WILDFIRE-RELATED CONTINGENCIES (Insurance) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jul. 31, 2019
2018 Camp Fire and 2017 Northern California Wildfires
Loss Contingencies [Line Items]
Liability insurance coverage		$ 1,400
Liability insurance coverage, general liability		700
Initial self-insured retention per occurrence		10
Liability insurance coverage, property damages		700
Liability insurance coverage, property damages, reinsurance		$ 200
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage	$ 430
Insurance Coverage for Wildfire Events | August 1, 2019 - July 31, 2020
Loss Contingencies [Line Items]
Liability insurance coverage	430
Initial self-insured retention per occurrence	10
Insurance Coverage for Wildfire Liabilities
Loss Contingencies [Line Items]
Liability insurance coverage	1,000
Initial self-insured retention per occurrence	10
Insurance Coverage for Wildfire Liabilities | August 1, 2019 - July 31, 2020
Loss Contingencies [Line Items]
Liability insurance coverage	520
Insurance Coverage for Wildfire Liabilities | September 3, 2019 - September 2, 2020
Loss Contingencies [Line Items]
Liability insurance coverage	480
2018 Camp Fire
Loss Contingencies [Line Items]
Estimated insurance recoveries	1,380
Insurance settlements receivable	1,380
2017 Northern California wildfires
Loss Contingencies [Line Items]
Estimated insurance recoveries	843
Insurance settlements receivable	$ 807