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Pensions and Other Benefit Programs
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [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
 
September 30,
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
34

 
$
26

 
$
587

 
$
549

 
$
438

 
$
512

Interest cost
17,122

 
18,452

 
4,809

 
5,366

 
1,780

 
1,994

Expected return on plan assets
(24,369
)
 
(25,480
)
 
(8,214
)
 
(7,976
)
 
—

 
—

Amortization of transition credit
—

 
—

 
(2
)
 
(2
)
 
—

 
—

Amortization of prior service (credit) cost
(15
)
 
(15
)
 
(18
)
 
(19
)
 
74

 
74

Amortization of net actuarial loss
7,229

 
6,779

 
2,055

 
1,302

 
905

 
904

Settlement (1)
—

 
183

 
—

 
—

 
—

 
—

Net periodic benefit cost (income)
$
1

 
$
(55
)
 
$
(783
)
 
$
(780
)
 
$
3,197

 
$
3,484

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Defined Benefit Pension Plans
 
Nonpension Postretirement Benefit Plans
 
United States
 
Foreign
 
 
 
Nine Months Ended
 
Nine Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
98

 
$
80

 
$
1,688

 
$
1,622

 
$
1,290

 
$
1,534

Interest cost
51,488

 
55,354

 
13,993

 
16,773

 
5,321

 
5,977

Expected return on plan assets
(73,287
)
 
(76,439
)
 
(23,956
)
 
(25,029
)
 
—

 
—

Amortization of transition credit
—

 
—

 
(6
)
 
(6
)
 
—

 
—

Amortization of prior service (credit) cost
(45
)
 
(45
)
 
(53
)
 
(54
)
 
223

 
222

Amortization of net actuarial loss
21,725

 
20,336

 
5,981

 
4,018

 
2,693

 
2,711

Settlement (1)
—

 
1,971

 
—

 
—

 
—

 
—

Net periodic benefit cost (income)
$
(21
)
 
$
1,257

 
$
(2,353
)
 
$
(2,676
)
 
$
9,527

 
$
10,444



(1) Included in restructuring charges and asset impairments, net in the Condensed Consolidated Statements of Income.
Through September 30, 2017 and 2016, contributions to our U.S. pension plans were $5 million and $8 million, respectively, and contributions to our foreign plans were $11 million and $41 million, respectively. Nonpension postretirement benefit plan contributions were $13 million and $14 million through September 30, 2017 and September 30, 2016, respectively.