Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (TDRs by Modification Type) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Total	$ 316	[1]	$ 949	[1]
Commercial [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	38	[1]	82	[1]
Commercial [Member] | TOTAL COMMERCIAL LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Principal Forgiveness	1		11
Rate Reduction	14		24
Other	23		47
Total	38		82
Commercial Real Estate [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	70	[1]	198	[1]
Commercial Real Estate [Member] | TOTAL COMMERCIAL LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Principal Forgiveness	29		64
Rate Reduction	26		97
Other	15		37
Total	70		198
Home Equity [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	63	[1]	263	[1]
Home Equity [Member] | TOTAL CONSUMER LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Rate Reduction	52		240
Other	11		23
Total	63		263
Residential Real Estate [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	112	[1]	293	[1]
Residential Real Estate [Member] | TOTAL CONSUMER LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Rate Reduction	70		210
Other	42		83
Total	112		293
Credit Card [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	30	[1]	105	[1]
Credit Card [Member] | TOTAL CONSUMER LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Rate Reduction	30		105
Total	30		105
Other Consumer Loans [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	3	[1]	8	[1]
Other Consumer Loans [Member] | TOTAL CONSUMER LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Rate Reduction			1
Other	3		7
Total	3		8
TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	108	[1]	280	[1]
TOTAL COMMERCIAL LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Principal Forgiveness	30	[2]	75	[2]
Rate Reduction	40	[2]	121	[2]
Other	38	[2]	84	[2]
Total	108	[2]	280	[2]
TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Total	208	[1]	669	[1]
TOTAL CONSUMER LENDING [Member] | Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Principal Forgiveness	0
Rate Reduction	152		556
Other	56		113
Total	208		669
Post TDR Recorded Investment [Member]
Financing Receivable, Modifications [Line Items]
Principal Forgiveness	30		75
Rate Reduction	192		677
Other	94		197
Total	$ 316		$ 949

[1] Impact of partial charge offs at TDR date are included in this table.

[2] Excludes less than $1 million of Equipment lease financing in Other TDRs.