EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,
	2020		2019
Service cost	$	13	$	11
Pension expense included in Wages and benefits	13		11
Interest cost	19		22
Expected return on assets	(28)		(24)
Recognized actuarial loss	9		9
Pension expense included in Nonoperating Income (Expense)	$	—	$	7