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Benefit Plans - Weighted-Average Assumptions to Determine Net Periodic Postretirement Health Care Cost (Details) - Postretirement Health Care Plan
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.66% 4.14% 4.60%
Health care cost trend rate 6.25% 6.50% 6.50%
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.24% 4.55% 4.77%
Health care cost trend rate 5.56% 5.50% 5.50%