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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenues (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,733	$ 2,469	$ 5,990	$ 5,501
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	145	137	351	310
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	169	148	341	306
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	59	135	137
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,114	2,813	6,817	6,254
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	173	215	376	423
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,093	992	2,650	2,429
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,600	1,438	3,263	2,997
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40	39	77	75
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,287	3,028	7,193	6,677
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,393	2,172	4,685	4,341
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	145	137	351	310
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	169	148	341	306
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	17	39	36
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,729	2,474	5,416	4,993
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	149	185	297	351
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	881	801	1,805	1,660
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,474	1,335	2,807	2,611
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	36	73	70
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,878	2,659	5,713	5,344
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	331	288	1,283	1,130
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	45	42	96	101
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	376	330	1,379	1,231
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	20	25	72	65
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	212	191	844	759
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	119	97	439	371
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	396	355	1,451	1,296
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	9	22	30
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	9	9	22	30
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	4	5	7	7
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	1	10
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	6	17	15
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	3	4	5
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 13	$ 14	$ 29	$ 37