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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Document Period End Date | Dec. 31, 2020 |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 1,910 | $ 1,857 |
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | (6) | 2 | $ 3
Deferred Revenue, Revenue Recognized | 28 | 22 |
Regulated Operating Revenue | 1,932 | 1,881 |
Unregulated Operating Revenue | 162 | 170 |
Regulated and Unregulated Operating Revenue | 51 | 72 |
Total Revenues | 2,145 | 2,123 | 1,991
Gain on Derivative Instruments, Pretax | 65 | 50 |
Asset Retirement Obligation, Cash Paid to Settle | 18 | 9 | $ 5
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 1,030 | 981 |
Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 616 | 636 |
Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 218 | 196 |
Direct Access customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 46 | 44 |
Revenue Subject to Refund [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 24 | $ 23 |

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