WILDFIRE-RELATED CONTINGENCIES (Pre-petition Wildfire-Related Claims and Discharge Upon Plan Effective Date) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jul. 01, 2020	Sep. 30, 2020	Jun. 30, 2020	Jan. 15, 2021	Dec. 31, 2020	Aug. 03, 2020	Jun. 12, 2020	Sep. 22, 2019
Loss Contingencies [Line Items]
Transfer of shares to Fire Victim Trust (in shares)	477,000,000.0
Transfer of shares to Fire Victim Trust, additional (in shares)						748,415
Accrued environmental loss contingencies, current, elimination			$ 12,150.0
Plan of reorganization, tax benefits payment agreement	$ 1,350.0
Subrogation claims, professional fees								$ 55.0
Subsequent Event
Loss Contingencies [Line Items]
Payment of plan of reorganization, tax benefits payment agreement				$ 758.0
Settling Public Entities
Loss Contingencies [Line Items]
Litigation payment	1,000.0
Litigation, segregated reimbursement fund	10.0
Fire Victim Trust
Loss Contingencies [Line Items]
Litigation payment, fund, cash	5,400.0
Litigation payment, additional funded, deferred	$ 1,350.0
Transfer of shares to Fire Victim Trust (in shares)	477,000,000
Percentage of common stock owned, Fire Victim Trust if common issues additional shares	22.19%						22.19%
Transfer of shares to Fire Victim Trust, additional (in shares)						748,415
Subrogation Wildfire Trust
Loss Contingencies [Line Items]
Litigation payment, fund, cash	$ 11,000.0
Litigation payment	43.0
Subrogation claims, professional fees	$ 52.0
Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Subrogation claims, professional fees					$ 53.0
Subrogation insurance claims		$ 11,000.0
Professional fees extinguished		47.5
Pacific Gas & Electric Co (Utility) | All Other Wildfire-related Claims
Loss Contingencies [Line Items]
Wildfire-related claims			$ 13,500.0
Pacific Gas & Electric Co (Utility) | Public Entity Wildfire Claims | Settling Public Entities
Loss Contingencies [Line Items]
Wildfire-related claims		$ 1,000.0