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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Income taxes effect on net unrealized (losses) gains on securities available for sale $ (74) $ (25) $ (87) $ (31)
Income taxes effect on net unrealized (losses) gains on derivative financial instruments $ (18) $ (2) $ (23) $ 5