EMPLOYEE BENEFITS PLANS (Components of Regulatory Assets and Accumulated Other Comprehensive Loss Not Recognized as Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Pension And Other Employee Benefit Plans [Line Items]
Net Loss	$ 139	$ 164
Prior Service Cost (Benefit)	0	1
Other Postretirement Benefits
Pension And Other Employee Benefit Plans [Line Items]
Net Loss	4	18
Prior Service Cost (Benefit)	$ (2)	$ (2)