SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of natural gas distribution services customers	2,200,000		2,200,000
Segment Reporting, Disclosure of Major Customers	—	—	—	—
Capital Expenditures Incurred but Not yet Paid			$ 4,300,000	$ 1,700,000
Allowance for Doubtful Accounts, Premiums and Other Receivables	$ 11,000,000.0		$ 11,000,000.0		$ 6,600,000
Operating Lease, Right-of-Use Asset						$ 32,000,000
Operating Lease, Liability						$ 32,000,000