Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Beginning balance	$ 21
Other comprehensive income (loss) before reclassification	(3)
Amounts reclassified from AOCI	4
Total other comprehensive income (loss)	1	73
Ending balance	22
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	34
Other comprehensive income (loss) before reclassification	17
Amounts reclassified from AOCI	4
Total other comprehensive income (loss)	21
Ending balance	55
Foreign currency translation, net [Member]
Beginning balance	(13)
Other comprehensive income (loss) before reclassification	(20)
Amounts reclassified from AOCI	0
Total other comprehensive income (loss)	(20)
Ending balance	$ (33)