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Postretirement benefits
 9 Months Ended
Sep. 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 September 30
U.S. Plans

 
Non-U.S. Plans

 
U.S. Plans

 
Non-U.S. Plans

 
 
 
 
(in millions of U.S. dollars)
 
 
 
 
Service cost
$
14

 
$
3

 
$
15

 
$
6

 
$
1

 
$
—

Interest cost
26

 
6

 
27

 
6

 
1

 
2

Expected return on plan assets
(53
)
 
(12
)
 
(47
)
 
(11
)
 
(2
)
 
(2
)
Amortization of net actuarial loss
—

 
1

 
—

 
1

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
(21
)
 
(22
)
Curtailments
—

 
—

 
—

 
—

 
(1
)
 
(32
)
Settlements
—

 
—

 
—

 
—

 
—

 
—

Net periodic (benefit) cost
$
(13
)
 
$
(2
)
 
$
(5
)
 
$
2

 
$
(22
)
 
$
(54
)


 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
2018
 
 
2017
 
 
2018

 
2017

Nine Months Ended September 30
U.S. Plans

 
Non-U.S. Plans

 
U.S. Plans

 
Non-U.S. Plans

 
 
 
 
(in millions of U.S. dollars)
 
 
 
 
Service cost
$
43

 
$
9

 
$
47

 
$
14

 
$
1

 
$
2

Interest cost
79

 
20

 
79

 
20

 
3

 
3

Expected return on plan assets
(159
)
 
(38
)
 
(142
)
 
(31
)
 
(4
)
 
(4
)
Amortization of net actuarial loss
—

 
1

 
—

 
2

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
(64
)
 
(68
)
Curtailments
—

 
—

 
—

 
(8
)
 
(2
)
 
(32
)
Settlements
1

 
—

 
—

 
—

 
—

 
—

Net periodic (benefit) cost
$
(36
)
 
$
(8
)
 
$
(16
)
 
$
(3
)
 
$
(66
)
 
$
(99
)

The non-service cost components of net periodic (benefit) cost are included in Losses and loss expenses and Administrative expenses in the Consolidated statements of operations.