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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net gains (losses) on financial instruments at fair value and foreign exchange $ 17 $ (69)
Income (loss) before income taxes (120) (101)
Provision (benefit) for income taxes (48) (23)
Net income (loss) (72) (78)
Amounts reclassified from AOCI [Member]    
Net income (loss) 0 3
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]    
Net gains (losses) on financial instruments at fair value and foreign exchange 2 8
Other-than-temporary impairments recognized in accumulated other comprehensive income (loss) (2) 0
Net investment income 0 (3)
Income (loss) before income taxes 0 5
Provision (benefit) for income taxes 0 2
Net income (loss) $ 0 $ 3