Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 45	$ 61	$ 75	$ 6
Income (loss) before income taxes	92	55	205	459
Provision (benefit) for income taxes	28	(65)	72	83
Net income (loss)	64	120	133	376
Amounts reclassified from AOCI [Member]
Net income (loss)	2	(13)	(2)	(18)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	3	(19)	(1)	(20)
Net investment income	0	(1)	(3)	(2)
Income (loss) before income taxes	3	(20)	(4)	(22)
Provision (benefit) for income taxes	1	(7)	(2)	(8)
Net income (loss)	2	(13)	(2)	(14)
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 0	$ 0	$ 0	$ (4)