Revenue from Contracts with Customers - PAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,229	$ 6,612	$ 12,575	$ 12,642
Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,844	2,591	5,532	4,847
Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	89	187	280	423
Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	476	522	992	1,031
Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	23	28	57	50
PAC
Disaggregation of Revenue [Line Items]
Other revenue	11	19	15	24
Operating revenue	1,327	1,314	2,811	2,611
PAC | Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,316	1,295	2,796	2,587
PAC | Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,232	1,167	2,581	2,352
PAC | Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	26	55	87	110
PAC | Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	34	45	72	77
PAC | Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	24	28	56	48
PAC | Regulated | Residential | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	450	417	1,035	922
PAC | Regulated | Commercial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	429	393	859	763
PAC | Regulated | Industrial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	270	277	560	550
PAC | Regulated | Other retail | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 83	$ 80	$ 127	$ 117