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Fair Value Measurements (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Fair Value Measurements [Abstract]    
Long-term Debt $ 601,000,000 $ 609,000,000
Fair value of total debt 598,000,000 $ 613,000,000
Transfers between levels during period $ 0