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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
9.
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
 
2014
 
2013
 
2014
 
2013
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
30

 
$
35

 
$
1

 
$
3

Interest cost
23

 
22

 
4

 
5

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

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(6
)
 
(4
)
 
(3
)
Net actuarial loss
9

 
15

 
—

 
—

Net periodic benefit cost
$
24

 
$
32

 
$
1

 
$
5

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
60

 
$
71

 
$
3

 
$
6

Interest cost
46

 
44

 
8

 
9

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

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(10
)
 
(9
)
 
(9
)
 
(6
)
Net actuarial loss
17

 
29

 
—

 
—

Net periodic benefit cost
$
47

 
$
69

 
$
2

 
$
9



In February 2013, we announced changes to certain of our U.S. qualified pension plans that cover the majority of our U.S. employees who work in our refining segment and corporate operations. Benefits under our primary pension plan changed from a final average pay formula to a cash balance formula with staged effective dates that commence either on July 1, 2013 or January 1, 2015 depending on the age and service of the affected employees. All final average pay benefits will be frozen as of December 31, 2014, with all future benefits to be earned under the new cash balance formula. These plan amendments resulted in a $328 million decrease to pension liabilities and a related increase to other comprehensive income during the six months ended June 30, 2013. The benefit of this remeasurement will be amortized into income through 2025.

Our anticipated contributions to our pension and other postretirement benefit plans during 2014 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2013. We contributed $22 million and $22 million, respectively, to our pension plans and $9 million and $8 million, respectively, to our other postretirement benefit plans during the six months ended June 30, 2014 and 2013.