Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (247)	$ (177)	$ (358)
Other comprehensive income (loss) before reclassifications	(52)	(75)	174
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(1)	(5)
Income tax (provision) benefit	1	6	12
Balance as of the end of the period	(300)	(247)	(177)
Unrealized Gain (Loss) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	0	0	1
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	0	0	0
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(236)	(176)	(350)
Other comprehensive income (loss) before reclassifications	(10)	(65)	162
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	(6)	5	12
Balance as of the end of the period	(252)	(236)	(176)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(8)	2	3
Other comprehensive income (loss) before reclassifications	(36)	(11)	4
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(1)	(4)
Income tax (provision) benefit	8	2	(1)
Balance as of the end of the period	(38)	(8)	2
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(3)	(3)	(12)
Other comprehensive income (loss) before reclassifications	(6)	1	8
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	(1)
Income tax (provision) benefit	(1)	(1)	2
Balance as of the end of the period	$ (10)	$ (3)	$ (3)