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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 2,018 | $ 3,389 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 219 | 265 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 226 | 337 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 222 | 355 |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 69 | 50 |
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 76 | 26 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 69 | 50 |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 115 | 166 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 71 | 149 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 115 | 158 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets |  | 8 |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 193 | 293 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 419 | 646 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 7 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 193 | 286 |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 33 | 43 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 549 | 1,144 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 33 | 43 |
Principal Plans | U.S. Equity |  |  |
Fair value of plan assets |  | 17 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 17 |
Principal Plans | International Equity |  |  |
Fair value of plan assets |  | 32 |
Principal Plans | International Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets |  | 32 |
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 46 |
Principal Plans | Global equity |  |  |
Fair value of plan assets | 221 |  |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 423 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 222 | 355 |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 222 | 355 |
Principal Plans | Other |  |  |
Fair value of plan assets | (1) | (1) |
Principal Plans | Other | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | (1) | 1 |
Principal Plans | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Fair value of plan assets | 15 |  |
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 |  |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 2,321 | $ 3,744 | $ 4,193

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