Pension and Other Postretirement Employee Benefit Plans - Actual Rate of Return on Plan Assets (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. defined benefit pension plans
Actual rate of return:
Actual rate of return	7.29%	15.95%	12.66%
Non-U.S. defined benefit pension plans | Minimum
Actual rate of return:
Actual rate of return	5.62%	3.74%	7.21%
Non-U.S. defined benefit pension plans | Maximum
Actual rate of return:
Actual rate of return	17.69%	23.80%	11.72%
U.S. OPEB plans
Actual rate of return:
Actual rate of return	9.84%	13.88%	10.10%