FINANCIAL CHARGES AND OTHER (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Expense, Nonoperating [Abstract]
Interest expense	$ 19,000,000	$ 22,000,000	$ 59,000,000	$ 67,000,000
Net realized loss (gain) related to the interest rate swaps	2,000,000	0	4,000,000	(1,000,000)
AFUDC - Equity	(3,000,000)	0	(6,000,000)	(1,000,000)
Other income	(1,000,000)	(2,000,000)	(3,000,000)	(2,000,000)
Financial charges and other	$ 17,000,000	$ 20,000,000	$ 54,000,000	$ 63,000,000