Pension and Postretirement Benefit Plans - Significant Weighted Average Assumptions Used in Measurement of OPEB Obligations (Details) - Foreign Postretirement Benefit Plan [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPEB benefit obligations:
Discount rate	3.69%	3.96%	3.84%
Net periodic benefit cost:
Discount rate	3.45%	3.84%	4.65%
Initial health care cost trend rate	5.32%	5.62%	5.91%
Ultimate health care cost trend rate	5.02%	5.03%	5.02%
Year ultimate reached	2018	2018	2018