SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 95	$ 144
Interest cost	228	173
Expected return on plan assets	(245)	(297)
Amortization of prior service cost	(1)	(1)
Amortization of net actuarial loss	0	0
Net periodic benefit cost	77	19
Regulatory account transfer	6	64
Net periodic benefit cost	83	83
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	10	15
Interest cost	18	13
Expected return on plan assets	(33)	(32)
Amortization of prior service cost	1	2
Amortization of net actuarial loss	(5)	(10)
Net periodic benefit cost	(9)	(12)
Regulatory account transfer	0	0
Net periodic benefit cost	$ (9)	$ (12)