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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenues (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,027	$ 3,011	$ 8,528	$ 8,998
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191	244	501	642
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	187	178	493	498
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	42	170	135
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,438	3,475	9,692	10,273
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	206	187	629	491
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,279	1,227	3,708	3,882
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,708	1,739	4,705	4,996
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40	45	115	120
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,644	3,662	10,321	10,764
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,825	2,785	7,166	7,170
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191	244	501	642
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	187	178	493	498
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	9	37	22
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,204	3,216	8,197	8,332
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	189	171	540	419
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,153	1,086	2,813	2,708
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,634	1,657	4,245	4,347
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	42	108	115
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,393	3,387	8,737	8,751
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	194	200	1,324	1,752
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	32	33	133	113
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	226	233	1,457	1,865
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	13	12	78	61
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	126	125	885	1,130
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	68	75	439	622
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	239	245	1,535	1,926
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	26	38	76
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	8	26	38	76
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	4	4	11	11
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	16	10	44
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	7	21	27
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	3	7	5
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 12	$ 30	$ 49	$ 87