Loans and Allowance for Credit Losses (Details 5) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 204,768	$ 197,061
Total outstanding commitments	407,594	386,530
Commercial Loan [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	50,792	44,595
Commercial Real Estate Loans [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,165	28,155
Residential Mortgage [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	33,879	29,355
Credit Card [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,873	16,262
Other Retail [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	48,066	47,906
Total Loans, Excluding Covered Loans [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	178,775	166,273
Covered Financing Receivable [Member] | Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,472	17,073
Pass Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	193,247	183,346
Total outstanding commitments	393,645	370,031
Commercial Loan [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,174	1,545
Commercial Real Estate Loans [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,010	1,540
Residential Mortgage [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	19	29
Other Retail [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	21	70
Total Loans, Excluding Covered Loans [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,224	3,184
Covered Financing Receivable [Member] | Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	208	283
Special Mention Criticized Internal Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,432	3,467
Total outstanding commitments	3,862	4,923
Commercial Loan [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,866	2,258
Commercial Real Estate Loans [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,428	5,000
Residential Mortgage [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,226	1,348
Credit Card [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	459	541
Other Retail [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	392	415
Total Loans, Excluding Covered Loans [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,371	9,562
Covered Financing Receivable [Member] | Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	718	686
Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,089	10,248
Total outstanding commitments	10,087	11,576
Commercial Loan [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,040	3,803
Commercial Real Estate Loans [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,438	6,540
Residential Mortgage [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,245	1,377
Credit Card [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	459	541
Other Retail [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	413	485
Total Loans, Excluding Covered Loans [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,595	12,746
Covered Financing Receivable [Member] | Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	926	969
Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,521	13,715
Total outstanding commitments	13,949	16,499
Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	53,832	48,398
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,603	34,695
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,124	30,732
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,332	16,803
Other Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	48,479	48,391
Total Loans, Excluding Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	189,370	179,019
Covered Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 15,398	$ 18,042