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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Income taxes effect on net unrealized (losses) gains on securities available for sale $ (48) $ (17) $ (135) $ (48)
Income taxes effect on net unrealized (losses) gains on derivative financial instruments $ 6 $ 12 $ (17) $ 17