Loans and Allowance for Credit Losses (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 210,969	$ 203,222
30-89 Days Past Due	1,318	1,782
90 Days or More Past Due	1,315	1,753
Non performing	2,486	3,078
Total	216,088	209,835
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	61,107	55,991
30-89 Days Past Due	192	300
90 Days or More Past Due	40	45
Non performing	195	312
Total	61,534	56,648
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	35,769	34,800
30-89 Days Past Due	86	138
90 Days or More Past Due	12	14
Non performing	690	899
Total	36,557	35,851
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	38,597	35,664
30-89 Days Past Due	342	404
90 Days or More Past Due	321	364
Non performing	660	650
Total	39,920	37,082
Credit Card [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	16,315	16,662
30-89 Days Past Due	203	238
90 Days or More Past Due	198	236
Non performing	189	224
Total	16,905	17,360
Other Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	47,500	47,516
30-89 Days Past Due	261	340
90 Days or More Past Due	92	184
Non performing	182	67
Total	48,035	48,107
Total Loans, Excluding Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	199,288	190,633
30-89 Days Past Due	1,084	1,420
90 Days or More Past Due	663	843
Non performing	1,916	2,152
Total	202,951	195,048
Covered Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,681	12,589
30-89 Days Past Due	234	362
90 Days or More Past Due	652	910
Non performing	570	926
Total	$ 13,137	$ 14,787