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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2020
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,
 20202019
Service cost$13  $11  
Pension expense included in Wages and benefits13  11  
Interest cost19  22  
Expected return on assets(28) (24) 
Recognized actuarial loss9  9  
Pension expense included in Nonoperating Income (Expense)$—  $7