SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 144	$ 147	$ 432	$ 440
Interest cost	173	161	519	484
Expected return on plan assets	(297)	(261)	(892)	(784)
Amortization of prior service cost	(1)	(1)	(3)	(4)
Amortization of net actuarial loss	0	1	1	4
Net periodic benefit cost	19	47	57	140
Regulatory account transfer	64	37	191	111
Net periodic benefit cost	83	84	248	251
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	15	15	46	47
Interest cost	13	13	40	39
Expected return on plan assets	(32)	(33)	(97)	(103)
Amortization of prior service cost	2	3	5	10
Amortization of net actuarial loss	(10)	(8)	(30)	(24)
Net periodic benefit cost	(12)	(10)	(36)	(31)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (12)	$ (10)	$ (36)	$ (31)