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Postretirement Benefit Plans - Additional Information (Detail) - USD ($) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | $ 24,092,000,000 | $ 24,515,000,000 |
Contributions made to defined contribution plans | $ 1,200,000,000 | $ 1,200,000,000 |
Shares of our stock held in defined contribution plans we sponsor (in shares) | 24.9 | 26.6 |
Nonqualified Defined Benefit Pension Plans and Other Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross benefit obligation | $ 905,000,000 | $ 1,000,000,000 |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 658,000,000 | 615,000,000 |
Net actuarial (losses) gains | (303,000,000) | (347,000,000) |
Benefit plan expense | 62,000,000 | 64,000,000 | $ 81,000,000
Qualified Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash contributions | 990,000,000 |  |
Expected required contributions to our qualified defined benefit pension plans in next fiscal year | 0 |  |
Gross benefit obligation | 27,199,000,000 | 28,959,000,000 | 28,698,000,000
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | 22,414,000,000 | 22,800,000,000 | $ 23,228,000,000
Net actuarial (losses) gains | 10,469,000,000 | 10,999,000,000 |
Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets set aside expected to be used to pay obligations of defined benefit pension plans and retiree medical and life insurance plans | $ 1,028,000,000 | $ 847,000,000 |
Minimum | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 1 month |  |
Commingled equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 90 days |  |
Private equity funds | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 8 years |  |
Private equity funds | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 12 years |  |
Real estate funds | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 8 years |  |
Real estate funds | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period | 10 years |  |

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