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Pensions and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pensions and Other Postretirement Benefits
Pensions and Other Postretirement Benefits
 
Three Months Ended March 31, 2017
 
Three Months Ended March 31, 2016
 
Pension Benefits
 
Global OPEB Plans
 
Pension Benefits
 
Global OPEB Plans
 
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
79

 
$
95

 
$
4

 
$
95

 
$
85

 
$
5

Interest cost
536

 
127

 
49

 
553

 
144

 
50

Expected return on plan assets
(919
)
 
(183
)
 
—

 
(945
)
 
(182
)
 
—

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

 
(3
)
 
(1
)
 
3

 
(4
)
Amortization of net actuarial (gains) losses
(1
)
 
62

 
8

 
(6
)
 
47

 
5

Net periodic pension and OPEB (income) expense
$
(306
)
 
$
102

 
$
58

 
$
(304
)
 
$
97

 
$
56



We made discretionary contributions to our U.S. hourly pension plan of $1.5 billion in the three months ended March 31, 2016 and $482 million in April 2016. These discretionary contributions were funded with the net proceeds from the issuance of senior unsecured notes.