Revenue from Contract with Customer - PAC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Total operating revenue	$ 25,920	$ 25,602	$ 26,337
PAC
Revenue from External Customer [Line Items]
Other revenue	61	29	52
Total operating revenue	6,600	5,936	5,679
Regulated assets | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	12,259	11,891	10,884
Regulated assets | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	361	553	1,024
Regulated assets | Transmission and distribution
Revenue from External Customer [Line Items]
Customer revenue	2,351	1,983	2,067
Regulated assets | Other
Revenue from External Customer [Line Items]
Customer revenue	126	136	105
Regulated assets | PAC
Revenue from External Customer [Line Items]
Customer revenue	6,539	5,907	5,627
Regulated assets | PAC | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	6,162	5,462	5,099
Regulated assets | PAC | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	80	165	260
Regulated assets | PAC | Transmission and distribution
Revenue from External Customer [Line Items]
Customer revenue	176	151	166
Regulated assets | PAC | Other
Revenue from External Customer [Line Items]
Customer revenue	121	129	102
Regulated assets | PAC | Residential | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	2,382	2,156	2,013
Regulated assets | PAC | Commercial | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	2,096	1,829	1,645
Regulated assets | PAC | Industrial | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	1,333	1,179	1,163
Regulated assets | PAC | Other retail | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	$ 351	$ 298	$ 278