Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 3	$ 1	$ 7	$ (16)
Net income	209	184	194	318
Currency translation adjustments (net of tax of $(24) and $0, respectively)	20	(34)	100	(118)
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 and $0, respectively)	1	(1)	1	(2)
Net unrealized gain (loss) on cash flow hedges (net of tax of $2 and $0, respectively)	4	(1)	(4)	(4)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1	2	3	4
Other comprehensive income (loss)	26	(34)	100	(120)
Total comprehensive income (loss)	235	150	294	198
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	0	1	0	1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(3)	1	2	3
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$ 0	$ 0	$ (1)	$ (1)