Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			$ (300)
Other comprehensive income (loss) before reclassifications			(56)
Amounts reclassified from accumulated other comprehensive income (loss)			2
Income tax (provision) benefit	$ 6	$ (2)	10	$ (1)
As of September 30, 2020	(344)		(344)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			(252)
Other comprehensive income (loss) before reclassifications			(10)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Income tax (provision) benefit			(1)
As of September 30, 2020	(263)		(263)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			(38)
Other comprehensive income (loss) before reclassifications			(46)
Amounts reclassified from accumulated other comprehensive income (loss)			2
Income tax (provision) benefit			11
As of September 30, 2020	(71)		(71)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			(10)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			0
Income tax (provision) benefit			0
As of September 30, 2020	$ (10)		$ (10)