WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire, 2021 Dixie Fire and 2022 Mosquito Fire) (Details) $ in Millions		3 Months Ended
	Jul. 13, 2021 USD ($) a injury structure	Mar. 31, 2026 USD ($)	Apr. 15, 2026 complaint claimHolder plaintiff	Jan. 31, 2026 entity	Dec. 31, 2025 USD ($)	Sep. 06, 2022 a fatality structure injury	Oct. 23, 2019 a structure fatality injury
2019 Kincade Fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a							77,758
Number of fatalities (fatality) | fatality							0
Number of injuries | injury							4
Number of structures destroyed (structure) | structure							374
Number of structures damaged (structure) | structure							60
Loss contingency liability					$ 1,325
Insurance receivable fully collected		$ 430
Liability insurance coverage, insurance receivable. fully recoveries		115
2021 Dixie fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a	963,309
Number of structures destroyed (structure) | structure	1,311
Number of structures damaged (structure) | structure	94
Number of residential structures destroyed (structure) | structure	763
Number of multi-family residential structures destroyed (structure) | structure	12
Number of commercial residential structures destroyed (structure) | structure	8
Number of commercial non-residential structures destroyed (structure) | structure	148
Number of detached structures destroyed (structure) | structure	466
Number of first responder injuries (injury) | injury	4
Estimated losses					2,150
Loss contingency, costs incurred	$ 650
Insurance receivable		521
Probable of recovery		2,307
2021 Dixie fire | Wildfire Fund
Loss Contingencies [Line Items]
Probable of recovery		1,150
Probable of recovery received		892
2021 Dixie fire | FERC TO rates
Loss Contingencies [Line Items]
Probable of recovery		97
2021 Dixie fire | WEMA
Loss Contingencies [Line Items]
Probable of recovery		539
2021 Dixie fire | National Park
Loss Contingencies [Line Items]
Number of acres burned (acre) | a	70,000
2021 Dixie fire | National Forrest
Loss Contingencies [Line Items]
Number of acres burned (acre) | a	685,000
2021 Dixie fire | Subsequent Event
Loss Contingencies [Line Items]
Number of complaints (complaint) | claimHolder			190
Number of plaintiffs represented by complaints | claimHolder			9,062
2022 Mosquito fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a						76,788
Number of fatalities (fatality) | fatality						0
Number of injuries | injury						0
Number of structures destroyed (structure) | structure						78
Number of structures damaged (structure) | structure						13
Loss contingency liability		400			$ 350
Number of residential structures destroyed (structure) | structure						44
Number of detached structures destroyed (structure) | structure						40
Insurance receivable		416
Probable of recovery		477
Percentage of fire contained						100.00%
Number of public entities | entity				5
Loss contingency accrual, period increase (decrease)		50
2022 Mosquito fire | Wildfire Fund
Loss Contingencies [Line Items]
Probable of recovery		0
2022 Mosquito fire | FERC TO rates
Loss Contingencies [Line Items]
Probable of recovery		7
2022 Mosquito fire | WEMA
Loss Contingencies [Line Items]
Probable of recovery		$ 54
2022 Mosquito fire | Subsequent Event
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint			30
Number of plaintiffs represented by complaints | plaintiff			2,931