Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Beginning balance	$ (86)
Other comprehensive income (loss) before reclassification	68
Amounts reclassified from AOCI	5
Total other comprehensive income (loss)	73	(47)
Ending balance	(13)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	(96)
Other comprehensive income (loss) before reclassification	70
Amounts reclassified from AOCI	1
Total other comprehensive income (loss)	71
Ending balance	(25)
Foreign currency translation, net [Member]
Beginning balance	10
Other comprehensive income (loss) before reclassification	(2)
Amounts reclassified from AOCI	4
Total other comprehensive income (loss)	2
Ending balance	$ 12