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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
Net periodic benefit cost includes the following components:
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended September 30,
(in millions)
2018
 
2017
 
2018
 
2017
Service Cost
$
4

 
$
3

 
$
1

 
$
1

Interest Cost
4

 
3

 
1

 
1

Expected Return on Plan Assets
(7
)
 
(6
)
 
(1
)
 
(1
)
Amortization of Net Loss
1

 
2

 
—

 
—

Net Periodic Benefit Cost
$
2

 
$
2

 
$
1

 
$
1

 
Nine Months Ended September 30,
(in millions)
2018
 
2017
 
2018
 
2017
Service Cost
$
11

 
$
9

 
$
3

 
$
3

Interest Cost
12

 
11

 
2

 
2

Expected Return on Plan Assets
(21
)
 
(18
)
 
(1
)
 
(1
)
Amortization of Net Loss
5

 
6

 
—

 
—

Net Periodic Benefit Cost
$
7

 
$
8

 
$
4

 
$
4


The non-service components of net periodic benefit cost are included in Other, Net on the Condensed Consolidated Statements of Income.