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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ 30 | $ 52
Estimated future employer contributions in next fiscal year | 30 |
(Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ 24 |

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