Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 4,785	$ 4,965	$ 4,049
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,423	2,559	2,002
Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,305	2,354	1,998
Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	57	52	49
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	237	286	228
Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	90	88	75
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	193	204	203
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,305	5,543	4,555
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	214	165	260
Regulated Electric | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,163	3,236	2,883
Regulated Electric | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,295	1,341	1,174
Regulated Electric | Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,816	1,843	1,660
Regulated Electric | Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	52	52	49
Regulated Electric | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	237	286	228
Regulated Electric | Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	90	88	75
Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	61	53	44
Regulated Electric | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,551	3,663	3,230
Regulated Electric | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	180	132	183
Regulated Natural Gas | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,568	1,682	1,124
Regulated Natural Gas | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,109	1,203	816
Regulated Natural Gas | Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	459	479	308
Regulated Natural Gas | Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Regulated Natural Gas | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Regulated Natural Gas | Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Regulated Natural Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	132	151	159
Regulated Natural Gas | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,700	1,833	1,283
Regulated Natural Gas | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	34	27	72
All Other | Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	54	47	42
All Other | Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19	15	12
All Other | Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	30	32	30
All Other | Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5	0	0
All Other | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
All Other | Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
All Other | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
All Other | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	54	47	42
All Other | Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	0	6	5
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	5,519	5,708	4,815
Total revenues | Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	3,731	3,795	3,413
Total revenues | Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	1,734	1,860	1,355
Total revenues | All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 54	$ 53	$ 47