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Pension, Post-Retirement and Post-Employment Plans - Key Assumptions Used to Determine Benefit Obligations (Details)
Dec. 31, 2019
Dec. 31, 2018
Pension Plan and SERP | Domestic    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Discount rate (percent) 3.30% 4.30%
Rate of compensation increase (percent) 3.50% 3.50%
Pension Plan and SERP | Foreign    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Discount rate (percent) 1.00% 1.50%
Rate of compensation increase (percent) 3.10% 3.40%
Post-retirement Medical Benefits | Domestic    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Discount rate (percent) 3.20% 4.30%
Post-retirement Medical Benefits | Foreign    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Discount rate (percent) 7.30% 9.20%