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Pensions and Other Benefit Programs
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pensions and Other Benefit Programs
Pensions and Other Benefit Programs
The components of net periodic benefit cost (income) were as follows:
 
Defined Benefit Pension Plans
 
Nonpension Postretirement Benefit Plans
 
United States
 
Foreign
 
 
 
Three Months Ended
 
Three Months Ended
 
Three Months Ended
 
March 31,
 
March 31,
 
March 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
30

 
$
32

 
$
542

 
$
527

 
$
419

 
$
501

Interest cost
17,244

 
18,830

 
4,544

 
5,661

 
1,771

 
2,136

Expected return on plan assets
(24,548
)
 
(25,589
)
 
(7,780
)
 
(8,472
)
 
—

 
—

Amortization of transition credit
—

 
—

 
(2
)
 
(2
)
 
—

 
—

Amortization of prior service (credit) cost
(15
)
 
(15
)
 
(18
)
 
(17
)
 
74

 
74

Amortization of net actuarial loss
7,268

 
6,706

 
2,034

 
1,343

 
884

 
1,360

Settlement (1)
—

 
1,098

 
—

 
—

 
—

 
—

Net periodic benefit cost (income)
$
(21
)
 
$
1,062

 
$
(680
)
 
$
(960
)
 
$
3,148

 
$
4,071



(1) Included in restructuring charges and asset impairments, net in the Condensed Consolidated Statements of Income.
Through March 31, 2017 and 2016, contributions to our U.S. pension plans were $2 million and $4 million, respectively, and contributions to our foreign plans were $9 million and $38 million, respectively. Nonpension postretirement benefit plan contributions were $5 million and $4 million through March 31, 2017 and March 31, 2016, respectively.