Pension, Other Postretirement Benefits and Savings Plans - Pension Plan Weighted Average Investment Allocation (Details)	Dec. 31, 2017	Dec. 31, 2016
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	100.00%	100.00%
United States | Cash and Short Term Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	2.00%	3.00%
United States | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	6.00%	6.00%
United States | Debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	92.00%	91.00%
United States | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	0.00%	0.00%
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	100.00%	100.00%
Non-U.S. | Cash and Short Term Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	1.00%	1.00%
Non-U.S. | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	9.00%	9.00%
Non-U.S. | Debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	85.00%	78.00%
Non-U.S. | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	5.00%	12.00%