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Pensions and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits
Pensions and Other Postretirement Benefits

Three Months Ended September 30, 2018

Three Months Ended September 30, 2017

Pension Benefits
 
Global OPEB Plans
 
Pension Benefits
 
Global OPEB Plans

U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
83


$
33


$
5


$
79


$
45


$
4

Interest cost
513


112


49


536


115


51

Expected return on plan assets
(972
)

(201
)

—


(919
)

(185
)

—

Amortization of prior service cost (credit)
(1
)

1


(4
)

(1
)

2


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


35


14


(2
)

29


8

Curtailments, settlements and other
—


18


—


—


—


—

Net periodic pension and OPEB (income) expense
$
(375
)
 
$
(2
)
 
$
64

 
$
(307
)
 
$
6


$
60



 
Nine Months Ended September 30, 2018
 
Nine Months Ended September 30, 2017
 
Pension Benefits
 
Global OPEB Plans
 
Pension Benefits
 
Global OPEB Plans
 
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
248


$
138


$
15


$
237


$
131


$
14

Interest cost
1,538


349


147


1,608


366


149

Expected return on plan assets
(2,917
)

(621
)

—


(2,757
)

(528
)

—

Amortization of prior service cost (credit)
(3
)

3


(11
)

(3
)

4


(10
)
Amortization of net actuarial (gains) losses
7


109


40


(5
)

124


24

Curtailments, settlements and other
—


18


—


—


—


—

Net periodic pension and OPEB (income) expense
$
(1,127
)
 
$
(4
)
 
$
191

 
$
(920
)
 
$
97

 
$
177



The non-service cost components of the net periodic pension and OPEB income of $401 million and $369 million in the three months ended September 30, 2018 and 2017 and $1.2 billion and $1.0 billion in the nine months ended September 30, 2018 and 2017 are presented in Interest income and other non-operating income, net. We used the practical expedient for retrospective presentation of the 2017 non-service cost components in this disclosure. Refer to Note 1 for additional details on the adoption of ASU 2017-07.

We expect to contribute approximately $1.6 billion to our non-U.S. pension plans in 2018, inclusive of $584 million in contributions to pre-fund U.K. and Canada pension plans in the three months ended September 30, 2018 and approximately $300 million in payments of pension obligations for separated employees in Korea. Refer to Note 16 for additional information on the Korea payments.