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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, 2020
age
Defined Benefit Plan Disclosure  
Post-retirement medical benefits limits (percent) 5.00%
Benefit obligation percent to retirees (percent) 38.00%
Benefit obligation percent to eligible active participants (percent) 33.00%
Benefit obligation percent to other active participants (percent) 29.00%
Maximum  
Defined Benefit Plan Disclosure  
Age of retiree (age) 55
Years of service 20 years
Post-retirement medical benefits limits (percent) 4.00%
Minimum  
Defined Benefit Plan Disclosure  
Years of service 10 years
Post-retirement medical benefits limits (percent) 2.00%