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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Fair value of plan assets | $ 3,897 | $ 3,534 | $ 3,508
Principal Plans |  |  |
Fair value of plan assets | 3,312 | 3,011 |
Principal Plans | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 638 | 240 |
Principal Plans | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 334 |  |
Principal Plans | Cash and Cash Equivalents |  |  |
Fair value of plan assets | 28 | 33 |
Principal Plans | Cash and Cash Equivalents | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 24 | 17 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 28 | 33 |
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 0 |  |
Principal Plans | U.S. government and municipals |  |  |
Fair value of plan assets | 522 | 122 |
Principal Plans | U.S. government and municipals | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 150 | 128 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 522 | 122 |
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 0 |  |
Principal Plans | U.S. corporate debt | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 686 | 648 |
Principal Plans | International Bonds | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 665 | 1,223 |
Principal Plans | U.S. Equity |  |  |
Fair value of plan assets | 41 | 41 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 41 | 41 |
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 0 |  |
Principal Plans | International Equity |  |  |
Fair value of plan assets | 47 | 44 |
Principal Plans | International Equity | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 47 | 44 |
Principal Plans | International Equity | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | 0 |  |
Principal Plans | Non-U.S. Equity | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 85 | 68 |
Principal Plans | Global equity | Mutual and Pooled Funds | Net Asset Value or Its Equivalent |  |  |
Fair value of plan assets | 730 | $ 687 |
Principal Plans | Insurance Contract |  |  |
Fair value of plan assets | 334 |  |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 1 |  |  |
Fair value of plan assets | 0 |  |
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3 |  |  |
Fair value of plan assets | $ 334 |  |

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