Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (348)	$ (165)	$ (4)
Other comprehensive income (loss) before reclassifications	(18)	(189)	(198)
Amounts reclassified from accumulated other comprehensive income (loss)	(4)	3	(74)
Income tax (provision) benefit	12	3	111
Balance as of the end of the period	(358)	(348)	(165)
Unrealized Gain (Loss) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	1	1	0
Other comprehensive income (loss) before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	0	0	1
Balance as of the end of the period	1	1	1
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(339)	(151)	(3)
Other comprehensive income (loss) before reclassifications	(22)	(193)	(188)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	11	5	40
Balance as of the end of the period	(350)	(339)	(151)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(2)	(4)	(44)
Other comprehensive income (loss) before reclassifications	7	(2)	(9)
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	5	9
Income tax (provision) benefit	0	(1)	40
Balance as of the end of the period	3	(2)	(4)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(8)	(11)	43
Other comprehensive income (loss) before reclassifications	(3)	6	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(2)	(83)
Income tax (provision) benefit	1	(1)	30
Balance as of the end of the period	$ (12)	$ (8)	$ (11)