Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020			$ (328)
Other comprehensive income (loss) before reclassifications			45
Income tax (provision) benefit	$ 2	$ 4	(15)	$ 4
As of June 30, 2021	(298)		(298)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020			(260)
Other comprehensive income (loss) before reclassifications			9
Income tax (provision) benefit			(6)
As of June 30, 2021	(257)		(257)
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			40
Income tax (provision) benefit			(9)
As of June 30, 2021	(25)		(25)
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 June 30, 2021	$ (16)		$ (16)