Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Originated Impaired Loans) (Details) (USD $) In Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Associated Allowance	$ 986
Amounts included in the ALLL for the TDR portfolio	539		509
Commercial [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	1,264		1,769
Recorded Investment	872	[1]	1,178	[1]
Associated Allowance	274	[2]	410	[2]
Average Recorded Investment	1,027	[1]	1,533	[1]
Commercial [Member] | Impaired loans without an associated allowance [Member]
Unpaid Principal Balance	368		87
Recorded Investment	128	[1]	75	[1]
Average Recorded Investment	99	[1]	90	[1]
Commercial Real Estate [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	1,504		1,927
Recorded Investment	1,032	[1]	1,446	[1]
Associated Allowance	337	[2]	449	[2]
Average Recorded Investment	1,298	[1]	1,732	[1]
Commercial Real Estate [Member] | Impaired loans without an associated allowance [Member]
Unpaid Principal Balance	674		525
Recorded Investment	440	[1]	389	[1]
Average Recorded Investment	431	[1]	320	[1]
Home Equity [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	755		622
Recorded Investment	741	[1]	622	[1]
Associated Allowance	266	[2]	207	[2]
Average Recorded Investment	687	[1]	448	[1]
Credit Card [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	272		301
Recorded Investment	272	[1]	301	[1]
Associated Allowance	68	[2]	149	[2]
Average Recorded Investment	287	[1]	275	[1]
Other Consumer [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	44		34
Recorded Investment	44	[1]	34	[1]
Associated Allowance	5	[2]	7	[2]
Average Recorded Investment	37	[1]	30	[1]
Residential Real Estate [Member] | Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	823		521
Recorded Investment	694	[1]	465	[1]
Associated Allowance	172	[2]	122	[2]
Average Recorded Investment	578	[1]	309	[1]
Impaired loans with an associated allowance [Member]
Unpaid Principal Balance	4,662		5,174
Recorded Investment	3,655	[1]	4,046	[1]
Associated Allowance	1,122	[2]	1,344	[2]
Average Recorded Investment	3,914	[1]	4,327	[1]
Impaired loans without an associated allowance [Member]
Unpaid Principal Balance	1,042		612
Recorded Investment	568	[1]	464	[1]
Average Recorded Investment	530	[1]	410	[1]
Total impaired loans [Member]
Unpaid Principal Balance	5,704		5,786
Recorded Investment	4,223	[1]	4,510	[1]
Associated Allowance	1,122	[2]	1,344	[2]
Average Recorded Investment	$ 4,444	[1]	$ 4,737	[1]

[1] Recorded investment in a loan includes the unpaid principal balance plus accrued interest and net accounting adjustments, less any charge-offs. Recorded investment does notinclude any associated valuation allowance. Average recorded investment is for the nine months ended September 30, 2011, and year ended December 31, 2010.

[2] Associated allowance amounts include $539 million and $509 million for TDRs at September 30, 2011, and December 31, 2010, respectively.