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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 2,684 | $ 2,504 | $ 6,733 | $ 6,066
Mark-to-market for economic hedging activities | (118) | (64) | 13 | (23)
Operating revenues | 2,809 | 2,996 | 7,066 | 7,626
Lease revenue | 5 | 5 | 15 | 15
Derivative revenue | (123) | (68) | 18 | (8)
Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (3) | 0 | (6) | (5)
Operating revenues | 2 | (2) | (1) | (7)
Lease revenue | 0 | 0 | 0 | 0
Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,302 | 2,488 | 5,795 | 5,762
Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | (1) | (3)
Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 222 | 426 | 429 | 952
Derivative revenue | 35 | 652 | 99 | 1,352
Energy revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1 | (1) | (1) | 0
Derivative revenue | (1) | (2) | (3) | (2)
Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 174 | 194 | 518 | 551
Derivative revenue | 49 | 34 | 114 | 82
Capacity revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 1
Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 39 | (210) | 78 | 51
Derivative revenue | 120 | 487 | 318 | 1,545
Derivative revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 5 | 0 | 8 | (1)
Derivative revenue | 5 | (2) | 5 | (2)
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 72 | 98 | 246 | 310
Other revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (4) | (1) | (7) | (3)
Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 2,809 | 2,996 | 7,066 | 7,626
Total operating revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 2 | (2) | (1) | (7)
Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (3) | 11 | 27 | 60
Other revenue, derivative | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 1 | 0 | 0 | 0
Mass customers | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,987 | 2,072 | 4,929 | 4,780
Mass customers | Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | (1) | (3)
Business Solutions customers | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 315 | 416 | 866 | 982
Business Solutions customers | Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Texas | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,982 | 1,788 | 4,904 | 4,197
Operating revenues | 1,992 | 2,208 | 4,928 | 5,511
Lease revenue | 0 | 0 | 0 | 0
Texas | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,921 | 2,132 | 4,734 | 4,818
Texas | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 11 | 211 | 21 | 452
Derivative revenue | 0 | 613 | 0 | 1,239
Texas | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 0
Texas | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 1 | (213) | 1 | 28
Derivative revenue | 10 | 420 | 24 | 1,314
Texas | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 59 | 78 | 172 | 213
Texas | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 1,992 | 2,208 | 4,928 | 5,511
Texas | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 9 | 20 | 23 | 47
Texas | Mass customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,633 | 1,735 | 3,938 | 3,891
Texas | Business Solutions customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 288 | 397 | 796 | 927
East | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 578 | 610 | 1,558 | 1,624
Operating revenues | 693 | 679 | 1,798 | 1,812
Lease revenue | 0 | 0 | 1 | 1
East | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 381 | 356 | 1,062 | 947
East | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 93 | 109 | 157 | 283
Derivative revenue | 23 | 20 | 60 | 87
East | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 158 | 185 | 471 | 524
Derivative revenue | 49 | 34 | 114 | 81
East | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 43 | 12 | 63 | 13
Derivative revenue | 115 | 69 | 239 | 187
East | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 18 | 17 | 45 | 45
East | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 693 | 679 | 1,798 | 1,812
East | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 | 3 | 2 | 6
East | Mass customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 354 | 337 | 992 | 892
East | Business Solutions customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 27 | 19 | 70 | 55
West/Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 127 | 106 | 277 | 250
Operating revenues | 122 | 111 | 341 | 310
Lease revenue | 5 | 5 | 14 | 14
West/Other | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
West/Other | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 117 | 107 | 252 | 217
Derivative revenue | 13 | 21 | 42 | 28
West/Other | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 16 | 9 | 47 | 27
Derivative revenue | 0 | 0 | 0 | 0
West/Other | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (10) | (9) | 6 | 11
Derivative revenue | (10) | 0 | 50 | 46
West/Other | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 4 | 36 | 55
West/Other | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 122 | 111 | 341 | 310
West/Other | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (13) | (12) | 2 | 7
West/Other | Mass customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
West/Other | Business Solutions customers | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0

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