Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2019	$ (300)
Other comprehensive income (loss) before reclassifications	(41)
Income tax (provision) benefit	0	$ (6)
As of March 31, 2020	(341)
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
Income tax (provision) benefit	(12)
As of March 31, 2020	(254)
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	(51)
Income tax (provision) benefit	12
As of March 31, 2020	(77)
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 March 31, 2020	$ (10)