Revenue from Contracts with Customers - PAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,346	$ 6,030
Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,688	2,256
Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	191	236
Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	516	509
Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	34	22
PAC
Disaggregation of Revenue [Line Items]
Other revenue	4	5
Operating revenue	1,484	1,297
PAC | Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,480	1,292
PAC | Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,349	1,185
PAC | Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	61	55
PAC | Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	38	32
PAC | Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	32	20
PAC | Regulated | Residential | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	585	505
PAC | Regulated | Commercial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	430	370
PAC | Regulated | Industrial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	290	273
PAC | Regulated | Other retail | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 44	$ 37