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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
7.
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
 
2016
 
2015
 
2016
 
2015
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
28

 
$
27

 
$
2

 
$
2

Interest cost
21

 
24

 
3

 
4

Expected return on plan assets
(35
)
 
(33
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(5
)
 
(4
)
 
(5
)
Net actuarial (gain) loss
13

 
16

 
(1
)
 
—

Special credits
(7
)
 
—

 
—

 
—

Net periodic benefit cost
$
15

 
$
29

 
$
—

 
$
1

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
84

 
$
82

 
$
5

 
$
6

Interest cost
63

 
73

 
9

 
11

Expected return on plan assets
(104
)
 
(100
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(16
)
 
(12
)
 
(14
)
Net actuarial (gain) loss
37

 
47

 
(1
)
 
—

Special charges (credits)
(7
)
 
5

 
—

 
—

Net periodic benefit cost
$
58

 
$
91

 
$
1

 
$
3



We contributed $132 million and $114 million, respectively, to our pension plans and $12 million and $11 million, respectively, to our other postretirement benefit plans during the nine months ended September 30, 2016 and 2015. Of the $132 million contributed to our pension plans during the nine months ended September 30, 2016, $100 million was discretionary and was contributed during the third quarter of 2016.

As a result of the discretionary pension contributions discussed above, our expected contributions to our pension plans have increased to $136 million for 2016. Our anticipated contributions to our other postretirement benefit plans during 2016 have not changed from the amount previously disclosed in our financial statements for the year ended December 31, 2015.