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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS

Net periodic benefit costs for the qualified defined-benefit plans included the following components (in millions): 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
10

 
$
9

 
$
30

 
$
27

Interest cost
19

 
18

 
55

 
55

Expected return on assets
(27
)
 
(27
)
 
(80
)
 
(81
)
Amortization of prior service cost (credit)
(1
)
 
(1
)
 
(1
)
 
(1
)
Recognized actuarial loss (gain)
7

 
7

 
20

 
19

Total
$
8

 
$
6

 
$
24

 
$
19



The Company contributed $15 million to the defined-benefit pension plan during the three months ended September 30, 2017.