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Employee Benefits - Fair Values for Pension Plans by Asset Category (Detail) - Pension - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | $ 6,802 | $ 13,536 | $ 13,739
Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 4,146 | 9,104 |
Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 542 | 1,956 |
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 12 | 69 |
Fair Value, Inputs, Level 1, 2 and 3 | U.S. Treasuries and agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 720 | 1,412 |
Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 1,129 | 2,994 |
Fair Value, Inputs, Level 1, 2 and 3 | International bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 113 | 341 |
Fair Value, Inputs, Level 1, 2 and 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 82 | 768 |
Fair Value, Inputs, Level 1, 2 and 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 934 | 996 |
Fair Value, Inputs, Level 1, 2 and 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 564 | 512 |
Fair Value, Inputs, Level 1, 2 and 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 50 | 56 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 1,609 | 3,541 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 530 | 1,771 |
Level 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 12 | 55 |
Level 1 | U.S. Treasuries and agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 527 | 1,274 |
Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 627 | 204 |
Level 1 | International bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 3 |
Level 1 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | (87) | 234 |
Level 1 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 1 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 1 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 1,016 | 4,029 |
Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 12 | 185 |
Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 14 |
Level 2 | U.S. Treasuries and agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 193 | 138 |
Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 502 | 2,790 |
Level 2 | International bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 113 | 338 |
Level 2 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 169 | 534 |
Level 2 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 2 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 2 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 27 | 30 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 1,521 | 1,534 | 1,623
Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | U.S. Treasuries and agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | International bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 0 | 0 |
Level 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 934 | 996 | 1,002
Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 564 | 512 | 569
Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | 23 | 26 | $ 52
Investments measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets amount | $ 2,656 | $ 4,432 |

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