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Investment Securities (Schedule of Investment Securities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Total investment securities $ 4,943 $ 6,232
US Treasury Securities [Member]
   
Investment Holdings [Line Items]    
Total investment securities 2,068 2,460
US Government Corporations and Agencies Securities [Member]
   
Investment Holdings [Line Items]    
Total investment securities 1,570 2,233
US States and Political Subdivisions Debt Securities [Member]
   
Investment Holdings [Line Items]    
Total investment securities 24 34
Total Other Securities [Member]
   
Investment Holdings [Line Items]    
Total investment securities 1,281 1,505
Asset-backed Securities, Securitized Loans and Receivables [Member]
   
Investment Holdings [Line Items]    
Total investment securities 41 151
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Investment Holdings [Line Items]    
Total investment securities $ 1,240 [1] $ 1,354 [1]
[1] Consists of residential mortgage-backed securities issued by Fannie Mae, Freddie Mac and Ginnie Mae.