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Pension and Other Benefit Plans - Expected Benefits to be Paid Under US and International Pension Plans and Postretirement Medical Plan (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Postretirement medical plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 52
2021 54
2022 55
2023 56
2024 57
2025-2029 317
US  
Defined Benefit Plan Disclosure [Line Items]  
2020 218
2021 221
2022 225
2023 229
2024 233
2025-2029 1,213
International  
Defined Benefit Plan Disclosure [Line Items]  
2020 333
2021 343
2022 353
2023 365
2024 366
2025-2029 $ 2,057