PENSION AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net periodic benefit costs:
Employer contributions to pension plan	$ 0	$ 1,000,000	$ 0	$ 2,000,000
Contributions deferred till December 2020	5,000,000		5,000,000
Pension Benefit
Net periodic benefit costs:
Service cost	0	0	1,000,000	1,000,000
Interest cost	0	0	1,000,000	2,000,000
Expected return on plan assets	0	(1,000,000)	(1,000,000)	(2,000,000)
Recognized actuarial loss	0	1,000,000	1,000,000	1,000,000
Settlement loss	0	0	0	1,000,000
Total	0	0	2,000,000	3,000,000
Postretirement Benefit
Net periodic benefit costs:
Service cost	1,000,000	1,000,000	3,000,000	3,000,000
Interest cost	1,000,000	1,000,000	3,000,000	3,000,000
Expected return on plan assets	0	0	0	0
Recognized actuarial loss	0	0	0	0
Settlement loss	0	0	0	0
Total	$ 2,000,000	$ 2,000,000	$ 6,000,000	$ 6,000,000