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Retirement Programs - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Pension contributions | $ 76 | $ 69
Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Required contributions to pension plans for 2020 | 85 |
Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Required contributions to pension plans for 2020 | $ 95 |

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