Certain Transfers of Financial Assets and Variable Interest Entities Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (parenthetical) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 2,000,000	$ 8,000,000	$ 14,000,000		$ 26,000,000
LHFS excluded from managed loans disclosure	1,700,000,000		1,700,000,000			1,700,000,000
Loans Held For Sale [Member]
Servicing Assets at Fair Value [Line Items]
LHFS Accruing90OrMoreDaysPastDueAndNonaccruingExcludedFromManagedLoanDisclosure	53,000,000		53,000,000			17,000,000
Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 2,000,000	$ 8,000,000	$ 13,000,000	[1],[2]	$ 24,000,000

[1] The transfer activity is related to unconsolidated VIEs.

[2] Does not include GSE mortgage loan transfers