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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
11

 
$
12

 
$
32

 
$
36

Pension expense included in Wages and benefits
11

 
12

 
32

 
36

 
 
 
 
 
 
 
 
Interest cost
23

 
20

 
67

 
59

Expected return on assets
(24
)
 
(27
)
 
(71
)
 
(80
)
Amortization of prior service cost (credit)
(1
)
 
(1
)
 
(1
)
 
(1
)
Recognized actuarial loss
9

 
9

 
27

 
25

Pension expense included in Nonoperating Income (Expense)
$
7

 
$
1

 
$
22

 
$
3