EMPLOYEE BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 575	$ 587	$ 530
Interest cost	692	645	713
Expected return on plan assets	(1,189)	(1,046)	(1,044)
Amortization of prior service cost	(4)	(6)	(6)
Amortization of net actuarial loss	2	6	3
Net periodic benefit cost	76	186	196
Less: transfer to regulatory account	254	147	136
Total expense recognized	330	333	332
PBOP Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	62	63	61
Interest cost	53	51	63
Expected return on plan assets	(130)	(137)	(138)
Amortization of prior service cost	7	14	14
Amortization of net actuarial loss	(40)	(33)	(21)
Special termination benefits	22	0	0
Net periodic benefit cost	$ (26)	$ (42)	$ (21)