EMPLOYEE BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 379	$ 575	$ 587
Interest cost	913	692	645
Expected return on plan assets	(981)	(1,189)	(1,046)
Amortization of prior service cost	(4)	(4)	(6)
Amortization of net actuarial gain (loss)	1	2	6
Net periodic benefit cost	308	76	186
Less: transfer to regulatory account	25	254	147
Total expense recognized	333	330	333
PBOP Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	38	62	63
Interest cost	73	53	51
Expected return on plan assets	(132)	(130)	(137)
Amortization of prior service cost	3	7	14
Amortization of net actuarial gain (loss)	(19)	(40)	(33)
Special termination benefits	0	22	0
Net periodic benefit cost	$ (37)	$ (26)	$ (42)