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 $)	Mar. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
LHFS excluded from managed loans disclosure	$ 1,500,000,000	$ 1,700,000,000
Loans Held For Sale [Member]
Servicing Assets at Fair Value [Line Items]
LHFS Accruing90OrMoreDaysPastDueAndNonaccruingExcludedFromManagedLoanDisclosure	$ 13,000,000	$ 17,000,000