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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 3,011 | $ 3,205 | $ 8,998 | $ 9,025
Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 244 | 450 | 642 | 1,027
Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 178 | 210 | 498 | 518
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 42 | 63 | 135 | 180
Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,475 | 3,928 | 10,273 | 10,750
Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 187 | 154 | 491 | 507
Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,227 | 1,305 | 3,882 | 3,853
C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,739 | 1,856 | 4,996 | 5,036
Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 45 | 44 | 120 | 136
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,662 | 4,082 | 10,764 | 11,257
Regulated Electric | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,785 | 2,885 | 7,170 | 7,219
Regulated Electric | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 244 | 450 | 642 | 1,027
Regulated Electric | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 178 | 210 | 498 | 518
Regulated Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9 | 20 | 22 | 55
Regulated Electric | Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,216 | 3,565 | 8,332 | 8,819
Regulated Electric | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 171 | 134 | 419 | 436
Regulated Electric | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,086 | 1,109 | 2,708 | 2,723
Regulated Electric | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,657 | 1,734 | 4,347 | 4,385
Regulated Electric | Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 42 | 42 | 115 | 111
Regulated Electric | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,387 | 3,699 | 8,751 | 9,255
Regulated Natural Gas | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 200 | 297 | 1,752 | 1,736
Regulated Natural Gas | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Regulated Natural Gas | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Regulated Natural Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 33 | 43 | 113 | 125
Regulated Natural Gas | Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 233 | 340 | 1,865 | 1,861
Regulated Natural Gas | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 12 | 17 | 61 | 62
Regulated Natural Gas | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 125 | 181 | 1,130 | 1,100
Regulated Natural Gas | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 75 | 116 | 622 | 636
Regulated Natural Gas | Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Regulated Natural Gas | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 245 | 357 | 1,926 | 1,923
All Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 26 | 23 | 76 | 70
All Other | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
All Other | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
All Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
All Other | Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 26 | 23 | 76 | 70
All Other | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 4 | 3 | 11 | 9
All Other | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 16 | 15 | 44 | 30
All Other | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7 | 6 | 27 | 15
All Other | Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3 | 2 | 5 | 25
All Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 30 | $ 26 | $ 87 | $ 79

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