WILDFIRE- RELATED CONTINGENCIES (Restructuring Support Agreement) (Details) $ in Millions	Jul. 01, 2020 USD ($)	Sep. 22, 2019 USD ($)	Dec. 31, 2020 USD ($)	Jun. 12, 2020	Dec. 06, 2019 USD ($)
Loss Contingencies [Line Items]
TCC claims settlement, amount	$ 11,000	$ 11,000
Subrogation claims, professional fees		$ 55
Fire Victim Trust
Loss Contingencies [Line Items]
Percentage of common stock owned, Fire Victim Trust if common issues additional shares	22.19%			22.19%
Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Subrogation claims, professional fees			$ 53
Cash					$ 1,350
Multiplier, normalized estimated net income					14.9
Number of fully diluted shares of the reorganized, percentage					20.90%
Pacific Gas & Electric Co (Utility) | Effective Date
Loss Contingencies [Line Items]
Cash contribution by company					$ 5,400
Pacific Gas & Electric Co (Utility) | On Or Before January 15, 2021
Loss Contingencies [Line Items]
Cash					758
Pacific Gas & Electric Co (Utility) | On Or Before January 15, 2022
Loss Contingencies [Line Items]
Cash					$ 592