Pension and Other Postretirement Employee Benefit Plans - Weighted-average Assumptions Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined benefit pension plans, U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	4.00%
Rate of compensation increase	3.50%	3.50%
Non-U.S. defined benefit pension plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.80%	1.00%
Rate of compensation increase	2.25%	2.75%
Non-U.S. defined benefit pension plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.70%	3.60%
Rate of compensation increase	4.30%	4.20%
OBEP plans, U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	4.10%
Assumed for next year	5.50%	6.00%
Ultimate	5.00%	5.00%	5.00%
Year when rate will reach ultimate	2017	2017	2017