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Fair Value Measurements - U.S. Pension Benefit Plans (Details) - Pension Benefit Plans - UNITED STATES - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | $ 3,273 | $ 3,076 | $ 4,157
Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 3,273 | 3,076 |
Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 3,232 | 3,014 |
Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 27 | 48 |
Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,709 | 1,647 |
Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 192 | 159 |
Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 894 | 863 |
Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 253 | 186 |
Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 157 | 111 |
Recurring | Accrued income receivable |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 23 | 45 |
Recurring | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 18 | 17 |
Recurring | Level 1 | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,510 | 1,393 |
Recurring | Level 1 | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 27 | 48 |
Recurring | Level 1 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 1,230 | 1,159 |
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 | 253 | 186 |
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 | 1,565 | 1,510 |
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 | 479 | 488 |
Recurring | Level 2 | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 192 | 159 |
Recurring | Level 2 | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 894 | 863 |
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 | 157 | 111 |
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 | $ 157 | $ 111 |

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