Share-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 11			$ 4			$ 36	$ 14
Revisions to estimates	(10)	$ (8)	$ (9)	(5)	$ (4)	$ (2)
Europe | Cost Reduction Programs | Performance Solutions
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Revisions to estimates				3				3
Cash-Settled Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	2			0			18	1
Share-settled
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 9			$ 4			$ 18	$ 13