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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 3,627 | $ 3,303 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 277 | 258 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 372 | 244 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 380 | 372 |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 56 | 44 |
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 15 | 31 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 56 | 44 |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 191 | 161 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 167 | 153 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 171 | 147 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 20 | 14 |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 310 | 221 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 730 | 662 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 310 | 221 |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 42 | 9 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 1,062 | 937 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 42 | 9 |
Principal Plans | U.S. Equity |  |  |
Fair value of plan assets | 18 | 39 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 18 | 39 |
Principal Plans | International Equity |  |  |
Fair value of plan assets | 31 | 32 |
Principal Plans | International Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 31 | 32 |
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 107 | 86 |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 517 | 572 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 380 | 372 |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 380 | 372 |
Principal Plans | Other |  |  |
Fair value of plan assets | 1 | (16) |
Principal Plans | Other | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 1 | (4) |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 4,193 | $ 3,803 | $ 3,398

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