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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
10

 
$
12

 
$
21

 
$
24

Pension expense included in Wages and benefits
10

 
12

 
21

 
24

 
 
 
 
 
 
 
 
Interest cost
22

 
19

 
44

 
39

Expected return on assets
(23
)
 
(26
)
 
(47
)
 
(53
)
Recognized actuarial loss
9

 
8

 
18

 
16

Pension expense included in Nonoperating Income (Expense)
$
8

 
$
1

 
$
15

 
$
2