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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2024 USD ($)
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Qualified Defined Benefit Pension Plans |
Expected Future Benefit Payment [Abstract] |
2025 | $ 1,800
2026 | 1,860
2027 | 1,910
2028 | 1,960
2029 | 1,990
2030 – 2034 | 9,990
Retiree Medical and Life Insurance Plans |
Expected Future Benefit Payment [Abstract] |
2025 | 110
2026 | 110
2027 | 110
2028 | 100
2029 | 100
2030 – 2034 | $ 440

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