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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2018 USD ($)
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Qualified Defined Benefit Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Contributions expected to made by employer in 2018 | $ 5,000
Expected Future Benefit Payment [Abstract] |
Payments in 2019 | 2,350
Payments in 2020 | 2,390
Payments in 2021 | 2,470
Payments in 2022 | 2,550
Payments in 2023 | 2,610
Payments in 2024 - 2028 | 13,670
Retiree Medical and Life Insurance Plans |
Expected Future Benefit Payment [Abstract] |
Payments in 2019 | 170
Payments in 2020 | 180
Payments in 2021 | 180
Payments in 2022 | 180
Payments in 2023 | 170
Payments in 2024 - 2028 | $ 810

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