Revenues (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 1,543	$ 1,230
Retail \| Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	878	691
Retail \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	651	527
Retail \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14	12
Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75	66
Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25	19
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	55	55
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,698	1,370
Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	49	53
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	770	697
Regulated Electric \| Retail \| Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	333	302
Regulated Electric \| Retail \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	423	383
Regulated Electric \| Retail \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14	12
Regulated Electric \| Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75	66
Regulated Electric \| Transmission Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25	19
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11	12
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	881	794
Regulated Electric \| Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	39	34
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	757	528
Regulated Natural Gas \| Retail \| Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	541	386
Regulated Natural Gas \| Retail \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	216	142
Regulated Natural Gas \| Retail \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Regulated Natural Gas \| Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Regulated Natural Gas \| Transmission Services [Member]
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	44	43
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	801	571
Regulated Natural Gas \| Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	10	7
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16	5
All Other \| Retail \| Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4	3
All Other \| Retail \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12	2
All Other \| Retail \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
All Other \| Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
All Other \| Transmission Services [Member]
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	16	5
All Other \| Alternative and Other [Member]
Disaggregation of Revenue [Line Items]
Alternative revenue and other	0	12
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,747	1,423
Total revenues \| Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	920	828
Total revenues \| Regulated Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	811	578
Total revenues \| All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 16	$ 17

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