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Long-Term Debt And Lease Obligation (Long-term Debt and Lease Obligation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Long-Term Debt and Lease Obligation [Abstract]      
Finance Lease, Right-of-Use Asset, Amortization $ 16 $ 14 $ 14
Operating Lease, Expense 3 3 5
Total Finance and Operating Lease Cost 19 17 19
Finance Lease, Principal Payments $ 17 $ 16 $ 15
Finance Lease, Weighted Average Discount Rate, Percent 4.88% 4.35% 3.20%
Finance Lease, Weighted Average Remaining Lease Term 3 years 11 months 15 days 3 years 10 months 20 days 3 years 5 months 26 days
Operating Lease, Payments $ 3 $ 3 $ 4
Operating Lease, Weighted Average Discount Rate, Percent 4.44% 4.66% 3.44%
Operating Lease, Weighted Average Remaining Lease Term 3 years 5 months 19 days 4 years 3 months 18 days 4 years 6 months 10 days