WILDFIRE-RELATED CONTINGENCIES (Summary of Insurance Receivables) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Insurance Receivable [Roll Forward]
Reimbursements	$ 35	$ (144)
2018 Camp fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	1,380
Accrued insurance recoveries	0
Reimbursements	0
Insurance Receivable, Ending Balance	1,380
2017 Northern California wildfires
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance	829
Accrued insurance recoveries	0
Reimbursements	0
Insurance Receivable, Ending Balance	$ 829