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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net periodic benefit costs for qualified pension plans include the following:
Three Months Ended March 31,
(in millions)20252024
Service cost$7 $7 
Pension expense included in Wages and benefits7 7 
Interest cost33 27 
Expected return on assets(37)(32)
Recognized actuarial loss3 5 
Pension expense included in Non-operating Income (Expense)$(1)$—