Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Document Fiscal Year Focus	2017
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 3	$ 9
Net loss	(107)	(51)
Currency translation adjustments (net of tax of $(24) and $0, respectively)	25	72
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)	1	(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	2	1
Other comprehensive income (loss)	28	70
Total comprehensive income (loss)	(79)	19
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0	2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$ (1)	$ 0