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 $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Servicing Assets at Fair Value [Line Items]
Loans Receivable Held-for-sale, Net	$ 3,399	[1]	$ 2,353
Loans Held-for-Sale
Servicing Assets at Fair Value [Line Items]
LHFS Accruing90OrMoreDaysPastDueAndNonaccruing	$ 38		$ 3

[1] 1 Includes loans held for sale, at fair value, of consolidated VIEs319 315