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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 3,032 | $ 3,501
Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 173 | 224
Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 158 | 163
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 78 | 57
Total revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,441 | 3,945
Alternative revenue and other |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue and other | 208 | 135
Residential | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,437 | 1,677
C&I | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,559 | 1,787
Other | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 36 | 37
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,649 | 4,080
Regulated Electric | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,169 | 2,263
Regulated Electric | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 173 | 224
Regulated Electric | Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 158 | 163
Regulated Electric | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 19 | 9
Regulated Electric | Total revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,519 | 2,659
Regulated Electric | Alternative revenue and other |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue and other | 166 | 104
Regulated Electric | Residential | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 859 | 875
Regulated Electric | C&I | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,276 | 1,352
Regulated Electric | Other | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 34 | 36
Regulated Electric | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,685 | 2,763
Regulated Natural Gas | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 842 | 1,212
Regulated Natural Gas | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Regulated Natural Gas | Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Regulated Natural Gas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 59 | 48
Regulated Natural Gas | Total revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 901 | 1,260
Regulated Natural Gas | Alternative revenue and other |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue and other | 40 | 28
Regulated Natural Gas | Residential | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 568 | 789
Regulated Natural Gas | C&I | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 274 | 423
Regulated Natural Gas | Other | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Regulated Natural Gas | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 941 | 1,288
All Other | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 21 | 26
All Other | Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
All Other | Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
All Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
All Other | Total revenue from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 21 | 26
All Other | Alternative revenue and other |  |
Disaggregation of Revenue [Line Items] |  |
Alternative revenue and other | 2 | 3
All Other | Residential | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10 | 13
All Other | C&I | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 9 | 12
All Other | Other | Retail |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2 | 1
All Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 23 | $ 29

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