Pensions Benefit Plans and Other Postretirement Benefits - Weighted Average Assumptions Assumed and Effect of Percentage Point Change in Health Care Cost Trend (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Payments to the trust as required by the bargaining agreements are based upon specified amounts per hour worked	$ 5	$ 6	$ 6
U.S.
Weighted average assumed health care cost trend (in percent)
Health care cost trend rate assumed for next year (as a percent)	5.80%	6.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) (as a percent)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2025	2025
Effect of one-percentage-point change in assumed health care cost trend rates (in percent)
One-Percentage-Point Increase, effect on accumulated postretirement benefit obligations	$ 3
One-Percentage-Point Decrease, effect on accumulated postretirement benefit obligations	$ (2)
Non-U.S.
Weighted average assumed health care cost trend (in percent)
Health care cost trend rate assumed for next year (as a percent)	5.00%	5.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) (as a percent)	5.00%	5.00%
Effect of one-percentage-point change in assumed health care cost trend rates (in percent)
One-Percentage-Point Increase, effect on total of service and interest cost	$ 1
One-Percentage-Point Decrease, effect on total of service and interest cost	(1)
One-Percentage-Point Increase, effect on accumulated postretirement benefit obligations	11
One-Percentage-Point Decrease, effect on accumulated postretirement benefit obligations	$ (9)

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Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of contributions made to multiemployer plan by employer.

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