Pension and Other Postretirement Employee Benefit Plans - Actual Rate of Return on Plan Assets (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined benefit pension plans, U.S.
Actual rate of return:
Actual rate of return	6.12%	0.88%	7.29%
Non-U.S. defined benefit pension plans | Minimum
Actual rate of return:
Actual rate of return	1.07%	(0.48%)	5.62%
Non-U.S. defined benefit pension plans | Maximum
Actual rate of return:
Actual rate of return	20.60%	4.92%	17.69%
OBEP plans, U.S.
Actual rate of return:
Actual rate of return	7.29%	1.16%	9.84%