Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Disclosure - Segment Reporting [Abstract]

Segment Information
For the year ended December 31, 2011

					Global			Global						Total
		North			(Non-U.S.)			(Non-U.S.)						Non-life			Life		Corporate
		America			P&C			Specialty			Catastrophe			Segment			Segment		and Other		Total

Gross premiums written		$	1,104		$	682		$	1,446		$	599		$	3,831		$	790	$	12	$	4,633
Net premiums written		$	1,104		$	678		$	1,344		$	562		$	3,688		$	786	$	12	$	4,486
Decrease in unearned premiums			31			81			32			12			156			6		—		162
Net premiums earned		$	1,135		$	759		$	1,376		$	574		$	3,844		$	792	$	12	$	4,648
Losses and loss expenses and
life policy benefits			(741)			(567)			(950)			(1,459)			(3,717)			(650)		(6)		(4,373)
Acquisition costs			(276)			(191)			(328)			(26)			(821)			(117)		—		(938)
Technical result		$	118		$	1		$	98		$	(911)		$	(694)		$	25	$	6	$	(663)
Other income															4			1		3		8
Other operating expenses															(283)			(53)		(99)		(435)
Underwriting result														$	(973)		$	(27)		n/a	$	(1,090)
Net investment income																		66		563		629
Allocated underwriting result	⁽¹⁾																$	39		n/a		n/a
Net realized and unrealized investment gains																				67		67
Interest expense																				(49)		(49)
Amortization of intangible assets																				(36)		(36)
Net foreign exchange gains																				34		34
Income tax expense																				(69)		(69)
Interest in losses of equity investments																				(6)		(6)
Net loss																				n/a	$	(520)

Loss ratio ⁽²⁾			65.3	%		74.7	%		69.1	%		254.2	%		96.7	%
Acquisition ratio ⁽³⁾			24.3			25.1			23.8			4.5			21.3

Technical ratio ⁽⁴⁾			89.6	%		99.8	%		92.9	%		258.7	%		118.0	%
Other operating expense ratio ⁽⁵⁾															7.4

Combined ratio ⁽⁶⁾															125.4	%

Segment Information
For the year ended December 31, 2010

				Global			Global						Total
	North			(Non-U.S.)			(Non-U.S.)						Non-life			Life		Corporate
	America			P&C			Specialty			Catastrophe			Segment			Segment		and Other		Total

Gross premiums written	$	1,028		$	909		$	1,479		$	716		$	4,132		$	749	$	4	$	4,885
Net premiums written	$	1,026		$	898		$	1,391		$	646		$	3,961		$	742	$	2	$	4,705
Decrease in unearned premiums		12			16			14			26			68			2		1		71
Net premiums earned	$	1,038		$	914		$	1,405		$	672		$	4,029		$	744	$	3	$	4,776
Losses and loss expenses and
life policy benefits		(577)			(702)			(985)			(393)			(2,657)			(624)		(3)		(3,284)
Acquisition costs		(288)			(227)			(292)			(49)			(856)			(116)		—		(972)
Technical result	$	173		$	(15)		$	128		$	230		$	516		$	4	$	—	$	520
Other income														5			2		3		10
Other operating expenses														(317)			(57)		(166)		(540)
Underwriting result													$	204		$	(51)		n/a	$	(10)
Net investment income																	71		602		673
Allocated underwriting result																$	20		n/a		n/a
Net realized and unrealized investment gains																			402		402
Interest expense																			(44)		(44)
Amortization of intangible assets																			(31)		(31)
Net foreign exchange losses																			(21)		(21)
Income tax expense																			(129)		(129)
Interest in earnings of equity investments																			13		13
Net income																			n/a	$	853

Loss ratio		55.6	%		76.8	%		70.0	%		58.5	%		65.9	%
Acquisition ratio		27.8			24.9			20.8			7.2			21.3

Technical ratio		83.4	%		101.7	%		90.8	%		65.7	%		87.2	%
Other operating expense ratio														7.8

Combined ratio														95.0	%

Segment Information
For the year ended December 31, 2009

				Global			Global						Total
	North			(Non-U.S.)			(Non-U.S.)						Non-life			Life		Corporate
	America			P&C			Specialty			Catastrophe			Segment			Segment		and Other		Total

Gross premiums written	$	1,162		$	677		$	1,159		$	400		$	3,398		$	595	$	8	$	4,001
Net premiums written	$	1,162		$	679		$	1,113		$	397		$	3,351		$	591	$	7	$	3,949
Decrease (increase) in unearned premiums		48			50			3			73			174			(4)		1		171
Net premiums earned	$	1,210		$	729		$	1,116		$	470		$	3,525		$	587	$	8	$	4,120
Losses and loss expenses and
life policy benefits		(728)			(392)			(732)			(6)			(1,858)			(440)		2		(2,296)
Acquisition costs		(311)			(174)			(254)			(33)			(772)			(113)		—		(885)
Technical result	$	171		$	163		$	130		$	431		$	895		$	34	$	10	$	939
Other income														13			2		7		22
Other operating expenses														(253)			(47)		(131)		(431)
Underwriting result													$	655		$	(11)		n/a	$	530
Net investment income																	62		534		596
Allocated underwriting result																$	51		n/a		n/a
Net realized and unrealized investment gains																			591		591
Net realized gain on purchase of capital efficient notes																			89		89
Interest expense																			(28)		(28)
Amortization of intangible assets																			6		6
Net foreign exchange losses																			(1)		(1)
Income tax expense																			(262)		(262)
Interest in earnings of equity investments																			16		16
Net income																			n/a	$	1,537

Loss ratio		60.2	%		53.7	%		65.6	%		1.3	%		52.7	%
Acquisition ratio		25.7			23.8			22.7			7.0			21.9

Technical ratio		85.9	%		77.5	%		88.3	%		8.3	%		74.6	%
Other operating expense ratio														7.2

Combined ratio														81.8	%

Segment line of business distribution of premiums table

			2011		2010		2009

Non-life
	Property and casualty
		Casualty	11	%	11	%	13	%
		Property	15		18		18
		Motor	5		7		6
		Multiline and other	2		2		2
	Specialty
		Agriculture	7		4		8
		Aviation/Space	5		5		5
		Catastrophe	13		14		10
		Credit/Surety	7		6		6
		Energy	2		2		2
		Engineering	4		4		5
		Marine	6		6		5
		Specialty casualty	2		3		3
		Specialty property	3		2		2
Life			18		16		15

Total			100	%	100	%	100	%

Segment geographic distribution of premiums table

	2011		2010		2009

Europe	41	%	43	%	41	%
North America	36		36		41
Asia, Australia and New Zealand	12		10		8
Latin America, Caribbean and Africa	11		11		10

Total	100	%	100	%	100	%

Segment disclosure for major brokers

		2011		2010		2009

Non-life
	North America	64	%	77	%	78	%
	Global (Non-U.S.) P&C	29		32		25
	Global (Non-U.S.) Specialty	43		37		27
	Catastrophe	81		70		70
Life		16		15		18

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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