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Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]    
Interest bearing deposits with banks $ 17,059 $ 13,279
Other assets 7,277 7,069
Long-term debt 22,039 21,745
Variable interest entities
   
Variable Interest Entity [Line Items]    
Interest bearing deposits with banks 210 216
Other assets 514 533
Total 724 749
Long-term debt 92 92
Other liabilities 125 152
Total $ 217 $ 244