Asset Quality (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Troubled debt restructurings (TDRs)	$ 2,667,000,000		$ 2,739,000,000
Specific ALLL reserve for TDRs	436,000,000	507,000,000	470,000,000
Nonperforming loans	2,801,000,000		3,088,000,000
Exclusions from TDRs	600,000,000	1,700,000,000
Equipment Lease Financing [Member]
Nonperforming loans	4,000,000		5,000,000
Equipment Lease Financing [Member] | Excluded from impaired loans due to authoritative lease accounting guidance [Member]
Nonperforming loans	4,000,000		5,000,000
Nonperforming [Member]
Troubled debt restructurings (TDRs)	1,369,000,000		1,511,000,000
Accruing [Member]
Troubled debt restructurings (TDRs)	1,153,000,000		1,062,000,000
Performing TDRs, including credit card loans
Troubled debt restructurings (TDRs)	$ 1,300,000,000		$ 1,200,000,000