EMPLOYEE BENEFITS PLANS (Pension and Other Postretirement Benefit Amounts included in Consolidated Balance Sheet ) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension And Other Employee Benefit Plans [Line Items]
Regulatory Assets	$ 384	$ 442
Pension Benefits
Pension And Other Employee Benefit Plans [Line Items]
Regulatory Assets	126	150
Accrued Employee Expenses	(1)	(1)
Pension and Other Postretirement Benefits	(61)	(91)
Accumulated Other Comprehensive Loss, SERP	13	14
Net Amount Recognized	77	72
Other Postretirement Benefits
Pension And Other Employee Benefit Plans [Line Items]
Regulatory Assets	2	16
Accrued Employee Expenses	(3)	(3)
Pension and Other Postretirement Benefits	(59)	(72)
Accumulated Other Comprehensive Loss, SERP	0	0
Net Amount Recognized	$ (60)	$ (59)