Annual report pursuant to Section 13 and 15(d)

Investment Securities - Maturities and Realized Gains (Details)

v2.4.0.6
Investment Securities - Maturities and Realized Gains (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Expected and Contractual Maturities [Abstract]      
Due in one year or less, amortized cost $ 428    
Due in one year or less, fair value 428    
Due after one year through five years, amortized cost 120    
Due after one year through five years, fair value 120    
Due after five years through ten years, amortized cost 108    
Due after five years through ten years, fair value 108    
Available-for-sale 656 [1] 694  
Available-for-sale, fair value 656 [1] 694  
Proceeds and Gross Unrealized Gains (Losses) on Available For Sale Securities [Abstract]      
Proceeds 22 4,290 15,472
Gross realized gains 5 69 531
Gross realized losses $ 0 $ (76) $ (272)
[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.