UNITED PARCEL SERVICE INC | 2013 | FY | 3

Information about net periodic benefit cost for the company-sponsored pension and postretirement benefit plans is as follows (in millions):
 
U.S. Pension Benefits
 
U.S. Postretirement
Medical Benefits
 
International
Pension Benefits
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Net Periodic Cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
1,349

 
$
998

 
$
870

 
$
103

 
$
89

 
$
89

 
$
47

 
$
41

 
$
34

Interest cost
1,449

 
1,410

 
1,309

 
185

 
208

 
207

 
44

 
41

 
39

Expected return on assets
(2,147
)
 
(1,970
)
 
(1,835
)
 
(33
)
 
(18
)
 
(16
)
 
(55
)
 
(47
)
 
(43
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Transition obligation
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Prior service cost
172

 
173

 
171

 
4

 
5

 
7

 
2

 
2

 
1

Actuarial (gain) loss
—

 
4,388

 
736

 
—

 
374

 
—

 
—

 
69

 
91

Other
—

 
—

 
—

 
—

 
—

 
—

 
(5
)
 
(10
)
 
—

Net periodic benefit cost
$
823

 
$
4,999

 
$
1,251

 
$
259

 
$
658

 
$
287

 
$
33

 
$
96

 
$
122

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