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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 7,929 | $ 1,925
Mark-to-market for economic hedging activities | 721 | 44
Operating revenues | 8,091 | 2,019
Lease revenue | 2 | 5
Derivative revenue | 725 | 55
Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (3) | (2)
Operating revenues | (1) | (3)
Lease revenue | 0 | 0
Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,162 | 1,661
Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | (1)
Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 482 | 124
Derivative revenue | 58 | 53
Energy revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1 | (1)
Derivative revenue | 2 | (1)
Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 155 | 149
Derivative revenue | 37 | 24
Capacity revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (32) | (4)
Derivative revenue | 160 | 89
Derivative revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 1 | 1
Derivative revenue | 2 | (1)
Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,324 | 89
Other revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (3) | (2)
Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 8,091 | 2,019
Total operating revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | (1) | (3)
Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 97 | 16
Other revenue, derivative | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (1) | (1)
Home | Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,718 | 1,378
Home | Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | (1)
Business | Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,444 | 283
Business | Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Texas | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,609 | 1,351
Operating revenues | 3,702 | 1,358
Lease revenue | 0 | 0
Texas | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,114 | 1,292
Texas | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 285 | 5
Derivative revenue | 0 | 0
Texas | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Texas | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (1) | 0
Derivative revenue | 93 | 7
Texas | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,304 | 61
Texas | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 3,702 | 1,358
Texas | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 94 | 7
Texas | Other Ancillary | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,200 |
Texas | Home | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,542 | 1,032
Texas | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 572 | 260
East | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,726 | 482
Operating revenues | 3,825 | 521
Lease revenue | 0 | 0
East | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,543 | 352
East | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 126 | 45
Derivative revenue | 60 | 35
East | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 141 | 134
Derivative revenue | 37 | 24
East | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (4) | (20)
Derivative revenue | 99 | 39
East | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 19 | 10
East | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 3,825 | 521
East | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 6 | 0
East | Home | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 702 | 329
East | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,841 | 23
West/Services/Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 597 | 94
Operating revenues | 565 | 143
Lease revenue | 2 | 5
West/Services/Other | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 505 | 18
West/Services/Other | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 70 | 75
Derivative revenue | (4) | 19
West/Services/Other | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 14 | 15
Derivative revenue | 0 | 0
West/Services/Other | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (28) | 15
Derivative revenue | (34) | 44
West/Services/Other | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4 | 20
West/Services/Other | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 565 | 143
West/Services/Other | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (2) | 10
West/Services/Other | Home | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 474 | 18
West/Services/Other | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 31 | $ 0

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