Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Beginning balance			$ 21
Other comprehensive income (loss) before reclassification			(59)
Amounts reclassified from AOCI			2
Total other comprehensive income (loss)	$ (58)	$ 69	(57)	$ 142
Ending balance	(36)		(36)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			34
Other comprehensive income (loss) before reclassification			(59)
Amounts reclassified from AOCI			2
Total other comprehensive income (loss)			(57)
Ending balance	(23)		(23)
Foreign currency translation, net [Member]
Beginning balance			(13)
Other comprehensive income (loss) before reclassification			0
Amounts reclassified from AOCI			0
Total other comprehensive income (loss)			0
Ending balance	$ (13)		$ (13)