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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenues (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,205	$ 2,778	$ 9,025	$ 7,637
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	450	288	1,027	1,265
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210	167	518	461
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	63	62	180	157
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,928	3,295	10,750	9,520
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	154	172	507	556
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,305	1,144	3,853	3,295
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,856	1,598	5,036	4,241
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44	36	136	101
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	4,082	3,467	11,257	10,076
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,885	2,549	7,219	6,414
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	450	288	1,027	1,265
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210	167	518	461
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	17	55	51
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,565	3,021	8,819	8,191
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	134	155	436	452
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,109	999	2,723	2,488
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,734	1,515	4,385	3,830
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42	35	111	96
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,699	3,176	9,255	8,643
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	297	209	1,736	1,163
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	43	45	125	106
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	340	254	1,861	1,269
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	17	14	62	95
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	181	133	1,100	774
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	116	76	636	389
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	357	268	1,923	1,364
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	20	70	60
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	23	20	70	60
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	3	3	9	9
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15	12	30	33
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	7	15	22
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	1	25	5
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 26	$ 23	$ 79	$ 69