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Postretirement Benefit Plans (Summary of Status of Plans) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 391 | $ 574
Accumulated benefit obligation | 372 | 541
Fair value of plan assets | $ 121 | $ 164

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