Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 9	$ (24)
Net loss	(51)	(9)
Currency translation adjustments (net of tax of $(24) and $0, respectively)	72	(92)
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 and $0, respectively)	0	0
Net unrealized gain (loss) on cash flow hedges (net of tax of $2 and $0, respectively)	(3)	(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1	1
Other comprehensive income (loss)	70	(94)
Total comprehensive income (loss)	19	(103)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	2	2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$ 0	$ 0