PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Narrative (Details) $ in Millions				3 Months Ended		6 Months Ended		12 Months Ended
	May 12, 2023 USD ($)	Apr. 30, 2023	Dec. 31, 2022	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2023	May 09, 2023 employee
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of eligible employees that accepted the voluntary retirement program									0.65
Number of employees | employee									450
Number of separated employees | employee									90
Defined benefit plan, assumptions used calculating benefit obligation, increase (decrease) in discount rate				0.29%
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary cash contribution	$ 750
Discount rate		4.94%	5.23%
Pension and OPEB mark-to-market adjustment				$ (59)	$ 0	$ (59)	$ 0
Voluntary contribution, percentage		7.70%
Estimated return		2.67%				800.00%
Pension | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate								8.00%
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate			5.16%
Pension and OPEB mark-to-market adjustment				0	$ 0	$ 0	$ 0
Estimated return						7.00%
Pension Mark-to-market Adjustment
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost, pre-tax				$ 47