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Condensed Unaudited Quarterly Financial Data
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Condensed unaudited quarterly financial data
Condensed unaudited quarterly financial data
 
Three Months Ended
 
 
March 31

 
June 30

 
September 30

 
December 31

(in millions of U.S. dollars, except per share data)
2015

 
2015

 
2015

 
2015

Net premiums earned
$
3,927

 
$
4,360

 
$
4,719

 
$
4,207

Net investment income
551

 
562

 
549

 
532

Net realized gains (losses) including OTTI
(89
)
 
126

 
(397
)
 
(60
)
Total revenues
$
4,389

 
$
5,048

 
$
4,871

 
$
4,679

Losses and loss expenses
$
2,122

 
$
2,417

 
$
2,643

 
$
2,302

Policy benefits
$
142

 
$
153

 
$
89

 
$
159

Net income
$
681

 
$
942

 
$
528

 
$
683

Basic earnings per share
$
2.08

 
$
2.89

 
$
1.63

 
$
2.10

Diluted earnings per share
$
2.05

 
$
2.86

 
$
1.62

 
$
2.08




 
Three Months Ended
 
 
March 31

 
June 30

 
September 30

 
December 31

(in millions of U.S. dollars, except per share data)
2014

 
2014

 
2014

 
2014

Net premiums earned
$
3,970

 
$
4,332

 
$
4,754

 
$
4,370

Net investment income
553

 
556

 
566

 
577

Net realized gains (losses) including OTTI
(104
)
 
(73
)
 
(120
)
 
(210
)
Total revenues
$
4,419

 
$
4,815

 
$
5,200

 
$
4,737

Losses and loss expenses
$
2,161

 
$
2,388

 
$
2,684

 
$
2,416

Policy benefits
$
114

 
$
144

 
$
125

 
$
134

Net income (1)
$
734

 
$
779

 
$
785

 
$
555

Basic earnings per share
$
2.16

 
$
2.30

 
$
2.35

 
$
1.68

Diluted earnings per share
$
2.14

 
$
2.28

 
$
2.32

 
$
1.66



(1) Net income for the three months ended December 31, 2014 includes $89 million of net charges related to income taxes to correct prior periods. Such amounts are not material to any period presented.