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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 1,925 | $ 1,779
Mark-to-market for economic hedging activities | 44 | 20
Operating revenues | 2,019 | 2,165
Lease revenue | 5 | 5
Derivative revenue | 55 | 27
Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 124 | 290
Derivative revenue | 53 | 320
Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 149 | 156
Derivative revenue | 24 | 18
Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,378 | 1,313
Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 283 | 276
Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,661 | 1,589
Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (4) | 20
Derivative revenue | 89 | 381
Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 89 | 110
Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 2,019 | 2,165
Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 16 | 23
Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (2) | (3)
Operating revenues | (3) | (2)
Lease revenue | 0 | 0
Corporate/Eliminations | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | 1
Derivative revenue | (1) | 0
Corporate/Eliminations | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Corporate/Eliminations | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | (2)
Corporate/Eliminations | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate/Eliminations | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | (2)
Corporate/Eliminations | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 1 | 0
Derivative revenue | (1) | 0
Corporate/Eliminations | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (2) | (2)
Corporate/Eliminations | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | (3) | (3)
Corporate/Eliminations | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (1) | 0
Texas | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,351 | 1,151
Operating revenues | 1,358 | 1,466
Lease revenue | 0 | 0
Texas | Operating Segments | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 5 | 105
Derivative revenue | 0 | 271
Texas | Operating Segments | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Texas | Operating Segments | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,032 | 995
Texas | Operating Segments | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 260 | 258
Texas | Operating Segments | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,292 | 1,253
Texas | Operating Segments | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 0 | 31
Derivative revenue | 7 | 315
Texas | Operating Segments | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 61 | 77
Texas | Operating Segments | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 1,358 | 1,466
Texas | Operating Segments | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 7 | 13
East | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 500 | 555
Operating revenues | 539 | 609
Lease revenue | 0 | 0
East | Operating Segments | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 45 | 126
Derivative revenue | 35 | 47
East | Operating Segments | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 134 | 144
Derivative revenue | 24 | 18
East | Operating Segments | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 347 | 320
East | Operating Segments | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 23 | 18
East | Operating Segments | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 370 | 338
East | Operating Segments | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (20) | (15)
Derivative revenue | 39 | 54
East | Operating Segments | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10 | 16
East | Operating Segments | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 539 | 609
East | Operating Segments | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 0 | 4
West/Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 76 | 76
Operating revenues | 125 | 93
Lease revenue | 5 | 5
West/Other | Operating Segments | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 75 | 58
Derivative revenue | 19 | 2
West/Other | Operating Segments | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 15 | 12
Derivative revenue | 0 | 0
West/Other | Operating Segments | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
West/Other | Operating Segments | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
West/Other | Operating Segments | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
West/Other | Operating Segments | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 15 | 4
Derivative revenue | 44 | 12
West/Other | Operating Segments | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 20 | 19
West/Other | Operating Segments | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 125 | 93
West/Other | Operating Segments | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | $ 10 | $ 6

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