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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Net periodic benefit costs for qualified defined-benefit plans include the following (in millions):
Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Service cost$7 $7 $14 $14 
Pension expense included in Wages and benefits7 7 14 14 
Interest cost27 27 54 54 
Expected return on assets(32)(29)(64)(57)
Recognized actuarial loss4 6 9 12 
Pension expense (benefit) included in Non-operating Income$(1)$4 $(1)$9