Quarterly report pursuant to Section 13 or 15(d)

Investment Securities Investment Securities - Maturities and Realized Gains (Details)

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Investment Securities Investment Securities - Maturities and Realized Gains (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Expected and Contractual Maturities [Abstract]          
Due in one year or less, amortized cost $ 413   $ 413    
Due in one year or less, fair value 413   413    
Due after one year through five years, amortized cost 302   302    
Due after one year through five years, fair value 303   303    
Due after five years through ten years, amortized cost 106   106    
Due after five years through ten years, fair value 106   106    
Available-for-sale 821 [1]   821 [1]   694
Available-for-sale, fair value 822 [1]   822 [1]   694
Proceeds and Gross Unrealized Gains (Losses) on Available For Sale Securities [Abstract]          
Proceeds 19 423 22 3,876  
Gross realized gains 5 2 5 46  
Gross realized losses $ 0 $ 0 $ 0 $ (4)  
[1] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay their obligations with or without prepayment penalties.