PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Assumptions Used to Determine Net Periodic Benefit Cost (Details)	8 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	5.05%	5.05%	5.23%	3.02%
Rate of compensation increase	4.30%	4.30%	4.30%	4.10%
Cash balance weighted average interest crediting rate		4.94%	4.04%	2.57%
Weighted-average discount rate	8.00%
Expected return on plan assets		8.00%	7.50%	7.50%
Rate of compensation increase		4.30%	4.10%	4.10%
Pension | Interest on Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate			2.44%
Pension | Interest on Benefit Obligations | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.10%		1.94%
Pension | Interest on Benefit Obligations | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		4.80%
Pension | Service Cost
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate			3.28%
Pension | Service Cost | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.34%		3.10%
Pension | Service Cost | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.11%
Pension | Interest Cost
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate			2.96%
Pension | Interest Cost | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.22%		2.58%
Pension | Interest Cost | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		4.94%
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.97%	4.97%	5.16%	2.84%
Expected return on plan assets		7.00%	7.50%	7.50%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	4.50%	4.50%	4.50%	4.50%
OPEB | Pre Medicare
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed (pre/post-Medicare)	7.00%	7.00%	6.00%	5.75%
OPEB | Post Medicare
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed (pre/post-Medicare)	6.50%	6.50%	5.50%	5.25%
OPEB | Interest on Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.06%	2.18%
OPEB | Interest on Benefit Obligations | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate				1.66%
OPEB | Service Cost
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.41%	3.41%
OPEB | Service Cost | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate				3.03%
OPEB | Interest Cost
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate		5.33%	3.24%
OPEB | Interest Cost | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate				2.83%