WILDFIRE-RELATED CONTINGENCIES (Wildfire-Related Securities Class Action Litigation and Debt Claims) (Details)	Dec. 31, 2020 lawsuit	Feb. 22, 2019 offering	Jun. 30, 2018 lawsuit
Wildfire-Related Class Action
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint)			2
Number of public offerings of notes with complaints against underwriters (offering) | offering		4
Satisfaction of HoldCo Rescission or Damage Claims and Subordinated Debt
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint)	3