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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | $ 27,748 | $ 28,256 | $ 31,488
Mark-to-market for economic hedging activities | 206 | (2,863) | 1,248
Contract amortization | (332) | (168) | (86)
Revenues | 28,130 | 28,823 | 31,543
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 117 | 52 | 35
Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 36 | 74 |
Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 12,946 | 12,171 | 10,761
Retail revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 14,203 | 15,296 | 18,961
Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 27,149 | 27,467 | 29,722
Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 500 | 553 | 1,250
Derivative revenue | 130 | 176 | (8)
Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 177 | 197 | 272
Derivative revenue | 76 | 73 | 33
Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | (3) | 144 | (83)
Less: Realized and unrealized ASC 815 revenue | 265 | 515 | 20
Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 336 | 494 | 421
Contract amortization | (29) | (32) | (39)
Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 28,130 | 28,823 | 31,543
Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 26 | 48 | (32)
Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (39) | (14) | (15)
Revenues | (48) | (30) | 17
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | (1) | 0 | 1
Corporate/Eliminations | Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 | 110
Corporate/Eliminations | Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (25) | (1) | (1)
Corporate/Eliminations | Retail revenue | Business |  |  |
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 | (25) | (1) | (1)
Corporate/Eliminations | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (12) | 0 | 32
Derivative revenue | (12) | 1 | 31
Corporate/Eliminations | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (3) | (2) | 0
Derivative revenue | 0 | 0 | 0
Corporate/Eliminations | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 4 | (16) | 1
Less: Realized and unrealized ASC 815 revenue | (8) | (16) | 31
Corporate/Eliminations | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (12) | (11) | (15)
Contract amortization | 0 | 0 | 0
Corporate/Eliminations | Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (48) | (30) | 17
Corporate/Eliminations | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | (1) | (1)
Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 10,623 | 10,447 | 10,059
Revenues | 10,653 | 10,476 | 10,057
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 | 0 | 0
Texas | Operating Segments | Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 | 0
Texas | Operating Segments | Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 6,836 | 6,538 | 6,388
Texas | Operating Segments | Retail revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 3,564 | 3,492 | 3,229
Texas | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 10,400 | 10,030 | 9,617
Texas | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 41 | 77 | 111
Derivative revenue | 0 | 0 | 0
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 | 0 | 0 | 2
Less: Realized and unrealized ASC 815 revenue | 30 | 29 | (2)
Texas | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 212 | 369 | 327
Contract amortization | 0 | 0 | 0
Texas | Operating Segments | Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 10,653 | 10,476 | 10,057
Texas | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 30 | 29 | (4)
Texas | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (22) | (5) | (4)
East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 11,482 | 12,166 | 16,686
Revenues | 11,707 | 12,547 | 16,763
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 57 | 17 | (7)
East | Operating Segments | Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 36 | 74 | 110
East | Operating Segments | Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 2,453 | 2,195 | 2,088
East | Operating Segments | Retail revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 8,794 | 9,751 | 13,768
East | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 11,247 | 11,946 | 15,856
East | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 242 | 291 | 641
Derivative revenue | 79 | 162 | (31)
East | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 156 | 197 | 232
Derivative revenue | 76 | 73 | 33
East | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | (23) | 57 | (30)
Less: Realized and unrealized ASC 815 revenue | 168 | 364 | 84
East | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 112 | 88 | 104
Contract amortization | (27) | (32) | (40)
East | Operating Segments | Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 11,707 | 12,547 | 16,763
East | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | (2) | 2
East | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | (9) | 26
West/Services/Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 3,750 | 4,108 | 4,758
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 61 | 35 | 41
West/Services/Other | Operating Segments | Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 | 0
West/Services/Other | Operating Segments | Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,750 | 1,890 | 2,286
West/Services/Other | Operating Segments | Retail revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,845 | 2,053 | 1,964
West/Services/Other | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 3,595 | 3,943 | 4,250
West/Services/Other | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 229 | 185 | 466
Derivative revenue | 63 | 13 | (8)
West/Services/Other | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 24 | 2 | 40
Derivative revenue | 0 | 0 | 0
West/Services/Other | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 16 | 103 | (56)
Less: Realized and unrealized ASC 815 revenue | 75 | 138 | (93)
West/Services/Other | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 24 | 48 | 5
Contract amortization | (2) | 0 | 1
West/Services/Other | Operating Segments | Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,886 | 4,281 | 4,706
West/Services/Other | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | (4) | 22 | (29)
Vivint Smart Home | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,932 | 1,549 |
Revenues | 1,932 | 1,549 |
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 | 0 |
Vivint Smart Home | Operating Segments | Retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 | $ 0
Vivint Smart Home | Operating Segments | Retail revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,932 | 1,549 |
Vivint Smart Home | Operating Segments | Retail revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 |
Vivint Smart Home | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,932 | 1,549 |
Vivint Smart Home | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 |
Derivative revenue | 0 | 0 |
Vivint Smart Home | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 |
Derivative revenue | 0 | 0 |
Vivint Smart Home | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 0 | 0 |
Less: Realized and unrealized ASC 815 revenue | 0 | 0 |
Vivint Smart Home | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 0 |
Contract amortization | 0 | 0 |
Vivint Smart Home | Operating Segments | Total operating revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,932 | 1,549 |
Vivint Smart Home | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 |
Vivint Smart Home | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ (8) | $ 0 |

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