Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss (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) [Roll Forward]
Beginning balance	$ 4,352	$ 2,987	$ 3,773	$ 2,708
Other comprehensive income, net of tax	(44)	121	63	(9)
Ending balance	4,681	3,607	4,681	3,607
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(623)	(856)	(730)	(726)
Other comprehensive income, net of tax	(44)	121	63	(9)
Ending balance	(667)	(735)	(667)	(735)
Derivatives Net Unrealized Gains/ (Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(15)	0
Other comprehensive income, net of tax			21	(27)
Ending balance	6	(27)	6	(27)
Net Investment Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(37)	21
Other comprehensive income, net of tax			33	(27)
Ending balance	(4)	(6)	(4)	(6)
Currency Translation Adjustment Net Unrealized Gain/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(655)	(724)
Other comprehensive income, net of tax			9	46
Ending balance	(646)	(678)	(646)	(678)
Benefit Plans Actuarial Gains/(Losses)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(23)	(23)
Other comprehensive income, net of tax			0	(1)
Ending balance	$ (23)	$ (24)	$ (23)	$ (24)