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Postretirement benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
At the date of the acquisition of Chubb Corp, we assumed the following postretirement benefit plan assets and obligations:
 
Pension Benefits
 
 
Other Postretirement Benefits
 
January 14, 2016
U.S. Plans

 
Non-U.S. Plans

 
Total

 
U.S. Plans

 
Non-U.S. Plans

 
Total

(in millions of U.S. dollars)
 
 
 
 
 
Fair value of plan assets
$
2,473

 
$
315

 
$
2,788

 
$
138

 
$
—

 
$
138

Benefit obligations
(3,153
)
 
(372
)
 
(3,525
)
 
(491
)
 
(15
)
 
(506
)
Funded status
$
(680
)
 
$
(57
)
 
$
(737
)
 
$
(353
)
 
$
(15
)
 
$
(368
)
Schedule of Net Benefit Costs [Table Text Block]
The following tables summarize the components of net periodic benefit costs for our pension and postretirement benefit plans recognized in the Consolidated statements of operations:
Three Months Ended September 30
Pension Benefits
 
 
Other Postretirement Benefits
 
(in millions of U.S. dollars)
U.S. Plans

 
Non-U.S. Plans

 
Total

 
U.S. Plans

 
Non-U.S. Plans

 
Total

2016
 
 
 
 
 
 
 
 
 
 
 
Net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
     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

2015
 
 
 
 
 
 
 
 
 
 
 
Net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
     Service cost
$
—

 
$
2

 
$
2

 
 
 
 
 
 
     Interest cost
—

 
5

 
5

 
 
 
 
 
 
     Expected return on plan assets
—

 
(7
)
 
(7
)
 
 
 
 
 
 
     Amortization of net actuarial loss
—

 
—

 
—

 
 
 
 
 
 
             Net periodic benefit cost
$
—

 
$
—

 
$
—

 
 
 
 
 
 
Nine Months Ended September 30
Pension Benefits
 
 
Other Postretirement Benefits
 
(in millions of U.S. dollars)
U.S. Plans

 
Non-U.S. Plans

 
Total

 
U.S. Plans

 
Non-U.S. Plans

 
Total

2016
 
 
 
 
 
 
 
 
 
 
 
Net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
     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 benefit cost
$
11

 
$
11

 
$
22

 
$
14

 
$
1

 
$
15

2015
 
 
 
 
 
 
 
 
 
 
 
Net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
     Service cost
$
—

 
$
5

 
$
5

 
 
 
 
 
 
     Interest cost
—

 
15

 
15

 
 
 
 
 
 
     Expected return on plan assets
—

 
(21
)
 
(21
)
 
 
 
 
 
 
     Amortization of net actuarial loss
—

 
2

 
2

 
 
 
 
 
 
             Net periodic benefit cost
$
—

 
$
1

 
$
1

 
 
 
 
 
 
Schedule of Assumptions Used [Table Text Block]
The weighted-average assumptions used to determine net pension and other postretirement benefit costs were as follows:
 
Pension Benefits
 
 
Other Postretirement Benefits
 
 
U.S. Plans

 
Non-U.S. Plans

 
U.S. Plans

 
Non-U.S. Plans

September 30, 2016
 
 
 
 
 
 
 
Discount rate
4.28
%
 
3.74
%
 
4.41
%
 
4.30
%
Rate of compensation increase
4.00
%
 
3.40
%
 
N/A

 
N/A

Expected long-term rate of return on plan assets
7.00
%
 
4.90
%
 
7.00
%
 
N/A

December 31, 2015

 

 

 

Discount rate
N/A

 
3.51
%
 
N/A

 
N/A

Rate of compensation increase
N/A

 
3.09
%
 
N/A

 
N/A

Expected long-term rate of return on plan assets
N/A

 
4.81
%
 
N/A

 
N/A