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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Document Period End Date | Dec. 31, 2023 |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 2,439 | $ 2,205 | $ 2,105
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | 11 | 11 | (29)
Deferred Revenue, Revenue Recognized | (3) | (7) | (2)
Regulated Operating Revenue | 2,447 | 2,223 | 2,078
Unregulated Operating Revenue | 418 | 363 | 255
Regulated and Unregulated Operating Revenue | 58 | 61 | 63
Total Revenues | 2,923 | 2,647 | 2,396
Gain on Derivative Instruments, Pretax | 185 | 133 | 63
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 1,263 | 1,158 | 1,118
Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 800 | 723 | 690
Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 349 | 289 | 250
Direct Access customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 27 | $ 35 | $ 47

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