Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

The segment results for the years ended December 31, 2017, 2016 and 2015 are presented below (in millions of U.S. dollars, except ratios).

Segment Information

For the year ended December 31, 2017



	P&C segment			Specialty segment			Total Non-life			Life and Health segment			Corporate and Other			Total
Gross premiums written	$	2,255		$	1,934		$	4,189		$	1,399		$	—		$	5,588
Net premiums written	$	1,996		$	1,780		$	3,776		$	1,344		$	—		$	5,120
Increase in unearned premiums	(33		)	(55		)	(88		)	(7		)	—			(95		)
Net premiums earned	$	1,963		$	1,725		$	3,688		$	1,337		$	—		$	5,025
Losses and loss expenses	(1,620		)	(955		)	(2,575		)	(1,266		)	—			(3,841		)
Acquisition costs	(495		)	(489		)	(984		)	(136		)	—			(1,120		)
Technical result	$	(152	)	$	281		$	129		$	(65	)	$	—		$	64
Other (loss) income	—			(1		)	(1		)	14			2			15
Other expenses	(71		)	(33		)	(104		)	(61		)	(183		)	(348		)
Underwriting result	(223		)	247			$	24		$	(112	)	n/a			$	(269	)
Net investment income										60			342			402
Allocated underwriting result										$	(52	)	n/a			n/a
Net realized and unrealized investment gains													232			232
Interest expense													(42		)	(42		)
Loss on redemption of debt													(2		)	(2		)
Amortization of intangible assets													(25		)	(25		)
Net foreign exchange losses													(108		)	(108		)
Income tax expense													(10		)	(10		)
Interest in earnings of equity method investments													86			86
Net income													n/a			$	264
Loss ratio ⁽¹⁾	82.6		%	55.4		%	69.8		%
Acquisition ratio ⁽²⁾	25.2			28.4			26.7
Technical ratio ⁽³⁾	107.8		%	83.8		%	96.5		%
Other expense ratio ⁽⁴⁾	3.6		%	1.9		%	2.8
Combined ratio ⁽⁵⁾	111.4		%	85.7		%	99.3		%

(1) Loss ratio is obtained by dividing losses and loss expenses by net premiums earned.

(2) Acquisition ratio is obtained by dividing acquisition costs by net premiums earned.

(3) Technical ratio is defined as the sum of the loss ratio and the acquisition ratio.

(4) Other expense ratio is obtained by dividing other expenses by net premiums earned.

(5) Combined ratio is defined as the sum of the technical ratio and the other expense ratio.

n/a: Not applicable

Segment Information

For the year ended December 31, 2016



	P&C segment			Specialty segment			Total Non-life			Life and Health segment			Corporate and Other			Total
Gross premiums written	$	2,269		$	1,920		$	4,189		$	1,168		$	—		$	5,357
Net premiums written	$	2,061		$	1,776		$	3,837		$	1,117		$	—		$	4,954
Decrease (increase) in unearned premiums	25			(9		)	16			—			—			16
Net premiums earned	$	2,086		$	1,767		$	3,853		$	1,117		$	—		$	4,970
Losses and loss expenses	(1,248		)	(1,073		)	(2,321		)	(927		)	—			(3,248		)
Acquisition costs	(556		)	(500		)	(1,056		)	(131		)	—			(1,187		)
Technical result	$	282		$	194		$	476		$	59		$	—		$	535
Other income (loss)	3			(1		)	2			10			3			15
Other expenses	(141		)	(88		)	(229		)	(66		)	(177		)	(472		)
Underwriting result	144			105			$	249		$	3		n/a			$	78
Net investment income										58			353			411
Allocated underwriting result										$	61		n/a			n/a
Net realized and unrealized investment gains													26			26
Interest expense													(49		)	(49		)
Loss on redemption of debt													(22		)	(22		)
Amortization of intangible assets													(26		)	(26		)
Net foreign exchange gains													78			78
Income tax expense													(26		)	(26		)
Interest in losses of equity method investments													(23		)	(23		)
Net income													n/a			$	447
Loss ratio	59.8		%	60.8		%	60.3		%
Acquisition ratio	26.7			28.3			27.4
Technical ratio	86.5		%	89.1		%	87.7		%
Other expense ratio	6.7		%	4.9		%	5.9
Combined ratio	93.2		%	94.0		%	93.6		%

Segment Information

For the year ended December 31, 2015



	P&C segment			Specialty segment			Total Non-life			Life and Health segment			Corporate and Other			Total
Gross premiums written	$	2,371		$	1,906		$	4,277		$	1,271		$	—		$	5,548
Net premiums written	$	2,236		$	1,786		$	4,022		$	1,208		$	—		$	5,230
Decrease in unearned premiums	4			34			$	38		1			—			$	39
Net premiums earned	$	2,240		$	1,820		$	4,060		$	1,209		$	—		$	5,269
Losses and loss expenses	(1,129		)	(1,064		)	(2,193		)	(964		)	—			(3,157		)
Acquisition costs	(570		)	(494		)	(1,064		)	(153		)	—			(1,217		)
Technical result	$	541		$	262		$	803		$	92		$	—		$	895
Other income	—			—			—			6			3			9
Other expenses	(137		)	(82		)	(219		)	(63		)	(509		)	(791		)
Underwriting result	404			180			$	584		$	35		n/a			$	113
Net investment income										59			391			450
Allocated underwriting result										$	94		n/a			n/a
Net realized and unrealized investment losses													(297		)	(297		)
Interest expense													(49		)	(49		)
Amortization of intangible assets													(27		)	(27		)
Net foreign exchange losses													(9		)	(9		)
Income tax expense													(80		)	(80		)
Interest in earnings of equity method investments													6			6
Net income													n/a			$	107
Loss ratio	50.4		%	58.5		%	54.0		%
Acquisition ratio	25.4			27.1			26.2
Technical ratio	75.8		%	85.6		%	80.2		%
Other expense ratio	6.2		%	4.5		%	5.4
Combined ratio	82.0		%	90.1		%	85.6		%

Segment geographic distribution of premiums table

The following table provides the geographic distribution of gross premiums written based on the location of the underlying risk for the years ended December 31, 2017, 2016 and 2015:



	2017		2016		2015
Asia, Australia and New Zealand	13	%	12	%	12	%
Europe	34		36		37
Latin America, Caribbean and Africa	9		8		10
North America	44		44		41
Total	100	%	100	%	100	%

Percentage of premiums through brokers

The following table summarizes the percentage of gross premiums written through these two brokers by segment for the years ended December 31, 2017, 2016 and 2015:



	2017		2016		2015
P&C	57	%	57	%	54	%
Specialty	56	%	46	%	42	%
Life and Health	18	%	16	%	16	%