SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Wildfire Fund) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Initial contribution payment	$ 4,800
Annual contribution, first payment	193
Wildfire fund liability	5,200	$ 0
Litigation contribution, net	6,500
Wildfire fund asset	6,048	$ 0
Catch up amortization expense	$ 173
Monte carlo simulation, historical data, period	12 years
Wildfire Fund asset
Loss Contingencies [Line Items]
Finite-lived intangible asset, useful life	15 years
Noncurrent liabilities – other
Loss Contingencies [Line Items]
Wildfire fund, noncurrent	$ 1,500