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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenues (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,469	$ 2,486	$ 5,501	$ 5,987
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137	174	310	398
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	148	157	306	320
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	59	36	137	93
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,813	2,853	6,254	6,798
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	215	169	423	304
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	992	979	2,429	2,655
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,438	1,469	2,997	3,257
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39	38	75	75
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,028	3,022	6,677	7,102
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,172	2,122	4,341	4,385
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137	174	310	398
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	148	157	306	320
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	4	36	13
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,474	2,457	4,993	5,116
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	185	144	351	248
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	801	748	1,660	1,622
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,335	1,337	2,611	2,690
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36	37	70	73
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,659	2,601	5,344	5,364
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	288	340	1,130	1,552
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	42	32	101	80
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	330	372	1,231	1,632
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	25	21	65	49
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191	216	759	1,005
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	97	124	371	547
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	355	393	1,296	1,681
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	24	30	50
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	24	30	50
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	5	4	7	7
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	15	10	28
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	8	15	20
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	1	5	2
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 14	$ 28	$ 37	$ 57