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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2021
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,
 2021202020212020
Service cost$13 $13 $26 $26 
Pension expense included in Wages and benefits13 13 26 26 
Interest cost14 19 28 38 
Expected return on assets(30)(27)(61)(55)
Recognized actuarial loss9 18 17 
Pension expense included in Nonoperating Income (Expense)$(7)$ $(15)$—