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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 88
2021 92
2022 94
2023 98
2024 100
2025 — 2029 540
United States | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 747
2021 717
2022 710
2023 718
2024 708
2025 — 2029 3,943
International | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 242
2021 225
2022 243
2023 250
2024 250
2025 — 2029 $ 1,417