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Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | $ 1,536 | $ 1,614 | $ 2,466
Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,471 | 1,540 | 2,387
Significant Unobservable Inputs (Level 3) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 62 | 70 | 74
Significant Unobservable Inputs (Level 3) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3 | 4 | $ 5
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 9,087 | 8,538 |
Pension Plans | Total Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 7,003 | 6,646 |
Pension Plans | Total Fair Value | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 938 | 964 |
Pension Plans | Total Fair Value | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3 | 3 |
Pension Plans | Total Fair Value | Non-U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value |  | 1 |
Pension Plans | Total Fair Value | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 935 | 960 |
Pension Plans | Total Fair Value | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 5,690 | 5,351 |
Pension Plans | Total Fair Value | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,485 | 2,495 |
Pension Plans | Total Fair Value | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 839 | 560 |
Pension Plans | Total Fair Value | Corporate bonds and other fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,366 | 2,296 |
Pension Plans | Total Fair Value | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 249 | 221 |
Pension Plans | Total Fair Value | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 4 | 4 |
Pension Plans | Total Fair Value | Cash and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 122 | 106 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,131 | 1,807 |
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 | 866 | 910 |
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 | 3 | 3 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value |  | 1 |
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 | 863 | 906 |
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 | 980 | 645 |
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 | 59 | 48 |
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 | 718 | 453 |
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 203 | 144 |
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 | 182 | 152 |
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 | 103 | 100 |
Pension Plans | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3,336 | 3,225 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 72 | 54 |
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) | Non-U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value |  | 0 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 72 | 54 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Total fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 3,246 | 3,166 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 2,426 | 2,447 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 121 | 107 |
Pension Plans | Significant Other Observable Inputs (Level 2) | Corporate bonds and other fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 699 | 612 |
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 | 18 | 5 |
Pension Plans | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,536 | 1,614 |
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) | Non-U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value |  | 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 | 1,464 | 1,540 |
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 other fixed-income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 1,464 | 1,540 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 67 | 69 |
Pension Plans | Significant Unobservable Inputs (Level 3) | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | 4 | 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 | $ 2,084 | $ 1,892 |

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