Variable Interest Entities - Third-party Sponsored VIEs (Details 2c) (USD $)	3 Months Ended							3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Variable Interest Entity, Not Primary Beneficiary [Member]	Mar. 31, 2012 Third-Party Credit Card Securitization Trusts [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Third-Party Credit Card Securitization Trusts [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Third-Party Credit Card Securitization Trusts [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Available-for-sale Securities [Member]	Mar. 31, 2012 Third-Party Credit Card Securitization Trusts [Member]
Variable Interest Entity [Line Items]
Fair value of non-consolidated assets held by VIEs			$ 3,300,000,000	$ 4,300,000,000			$ 2,900,000,000
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card					1,500,000,000	1,000,000,000
Available-for-sale Securities, Gross Realized Gains	$ 749,000,000	$ 152,000,000						$ 85,000,000