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Stock Based Compensation - Stock Compensation Expense and Tax Impacts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]      
Compensation Cost included in O&M Expense $ 40 $ 18 $ 29
Income Tax Benefit Recognized in Consolidated Statements of Operations $ 11 $ 5 $ 8