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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,551 | $ 2,503
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,079 | 1,239
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,472 | 1,264
Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,054 | 1,192
Common stock | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,054 | 1,192
Common stock | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 362 | 371
International equity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 362 | 371
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 637 | 310
Debt securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Debt securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 637 | 310
Domestic equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 346 | 166
Domestic equity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Domestic equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 346 | 166
Government and agencies securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4 | 170
Government and agencies securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Government and agencies securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4 | 170
Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 93
Corporate bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Corporate bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 93
Mortgage and other asset-backed securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 32
Mortgage and other asset-backed securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Mortgage and other asset-backed securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 32
Commingled funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 123 | 122
Commingled funds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Commingled funds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 123 | 122
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 25 | 47
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 25 | 47
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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