Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 14,708	$ 12,668	$ 10,847
Total revenue from contracts with customers | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11,623	10,576	9,198
Total revenue from contracts with customers | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,990	2,010	1,574
Total revenue from contracts with customers | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	95	82	75
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,404	10,315	9,299
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,409	4,461	4,083
Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,837	5,720	5,085
Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	158	134	131
Retail | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,497	8,371	7,787
Retail | Regulated Electric | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,542	3,194	3,066
Retail | Regulated Electric | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,807	5,050	4,596
Retail | Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	148	127	125
Retail | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,812	1,862	1,437
Retail | Natural Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,814	1,222	975
Retail | Natural Gas | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	998	640	462
Retail | Natural Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Retail | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	95	82	75
Retail | All Other | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	53	45	42
Retail | All Other | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	32	30	27
Retail | All Other | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10	7	6
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,354	1,540	759
Wholesale | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,354	1,540	759
Wholesale | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Wholesale | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	675	604	579
Transmission | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	675	604	579
Transmission | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Transmission | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	275	209	210
Other | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	97	61	73
Other | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	178	148	137
Other | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	602	763	679
Alternative revenue and other | Regulated Electric
Disaggregation of Revenue [Line Items]
Alternative revenue and other	500	629	604
Alternative revenue and other | Natural Gas
Disaggregation of Revenue [Line Items]
Alternative revenue and other	90	122	62
Alternative revenue and other | All Other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	12	12	13
Total revenues
Disaggregation of Revenue [Line Items]
Total revenues	15,310	13,431	11,526
Total revenues | Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	12,123	11,205	9,802
Total revenues | Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	3,080	2,132	1,636
Total revenues | All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 107	$ 94	$ 88