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Stockholders' Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassifications out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and sundry (income) expense | $ (29) | $ 24 | $ (222) | $ 106
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement benefits, pre-tax |  |  |  |
Reclassifications out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and sundry (income) expense | $ 21 |  | $ 43 |

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