WILDFIRE-RELATED CONTINGENCIES (Insurance Receivable) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 29, 2020	Sep. 30, 2020
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	$ 580	$ 2,237
Accrued insurance recoveries		430
Reimbursements		(2,087)
Insurance Receivable, Ending Balance		580
2019 Kincade Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	430	0
Accrued insurance recoveries		430
Reimbursements		0
Insurance Receivable, Ending Balance		430
2018 Camp Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	0	1,380
Accrued insurance recoveries		0
Reimbursements		(1,380)
Insurance Receivable, Ending Balance		0
2017 Northern California wildfires
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	100	807
Accrued insurance recoveries		0
Reimbursements		(707)
Insurance Receivable, Ending Balance		100
2017 Northern California wildfires | Subsequent event
Insurance Receivable [Roll Forward]
Reimbursements	(75)
2015 Butte Fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	50	50
Accrued insurance recoveries		0
Reimbursements		0
Insurance Receivable, Ending Balance		$ 50
2015 Butte Fire | Subsequent event
Insurance Receivable [Roll Forward]
Reimbursements	$ (50)