Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020	$ (328)
Other comprehensive income (loss) before reclassifications	43
Income tax (provision) benefit	(17)	$ 0
As of March 31, 2021	(302)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020	(260)
Other comprehensive income (loss) before reclassifications	3
Income tax (provision) benefit	(7)
As of March 31, 2021	(264)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020	(56)
Other comprehensive income (loss) before reclassifications	44
Income tax (provision) benefit	(10)
As of March 31, 2021	(22)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020	(12)
Other comprehensive income (loss) before reclassifications	(4)
Income tax (provision) benefit	0
As of March 31, 2021	$ (16)