PENSION AND POST RETIREMENT BENEFITS (Components of Accumulated Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	$ 41	$ (451)
Actual returns on assets under (over) expected	1,165	(309)
Amortization of net actuarial gain (loss)	(13)	(32)
Amortization of prior service credits (costs)	(5)	(1)
Settlements	8	22
Plan amendments	122	0
OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(1,764)	(438)
Actual returns on assets under (over) expected	134	11
Amortization of net actuarial gain (loss)	43	(3)
Amortization of prior service credits (costs)	3	2
Settlements	0	0
Plan amendments	(163)	8
Discount rates | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(1,143)	(224)
Discount rates | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(441)	(117)
Demographic updates | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(102)	76
Demographic updates | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(7)	3
Mortality | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	17	19
Mortality | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	0	13
Per capita healthcare costs | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	0	0
Per capita healthcare costs | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(1,328)	(350)
Other | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(8)	(2)
Other | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(5)	(5)
Actuarial gain on benefit obligation | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	(1,236)	(131)
Actuarial gain on benefit obligation | OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain on benefit obligation	$ (1,781)	$ (456)