Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (55)	$ 63
Income (loss) before income taxes	404	215
Provision (benefit) for income taxes	148	51
Net income (loss)	256	164
Amounts reclassified from AOCI [Member]
Net income (loss)	(5)	16
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	(1)	26
Net investment income	(1)	(1)
Income (loss) before income taxes	(2)	25
Provision (benefit) for income taxes	(1)	9
Net income (loss)	(1)	16
Foreign currency translation, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (4)	$ 0