Revenue from Contracts with Customers - PAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 4,745	$ 4,199	$ 9,464	$ 8,911
Operating revenue	6,612	6,064	12,642	12,145
Other revenue
Disaggregation of Revenue [Line Items]
Operating revenue	195	102	299	239
Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	3,989	3,587	8,104	7,681
Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,591	2,411	4,847	4,519
Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	187	108	423	301
Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	522	495	1,031	991
Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	28	31	50	56
PAC
Disaggregation of Revenue [Line Items]
Operating revenue	1,314	1,298	2,611	2,540
PAC | Other revenue
Disaggregation of Revenue [Line Items]
Operating revenue	19	12	24	25
PAC | Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,295	1,286	2,587	2,515
PAC | Regulated | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,167	1,188	2,352	2,333
PAC | Regulated | Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	55	30	110	66
PAC | Regulated | Transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	45	37	77	62
PAC | Regulated | Other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	28	31	48	54
PAC | Regulated | Residential | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	417	429	922	912
PAC | Regulated | Commercial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	393	393	763	752
PAC | Regulated | Industrial | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	277	282	550	553
PAC | Regulated | Other retail | Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 80	$ 84	$ 117	$ 116