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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | $ 8,690 | $ 7,991 | $ 8,148
Mark-to-market for economic hedging activities | (119) | (20) | 14
Revenues | 9,093 | 9,821 | 9,478
Less: Lease revenue | 18 | 20 | 21
Derivative revenue | (124) | 0 | 31
Retail Revenue | Mass customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 6,331 | 6,254 | 5,591
Retail Revenue | Business Solutions customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,129 | 1,279 | 1,303
Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 7,460 | 7,533 | 6,894
Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 539 | 1,169 | 1,496
Derivative revenue | 105 | 1,595 | 1,233
Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 680 | 700 | 825
Derivative revenue | 156 | 109 | 137
Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 95 | 33 | (130)
Derivative revenue | 385 | 1,810 | 1,309
Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 319 | 386 | 393
Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9,093 | 9,821 | 9,478
Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 29 | 73 | 69
Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (7) | (5) | (19)
Revenues | (4) | (7) | (18)
Less: Lease revenue | 0 | 0 | 0
Corporate/Eliminations | Retail Revenue | Mass customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (2) | (3) | (1)
Corporate/Eliminations | Retail Revenue | Business Solutions customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 | 0
Corporate/Eliminations | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (2) | (3) | (1)
Corporate/Eliminations | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (1) | 0 | 13
Derivative revenue | (5) | (1) | 14
Corporate/Eliminations | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (1) | 0 | 0
Derivative revenue | 0 | 0 | 0
Corporate/Eliminations | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 8 | (1) | (13)
Derivative revenue | 3 | (2) | 1
Corporate/Eliminations | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (8) | (3) | (17)
Corporate/Eliminations | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (4) | (7) | (18)
Corporate/Eliminations | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 | 1
Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 6,279 | 5,507 | 5,304
Revenues | 6,309 | 7,069 | 6,401
Less: Lease revenue | 0 | 0 | 1
Texas | Operating Segments | Retail Revenue | Mass customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 5,027 | 5,027 | 4,618
Texas | Operating Segments | Retail Revenue | Business Solutions customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,034 | 1,205 | 1,238
Texas | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 6,061 | 6,232 | 5,856
Texas | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 24 | 529 | 371
Derivative revenue | 0 | 1,459 | 1,131
Texas | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0
Texas | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 2 | 47 | (77)
Derivative revenue | 30 | 1,562 | 1,096
Texas | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 222 | 261 | 251
Texas | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6,309 | 7,069 | 6,401
Texas | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 28 | 56 | 42
Texas | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (6) | (1) | (19)
East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 2,039 | 2,135 | 2,160
Revenues | 2,354 | 2,319 | 2,371
Less: Lease revenue | 1 | 1 | 1
East | Operating Segments | Retail Revenue | Mass customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,306 | 1,230 | 974
East | Operating Segments | Retail Revenue | Business Solutions customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 95 | 74 | 65
East | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,401 | 1,304 | 1,039
East | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 183 | 322 | 546
Derivative revenue | 67 | 98 | 90
East | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 620 | 664 | 746
Derivative revenue | 156 | 109 | 137
East | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 88 | (29) | (35)
Derivative revenue | 314 | 183 | 210
East | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 62 | 58 | 75
East | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,354 | 2,319 | 2,371
East | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 3 | 5 | 17
East | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6 | (8) | 5
West/Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 379 | 354 | 703
Revenues | 434 | 440 | 724
Less: Lease revenue | 17 | 19 | 19
West/Other | Operating Segments | Retail Revenue | Mass customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 | 0
West/Other | Operating Segments | Retail Revenue | Business Solutions customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 | 0
West/Other | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 | 0
West/Other | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 333 | 318 | 566
Derivative revenue | 43 | 39 | (2)
West/Other | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 61 | 36 | 79
Derivative revenue | 0 | 0 | 0
West/Other | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | (3) | 16 | (5)
Derivative revenue | 38 | 67 | 2
West/Other | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 43 | 70 | 84
West/Other | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 434 | 440 | 724
West/Other | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | (2) | 12 | 9
West/Other | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ (4) | $ 2 | $ (4)

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