Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (300)	$ (247)	$ (177)
Other comprehensive income (loss) before reclassifications	(34)	(52)	(75)
Amounts reclassified from accumulated other comprehensive income (loss)	2	(2)	(1)
Income tax (provision) benefit	4	1	6
Balance as of the end of the period	(328)	(300)	(247)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(252)	(236)	(176)
Other comprehensive income (loss) before reclassifications	(4)	(10)	(65)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	(4)	(6)	5
Balance as of the end of the period	(260)	(252)	(236)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(38)	(8)	2
Other comprehensive income (loss) before reclassifications	(28)	(36)	(11)
Amounts reclassified from accumulated other comprehensive income (loss)	2	(2)	(1)
Income tax (provision) benefit	8	8	2
Balance as of the end of the period	(56)	(38)	(8)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(10)	(3)	(3)
Other comprehensive income (loss) before reclassifications	(2)	(6)	1
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	0	(1)	(1)
Balance as of the end of the period	$ (12)	$ (10)	$ (3)