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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | $ 28,256 | $ 31,488 | $ 26,777
Mark-to-market for economic hedging activities | (2,863) | 1,248 | 2,716
Contract amortization | (168) | (86) | (95)
Revenues | 28,823 | 31,543 | 26,989
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 52 | 35 | (22)
Retail Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 74 | 110 |
Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 12,171 | 10,761 | 9,549
Retail Revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 15,296 | 18,961 | 14,012
Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 27,467 | 29,722 | 23,561
Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 553 | 1,250 | 1,215
Derivative revenue | 176 | (8) | 136
Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 197 | 272 | 775
Derivative revenue | 73 | 33 | 149
Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 144 | (83) | (164)
Less: Realized and unrealized ASC 815 revenue | 515 | 20 | 234
Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 494 | 421 | 1,632
Contract amortization | (32) | (39) | (30)
Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 28,823 | 31,543 | 26,989
Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 48 | (32) | 113
Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (14) | (15) | (6)
Revenues | (30) | 17 | 10
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 | 1 | 0
Corporate/Eliminations | Retail Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 |
Corporate/Eliminations | Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (1) | (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 | (1) | (1) | (1)
Corporate/Eliminations | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 | 32 | 7
Derivative revenue | 1 | 31 | 3
Corporate/Eliminations | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (2) | 0 | 0
Derivative revenue | 0 | 0 | 0
Corporate/Eliminations | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | (16) | 1 | 13
Less: Realized and unrealized ASC 815 revenue | (16) | 31 | 16
Corporate/Eliminations | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | (11) | (15) | (9)
Contract amortization | 0 | 0 | 0
Corporate/Eliminations | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (30) | 17 | 10
Corporate/Eliminations | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | (1) | (1) | 0
Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 10,447 | 10,059 | 10,165
Revenues | 10,476 | 10,057 | 10,295
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 |
Texas | Operating Segments | Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 6,538 | 6,388 | 5,659
Texas | Operating Segments | Retail Revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 3,492 | 3,229 | 2,745
Texas | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 10,030 | 9,617 | 8,404
Texas | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 77 | 111 | 329
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 | 2 | (3)
Less: Realized and unrealized ASC 815 revenue | 29 | (2) | 130
Texas | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 369 | 327 | 1,565
Contract amortization | 0 | 0 | 0
Texas | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 10,476 | 10,057 | 10,295
Texas | Operating Segments | Other ancillary revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer |  |  | 1,300
Texas | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 29 | (4) | 133
Texas | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (5) | (4) | (5)
East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 12,166 | 16,686 | 12,866
Revenues | 12,547 | 16,763 | 13,025
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 17 | (7) | (25)
East | Operating Segments | Retail Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 74 | 110 |
East | Operating Segments | Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 2,195 | 2,088 | 1,832
East | Operating Segments | Retail Revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 9,751 | 13,768 | 10,030
East | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 11,946 | 15,856 | 11,862
East | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 291 | 641 | 508
Derivative revenue | 162 | (31) | 131
East | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 197 | 232 | 718
Derivative revenue | 73 | 33 | 149
East | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 57 | (30) | (88)
Less: Realized and unrealized ASC 815 revenue | 364 | 84 | 184
East | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 88 | 104 | 51
Contract amortization | (32) | (40) | (26)
East | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12,547 | 16,763 | 13,025
East | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | (2) | 2 | (8)
East | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (9) | 26 | 18
West/Services/Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 4,108 | 4,758 | 3,752
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 35 | 41 | 3
West/Services/Other | Operating Segments | Retail Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 | 0 |
West/Services/Other | Operating Segments | Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,890 | 2,286 | 2,059
West/Services/Other | Operating Segments | Retail Revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 2,053 | 1,964 | 1,237
West/Services/Other | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 3,943 | 4,250 | 3,296
West/Services/Other | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 185 | 466 | 371
Derivative revenue | 13 | (8) | 2
West/Services/Other | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 2 | 40 | 57
Derivative revenue | 0 | 0 | 0
West/Services/Other | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 103 | (56) | (86)
Less: Realized and unrealized ASC 815 revenue | 138 | (93) | (96)
West/Services/Other | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 48 | 5 | 25
Contract amortization | 0 | 1 | (4)
West/Services/Other | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,281 | 4,706 | 3,659
West/Services/Other | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 22 | $ (29) | $ (12)
Vivint Smart Home | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,549 |  |
Revenues | 1,549 |  |
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 |  |
Vivint Smart Home | Operating Segments | Retail Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 |  |
Vivint Smart Home | Operating Segments | Retail Revenue | Home |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,549 |  |
Vivint Smart Home | Operating Segments | Retail Revenue | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 |  |
Vivint Smart Home | Operating Segments | Total retail revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 1,549 |  |
Vivint Smart Home | Operating Segments | Energy revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 |  |
Derivative revenue | 0 |  |
Vivint Smart Home | Operating Segments | Capacity revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 |  |
Derivative revenue | 0 |  |
Vivint Smart Home | Operating Segments | Derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Mark-to-market for economic hedging activities | 0 |  |
Less: Realized and unrealized ASC 815 revenue | 0 |  |
Vivint Smart Home | Operating Segments | Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 0 |  |
Contract amortization | 0 |  |
Vivint Smart Home | Operating Segments | Total operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,549 |  |
Vivint Smart Home | Operating Segments | Other derivative revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Derivative revenue | 0 |  |
Vivint Smart Home | Corporate/Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 0 |  |

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