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Pensions and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits
Pensions and Other Postretirement Benefits

Three Months Ended March 31, 2018

Three Months Ended March 31, 2017

Pension Benefits

Global OPEB Plans

Pension Benefits

Global OPEB Plans

U.S.

Non-U.S.


U.S.

Non-U.S.

Service cost
$
83


$
66


$
5


$
79


$
46


$
4

Interest cost
513


120


50


536


125


49

Expected return on plan assets
(973
)

(212
)

—


(919
)

(171
)

—

Amortization of prior service cost (credit)
(1
)

1


(4
)

(1
)

1


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


37


13


(1
)

47


8

Net periodic pension and OPEB (income) expense
$
(376
)

$
12


$
64


$
(306
)

$
48


$
58



The non-service cost components of the net periodic pension and OPEB income of $421 million and $329 million in the three months ended March 31, 2018 and 2017 are presented in Interest income and other non-operating income, net. We elected to use the 2017 amounts disclosed above as the practical expedient for determining the retrospective presentation. Refer to Note 1 for additional details on the adoption of ASU 2017-07.

We expect to contribute approximately $1.2 billion to our non-U.S. pension plans in 2018, inclusive of the Korea payment of pension obligations for separated employees. Refer to Note 16 for additional information.