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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANSNet periodic benefit costs for qualified defined-benefit plans include the following (in millions):
Three Months Ended March 31,
 20222021
Service cost$11 $13 
Pension expense included in Wages and benefits11 13 
Interest cost16 14 
Expected return on assets(32)(31)
Recognized actuarial loss2 9 
Pension expense included in Nonoperating Income (Expense)$(14)$(8)