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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 2,778 | $ 2,534 | $ 7,637 | $ 6,942
Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 288 | 227 | 1,265 | 553
Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 167 | 157 | 461 | 442
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 62 | 45 | 157 | 141
Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,295 | 2,963 | 9,520 | 8,078
Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 172 | 219 | 556 | 501
Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,144 | 1,097 | 3,295 | 3,035
C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,598 | 1,401 | 4,241 | 3,809
Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 36 | 36 | 101 | 98
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,467 | 3,182 | 10,076 | 8,579
Regulated Electric | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,549 | 2,336 | 6,414 | 5,931
Regulated Electric | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 288 | 227 | 1,265 | 553
Regulated Electric | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 167 | 157 | 461 | 442
Regulated Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 17 | 17 | 51 | 55
Regulated Electric | Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,021 | 2,737 | 8,191 | 6,981
Regulated Electric | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 155 | 204 | 452 | 449
Regulated Electric | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 999 | 962 | 2,488 | 2,356
Regulated Electric | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,515 | 1,340 | 3,830 | 3,481
Regulated Electric | Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 35 | 34 | 96 | 94
Regulated Electric | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,176 | 2,941 | 8,643 | 7,430
Regulated Natural Gas | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 209 | 180 | 1,163 | 955
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 | 45 | 28 | 106 | 86
Regulated Natural Gas | Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 254 | 208 | 1,269 | 1,041
Regulated Natural Gas | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 14 | 11 | 95 | 41
Regulated Natural Gas | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 133 | 124 | 774 | 647
Regulated Natural Gas | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 76 | 56 | 389 | 308
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 | 268 | 219 | 1,364 | 1,082
All Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 20 | 18 | 60 | 56
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 | 20 | 18 | 60 | 56
All Other | Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 3 | 4 | 9 | 11
All Other | Residential | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 12 | 11 | 33 | 32
All Other | C&I | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7 | 5 | 22 | 20
All Other | Other | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1 | 2 | 5 | 4
All Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 23 | $ 22 | $ 69 | $ 67

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