Loans and Allowance for Credit Losses (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 206,110	$ 203,222
30-89 Days Past Due	1,491	1,782
90 Days or More Past Due	1,492	1,753
Non performing	2,826	3,078
Total	211,919	209,835
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	58,225	55,991
30-89 Days Past Due	208	300
90 Days or More Past Due	45	45
Non performing	311	312
Total	58,789	56,648
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	35,163	34,800
30-89 Days Past Due	164	138
90 Days or More Past Due	16	14
Non performing	759	899
Total	36,102	35,851
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	37,086	35,664
30-89 Days Past Due	365	404
90 Days or More Past Due	304	364
Non performing	686	650
Total	38,441	37,082
Credit Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	15,936	16,662
30-89 Days Past Due	208	238
90 Days or More Past Due	221	236
Non performing	207	224
Total	16,572	17,360
Other Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	47,329	47,516
30-89 Days Past Due	279	340
90 Days or More Past Due	164	184
Non performing	65	67
Total	47,837	48,107
Total Loans, Excluding Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	193,739	190,633
30-89 Days Past Due	1,224	1,420
90 Days or More Past Due	750	843
Non performing	2,028	2,152
Total	197,741	195,048
Covered Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,371	12,589
30-89 Days Past Due	267	362
90 Days or More Past Due	742	910
Non performing	798	926
Total	$ 14,178	$ 14,787