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Fair Value Measurements - U.S. Pension Benefit Plans (Details) - Pension Benefit Plans - UNITED STATES - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | $ 3,249 | $ 3,273 | $ 3,076
Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 3,249 | 3,273 |
Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 3,071 | 3,232 |
Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 23 | 27 |
Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,443 | 1,709 |
Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 239 | 192 |
Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 905 | 894 |
Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 258 | 253 |
Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 203 | 157 |
Recurring | Accrued income receivable |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 162 | 23 |
Recurring | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 16 | 18 |
Recurring | Level 1 | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,320 | 1,510 |
Recurring | Level 1 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 23 | 27 |
Recurring | Level 1 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,039 | 1,230 |
Recurring | Level 1 | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 1 | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 1 | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 258 | 253 |
Recurring | Level 1 | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 2 | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,548 | 1,565 |
Recurring | Level 2 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 2 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 404 | 479 |
Recurring | Level 2 | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 239 | 192 |
Recurring | Level 2 | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 905 | 894 |
Recurring | Level 2 | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 2 | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 203 | 157 |
Recurring | Level 3 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Recurring | Level 3 | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | $ 203 | $ 157 |

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