Asset Quality (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Troubled debt restructurings (TDRs)	$ 2,575,000,000		$ 2,203,000,000
Specific reserves in ALLL for the TDR portfolio	570,000,000		580,000,000
Nonperforming loans	3,414,000,000		3,560,000,000
Exclusions from TDRs	2,300,000,000	1,900,000,000
Additional consumer lending TDRs added due to bankruptcy	154,800,000
Equipment Lease Financing [Member]
Nonperforming loans	15,000,000		22,000,000
Nonperforming [Member]
Troubled debt restructurings (TDRs)	1,383,000,000		1,141,000,000
Accruing [Member]
Troubled debt restructurings (TDRs)	$ 950,000,000		$ 771,000,000