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Other (income) expense (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of the components of Other (income) expense
 
Year Ended December 31
 
(in millions of U.S. dollars)
2017

 
2016

 
2015

Equity in net (income) loss of partially-owned entities
$
(418
)
 
$
(264
)
 
$
(113
)
(Gains) losses from fair value changes in separate account assets (1)
(97
)
 
(11
)
 
19

One-time contribution to the Chubb Charitable Foundation
50

 
—

 
—

Federal excise and capital taxes
35

 
19

 
19

Other
30

 
34

 
24

Other (income) expense
$
(400
)
 
$
(222
)
 
$
(51
)

(1) Related to (gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP.