Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), net [Line Items]
As of December 31, 2020			$ (328)
Other comprehensive income (loss) before reclassifications			42
Amounts reclassified from accumulated other comprehensive income (loss)			(2)
Income tax (provision) benefit	$ (25)	$ 6	(40)	$ 10
As of September 30, 2021	(328)		(328)
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
Amounts reclassified from accumulated other comprehensive income (loss)			0
Income tax (provision) benefit			(15)
As of September 30, 2021	(272)		(272)
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			43
Amounts reclassified from accumulated other comprehensive income (loss)			(2)
Income tax (provision) benefit			(25)
As of September 30, 2021	(40)		(40)
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)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Income tax (provision) benefit			0
As of September 30, 2021	$ (16)		$ (16)