RETIREMENT BENEFITS - Schedule of Health Care Cost Trend Rates (Details)	Dec. 31, 2023
Pre-65
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	7.00%
Ultimate Cost Trend Rate	4.50%
Post-65 medical
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	5.50%
Ultimate Cost Trend Rate	4.50%
Post-65 prescription
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	8.50%
Ultimate Cost Trend Rate	4.50%