EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019			2018
Service cost	$	11		$	12
Pension expense included in Wages and benefits	11			12
Interest cost	22			20
Expected return on assets	(24		)	(27		)
Recognized actuarial loss	9			8
Pension expense included in Nonoperating Income (Expense)	$	7		$	1