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Pension and Postretirement Benefit Plans - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan [Member] | UNITED STATES  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 1,001
2020 43
2021 42
2022 42
2023 41
2024 to 2028 191
Total 1,360
Pension Plan [Member] | Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 25
2020 15
2021 15
2022 17
2023 17
2024 to 2028 103
Total 192
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 5
2020 5
2021 5
2022 5
2023 5
2024 to 2028 24
Total $ 49