Accumulated Other Comprehensive Income (Changes In The Components Of 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
Beginning balance			$ (86)
Other comprehensive income (loss) before reclassification			124
Amounts reclassified from AOCI			18
Total other comprehensive income (loss)	69	(95)	142	(142)
Ending balance	56		56
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			(96)
Other comprehensive income (loss) before reclassification			120
Amounts reclassified from AOCI			14
Total other comprehensive income (loss)			134
Ending balance	38		38
Foreign currency translation, net [Member]
Beginning balance			10
Other comprehensive income (loss) before reclassification			4
Amounts reclassified from AOCI			4
Total other comprehensive income (loss)			8
Ending balance	$ 18		$ 18