Loans and Allowance for Credit Losses (Details 6) (USD $) In Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Total Loans, Excluding Covered Loans [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	$ 5,245	$ 5,245	$ 4,948
Unpaid Principal Balance	8,450	8,450	7,808
Valuation Allowance	809	809	761
Commitments to Lend Additional Funds	44	44	97
Average recorded investment	5,182	5,167
Interest income recognized	33	65
Commercial Loan [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	414	414	596
Unpaid Principal Balance	1,488	1,488	1,631
Valuation Allowance	68	68	59
Commitments to Lend Additional Funds	12	12	80
Average recorded investment	503	525
Interest income recognized	2	3
Commercial Real Estate Loans [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	1,589	1,589	1,308
Unpaid Principal Balance	3,227	3,227	2,659
Valuation Allowance	122	122	118
Commitments to Lend Additional Funds	26	26	17
Average recorded investment	1,517	1,499
Interest income recognized	2	4
Residential Mortgage [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	2,610	2,610	2,440
Unpaid Principal Balance	3,065	3,065	2,877
Valuation Allowance	351	351	334
Commitments to Lend Additional Funds	6	6	0
Average recorded investment	2,541	2,524
Interest income recognized	25	50
Other Retail [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	164	164	152
Unpaid Principal Balance	202	202	189
Valuation Allowance	50	50	32
Commitments to Lend Additional Funds	0	0	0
Average recorded investment	159	158
Interest income recognized	1	2
Credit Card [Member]
Additional detail of impaired loans by portfolio type, excluding covered loans
Period-end Recorded Investment	468	468	452
Unpaid Principal Balance	468	468	452
Valuation Allowance	218	218	218
Commitments to Lend Additional Funds	0	0	0
Average recorded investment	462	461
Interest income recognized	$ 3	$ 6