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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Principal Plans |  |  |
Fair value of plan assets | $ 3,303 | $ 2,936 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 258 | 230 |
Principal Plans | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 244 | 225 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 372 | 347 |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 44 | 15 |
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 31 | 45 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 44 | 15 |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 161 | 161 |
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 586 | 479 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 147 | 145 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 14 | 16 |
Principal Plans | U.S. corporate debt |  |  |
Fair value of plan assets | 221 | 196 |
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 662 | 593 |
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 221 | 196 |
Principal Plans | International bonds |  |  |
Fair value of plan assets | 9 | 13 |
Principal Plans | International bonds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 504 | 494 |
Principal Plans | International bonds | Fair Value, Inputs, Level 2 |  |  |
Fair value of plan assets | 9 | 13 |
Principal Plans | U.S. Equity |  |  |
Fair value of plan assets | 39 | 30 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 39 | 30 |
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 | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 86 | 73 |
Principal Plans | Global equity | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 572 | 448 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 372 | 347 |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 372 | 347 |
Principal Plans | Other |  |  |
Fair value of plan assets | (16) | 11 |
Principal Plans | Other | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | (4) | 9 |
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 3,803 | $ 3,398 | $ 3,897

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