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Investment Securities (Gains And Losses On Available-For-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Investments, Debt and Equity Securities [Abstract]    
Securities gains $ 12 $ 21
Securities losses (1) [1] (3) [1]
Total net securities gains $ 11 $ 18
[1] Primarily charges related to a derivative contract tied to the conversion rate of Visa Class B shares.