Pension and Other Postretirement Employee Benefit Plans - Weighted-average Assumptions Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined benefit pension plans, U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.30%	4.50%
Rate of compensation increase	2.30%	3.50%
Non-U.S. defined benefit pension plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.60%	0.80%
Rate of compensation increase	2.25%	2.25%
Non-U.S. defined benefit pension plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.60%	3.70%
Rate of compensation increase	3.00%	4.30%
OBEP plans, U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	4.40%
Assumed for next year	5.00%	5.50%
Ultimate	5.00%	5.00%	5.00%
Year when rate will reach ultimate	2017	2017	2017