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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2017
Defined Benefit Plan [Abstract]  
EMPLOYEE BENEFIT PLANS
8.
EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2017
 
2016
 
2017
 
2016
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
30

 
$
28

 
$
2

 
$
1

Interest cost
22

 
21

 
2

 
3

Expected return on plan assets
(38
)
 
(34
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
14

 
12

 
(1
)
 
—

Prior service credit
(5
)
 
(5
)
 
(4
)
 
(4
)
Net periodic benefit cost (credit)
$
23

 
$
22

 
$
(1
)
 
$
—

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
61

 
$
56

 
$
3

 
$
3

Interest cost
43

 
42

 
5

 
6

Expected return on plan assets
(75
)
 
(69
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
27

 
24

 
(2
)
 
—

Prior service credit
(10
)
 
(10
)
 
(8
)
 
(8
)
Net periodic benefit cost (credit)
$
46

 
$
43

 
$
(2
)
 
$
1



We contributed $14 million and $14 million, respectively, to our pension plans and $13 million and $8 million, respectively, to our other postretirement benefit plans during the six months ended June 30, 2017 and 2016.

Management has elected to increase the discretionary contributions to our pension plans by $80 million in the third quarter of 2017, resulting in expected contributions to our pension plans of $108 million for 2017. Our anticipated contributions to our other postretirement benefit plans during 2017 have not changed from the amount previously disclosed in our financial statements for the year ended December 31, 2016.