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Fair Value Measurements (Fair Value of Life Policy) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of life policy loans | $ 39 | $ 37
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of life policy loans | 0 | 0
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of life policy loans | 0 | 0
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of life policy loans | $ 39 | $ 37

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