WILDFIRE-RELATED CONTINGENCIES (Insurance Receivable) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	$ 2,237
Accrued insurance recoveries	430
Reimbursements	(529)
Insurance Receivable, Ending Balance	2,138
2019 Kincade Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	0
Accrued insurance recoveries	430
Reimbursements	0
Insurance Receivable, Ending Balance	430
2018 Camp Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	1,380
Accrued insurance recoveries	0
Reimbursements	(408)
Insurance Receivable, Ending Balance	972
2017 Northern California wildfires
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	807
Accrued insurance recoveries	0
Reimbursements	(121)
Insurance Receivable, Ending Balance	686
Butte Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	50
Accrued insurance recoveries	0
Reimbursements	0
Insurance Receivable, Ending Balance	$ 50