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Investment Securities (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Gross realized gains and losses on the sales of investment securities      
Gains $ 127 $ 16 $ 1
Losses (1) 0 (6)
Total $ 126 $ 16 $ (5)