Benefit Plans Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning		$ 144		$ 123
Service cost		8		6		$ 7
Interest cost		2		3		3
Changes in actuarial assumptions and other		1		19
Settlements and curtailments		0		(1)
Benefits paid		(2)		(2)
Adjustments for foreign currency translation		12		(3)
Other––net		(1)		(1)
Benefit obligation, ending		164		144		123
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning		72	[1]	65
Actual return on plan assets		4		7
Company contributions		5		5
Settlements and curtailments		0		(1)
Benefits paid		(2)		(2)
Adjustments for foreign currency translation		6		(2)
Fair value of plan assets, ending		85	[1]	72	[1]	$ 65
Funded status—Projected benefit obligation in excess of plan assets at end of year	[2]	$ (79)		$ (72)

[1] Fair values are determined based on valuation inputs categorized as Level 1, 2 or 3 (see Note 3. Significant Accounting Policies—Fair Value). Investment plan assets are valued using Level 1 or Level 2 inputs.

[2] Included in Other noncurrent liabilities.