Pensions Benefit Plans and Other Postretirement Benefits - Weighted Average Assumptions Assumed and Effect of Percentage Point Change in Health Care Cost Trend (Details) - Funded Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S.
Weighted average assumed health care cost trend (in percent)
Health care cost trend rate assumed for next year (as a percent)	6.60%	5.80%
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	2029	2028
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%
Other Post-retirement Benefits | U.S.
Defined Benefit Plan Disclosure
Payments to the trust as required by the bargaining agreements are based upon specified amounts per hour worked	$ 5	$ 5	$ 6