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, 2019		Dec. 31, 2018		Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning		$ 123		$ 129
Service cost		6		7		$ 7
Interest cost		3		3		3
Changes in actuarial assumptions and other		19		(4)
Settlements and curtailments		(1)		(6)
Benefits paid		(2)		0
Adjustments for foreign currency translation		(3)		(5)
Other––net		(1)		(1)
Benefit obligation, ending		144		123		129
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning		65	[1]	69
Actual return on plan assets		7		(1)
Company contributions		5		5
Settlements and curtailments		(1)		(5)
Adjustments for foreign currency translation		(2)		(2)
Other––net		0		(1)
Fair value of plan assets, ending		72	[1]	65	[1]	$ 69
Funded status—Projected benefit obligation in excess of plan assets at end of year	[2]	$ (72)		$ (58)

[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.