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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 2,019 | $ 2,018 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 158 | 219 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 253 | 226 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 230 | 222 |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 34 | 69 |
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 76 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 23 | 69 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 11 |  |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 98 | 115 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 85 | 71 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 97 | 115 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 1 |  |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 203 | 193 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 408 | 419 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 0 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 203 | 193 |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 38 | 33 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 591 | 549 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 38 | 33 |
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 | 15 | 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 |  | 15 |
Principal Plans | Global equity |  |  |
Fair value of plan assets | 224 |  |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 221 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 230 | 222 |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 230 | 222 |
Principal Plans | Other |  |  |
Fair value of plan assets | 2 | (1) |
Principal Plans | Other | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 2 | (1) |
Principal Plans | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Fair value of plan assets | 3 |  |
Principal Plans | Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 15 |  |
Principal Plans | Defined Benefit Plan, Equity Securities, US |  |  |
Fair value of plan assets | 21 |  |
Principal Plans | Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 21 |  |
Principal Plans | Non-U.S securitized |  |  |
Fair value of plan assets | 67 |  |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 2,329 | $ 2,321 | $ 3,744

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