Loans and Allowance for Credit Losses (Details 5) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Summary of loans by portfolio type and the Company's internal credit quality rating
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
Total outstanding commitments	397,846	386,530
Pass Internal Credit Rating [Member]
Summary of loans by portfolio type and the Company's internal credit quality rating
Commercial	47,140	44,595
Commercial real estate	29,602	28,155
Residential mortgages	31,820	29,355
Credit card	15,642	16,262
Other retail, excluding credit cards	47,777	47,906
Total loans, excluding covered loans	171,981	166,273
Covered loans	15,388	17,073
Total loans	187,369	183,346
Total outstanding commitments	382,717	370,031
Special Mention Criticized Internal Credit Rating [Member]
Summary of loans by portfolio type and the Company's internal credit quality rating
Commercial	1,312	1,545
Commercial real estate	1,267	1,540
Residential mortgages	28	29
Credit card	0	0
Other retail, excluding credit cards	47	70
Total loans, excluding covered loans	2,654	3,184
Covered loans	204	283
Total loans	2,858	3,467
Total outstanding commitments	4,409	4,923
Classified Criticized Internal Credit Rating [Member]
Summary of loans by portfolio type and the Company's internal credit quality rating
Commercial	2,098	2,258
Commercial real estate	4,621	5,000
Residential mortgages	1,262	1,348
Credit card	469	541
Other retail, excluding credit cards	396	415
Total loans, excluding covered loans	8,846	9,562
Covered loans	809	686
Total loans	9,655	10,248
Total outstanding commitments	10,720	11,576
Total Criticized Internal Credit Rating [Member]
Summary of loans by portfolio type and the Company's internal credit quality rating
Commercial	3,410	3,803
Commercial real estate	5,888	6,540
Residential mortgages	1,290	1,377
Credit card	469	541
Other retail, excluding credit cards	443	485
Total loans, excluding covered loans	11,500	12,746
Covered loans	1,013	969
Total loans	12,513	13,715
Total outstanding commitments	$ 15,129	$ 16,499