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Stock Based Compensation (Accrual Adjustments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement [Abstract] |  |  |
Compensation Costs included in O&M Expense | $ 18 | $ 29 | $ 28
Income Tax Benefit Recognized in Consolidated Statement of Operations | $ 5 | $ 8 | $ 8

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