BANKRUPTCY FILING (Chapter 11 Claims Process) (Details) $ in Millions	Oct. 27, 2020	Mar. 31, 2021 USD ($) claim	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proofs of claims		100,000
Disputed claims and customer refunds | $		$ 244	$ 242
Deadline extension period	180 days
Subrogation Wildfire Trust and Fire Victim Trust
Debt Instrument [Line Items]
Proofs of claims		80,000