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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Fair Value Measurements [Abstract]    
Long-term Debt $ 605,000,000 $ 609,000,000
Fair value of total debt 602,000,000 $ 613,000,000
Transfers between levels during period $ 0