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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, 2017
USD ($)
Postretirement medical plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 53
2019 55
2020 58
2021 60
2022 61
2023-2027 333
US Plan Assets  
Defined Benefit Plan Disclosure [Line Items]  
2018 201
2019 207
2020 212
2021 218
2022 224
2023-2027 1,215
International  
Defined Benefit Plan Disclosure [Line Items]  
2018 281
2019 294
2020 307
2021 320
2022 333
2023-2027 $ 1,895