Loan Sale and Servicing Activities and Variable Interest Entities (Consolidated VIEs) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Aggregate Assets	$ 113,736	$ 121,049
Aggregate Liabilities	109,265	117,190
Tax Credit Investments and Other [Member]
Aggregate Assets	6,564	5,960
Aggregate Liabilities	2,093	2,101
Variable Interest Entity, Primary Beneficiary [Member] | Market Street [Member]
Aggregate Assets	7,322	7,796
Aggregate Liabilities	7,322	7,796
Variable Interest Entity, Primary Beneficiary [Member] | Credit Card and Other Securitization Trusts [Member]
Aggregate Assets	1,978	1,782
Aggregate Liabilities	195
Variable Interest Entity, Primary Beneficiary [Member] | Tax Credit Investments and Other [Member]
Aggregate Assets	1,045	2,162
Aggregate Liabilities	$ 544	$ 853