SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 95	$ 144	$ 190	$ 288
Interest cost	229	173	457	346
Expected return on plan assets	(246)	(298)	(491)	(595)
Amortization of prior service cost	(1)	(1)	(2)	(2)
Amortization of net actuarial loss	0	1	0	1
Net periodic benefit cost	77	19	154	38
Regulatory account transfer	(6)	64	(13)	127
Net periodic benefit cost	71	83	141	165
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	9	16	19	31
Interest cost	19	14	37	27
Expected return on plan assets	(33)	(33)	(66)	(65)
Amortization of prior service cost	0	1	1	3
Amortization of net actuarial loss	(4)	(10)	(9)	(20)
Net periodic benefit cost	(9)	(12)	(18)	(24)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (9)	$ (12)	$ (18)	$ (24)