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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 7,989 | $ 7,929
Mark-to-market for economic hedging activities | 2,277 | 721
Revenue | 7,896 | 8,091
Less: Revenues accounted for under topics other than 606 and 815 | 2 | 2
Derivative revenue | 2,263 | 725
Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (3) | (3)
Revenue | 17 | (1)
Less: Revenues accounted for under topics other than 606 and 815 | 0 | 0
Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,570 | 6,162
Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 278 | 482
Derivative revenue | 29 | 58
Energy revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 5 | 1
Derivative revenue | 4 | 2
Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 116 | 155
Derivative revenue | 13 | 37
Capacity revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (133) | (32)
Less: Realized and unrealized ASC 815 revenue | (95) | 160
Derivative revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 17 | 1
Less: Realized and unrealized ASC 815 revenue | 20 | 2
Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 74 | 1,324
Contract amortization | (9) |
Other revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (5) | (3)
Contract amortization | 0 |
Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 7,896 | 8,091
Total operating revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17 | (1)
Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (4) | 97
Other revenue, derivative | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (1) | (1)
Home | Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,661 | 2,471
Home | Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Business | Retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,909 | 3,691
Business | Retail revenue | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Texas | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,030 | 3,609
Revenue | 2,023 | 3,702
Less: Revenues accounted for under topics other than 606 and 815 | 0 | 0
Texas | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,952 | 2,114
Texas | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 15 | 285
Derivative revenue | 0 | 0
Texas | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Texas | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (2) | (1)
Less: Realized and unrealized ASC 815 revenue | (7) | 93
Texas | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 58 | 1,304
Contract amortization | 0 |
Texas | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,023 | 3,702
Texas | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (5) | 94
Texas | Other 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 | 1,289 | 1,333
Texas | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 663 | 781
East | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,793 | 3,396
Revenue | 4,718 | 3,495
Less: Revenues accounted for under topics other than 606 and 815 | (9) | 0
East | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,521 | 3,213
East | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 204 | 126
Derivative revenue | 45 | 60
East | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 115 | 141
Derivative revenue | 13 | 37
East | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (130) | (4)
Less: Realized and unrealized ASC 815 revenue | (66) | 99
East | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 17 | 19
Contract amortization | (9) |
East | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4,718 | 3,495
East | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 6 | 6
East | Home | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 675 | 584
East | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,846 | 2,629
West/Services/Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,169 | 927
Revenue | 1,138 | 895
Less: Revenues accounted for under topics other than 606 and 815 | 11 | 2
West/Services/Other | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,097 | 835
West/Services/Other | Energy revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 54 | 70
Derivative revenue | (20) | (4)
West/Services/Other | Capacity revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1 | 14
Derivative revenue | 0 | 0
West/Services/Other | Derivative revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (18) | (28)
Less: Realized and unrealized ASC 815 revenue | (42) | (34)
West/Services/Other | Other revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4 | 4
Contract amortization | 0 |
West/Services/Other | Total operating revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,138 | 895
West/Services/Other | Other revenue, derivative | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (4) | (2)
West/Services/Other | Home | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 697 | 554
West/Services/Other | Business | Retail revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 400 | $ 281

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