Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 30	$ (55)
Income (loss) before income taxes	113	404
Provision (benefit) for income taxes	44	148
Net income (loss)	69	256
Amounts reclassified from AOCI [Member]
Net income (loss)	(4)	(5)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	(4)	(1)
Net investment income	(3)	(1)
Income (loss) before income taxes	(7)	(2)
Provision (benefit) for income taxes	(3)	(1)
Net income (loss)	(4)	(1)
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 0	$ (4)