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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2021
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 March 31,
 20212020
Service cost$13 $13 
Pension expense included in Wages and benefits13 13 
Interest cost14 19 
Expected return on assets(31)(28)
Recognized actuarial loss9 9 
Pension expense included in Nonoperating Income (Expense)$(8)$—