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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 91
2020 95
2021 98
2022 102
2023 105
2024 — 2028 577
United States | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 638
2020 661
2021 680
2022 685
2023 709
2024 — 2028 3,805
International | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 225
2020 213
2021 221
2022 239
2023 249
2024 — 2028 $ 1,349