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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net gains (losses) on financial instruments at fair value and foreign exchange $ 14 $ 45 $ (55) $ 75
Income (loss) before income taxes (55) 92 (156) 205
Provision (benefit) for income taxes (28) 28 (51) 72
Net income (loss) (27) 64 (105) 133
Amounts reclassified from AOCI [Member]        
Net income (loss) (8) 2 (5) (2)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]        
Net gains (losses) on financial instruments at fair value and foreign exchange (12) 3 (4) (1)
Net investment income (1)   (4) (3)
Income (loss) before income taxes (13) 3 (8) (4)
Provision (benefit) for income taxes (5) 1 (3) (2)
Net income (loss) $ (8) $ 2 $ (5) $ (2)