Postemployment Benefit Plans (Assumptions) (Details) - plan	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plans
Postemployment Benefit Plans
Number of funded benefit plans	3
Number of unfunded defined benefit plans	3
Weighted average assumptions used to determine benefit obligations
Discount rate (as a percent)	4.26%	4.55%
Compensation trend rate (as a percent)		3.82%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	4.56%	4.16%	5.04%
Expected rate of return (as a percent)	6.82%	7.79%	7.18%
Compensation trend rate (as a percent)	0.22%	0.21%	4.13%
Non-U.S. Plans
Postemployment Benefit Plans
Number of funded benefit plans	2
Number of unfunded defined benefit plans	2
Weighted average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.69%	3.59%
Compensation trend rate (as a percent)	2.25%	3.77%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	3.69%	3.26%	4.41%
Expected rate of return (as a percent)	5.85%	5.93%	6.07%
Compensation trend rate (as a percent)	4.01%	3.83%	4.25%
OPEB Plans
Weighted average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.08%	3.13%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	3.13%	3.86%	4.54%
Health care cost trend rate, initial (as a percent)		7.81%	7.81%
Health care cost trend rate, ultimate (as a percent)		5.00%	5.00%