EMPLOYEE BENEFITS PLANS (Changes in Regulatory Assets and Accumulated Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits | Regulatory Asset
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current Year Actuarial (Gain) Loss	$ (16)	$ 23	$ 16
Amortization of Net Loss	(8)	(8)	(8)
Prior Service (Credit) Cost	0	0	0
Total Recognized (Gain) Loss	(24)	15	8
Pension Benefits | AOCI
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current Year Actuarial (Gain) Loss	0	5	4
Amortization of Net Loss	(1)	(1)	(1)
Prior Service (Credit) Cost	0	0	1
Total Recognized (Gain) Loss	(1)	4	4
Other Postretirement Benefits | Regulatory Asset
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current Year Actuarial (Gain) Loss	(13)	17	1
Amortization of Net Loss	(1)	0	0
Prior Service (Credit) Cost	0	0	0
Total Recognized (Gain) Loss	$ (14)	$ 17	$ 1