Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			$ (300)
Other comprehensive income (loss) before reclassifications			(50)
Income tax (provision) benefit	$ 4	$ 7	4	$ 1
As of June 30, 2020	(346)		(346)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019			(252)
Other comprehensive income (loss) before reclassifications			0
Income tax (provision) benefit			(8)
As of June 30, 2020	(260)		(260)
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			(50)
Income tax (provision) benefit			12
As of June 30, 2020	(76)		(76)
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
Income tax (provision) benefit			0
As of June 30, 2020	$ (10)		$ (10)