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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 8,359 | $ 6,490 | $ 23,825 | $ 19,687
Mark-to-market for economic hedging activities | (89) | 1,785 | 2,907 | 4,023
Revenue | 8,510 | 6,609 | 23,688 | 19,943
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 16 | (1) | 22 | (13)
Derivative revenue | (80) | 1,793 | 2,900 | 4,025
Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (1) | 0 | (11) | (5)
Revenue | 12 | 14 | 29 | 15
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | (1) | 0 | (1) | 0
Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7,858 | 5,951 | 22,379 | 16,929
Derivative revenue | 90 |  |  |
Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 1 | (1) | (1)
Derivative revenue | 0 |  |  |
Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 450 | 336 | 1,034 | 989
Derivative revenue | (1) | 41 | (2) | 120
Energy revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 10 | 4 | 24 | 6
Derivative revenue | 11 | 1 | 24 | 2
Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 38 | 189 | 244 | 615
Derivative revenue | 7 | 42 | 29 | 119
Capacity revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 0
Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 33 | 3 | (248) | (99)
Less: Realized and unrealized ASC 815 revenue | 135 | 120 | (159) | 269
Derivative revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 4 | 13 | 18 | 19
Less: Realized and unrealized ASC 815 revenue | 14 | 14 | 41 | 20
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 137 | 133 | 307 | 1,528
Contract amortization | (6) | (3) | (28) | (19)
Other revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (2) | (4) | (12) | (9)
Contract amortization | 0 | 0 | 0 | 0
Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,510 | 6,609 | 23,688 | 19,943
Total operating revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12 | 14 | 29 | 15
Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 6 | 34 | (28) | 129
Other revenue, derivative | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (1) | 0 | (1) | (1)
Home | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,049 | 2,646 | 8,360 | 7,391
Home | Retail revenue | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 1 | (1) | (1)
Business | Retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,809 | 3,305 | 14,019 | 9,538
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 | 3,134 | 2,597 | 7,873 | 8,233
Revenue | 3,149 | 2,635 | 7,868 | 8,362
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 | 3,005 | 2,503 | 7,528 | 6,575
Derivative revenue | 0 |  |  |
Texas | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 48 | 18 | 101 | 317
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 | 4 | (1) | 1 | (5)
Less: Realized and unrealized ASC 815 revenue | 15 | 38 | (5) | 129
Texas | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 92 | 115 | 238 | 1,475
Contract amortization | 0 | 0 | 0 | 0
Texas | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,149 | 2,635 | 7,868 | 8,362
Texas | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 11 | 39 | (6) | 134
Texas | Other revenue, 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 | 2,074 | 1,776 | 5,024 | 4,484
Texas | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 931 | 727 | 2,504 | 2,091
East | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,084 | 3,008 | 12,520 | 8,823
Revenue | 4,180 | 3,077 | 12,414 | 9,002
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 3 | (7) | (10) | (14)
East | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,863 | 2,698 | 11,784 | 8,029
Derivative revenue | 90 |  |  |
East | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 212 | 201 | 544 | 428
Derivative revenue | (39) | 38 | (13) | 122
East | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 38 | 172 | 242 | 568
Derivative revenue | 7 | 42 | 29 | 119
East | Derivative revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 32 | (3) | (204) | (53)
Less: Realized and unrealized ASC 815 revenue | 93 | 76 | (96) | 193
East | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 45 | 16 | 78 | 45
Contract amortization | (10) | (7) | (30) | (15)
East | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,180 | 3,077 | 12,414 | 9,002
East | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 3 | (1) | 2 | 5
East | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 546 | 470 | 1,674 | 1,469
East | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,317 | 2,228 | 10,110 | 6,560
West/Services/Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,142 | 885 | 3,443 | 2,636
Revenue | 1,169 | 883 | 3,377 | 2,564
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 | 14 | 6 | 33 | 1
West/Services/Other | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 990 | 749 | 3,068 | 2,326
Derivative revenue | 0 |  |  |
West/Services/Other | Energy revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 180 | 113 | 365 | 238
Derivative revenue | 27 | 2 | (13) | (4)
West/Services/Other | Capacity revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 17 | 2 | 47
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 | (7) | (6) | (63) | (60)
Less: Realized and unrealized ASC 815 revenue | 13 | (8) | (99) | (73)
West/Services/Other | Other revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2 | 6 | 3 | 17
Contract amortization | 4 | 4 | 2 | (4)
West/Services/Other | Total operating revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,169 | 883 | 3,377 | 2,564
West/Services/Other | Other revenue, derivative | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (7) | (4) | (23) | (9)
West/Services/Other | Home | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 429 | 399 | 1,663 | 1,439
West/Services/Other | Business | Retail revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 561 | $ 350 | $ 1,405 | $ 887

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