Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 61	$ (6)	$ 6	$ 57
Income (loss) before income taxes	55	(264)	459	(49)
Provision (benefit) for income taxes	(65)	(86)	83	(35)
Net income (loss)	120	(178)	376	(14)
Amounts reclassified from AOCI [Member]
Net income (loss)	(13)	(1)	(18)	15
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	(19)	0	(20)	26
Net investment income	(1)	(2)	(2)	(3)
Income (loss) before income taxes	(20)	(2)	(22)	23
Provision (benefit) for income taxes	(7)	(1)	(8)	8
Net income (loss)	(13)	(1)	(14)	15
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