Condensed Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2019

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)	2019			2019			2019			2019
Net premiums earned	$	7,137		$	7,891		$	8,327		$	7,935
Net investment income	836			859			873			858
Net realized gains (losses) including OTTI losses	(97		)	(223		)	(155		)	(55		)
Total revenues	$	7,876		$	8,527		$	9,045		$	8,738
Losses and loss expenses	$	4,098		$	4,715		$	5,052		$	4,865
Policy benefits	$	196		$	161		$	158		$	225
Net income	$	1,040		$	1,150		$	1,091		$	1,173
Basic earnings per share	$	2.27		$	2.52		$	2.40		$	2.59
Diluted earnings per share	$	2.25		$	2.50		$	2.38		$	2.57

	Three Months Ended
	March 31			June 30		September 30		December 31
(in millions of U.S. dollars, except per share data)	2018			2018		2018		2018
Net premiums earned	$	7,027		$	7,664	$	7,908	$	7,465
Net investment income	806			828		823		848
Net realized gains (losses) including OTTI losses	(2		)	18		19		(687		)
Total revenues	$	7,831		$	8,510	$	8,750	$	7,626
Losses and loss expenses	$	4,102		$	4,487	$	4,868	$	4,610
Policy benefits	$	151		$	150	$	127	$	162
Net income	$	1,082		$	1,294	$	1,231	$	355
Basic earnings per share	$	2.32		$	2.78	$	2.66	$	0.77
Diluted earnings per share	$	2.30		$	2.76	$	2.64	$	0.76