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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 3,182 | $ 3,013 | $ 8,579 | $ 8,731
Regulated Electric | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,941 | 2,771 | 7,430 | 7,345
Regulated Natural Gas | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 219 | 222 | 1,082 | 1,324
All Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22 | 20 | 67 | 62
Total revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,963 | 2,875 | 8,078 | 8,378
Total revenue from contracts with customers | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,737 | 2,652 | 6,981 | 7,037
Total revenue from contracts with customers | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 208 | 206 | 1,041 | 1,288
Total revenue from contracts with customers | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 18 | 17 | 56 | 53
Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,534 | 2,482 | 6,942 | 7,295
Retail | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,097 | 999 | 3,035 | 3,046
Retail | C&I |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,401 | 1,447 | 3,809 | 4,148
Retail | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 36 | 36 | 98 | 101
Retail | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,336 | 2,283 | 5,931 | 6,038
Retail | Regulated Electric | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 962 | 865 | 2,356 | 2,216
Retail | Regulated Electric | C&I |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,340 | 1,383 | 3,481 | 3,724
Retail | Regulated Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 34 | 35 | 94 | 98
Retail | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 180 | 182 | 955 | 1,204
Retail | Regulated Natural Gas | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 124 | 124 | 647 | 801
Retail | Regulated Natural Gas | C&I |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 56 | 58 | 308 | 403
Retail | Regulated Natural Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Retail | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 18 | 17 | 56 | 53
Retail | All Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 11 | 10 | 32 | 29
Retail | All Other | C&I |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5 | 6 | 20 | 21
Retail | All Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2 | 1 | 4 | 3
Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 227 | 205 | 553 | 548
Wholesale | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 227 | 205 | 553 | 548
Wholesale | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Wholesale | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 157 | 151 | 442 | 409
Transmission | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 157 | 151 | 442 | 409
Transmission | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Transmission | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 45 | 37 | 141 | 126
Other | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 17 | 13 | 55 | 42
Other | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 28 | 24 | 86 | 84
Other | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Alternative revenue and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 219 | 138 | 501 | 353
Alternative revenue and other | Regulated Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 204 | 119 | 449 | 308
Alternative revenue and other | Regulated Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | 11 | 16 | 41 | 36
Alternative revenue and other | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Alternative revenue and other | $ 4 | $ 3 | $ 11 | $ 9

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