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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 3,389 | $ 3,627 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 265 | 277 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 337 | 372 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 355 | 380 |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 50 | 56 |
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 26 | 15 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 50 | 56 |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 166 | 191 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 149 | 167 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 158 | 171 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 8 | 20 |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 293 | 310 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 646 | 730 |
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 | 286 | 310 |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 43 | 42 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 1,144 | 1,062 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 43 | 42 |
Principal Plans | U.S. Equity |  |  |
Fair value of plan assets | 17 | 18 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 17 | 18 |
Principal Plans | International Equity |  |  |
Fair value of plan assets | 32 | 31 |
Principal Plans | International Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 32 | 31 |
Principal Plans | Non-U.S. Equity |  |  |
Fair value of plan assets | 46 |  |
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 107 |
Principal Plans | Global equity |  |  |
Fair value of plan assets | 423 |  |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets |  | 517 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 355 | 380 |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 355 | 380 |
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 |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 3,744 | $ 4,193 | $ 3,803

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