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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 7,861 | $ 8,359 | $ 21,592 | $ 23,825
Mark-to-market for economic hedging activities | (53) | (89) | (1,933) | 2,907
Revenue | 7,946 | 8,510 | 22,016 | 23,688
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 18 | 16 | 39 | 22
Derivative revenue | (54) | (80) | (1,909) | 2,900
Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (5) | (1) | (11) | (11)
Revenue | (5) | 12 | (21) | 29
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 | (1) | 0 | (1)
Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7,521 | 7,858 | 20,911 | 22,379
Derivative revenue | 14 | 90 | 57 | 90
Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 0 | (1) | (1)
Derivative revenue | 0 | 0 | 0 | 0
Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 261 | 450 | 472 | 1,034
Derivative revenue | 77 | (1) | 148 | (2)
Energy revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 10 | 0 | 24
Derivative revenue | 0 | 11 | 1 | 24
Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 59 | 38 | 150 | 244
Derivative revenue | 27 | 7 | 50 | 29
Capacity revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 0 | (1) | 0
Derivative revenue | 0 | 0 | 0 | 0
Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (70) | 33 | 96 | (248)
Less: Realized and unrealized ASC 815 revenue | 67 | 135 | 385 | (159)
Derivative revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 0 | 4 | (11) | 18
Less: Realized and unrealized ASC 815 revenue | 0 | 14 | (10) | 41
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 180 | 137 | 411 | 307
Contract amortization | (5) | (6) | (24) | (28)
Other revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (2) | (2) | (8) | (12)
Contract amortization | 0 | 0 | 0 | 0
Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,946 | 8,510 | 22,016 | 23,688
Total operating revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (5) | 12 | (21) | 29
Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 19 | 6 | 34 | (28)
Other revenue, derivative | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 | (1) | 0 | (1)
Home | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,808 | 3,033 | 9,327 | 8,212
Home | Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 0 | (1) | (1)
Business | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,713 | 4,825 | 11,584 | 14,167
Business | Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Texas | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,670 | 3,130 | 8,207 | 7,862
Revenue | 3,686 | 3,145 | 8,235 | 7,857
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 | 0 | 0 | 0
Texas | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,489 | 2,999 | 7,842 | 7,510
Derivative revenue | 0 | 0 | 0 | 0
Texas | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 51 | 48 | 71 | 101
Derivative revenue | 0 | 0 | 0 | 0
Texas | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 0
Texas | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 0 | 4 | 0 | 1
Less: Realized and unrealized ASC 815 revenue | 16 | 15 | 28 | (5)
Texas | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 146 | 94 | 322 | 245
Contract amortization | 0 | 0 | 0 | 0
Texas | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,686 | 3,145 | 8,235 | 7,857
Texas | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 16 | 11 | 28 | (6)
Texas | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,397 | 2,068 | 5,196 | 5,006
Texas | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,092 | 931 | 2,646 | 2,504
East | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,743 | 4,082 | 9,205 | 12,513
Revenue | 2,809 | 4,178 | 9,488 | 12,407
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 8 | 3 | 13 | (10)
East | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,633 | 3,863 | 9,007 | 11,784
Derivative revenue | 14 | 90 | 57 | 90
East | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 152 | 212 | 254 | 544
Derivative revenue | 77 | (39) | 137 | (13)
East | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 64 | 38 | 154 | 242
Derivative revenue | 27 | 7 | 50 | 29
East | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (60) | 32 | 27 | (204)
Less: Realized and unrealized ASC 815 revenue | 58 | 93 | 270 | (96)
East | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 26 | 43 | 70 | 71
Contract amortization | (6) | (10) | (24) | (30)
East | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,809 | 4,178 | 9,488 | 12,407
East | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 | 3 | (1) | 2
East | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 544 | 530 | 1,641 | 1,526
East | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,089 | 3,333 | 7,366 | 10,258
West/Services/Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 975 | 1,148 | 3,121 | 3,461
Revenue | 978 | 1,175 | 3,244 | 3,395
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 10 | 14 | 26 | 33
West/Services/Other | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 922 | 996 | 2,993 | 3,086
Derivative revenue | 0 | 0 | 0 | 0
West/Services/Other | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 59 | 180 | 147 | 365
Derivative revenue | 0 | 27 | 10 | (13)
West/Services/Other | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (4) | 0 | (3) | 2
Derivative revenue | 0 | 0 | 0 | 0
West/Services/Other | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (10) | (7) | 80 | (63)
Less: Realized and unrealized ASC 815 revenue | (7) | 13 | 97 | (99)
West/Services/Other | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 10 | 2 | 27 | 3
Contract amortization | 1 | 4 | 0 | 2
West/Services/Other | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 978 | 1,175 | 3,244 | 3,395
West/Services/Other | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 3 | (7) | 7 | (23)
West/Services/Other | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 390 | 435 | 1,421 | 1,681
West/Services/Other | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 532 | $ 561 | 1,572 | $ 1,405
Vivint Smart Home | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 478 |  | 1,070 |
Revenue | 478 |  | 1,070 |
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 0 |  | 0 |
Vivint Smart Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 478 |  | 1,070 |
Derivative revenue | 0 |  | 0 |
Vivint Smart Home | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
Derivative revenue | 0 |  | 0 |
Vivint Smart Home | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
Derivative revenue | 0 |  | 0 |
Vivint Smart Home | Derivative revenue | Operating Segments |  |  |  |
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 | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
Contract amortization | 0 |  | 0 |
Vivint Smart Home | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 478 |  | 1,070 |
Vivint Smart Home | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 |  | 0 |
Vivint Smart Home | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 478 |  | 1,070 |
Vivint Smart Home | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 0 |  | $ 0 |

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