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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Service cost
$
12

 
$
10

 
$
24

 
$
20

Pension expense included in Wages and benefits
12

 
10

 
24

 
20

 
 
 
 
 
 
 
 
Interest cost
19

 
18

 
39

 
36

Expected return on assets
(26
)
 
(26
)
 
(53
)
 
(53
)
Recognized actuarial loss (gain)
8

 
6

 
16

 
13

Pension expense (benefit) included in Nonoperating Income (Expense)
$
1

 
$
(2
)
 
$
2

 
$
(4
)