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Condensed Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
 
Three Months Ended
 
 
March 31

 
June 30

 
September 30

 
December 31

(in millions of U.S. dollars, except per share data)
2012

 
2012

 
2012

 
2012

Net premiums earned
$
3,381

 
$
3,783

 
$
4,665

 
$
3,848

Net investment income
544

 
537

 
533

 
567

Net realized gains (losses) including OTTI
260

 
(394
)
 
(60
)
 
272

Total revenues
$
4,185

 
$
3,926

 
$
5,138

 
$
4,687

Losses and loss expenses
$
1,804

 
$
2,119

 
$
3,047

 
$
2,683

Policy benefits
$
147

 
$
102

 
$
130

 
$
142

Net income
$
973

 
$
328

 
$
640

 
$
765

Basic earnings per share
$
2.87

 
$
0.96

 
$
1.88

 
$
2.24

Diluted earnings per share
$
2.84

 
$
0.96

 
$
1.86

 
$
2.22

 
Three Months Ended
 
 
March 31

 
June 30

 
September 30

 
December 31

(in millions of U.S. dollars, except per share data)
2011

 
2011

 
2011

 
2011

Net premiums earned
$
3,309

 
$
3,757

 
$
4,490

 
$
3,831

Net investment income
544

 
569

 
564

 
565

Net realized gains (losses) including OTTI
(45
)
 
(73
)
 
(760
)
 
83

Total revenues
$
3,808

 
$
4,253

 
$
4,294

 
$
4,479

Losses and loss expenses
$
2,263

 
$
2,226

 
$
2,745

 
$
2,286

Policy benefits
$
91

 
$
108

 
$
83

 
$
119

Net income (loss)
$
250

 
$
594

 
$
(39
)
 
$
735

Basic earnings per share
$
0.74

 
$
1.75

 
$
(0.11
)
 
$
2.17

Diluted earnings per share
$
0.73

 
$
1.74

 
$
(0.11
)
 
$
2.15