Loans and Allowance for Credit Losses (Details 4) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Summary of loans by portfolio type
Commercial	$ 50,550	$ 48,398
Commercial real estate	35,490	34,695
Residential mortgages	33,110	30,732
Credit card	16,111	16,803
Other retail, excluding credit cards	48,220	48,391
Total loans, excluding covered loans	183,481	179,019
Covered loans	16,401	18,042
Total loans	199,882	197,061
Current Accruing [Member]
Summary of loans by portfolio type
Commercial	49,851	47,412
Commercial real estate	33,965	32,986
Residential mortgages	31,696	29,140
Credit card	15,426	15,993
Other retail, excluding credit cards	47,667	47,706
Total loans, excluding covered loans	178,605	173,237
Covered loans	13,842	14,951
Total loans	192,447	188,188
Due Past 30 to 89 Days Accruing [Member]
Summary of loans by portfolio type
Commercial	264	325
Commercial real estate	159	415
Residential mortgages	368	456
Credit card	216	269
Other retail, excluding credit cards	309	404
Total loans, excluding covered loans	1,316	1,869
Covered loans	590	757
Total loans	1,906	2,626
Due Past 90 Days Or More Accruing [Member]
Summary of loans by portfolio type
Commercial	43	64
Commercial real estate	2	1
Residential mortgages	375	500
Credit card	213	313
Other retail, excluding credit cards	171	216
Total loans, excluding covered loans	804	1,094
Covered loans	928	1,090
Total loans	1,732	2,184
Non Performing Loans Accruing [Member]
Summary of loans by portfolio type
Commercial	392	597
Commercial real estate	1,364	1,293
Residential mortgages	671	636
Credit card	256	228
Other retail, excluding credit cards	73	65
Total loans, excluding covered loans	2,756	2,819
Covered loans	1,041	1,244
Total loans	$ 3,797	$ 4,063