WILDFIRE-RELATED CONTINGENCIES (Pre-petition Wildfire-Related Claims and Discharge Upon Plan Effective Date) (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 22, 2019
Loss Contingencies [Line Items]
Wildfire-related claims		$ 25,500.0		$ 25,500.0
Accrued environmental loss contingencies, current, elimination		12,150.0
Subrogation claims, professional fees							$ 55.0
Subsequent event
Loss Contingencies [Line Items]
Transfer of shares to Fire Victim Trust (in shares)	477.0
Plan of reorganization, tax benefits payment agreement	$ 1,350.0
Subsequent event | Settling Public Entities
Loss Contingencies [Line Items]
Litigation payment	1,000.0
Litigation, segregated reimbursement fund	10.0
Fire Victim Trust | Subsequent event
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)	477.0
Percentage of common stock owned, Fire Victim Trust if common issues additional shares	22.19%
Subrogation Wildfire Trust | Subsequent event
Loss Contingencies [Line Items]
Litigation payment, fund, cash	$ 11,000.0
Litigation payment	43.0
Subrogation claims, professional fees	$ 52.0
2019 Kincade Fire
Loss Contingencies [Line Items]
Legal fees		2.0		2.0
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Wildfire-related claims		25,500.0		25,500.0		$ 25,500.0
Subrogation insurance claims		11,000.0		11,000.0
Subrogation claims, expected professional fees		47.5		47.5
Subrogation claims, professional fees		52.0		52.0
Professional fees extinguished				47.5
Legal fees		24.0	$ 26.0	58.0	$ 73.0
Pacific Gas & Electric Co | Public Entity Wildfire Claims
Loss Contingencies [Line Items]
Wildfire-related claims		1,000.0		1,000.0
Pacific Gas & Electric Co | Public Entity Wildfire Claims | Settling Public Entities
Loss Contingencies [Line Items]
Wildfire-related claims		1,000.0		1,000.0
Pacific Gas & Electric Co | All Other Wildfire-related Claims
Loss Contingencies [Line Items]
Wildfire-related claims		$ 13,500.0		$ 13,500.0