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Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | $ 2,149 | $ 1,536 | $ 1,614
Significant Unobservable Inputs (Level 3) | Buy-in annuity contracts and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,082 | 1,471 | 1,540
Significant Unobservable Inputs (Level 3) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 63 | 62 | 70
Significant Unobservable Inputs (Level 3) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 4 | 3 | $ 4
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 8,401 | 9,087 |
Pension Plans | Total Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 6,590 | 7,003 |
Pension Plans | Total Fair Value | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 834 | 938 |
Pension Plans | Total Fair Value | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1 | 3 |
Pension Plans | Total Fair Value | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 833 | 935 |
Pension Plans | Total Fair Value | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 5,444 | 5,690 |
Pension Plans | Total Fair Value | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,854 | 2,485 |
Pension Plans | Total Fair Value | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 945 | 839 |
Pension Plans | Total Fair Value | Corporate bonds and fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 563 | 902 |
Pension Plans | Total Fair Value | Buy-in annuity contracts and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,082 | 1,464 |
Pension Plans | Total Fair Value | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 222 | 249 |
Pension Plans | Total Fair Value | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3 | 4 |
Pension Plans | Total Fair Value | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 87 | 122 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,126 | 2,131 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 752 | 866 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1 | 3 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 751 | 863 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,138 | 980 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 70 | 59 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 825 | 718 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 243 | 203 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Buy-in annuity contracts and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 159 | 182 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 77 | 103 |
Pension Plans | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,315 | 3,336 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 82 | 72 |
Pension Plans | Significant Other Observable Inputs (Level 2) | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 82 | 72 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,224 | 3,246 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,784 | 2,426 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 120 | 121 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Corporate bonds and fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 320 | 699 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Buy-in annuity contracts and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 9 | 18 |
Pension Plans | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,149 | 1,536 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,082 | 1,464 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Corporate bonds and fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 0 | 0 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Buy-in annuity contracts and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,082 | 1,464 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 63 | 67 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3 | 4 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1 | 1 |
Pension Plans | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | $ 1,811 | $ 2,084 |

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