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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Subtotal | $ 448 | $ 459 | $ 1,370 | $ 1,353
Alternative revenue programs, net of amortization | 4 | 0 | 5 | (2)
Other accrued (deferred) revenues, net | 4 | (11) | 17 | (38)
Total retail revenues | 456 | 448 | 1,392 | 1,313
Wholesale revenues | 72 | 67 | 125 | 119
Other operating revenue | 14 | 10 | 58 | 35
Total Revenues | 542 | 525 | 1,575 | 1,467
Gain on Derivative Instruments, Pretax | 25 | 29 | 38 | 35
Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Subtotal | 218 | 224 | 713 | 699
Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Subtotal | 167 | 171 | 479 | 484
Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Subtotal | 50 | 55 | 144 | 138
Direct Access customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Subtotal | 13 | 9 | 34 | 32
Revenue Subject to Refund [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net tax benefits due to the change in tax rate under the TCJA | $ 6 | $ 11 | $ 17 | $ 36

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