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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 1,795 | $ 2,019 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 132 | 158 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 382 | 253 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 194 | 230 |
Principal Plans | Held directly |  |  |
Fair value of plan assets | 25 | 34 |
Principal Plans | Held directly | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 16 | 23 |
Principal Plans | Held directly | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 9 | 11 |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 112 | 98 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 289 | 85 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 94 | 97 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 18 | 1 |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 304 | 203 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 408 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 304 | 203 |
Principal Plans | U.S. securitized [Member] |  |  |
Fair value of plan assets | 1 |  |
Principal Plans | U.S. securitized [Member] | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 1 |  |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 50 | 38 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 509 | 591 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 50 | 38 |
Principal Plans | U.S. equity |  |  |
Fair value of plan assets |  | 21 |
Principal Plans | U.S. equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 21 |
Principal Plans | International equity |  |  |
Fair value of plan assets | 11 | 15 |
Principal Plans | International equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 15 |
Principal Plans | Non-U.S. equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 3 |
Principal Plans | Global equity |  |  |
Fair value of plan assets | 218 |  |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 224 |
Principal Plans | Insurance Contracts |  |  |
Fair value of plan assets | 194 | 230 |
Principal Plans | Insurance Contracts | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 194 | 230 |
Principal Plans | Other |  |  |
Fair value of plan assets | (3) | 2 |
Principal Plans | Other | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | (3) | 2 |
Principal Plans | International equity |  |  |
Fair value of plan assets | 2 |  |
Principal Plans | International equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 11 |  |
Principal Plans | U.S. equity |  |  |
Fair value of plan assets | 14 |  |
Principal Plans | U.S. equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 14 |  |
Principal Plans | Non-U.S. securitized | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 69 | 67 |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 2,093 | $ 2,329 | $ 2,321

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