	[1]	32	[1]	128	[1]
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	6	[1]	33	[1]	43	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	20	[1],[3]	40	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	3	[1],[5]	7	[1],[6]	26	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	1	[1]	6	[1],[8]	22	[1]
Financing Receivable, Amount Restructured During Period	4	[1]	33	[1]	88	[1]
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	1	[1]	16	[1]	102	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	4	[1],[3]	38	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	0	[1],[5]	0	[1],[6]	8	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	0	[1]	14	[1],[8]	97	[1]
Financing Receivable, Amount Restructured During Period	0	[1]	18	[1]	143	[1]
Residential Nonguaranteed [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	1,584	[1]	2,804	[1]	967	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	1	[1],[2]	0	[1],[3]	0	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	166	[1],[5]	72	[1],[6]	233	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	94	[1]	125	[1],[8]	16	[1]
Financing Receivable, Amount Restructured During Period	261	[1]	197	[1]	249	[1]
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	2,630	[1]	3,790	[1]	1,737	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	0	[1],[3]	0	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	71	[1],[5]	110	[1],[6]	134	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	75	[1]	91	[1],[8]	6	[1]
Financing Receivable, Amount Restructured During Period	146	[1]	201	[1]	140	[1]
Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	259	[1]	564	[1]	367	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	0	[1],[3]	0	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	24	[1],[5]	1	[1],[6]	17	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	3	[1]	73	[1],[8]	36	[1]
Financing Receivable, Amount Restructured During Period	27	[1]	74	[1]	53	[1]
Consumer Other Direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	140	[1]	127	[1]	78	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	0	[1],[3]	0	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	1	[1],[5]	0	[1],[6]	1	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	3	[1]	4	[1],[8]	3	[1]
Financing Receivable, Amount Restructured During Period	4	[1]	4	[1]	4	[1]
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Restructured During Period, Number Of Contracts	593	[1]	1,421	[1]	2,468	[1]
Financing Receivable, Amount Restructured During Period, Principal Forgiveness Granted	0	[1],[2]	0	[1],[3]	0	[1],[4]
Financing Receivable, Amount Restructured During Period, Rate Modifications Granted	3	[1],[5]	8	[1],[6]	14	[1],[7]
Financing Receivable, Amount Restructured During Period, Term Extension and/or Other Concessions Granted	0	[1]	0	[1],[8]	0	[1]
Financing Receivable, Amount Restructured During Period	$ 3	[1]	$ 8	[1]	$ 14	[1]

[1] Includes loans modified under the terms of a TDR that were charged-off during the period.

[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 during the year ended December 31, 2013 was $2 million.

[3] 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 during the year ended December 31, 2012, was $9 million.

[4] 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 during the year ended December 31, 2011, was $17 million.

[5] 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 year ended December 31, 2013.

[6] 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 year ended December 31, 2012

[7] 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 year ended December 31, 2011.

[8] 4,231 of the residential loans, with an amortized cost of $201 million at December 31, 2012, relate to loans discharged in Chapter 7 bankruptcy that were reclassified as TDRs during 2012.