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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenues (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,011	$ 3,205	$ 8,998	$ 9,025
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	244	450	642	1,027
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	178	210	498	518
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42	63	135	180
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,475	3,928	10,273	10,750
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	187	154	491	507
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,227	1,305	3,882	3,853
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,739	1,856	4,996	5,036
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	45	44	120	136
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,662	4,082	10,764	11,257
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,785	2,885	7,170	7,219
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	244	450	642	1,027
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	178	210	498	518
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	20	22	55
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,216	3,565	8,332	8,819
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	171	134	419	436
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,086	1,109	2,708	2,723
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,657	1,734	4,347	4,385
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42	42	115	111
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,387	3,699	8,751	9,255
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	200	297	1,752	1,736
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	33	43	113	125
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	233	340	1,865	1,861
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	12	17	61	62
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	125	181	1,130	1,100
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	116	622	636
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	245	357	1,926	1,923
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	23	76	70
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	26	23	76	70
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	4	3	11	9
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	15	44	30
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	6	27	15
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	2	5	25
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 30	$ 26	$ 87	$ 79