Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Financial Impact of TDRs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Number of Loans	5,836	[1]	21,348	[1]
Pre-TDR Recorded Investment	$ 346	[1]	$ 1,027	[1]
Post-TDR Recorded Investment	316	[1]	949	[1]
Commercial [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	168	[1]	486	[1]
Pre-TDR Recorded Investment	45	[1]	101	[1]
Post-TDR Recorded Investment	38	[1]	82	[1]
Commercial Real Estate [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	16	[1]	57	[1]
Pre-TDR Recorded Investment	88	[1]	233	[1]
Post-TDR Recorded Investment	70	[1]	198	[1]
Equipment Lease Financing [Member] | TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	[1],[2]	2	[1],[2]
Home Equity [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	817	[1]	3,259	[1]
Pre-TDR Recorded Investment	64	[1]	264	[1]
Post-TDR Recorded Investment	63	[1]	263	[1]
Residential Real Estate [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	399	[1]	1,298	[1]
Pre-TDR Recorded Investment	116	[1]	316	[1]
Post-TDR Recorded Investment	112	[1]	293	[1]
Credit Card [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	4,305	[1]	15,943	[1]
Pre-TDR Recorded Investment	30	[1]	105	[1]
Post-TDR Recorded Investment	30	[1]	105	[1]
Other Consumer Loans [Member] | TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	129	[1]	303	[1]
Pre-TDR Recorded Investment	3	[1]	8	[1]
Post-TDR Recorded Investment	3	[1]	8	[1]
TOTAL COMMERCIAL LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	186	[1]	545	[1]
Pre-TDR Recorded Investment	133	[1]	334	[1]
Post-TDR Recorded Investment	108	[1]	280	[1]
TOTAL CONSUMER LENDING [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	5,650	[1]	20,803	[1]
Pre-TDR Recorded Investment	213	[1]	693	[1]
Post-TDR Recorded Investment	$ 208	[1]	$ 669	[1]

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

[2] Pre-TDR and Post-TDR amounts each total less than $1 million.