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Postretirement benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:
 
Three Months Ended September 30
 
 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
U.S. Plans

 
Non-U.S. Plans

 
Total

 
U.S. Plans

 
Non-U.S. Plans

 
Total

(in millions of U.S. dollars)
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
15

 
$
6

 
$
21

 
$
—

 
$
—

 
$
—

Interest cost
27

 
6

 
33

 
1

 
1

 
2

Expected return on plan assets
(47
)
 
(11
)
 
(58
)
 
(2
)
 
—

 
(2
)
Amortization of net actuarial loss
—

 
1

 
1

 
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
(22
)
 
—

 
(22
)
Curtailments
—

 
—

 
—

 
(32
)
 
—

 
(32
)
Net periodic (benefit) cost
$
(5
)
 
$
2

 
$
(3
)
 
$
(55
)
 
$
1

 
$
(54
)
2016
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
20

 
$
6

 
$
26

 
$
4

 
$
—

 
$
4

Interest cost
26

 
8

 
34

 
4

 
—

 
4

Expected return on plan assets
(42
)
 
(10
)
 
(52
)
 
(3
)
 
—

 
(3
)
Amortization of net actuarial loss
—

 
—

 
—

 
—

 
—

 
—

Curtailments
(4
)
 
—

 
(4
)
 
—

 
—

 
—

Settlements
(1
)
 
—

 
(1
)
 
—

 
—

 
—

Net periodic (benefit) cost
$
(1
)
 
$
4

 
$
3

 
$
5

 
$
—

 
$
5


 
Nine Months Ended September 30
 
 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
U.S. Plans

 
Non-U.S. Plans

 
Total

 
U.S. Plans

 
Non-U.S. Plans

 
Total

(in millions of U.S. dollars)
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
47

 
$
14

 
$
61

 
$
1

 
$
1

 
$
2

Interest cost
79

 
20

 
99

 
2

 
1

 
3

Expected return on plan assets
(142
)
 
(31
)
 
(173
)
 
(4
)
 
—

 
(4
)
Amortization of net actuarial loss
—

 
2

 
2

 
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
(68
)
 
—

 
(68
)
Curtailments
—

 
(8
)
 
(8
)
 
(32
)
 
—

 
(32
)
Net periodic (benefit) cost
$
(16
)
 
$
(3
)
 
$
(19
)
 
$
(101
)
 
$
2

 
$
(99
)
2016
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
57

 
$
15

 
$
72

 
$
8

 
$
1

 
$
9

Interest cost
80

 
24

 
104

 
13

 
—

 
13

Expected return on plan assets
(121
)
 
(30
)
 
(151
)
 
(7
)
 
—

 
(7
)
Amortization of net actuarial loss
—

 
2

 
2

 
—

 
—

 
—

Curtailments
(4
)
 
—

 
(4
)
 
—

 
—

 
—

Settlements
(1
)
 
—

 
(1
)
 
—

 
—

 
—

Net periodic cost
$
11

 
$
11

 
$
22

 
$
14

 
$
1

 
$
15