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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ (109) | $ 17
(Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | (44) |
Estimated future employer contributions in next fiscal year | $ 19 |

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