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Employment Benefit Plans
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Employment Benefit Plans
Employment Benefit Plans

Components of the net (credit) cost for the periods presented below for certain employee benefit plans were as follows (in millions):
 
 
Pension Benefits
 
 
Three Months Ended March 31,
Net Cost (Credit)
 
2018
 
2017
Service cost
 
$
11

 
$
10

Interest cost
 
21

 
22

Expected return on plan assets
 
(40
)
 
(37
)
Net credit recognized
 
$
(8
)
 
$
(5
)
 
 
 
 
 

 
 
Retiree Health and Welfare Benefits
 
 
Three Months Ended March 31,
Net Cost
 
2018
 
2017
Interest cost
 
$
2

 
$
2

Net cost recognized
 
$
2

 
$
2


 
 
 
 
 

Service cost is included in Compensation and Benefits expense and the other components of net periodic benefit costs are included in Other (Income) Expense, Net in the Consolidated Statements of Income.