Pension, Other Postretirement Benefits and Savings Plans - Pension Plan Weighted Average Investment Allocation (Details)	Dec. 31, 2020	Dec. 31, 2019
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%
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%
Cash and short term securities | United States
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	3.00%	2.00%
Cash and short term securities | Non-U.S.
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	2.00%	1.00%
Equity securities | United States
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	4.00%	6.00%
Equity securities | Non-U.S.
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	4.00%	3.00%
Debt securities | United States
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	93.00%	92.00%
Debt securities | Non-U.S.
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	93.00%	96.00%
Alternatives | Non-U.S.
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan weighted average investment allocation	1.00%