Employee Benefits Plans (Details 11)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	4.20%	4.50%	4.15%
Foreign Plan
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	3.90%	3.70%	3.70%
Other Postretirement Benefits Plan [Member] | United States
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	4.20%	4.50%	4.15%
Other Postretirement Benefits Plan [Member] | Foreign Plan
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	4.00%	4.00%	4.00%