Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Pension Plan
Anticipated cash contributions
Anticipated cash contributions in current year	$ 4
Pension Plan \| US
Components of Net Periodic Benefit Costs
Service cost	1	$ 1
Interest cost	4	3
Expected return on plan assets	(5)	(5)
Net periodic benefit cost		(1)
Anticipated cash contributions
Anticipated cash contributions in current year	1
Pension Plan \| US \| Maximum
Employer contributions
Cash contributions made in period	1
Pension Plan \| Non-US
Components of Net Periodic Benefit Costs
Service cost	1	1
Interest cost	3	3
Expected return on plan assets	(2)	(2)
Net periodic benefit cost	2	2
Anticipated cash contributions
Anticipated cash contributions in current year	3
Employer contributions
Cash contributions made in period	1
Postemployment Retirement Benefits
Components of Net Periodic Benefit Costs
Interest cost	1	1
Amortization of prior service credit	$ (1)	$ (1)

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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