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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Document Period End Date | Dec. 31, 2019 |  |
Regulated Operating Revenue, Electric, Non-Nuclear | $ 1,857 | $ 1,823 |
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | 2 | 3 | $ 0
Deferred Revenue, Revenue Recognized | (22) | (45) |
Regulated Operating Revenue | 1,881 | 1,781 |
Unregulated Operating Revenue | 170 | 159 |
Regulated and Unregulated Operating Revenue | 72 | 51 |
Total Revenues | 2,123 | 1,991 | $ 2,009
Gain on Derivative Instruments, Pretax | 50 | 42 |
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 981 | 948 |
Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 636 | 647 |
Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 196 | 185 |
Direct Access customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 44 | 43 |
Revenue Subject to Refund [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 23 | $ 45 |

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