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Pensions and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits
Pensions and Other Postretirement Benefits
 
Three Months Ended June 30, 2017
 
Three Months Ended June 30, 2016
 
Pension Benefits
 
Global OPEB Plans
 
Pension Benefits
 
Global OPEB Plans
 
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
79

 
$
40

 
$
6

 
$
96

 
$
59

 
$
4

Interest cost
536

 
126

 
49

 
553

 
126

 
50

Expected return on plan assets
(919
)
 
(172
)
 
—

 
(944
)
 
(177
)
 
—

Amortization of prior service cost (credit)
(1
)
 
1

 
(4
)
 
(1
)
 
3

 
(3
)
Amortization of net actuarial (gains) losses
(2
)
 
48

 
8

 
(7
)
 
35

 
5

Net periodic pension and OPEB (income) expense
$
(307
)
 
$
43

 
$
59

 
$
(303
)
 
$
46

 
$
56



 
Six Months Ended June 30, 2017
 
Six Months Ended June 30, 2016
 
Pension Benefits
 
Global OPEB Plans
 
Pension Benefits
 
Global OPEB Plans
 
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
158

 
$
86

 
$
10

 
$
191

 
$
115

 
$
9

Interest cost
1,072

 
251

 
98

 
1,106

 
257

 
100

Expected return on plan assets
(1,838
)
 
(343
)
 
—

 
(1,889
)
 
(359
)
 
—

Amortization of prior service cost (credit)
(2
)
 
2

 
(7
)
 
(2
)
 
6

 
(7
)
Amortization of net actuarial (gains) losses
(3
)
 
95

 
16

 
(13
)
 
70

 
10

Net periodic pension and OPEB (income) expense
$
(613
)
 
$
91

 
$
117

 
$
(607
)
 
$
89

 
$
112



We made discretionary contributions to our U.S. hourly pension plan of $2.0 billion in the six months ended June 30, 2016. These discretionary contributions were funded with the net proceeds from the issuance of senior unsecured notes.