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Pension, Post-Retirement and Post-Employment Plans - Domestic Defined Benefit Post-Retirement Medical and Dental Plan (Details) - Post-retirement Medical Benefits - Domestic
12 Months Ended
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]  
Post-retirement medical benefits limits 5.00%
Benefit obligation percent to retirees 37.00%
Benefit obligation percent to eligible active participants 35.00%
Benefit obligation percent to other active participants 28.00%
Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Age of retiree 55 years
Years of service 20 years
Post-retirement medical benefits limits 4.00%
Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Years of service 10 years
Post-retirement medical benefits limits 2.00%