Loans and Allowance for Credit Losses (Details 6) (USD $) In Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	$ 7,698	$ 7,698	$ 4,948
Unpaid Principal Balance	10,930	10,930	7,808
Valuation Allowance	1,015	1,015	761
Commitments to Lend Additional Funds	168	168	97
Average recorded investment	7,179	6,236
Interest income recognized	56	121
Commercial Loan [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	637	637	596
Unpaid Principal Balance	1,596	1,596	1,631
Valuation Allowance	65	65	59
Commitments to Lend Additional Funds	27	27	80
Average recorded investment	536	529
Interest income recognized	4	7
Commercial Real Estate Loans [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	1,679	1,679	1,308
Unpaid Principal Balance	2,986	2,986	2,659
Valuation Allowance	148	148	118
Commitments to Lend Additional Funds	33	33	17
Average recorded investment	1,558	1,519
Interest income recognized	6	10
Residential Mortgage [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	2,588	2,588	2,440
Unpaid Principal Balance	3,018	3,018	2,877
Valuation Allowance	460	460	334
Average recorded investment	2,573	2,540
Interest income recognized	24	74
Credit Card [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	580	580	452
Unpaid Principal Balance	580	580	452
Valuation Allowance	226	226	218
Average recorded investment	492	471
Interest income recognized	4	10
Other Retail [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	179	179	152
Unpaid Principal Balance	180	180	189
Valuation Allowance	56	56	32
Average recorded investment	165	160
Interest income recognized	1	3
Total impaired loans, excluding GNMA and covered loans [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	5,663	5,663
Unpaid Principal Balance	8,360	8,360
Valuation Allowance	955	955
Commitments to Lend Additional Funds	60	60
Average recorded investment	5,324	5,219
Interest income recognized	39	104
Loans purchased from GNMA [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	866	866
Unpaid Principal Balance	866	866
Valuation Allowance	10	10
Average recorded investment	710	433
Interest income recognized	10	10
Covered Financing Receivable [Member]
Additional detail of impaired loans by portfolio type
Period-end Recorded Investment	1,169	1,169
Unpaid Principal Balance	1,704	1,704
Valuation Allowance	50	50
Commitments to Lend Additional Funds	108	108
Average recorded investment	1,145	584
Interest income recognized	$ 7	$ 7