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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net gains (losses) on financial instruments at fair value and foreign exchange $ 57 $ 5 $ 63 $ 62
Income (loss) before income taxes 148 171 607 122
Provision (benefit) for income taxes (25) 39 58 4
Net income (loss) 173 132 549 118
Amounts reclassified from AOCI [Member]
        
Net income (loss) 0 (8) (18) 7
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
        
Net gains (losses) on financial instruments at fair value and foreign exchange 0 (11) (20) 15
Net investment income 0 (1) (2) (4)
Income (loss) before income taxes 0 (12) (22) 11
Provision (benefit) for income taxes 0 (4) (8) 4
Net income (loss) 0 (8) (14) 7
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member]
        
Net gains (losses) on financial instruments at fair value and foreign exchange $ 0 $ 0 $ (4) $ 0