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Unpaid losses and loss expenses (Tables)

12 Months Ended

Dec. 31, 2016

Liability for Claims and Claims Adjustment Expense [Abstract]

Claims Development tables [Table Text Block]

North America Commercial P&C Insurance — Liability

This line consists of primary and excess liability exposures, including medical liability, and professional lines, including directors and officers (D&O) liability, errors and omissions (E&O) liability, employment practices liability (EPL), and fiduciary liability.

The primary and excess liability business represents the largest part of these exposures. The former includes both monoline and commercial package liability. The latter includes a substantial proportion of commercial umbrella, excess and high excess business, where loss activity can produce significant volatility in the loss triangles at later ages within an accident year (and sometimes across years) due to the size of the limits afforded and the complex nature of the underlying losses.

This line also includes management and professional liability products provided to a wide variety of clients, from national accounts to small firms to private and not-for-profit organizations, distributed through brokers, agents, wholesalers and MGAs. Many of these coverages, particularly D&O and E&O, are typically written on a claims-made form. While most of the coverages are underwritten on a primary basis, there are significant amounts of large line and excess exposure as well.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	3,682	$	3,760		$	3,719	$	3,755	$	3,692	$	3,447	$	3,318	$	3,300	$	3,253	$	3,105	$	249
2008			3,716			3,719		3,708		3,682		3,551		3,290		3,217		3,142		3,036		335
2009						3,682		3,630		3,599		3,556		3,454		3,205		3,130		3,060		447
2010								3,507		3,468		3,495		3,474		3,334		3,169		3,045		559
2011										3,437		3,498		3,525		3,539		3,472		3,360		856
2012												3,489		3,529		3,519		3,480		3,441		1,168
2013														3,490		3,479		3,481		3,477		1,588
2014																3,460		3,501		3,585		1,969
2015																		3,502		3,668		2,639
2016																				3,474		3,082
Total																				$	33,251



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	76	$	447		$	922	$	1,488	$	1,980	$	2,301	$	2,497	$	2,618	$	2,700	$	2,757	21
2008			115			471		987		1,500		1,837		2,169		2,394		2,496		2,591		21
2009						86		425		979		1,460		1,813		2,118		2,307		2,461		21
2010								97		501		981		1,421		1,757		2,125		2,294		20
2011										111		538		1,069		1,638		2,045		2,310		21
2012												114		532		1,028		1,535		1,953		21
2013														101		468		1,089		1,489		22
2014																116		576		1,124		23
2015																		117		544		26
2016																				142		19
Total																				$	17,665



North America Commercial P&C Insurance — Liability (continued)
Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	1,726
All Accident years	$	17,312

North America Commercial P&C Insurance — Non-Casualty

This product line represents first party commercial product lines that are short-tailed in nature, such as property, inland marine, A&H, and surety/fidelity bonds. There is a wide diversity of products, primary and excess coverages, and policy sizes. During this ten-year period, this product line was also impacted by natural catastrophes in the same years as outlined above in Other Casualty.



North America Commercial P&C Insurance — Non-Casualty (continued)
Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	1,271	$	1,190		$	1,181	$	1,168	$	1,151	$	1,137	$	1,138	$	1,139	$	1,138	$	1,139	$	—
2008			1,927			1,880		1,852		1,836		1,845		1,849		1,859		1,846		1,845		29
2009						1,366		1,395		1,367		1,357		1,356		1,353		1,355		1,369		28
2010								1,509		1,568		1,486		1,442		1,432		1,424		1,420		15
2011										1,985		1,957		1,922		1,916		1,895		1,915		43
2012												2,069		1,971		1,938		1,909		1,901		53
2013														1,487		1,446		1,359		1,383		73
2014																1,755		1,755		1,681		103
2015																		1,839		1,828		281
2016																				2,012		828
Total																				$	16,493



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	563	$	987		$	1,076	$	1,117	$	1,124	$	1,126	$	1,130	$	1,133	$	1,134	$	1,135	906
2008			929			1,607		1,708		1,766		1,797		1,800		1,807		1,813		1,813		995
2009						630		1,118		1,213		1,268		1,280		1,322		1,332		1,335		1,067
2010								703		1,231		1,335		1,374		1,394		1,400		1,401		1,054
2011										942		1,585		1,742		1,822		1,832		1,856		1,045
2012												727		1,612		1,745		1,810		1,830		1,027
2013														630		1,119		1,241		1,291		1,068
2014																833		1,405		1,539		1,095
2015																		712		1,334		1,164
2016																				852		1,098
Total																				$	14,386



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	143
All Accident years	$	2,250

North America Personal P&C Insurance

Chubb provides personal lines coverages for high-net-worth individuals and families in North America including homeowners, automobile, valuable articles (including fine art), umbrella liability, and recreational marine insurance offered through independent regional agents and brokers. A portfolio acquired from Fireman’s Fund is presented on a prospective basis beginning in May of accident year 2015. Reserves associated with prior accident periods were acquired through a loss portfolio transfer, which does not allow for a retrospective presentation.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	1,549	$	1,538		$	1,460	$	1,431	$	1,416	$	1,411	$	1,402	$	1,400	$	1,398	$	1,398	$	6
2008			1,777			1,777		1,746		1,722		1,693		1,675		1,667		1,659		1,659		6
2009						1,608		1,595		1,565		1,551		1,543		1,536		1,536		1,532		9
2010								1,868		1,876		1,853		1,836		1,832		1,828		1,823		11
2011										2,205		2,207		2,183		2,171		2,162		2,158		17
2012												2,183		2,181		2,181		2,189		2,183		25
2013														1,855		1,883		1,891		1,894		29
2014																2,202		2,203		2,189		141
2015																		2,491		2,546		213
2016																				2,437		609
Total																				$	19,819



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	843	$	1,182		$	1,267	$	1,328	$	1,353	$	1,370	$	1,377	$	1,384	$	1,387	$	1,387	127
2008			974			1,406		1,518		1,584		1,620		1,636		1,642		1,644		1,648		139
2009						886		1,234		1,345		1,437		1,484		1,501		1,511		1,519		125
2010								1,152		1,521		1,669		1,727		1,770		1,792		1,803		149
2011										1,358		1,833		1,969		2,049		2,103		2,127		168
2012												1,175		1,804		1,955		2,061		2,115		173
2013														1,040		1,500		1,683		1,782		126
2014																1,308		1,762		1,923		134
2015																		1,497		2,081		137
2016																				1,452		120
Total																				$	17,837



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	39
All Accident years	$	2,021

North America Commercial P&C Insurance — Other Casualty

This product line consists of the remaining commercial casualty coverages such as automobile liability, marine, and aviation. There is also a small portion of commercial multi-peril (CMP) business in accident years 2014 and prior. The paid and reported data are impacted by some catastrophe loss activity primarily on the CMP exposures just noted and, to a lesser extent, marine exposures. The ultimate loss experience for years ended December 31, 2008, 2011, and 2012 were impacted by natural catastrophes.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	726	$	682		$	659	$	630	$	611	$	611	$	599	$	591	$	597	$	596	$	24
2008			903			942		910		879		856		856		849		853		847		18
2009						718		710		665		640		593		557		548		546		16
2010								737		736		727		668		639		606		608		27
2011										696		717		703		675		659		651		40
2012												748		714		682		668		633		60
2013														619		640		632		621		121
2014																655		658		651		176
2015																		538		525		211
2016																				563		408
Total																				$	6,241



North America Commercial P&C Insurance — Other Casualty (continued)
Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	112	$	274		$	379	$	452	$	489	$	527	$	540	$	547	$	558	$	564	24
2008			210			464		604		690		748		777		798		807		815		25
2009						106		281		378		432		471		500		511		520		20
2010								144		334		430		481		517		560		571		21
2011										131		335		455		522		561		585		23
2012												108		307		413		484		538		24
2013														115		292		372		452		21
2014																113		289		387		22
2015																		80		205		20
2016																				74		17
Total																				$	4,711



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	241
All Accident years	$	1,771

North America Commercial P&C Insurance — Workers' Compensation

This product line has a substantial geographic spread and a broad mix across industries. Types of coverage include risk management business predominantly with high deductible policies, loss sensitive business (i.e., retrospectively-rated policies), business fronted for captives, as well as primary guaranteed cost coverages.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	1,068	$	1,042		$	1,026	$	1,018	$	976	$	943	$	944	$	934	$	933	$	913	$	171
2008			1,018			993		997		991		966		952		952		948		932		185
2009						960		933		933		928		908		902		889		877		220
2010								985		988		1,003		1,008		1,004		994		972		254
2011										957		963		978		982		984		954		276
2012												956		940		957		967		932		321
2013														1,013		1,031		1,043		1,047		374
2014																1,106		1,111		1,129		526
2015																		1,179		1,157		588
2016																				1,259		905
Total																				$	10,172



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	121	$	281		$	386	$	451	$	502	$	550	$	580	$	606	$	625	$	641	351
2008			125			276		370		436		500		542		574		602		627		333
2009						108		260		347		412		463		506		535		559		283
2010								125		303		414		495		548		587		612		304
2011										119		294		410		480		529		560		287
2012												111		272		365		435		483		288
2013														107		286		415		499		301
2014																113		296		408		338
2015																		117		302		338
2016																				123		275
Total																				$	4,814



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	2,226
All Accident years	$	7,584



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	12	%	17	%	11	%	8	%	6	%	4	%	3	%	3	%	2	%	2	%

Global Reinsurance — Property

This portfolio consists of property catastrophe, property proportional, and property per risk books, with U.S. exposure representing approximately 70 percent of the business within this segment. Although the mixture of business varies by year, property catastrophe represents approximately 70 percent in Treaty Years 2007 and after. Of the non-catastrophe book, approximately 75 percent is on proportional treaties in Treaty Year 2007 and after. This percentage has increased over time with the proportion being approximately 50 percent from 2007 growing to approximately 90 percent in Treaty Year 2015, with the remainder being written on an excess of loss basis. Also note, this product line is impacted by natural catastrophes, particularly in the 2011 and 2012 years.



Global Reinsurance — Property (continued)
Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	107	$	106		$	97	$	91	$	90	$	88	$	87	$	87	$	87	$	86	$	2
2008			223			214		206		206		206		208		210		209		208		—
2009						99		113		105		105		103		100		100		100		—
2010								155		179		173		172		178		179		180		6
2011										227		224		224		220		221		222		1
2012												175		154		149		142		141		4
2013														117		117		109		105		(2		)
2014																125		142		142		6
2015																		98		105		9
2016																				143		29
Total																				$	1,432



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	23	$	65		$	77	$	81	$	84	$	85	$	85	$	86	$	86	$	86	0.215
2008			65			139		169		194		205		207		208		208		208		0.157
2009						41		79		90		95		96		98		98		98		0.107
2010								40		137		157		167		171		173		173		0.095
2011										75		151		175		198		214		217		0.103
2012												29		95		117		125		129		0.084
2013														38		85		98		103		0.097
2014																56		112		127		0.081
2015																		50		87		0.086
2016																				50		0.087
Total																				$	1,278



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	—
All Accident years	$	154

Overseas General Insurance — Non-Casualty

This product line comprises commercial fire, marine (predominantly cargo), personal automobile (in Latin America, Asia Pacific and Japan), personal cell phones, personal residential (including high net worth), energy and construction. Latin America and Europe each make up about 35 percent of the Chubb International non-casualty book. In general, these lines have relatively stable payment and reporting patterns although they are impacted by natural catastrophes particularly in the 2008, 2010 and 2011 years.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	1,224	$	1,214		$	1,209	$	1,191	$	1,189	$	1,165	$	1,181	$	1,178	$	1,177	$	1,184	$	5
2008			1,364			1,360		1,318		1,294		1,302		1,287		1,284		1,280		1,269		14
2009						1,315		1,288		1,203		1,176		1,160		1,143		1,143		1,137		8
2010								1,434		1,449		1,424		1,424		1,413		1,400		1,392		30
2011										1,665		1,728		1,677		1,644		1,631		1,620		1
2012												1,472		1,473		1,442		1,401		1,400		43
2013														1,530		1,521		1,474		1,436		59
2014																1,601		1,664		1,622		63
2015																		1,705		1,812		192
2016																				1,685		424
Total																				$	14,557



Overseas General Insurance — Non-Casualty (continued)
Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	426	$	861		$	1,032	$	1,091	$	1,124	$	1,140	$	1,147	$	1,152	$	1,159	$	1,164	183
2008			479			985		1,120		1,183		1,206		1,215		1,225		1,233		1,233		206
2009						449		882		1,010		1,073		1,096		1,106		1,113		1,116		234
2010								523		1,028		1,218		1,278		1,316		1,328		1,334		252
2011										631		1,272		1,465		1,519		1,549		1,563		268
2012												553		1,050		1,233		1,290		1,311		283
2013														569		1,088		1,272		1,301		281
2014																622		1,209		1,394		269
2015																		692		1,315		256
2016																				789		191
Total																				$	12,520



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	65
All Accident years	$	2,102



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	39	%	37	%	12	%	4	%	2	%	1	%	1	%	—	%	—	%	—	%

Overseas General Insurance — Casualty

This product line is comprised of D&O liability, E&O liability, financial institutions (including crime/fidelity coverages), and non-U.S. general liability as well as shorter-tailed casualty exposures such as aviation, surety, and political risk. Exposures are located around the world, including Europe, Latin America, and Asia. There is some U.S. exposure in Casualty from multinational accounts. The financial lines coverages are typically written on a claims-made form, while general liability coverages are typically on an occurrence basis and a mix of primary and excess business.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	1,136	$	1,174		$	1,180	$	1,163	$	1,080	$	1,021	$	932	$	888	$	867	$	848	$	21
2008			1,189			1,301		1,386		1,389		1,398		1,360		1,290		1,273		1,267		105
2009						1,214		1,357		1,400		1,414		1,411		1,300		1,195		1,191		124
2010								1,170		1,203		1,280		1,349		1,284		1,239		1,118		162
2011										1,239		1,232		1,222		1,217		1,140		1,062		240
2012												1,253		1,196		1,257		1,278		1,269		373
2013														1,229		1,219		1,231		1,274		537
2014																1,242		1,286		1,285		626
2015																		1,186		1,252		719
2016																				1,181		914
Total																				$	11,747



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	95	$	287		$	425	$	550	$	631	$	680	$	715	$	743	$	776	$	787	37
2008			120			295		455		618		759		859		931		986		1,036		37
2009						119		330		505		642		734		791		860		950		36
2010								106		266		461		602		707		794		843		38
2011										88		240		382		511		610		686		39
2012												74		243		422		569		677		40
2013														87		260		413		555		41
2014																114		289		459		41
2015																		93		283		41
2016																				129		29
Total																				$	6,405



Overseas General Insurance — Casualty (continued)
Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	339
All Accident years	$	5,681

Global Reinsurance — Non-Property

This product line includes proportional and excess casualty coverages with exposures located around the world. Reinsurance in general exhibits less stable development patterns than primary business. In particular U.S. casualty reinsurance is long-tailed and can be very volatile.



Net Incurred Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Net IBNR Reserves
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	655	$	670		$	670	$	641	$	620	$	606	$	581	$	570	$	564	$	558	$	70
2008			488			512		528		513		503		480		480		475		474		55
2009						356		404		404		409		401		383		365		354		35
2010								442		472		479		485		472		467		457		84
2011										449		461		474		472		467		458		67
2012												440		437		440		440		425		30
2013														359		363		362		361		54
2014																367		367		373		69
2015																		328		333		87
2016																				256		141
Total																				$	4,049



Net Cumulative Paid Loss and Allocated Loss Adjustment Expenses
	Years Ended December 31																					December 31 2016
(in millions of U.S. dollars)					Unaudited																	Reported Claims (in thousands)
Accident Year	2007		2008			2009		2010		2011		2012		2013		2014		2015		2016		2016
2007	$	52	$	122		$	200	$	267	$	318	$	363	$	393	$	417	$	437	$	445	1.470
2008			46			113		187		239		286		319		343		362		373		1.292
2009						49		109		151		191		224		246		265		278		0.921
2010								71		149		209		253		283		315		331		0.877
2011										80		171		227		270		304		330		0.796
2012												93		202		260		301		334		0.677
2013														72		158		206		247		0.417
2014																99		199		240		0.428
2015																		95		173		0.370
2016																				63		0.118
Total																				$	2,814



Net Liabilities for Loss and Allocated Loss Adjustment Expenses
(in millions of U.S. dollars)	December 31, 2016
Accident years prior to 2007	$	357
All Accident years	$	1,592

Schedule of Historical Claims [Table Text Block]



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	46	%	37	%	7	%	4	%	1	%	1	%	—	%	—	%	—	%	—	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	39	%	37	%	12	%	4	%	2	%	1	%	1	%	—	%	—	%	—	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	3	%	12	%	16	%	15	%	12	%	10	%	6	%	4	%	3	%	2	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	19	%	29	%	16	%	11	%	7	%	5	%	2	%	1	%	1	%	1	%



North America Personal P&C Insurance (continued)
Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	59	%	24	%	7	%	4	%	2	%	1	%	1	%	—	%	—	%	—	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	33	%	41	%	12	%	8	%	4	%	1	%	—	%	—	%	—	%	—	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	9	%	15	%	14	%	12	%	9	%	7	%	5	%	5	%	4	%	1	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	12	%	17	%	11	%	8	%	6	%	4	%	3	%	3	%	2	%	2	%



Supplementary Information: Average Annual Percentage Payout of Net Incurred Claims by Age, as of December 31, 2016
Age in Years	1		2		3		4		5		6		7		8		9		10
Percentage	18	%	19	%	13	%	11	%	8	%	7	%	5	%	4	%	3	%	2	%

Reconciliation of Claims Development to Liability [Table Text Block]

The following table presents a reconciliation of the loss development tables above to the gross loss reserve liability in the consolidated balance sheet:



Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Expenses
(in millions of U.S. dollars)	December 31, 2016
Net unpaid loss and allocated loss adjustment expense:
North America Commercial P&C Insurance — Workers' Compensation	$	7,584
North America Commercial P&C Insurance — Liability	17,312
North America Commercial P&C Insurance — Other Casualty	1,771
North America Commercial P&C Insurance — Non-Casualty	2,250
North America Personal P&C Insurance	2,021
Overseas General Insurance — Casualty	5,681
Overseas General Insurance — Non-Casualty	2,102
Global Reinsurance — Property	154
Global Reinsurance — Non-Property	1,592
Other ⁽¹⁾	4,837
Net unpaid loss and allocated loss adjustment expense	45,304
Ceded unpaid loss and allocated loss adjustment expense:
North America Commercial P&C Insurance — Workers' Compensation	$	1,872
North America Commercial P&C Insurance — Liability	4,273
North America Commercial P&C Insurance — Other Casualty	437
North America Commercial P&C Insurance — Non-Casualty	555
North America Personal P&C Insurance	168
Overseas General Insurance — Casualty	2,617
Overseas General Insurance — Non-Casualty	968
Global Reinsurance — Property	11
Global Reinsurance — Non-Property	114
Other ⁽¹⁾	1,825
Ceded unpaid loss and allocated loss adjustment expense	12,840
Net unpaid loss and loss expense on other than short-duration contracts ⁽²⁾	741
Unpaid unallocated loss adjustment expenses	1,655
Unpaid losses and loss expenses	$	60,540

⁽¹⁾ Other includes the North America Agricultural Insurance segment, run-off asbestos and environmental, the loss portfolio transfer of Fireman’s Fund personal lines run-off liabilities, and Alternative Risk Solutions. Excludes the Life Insurance segment reserves.

⁽²⁾ Primarily includes our international A&H business and Life Insurance segment reserves.

Schedule Of Unpaid Losses And Loss Expenses Roll Forward

The following table presents a reconciliation of Unpaid losses and loss expenses:



		Year Ended December 31
(in millions of U.S. dollars)	2016				2015				2014
Gross unpaid losses and loss expenses, beginning of year		$	37,303			$	38,315			$	37,443
Reinsurance recoverable on unpaid losses ⁽¹⁾		(10,741		)		(11,307		)		(10,612		)
Net unpaid losses and loss expenses, beginning of year		26,562				27,008				26,831
Acquisition of subsidiaries		21,402				417				320
Total		47,964				27,425				27,151
Net losses and loss expenses incurred in respect of losses occurring in:
Current year		17,256				10,030				10,176
Prior years ⁽²⁾		(1,204		)		(546		)		(527		)
Total		16,052				9,484				9,649
Net losses and loss expenses paid in respect of losses occurring in:
Current year		5,899				4,053				3,975
Prior years		9,816				5,612				5,260
Total		15,715				9,665				9,235
Foreign currency revaluation and other		(469		)		(682		)		(557		)
Net unpaid losses and loss expenses, end of year		47,832				26,562				27,008
Reinsurance recoverable on unpaid losses ⁽¹⁾		12,708				10,741				11,307
Gross unpaid losses and loss expenses, end of year		$	60,540			$	37,303			$	38,315
⁽¹⁾ Net of provision for uncollectible reinsurance.
⁽²⁾ Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums.

Schedule Of Asbestos Environmental Loss Roll Forward and by segment

The following table presents a roll-forward of consolidated A&E loss reserves including allocated loss expense reserves for A&E exposures, and the provision for uncollectible paid and unpaid reinsurance recoverables:



	Asbestos						Environmental						Total
(in millions of U.S. dollars)	Gross			Net			Gross			Net			Gross			Net
Balance at December 31, 2015	$	1,351		$	831		$	199		$	149		$	1,550		$	980
Acquired reserves	488			468			371			354			859			822
Incurred activity	311			95			104			69			415			164			⁽¹⁾
Paid activity	(424		)	(275		)	(97		)	(82		)	(521		)	(357		)
Balance at December 31, 2016	$	1,726		$	1,119		$	577		$	490		$	2,303		$	1,609

⁽¹⁾Excludes unallocated loss expenses and the net activity reflects third-party reinsurance other than the aggregate excess of loss reinsurance provided by National Indemnity Company (NICO) to Westchester Specialty (see Westchester Specialty section below).

The A&E net loss reserves including allocated loss expense reserves and provision for uncollectible reinsurance at December 31, 2016 and 2015 shown in the table above is comprised of:



	December 31
(in millions of U.S. dollars)	2016		2015
Brandywine operations	$	760	$	782
Westchester Specialty	112		115
Chubb Corp	657		—
Other, mainly Overseas General Insurance	80		83
Total	$	1,609	$	980