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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs Net periodic benefit costs for qualified defined-benefit plans include the following (in millions):
Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Service cost$11 $13 $22 $26 
Pension expense included in Wages and benefits11 13 22 26 
Interest cost16 14 32 28 
Expected return on assets(32)(30)(64)(61)
Recognized actuarial loss2 4 18 
Pension expense included in Nonoperating Income (Expense)$(14)$(7)$(28)$(15)