Condensed Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2014

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)	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.

	Three Months Ended
	March 31		June 30		September 30		December 31
(in millions of U.S. dollars, except per share data)	2013		2013		2013		2013
Net premiums earned	$	3,573	$	4,067	$	4,610	$	4,363
Net investment income	531		534		522		557
Net realized gains (losses) including OTTI	206		104		40		154
Total revenues	$	4,310	$	4,705	$	5,172	$	5,074
Losses and loss expenses	$	1,926	$	2,250	$	2,655	$	2,517
Policy benefits	$	131	$	110	$	138	$	136
Net income	$	953	$	891	$	916	$	998
Basic earnings per share	$	2.80	$	2.61	$	2.68	$	2.93
Diluted earnings per share	$	2.77	$	2.59	$	2.66	$	2.90