Pension and Postretirement Benefit Plans - Significant Weighted Average Assumptions Used in Measurement of OPEB Obligations (Details) - Other Postretirement Benefits Plan [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
UNITED STATES
OPEB benefit obligations:
Discount rate	3.37%
Net periodic benefit cost:
Discount rate	4.08%
Foreign Plan [Member]
OPEB benefit obligations:
Discount rate	3.10%	3.71%	3.41%
Net periodic benefit cost:
Discount rate	3.76%	3.42%	3.70%
Initial health care cost trend rate	4.22%	4.12%	5.07%
Ultimate health care cost trend rate	4.93%	5.10%	5.07%