Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Maturities and Realized Gains (Details)

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Investment Securities - Maturities and Realized Gains (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Expected and Contractual Maturities [Abstract]      
Due in one year or less, amortized cost $ 411    
Due in one year or less, fair value 411    
Due after one year through five years, amortized cost 99    
Due after one year through five years, fair value 99    
Due after five years through ten years, amortized cost 105    
Due after five years through ten years, fair value 105    
Available-for-sale 615 [1]   656
Available-for-sale, fair value 615 [1]   656
Proceeds and Gross Unrealized Gains (Losses) on Available For Sale Securities [Abstract]      
Proceeds 0 3  
Gross realized gains 0 0  
Gross realized losses $ 0 $ 0  
[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.