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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Qualified Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Company contributions | $ 1,000 | $ 5,000
Expected Future Benefit Payment [Abstract] |  |
2020 | 2,300 |
2021 | 2,360 |
2022 | 2,450 |
2023 | 2,530 |
2024 | 2,600 |
2025 – 2029 | 13,540 |
Retiree Medical and Life Insurance Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Company contributions | 59 | $ 1
Expected Future Benefit Payment [Abstract] |  |
2020 | 160 |
2021 | 160 |
2022 | 160 |
2023 | 160 |
2024 | 150 |
2025 – 2029 | $ 700 |

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