EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2021		2020
Service cost	$	13	$	13
Pension expense included in Wages and benefits	13		13
Interest cost	14		19
Expected return on assets	(31)		(28)
Recognized actuarial loss	9		9
Pension expense included in Nonoperating Income (Expense)	$	(8)	$	—