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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2015
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
 
2015
 
2014
 
2015
 
2014
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
28

 
$
30

 
$
2

 
$
1

Interest cost
25

 
23

 
3

 
4

Expected return on plan assets
(34
)
 
(33
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(6
)
 
(5
)
 
(4
)
 
(4
)
Net actuarial loss
15

 
9

 
—

 
—

Net periodic benefit cost
$
28

 
$
24

 
$
1

 
$
1

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
55

 
$
60

 
$
4

 
$
3

Interest cost
49

 
46

 
7

 
8

Expected return on plan assets
(67
)
 
(66
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(11
)
 
(10
)
 
(9
)
 
(9
)
Net actuarial loss
31

 
17

 
—

 
—

Net periodic benefit cost
$
57

 
$
47

 
$
2

 
$
2



Our anticipated contributions to our pension and other postretirement benefit plans during 2015 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2014. We contributed $21 million and $22 million, respectively, to our pension plans and $6 million and $9 million, respectively, to our other postretirement benefit plans during the six months ended June 30, 2015 and 2014.