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Postretirement benefits
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans [Text Block]
Postretirement benefits

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:
 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
2018
 
 
2017
 
 
2018

 
2017

Three Months Ended June 30
U.S. Plans

 
Non-U.S. Plans

 
U.S. Plans

 
Non-U.S. Plans

 
 
 
 
(in millions of U.S. dollars)
 
 
 
 
Service cost
$
15

 
$
3

 
$
16

 
$
4

 
$
—

 
$
2

Interest cost
27

 
7

 
26

 
7

 
1

 
—

Expected return on plan assets
(53
)
 
(13
)
 
(48
)
 
(10
)
 
(1
)
 
(1
)
Amortization of net actuarial loss
—

 
—

 
—

 
1

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
(22
)
 
(23
)
Curtailments
—

 
—

 
—

 
(8
)
 
(1
)
 
—

Settlements
1

 
—

 
—

 
—

 
—

 
—

Net periodic (benefit) cost
$
(10
)
 
$
(3
)
 
$
(6
)
 
$
(6
)
 
$
(23
)
 
$
(22
)


 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
2018
 
 
2017
 
 
2018

 
2017

Six Months Ended June 30
U.S. Plans

 
Non-U.S. Plans

 
U.S. Plans

 
Non-U.S. Plans

 
 
 
 
(in millions of U.S. dollars)
 
 
 
 
Service cost
$
29

 
$
6

 
$
32

 
$
8

 
$
—

 
$
2

Interest cost
53

 
14

 
52

 
14

 
2

 
1

Expected return on plan assets
(106
)
 
(26
)
 
(95
)
 
(20
)
 
(2
)
 
(2
)
Amortization of net actuarial loss
—

 
—

 
—

 
1

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
(43
)
 
(46
)
Curtailments
—

 
—

 
—

 
(8
)
 
(1
)
 
—

Settlements
1

 
—

 
—

 
—

 
—

 
—

Net periodic (benefit) cost
$
(23
)
 
$
(6
)
 
$
(11
)
 
$
(5
)
 
$
(44
)
 
$
(45
)