Insurance Claim Reserves (Tables)

12 Months Ended

Dec. 31, 2020

Insurance Loss Reserves [Abstract]

Claims and claim adjustment expense reserves [Table Text Block]

Claims and claim adjustment expense reserves were as follows:

(at December 31, in millions)	2020		2019
Property-casualty	$	54,510	$	51,836
Accident and health	11		13
Total	$	54,521	$	51,849

Reconciliation of beginning and ending property casualty reserve balances for claims and claim adjustment expenses [Table Text Block]

The following table presents a reconciliation of beginning and ending property casualty reserve balances for claims and claim adjustment expenses:

(at and for the year ended December 31, in millions)	2020		2019		2018
Claims and claim adjustment expense reserves at beginning of year	$	51,836	$	50,653	$	49,633
Less reinsurance recoverables on unpaid losses	8,035		8,182		8,123
Cumulative effect of adoption of updated accounting guidance for credit losses at January 1, 2020	53		—		—
Net reserves at beginning of year	43,854		42,471		41,510
Estimated claims and claim adjustment expenses for claims arising in the current year	19,285		18,854		18,614
Estimated increase (decrease) in claims and claim adjustment expenses for claims arising in prior years	(267)		164		(406)
Total increases	19,018		19,018		18,208
Claims and claim adjustment expense payments for claims arising in:
Current year	7,497		7,734		7,697
Prior years	9,092		10,060		9,363
Total payments	16,589		17,794		17,060
Unrealized foreign exchange loss (gain)	74		106		(187)
Net reserves at end of year	46,357		43,801		42,471
Plus reinsurance recoverables on unpaid losses	8,153		8,035		8,182
Claims and claim adjustment expense reserves at end of year	$	54,510	$	51,836	$	50,653

Summary of claims and claim adjustment expense reserves, including certain components, for the Company's major product lines by reporting segment [Table Text Block]

The following is a summary of claims and claim adjustment expense reserves, including certain components, for the Company’s major product lines by reporting segment at December 31, 2020.

(at December 31, 2020, in millions)	Net Undiscounted Claims and Claim Adjustment Expense Reserves		Discount (Net of Reinsurance)		Subtotal: Net Claims and Claim Adjustment Expense Reserves		Reinsurance Recoverables on Unpaid Losses (4)		Claims and Claim Adjustment Expense Reserves
Business Insurance
General liability	$	8,438	$	(143)	$	8,295	$	891	$	9,186
Commercial property	879		—		879		384		1,263
Commercial multi-peril	4,109		—		4,109		245		4,354
Commercial automobile	3,607		—		3,607		283		3,890
Workers’ compensation (1)	16,454		(929)		15,525		717		16,242
Bond & Specialty Insurance
General liability	2,148		—		2,148		122		2,270
Fidelity and surety	439		—		439		5		444
Personal Insurance
Automobile	2,768		—		2,768		448		3,216
Homeowners (excluding Other)	1,405		—		1,405		172		1,577
International - Canada	737		—		737		25		762
Subtotal — claims and allocated claim adjustment expenses for the products presented in the development tables below	40,984		(1,072)		39,912		3,292		43,204
Other insurance contracts (2)	4,100		(5)		4,095		1,968		6,063
Unallocated loss adjustment expense reserves	2,240		—		2,240		13		2,253
Structured settlements (3)	—		—		—		2,911		2,911
Other	110		—		110		(31)		79
Total property-casualty	47,434		(1,077)		46,357		8,153		54,510
Accident and health	—		—		—		11		11
Total	$	47,434	$	(1,077)	$	46,357	$	8,164	$	54,521

___________________________________________

(1)Net discount amount includes discount of $61 million on reinsurance recoverables for long-term disability and annuity claim payments.

(2)Primarily includes residual market, international (other than operations in Canada within the Personal Insurance segment) and runoff assumed reinsurance business.

(3)Includes structured settlements in cases where the Company did not receive a release from the claimant.

(4)Total reinsurance recoverables (on paid and unpaid losses) at December 31, 2020 were $8.35 billion.

Allocated claim adjustment expense, by accident year, on a historical basis for incurred and paid claims on an undiscounted, net of reinsurance basis [Table Text Block]

Business Insurance

General Liability

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves Dec 31, 2020		Cumulative Number of Reported Claims
2011	$	1,004	$	1,074	$	1,065	$	998	$	972	$	935	$	913	$	908	$	922	$	920	$	64	27,636
2012			989		985		935		913		892		905		917		920		941		77		24,995
2013					965		975		958		940		927		933		975		975		92		22,711
2014							976		989		983		948		956		1,013		988		127		22,465
2015									998		956		923		967		1,057		1,087		145		21,531
2016											1,075		1,058		1,087		1,187		1,204		281		20,325
2017													1,133		1,143		1,196		1,234		410		18,736
2018															1,253		1,312		1,344		588		18,200
2019																	1,447		1,486		933		16,060
2020																			1,467		1,268		8,637
																	Total		$	11,646

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	47	$	187	$	355	$	539	$	660	$	725	$	762	$	799	$	819	$	826
2012			32		150		295		489		589		699		754		811		831
2013					35		175		363		498		639		745		816		836
2014							37		163		321		515		640		750		805		Liability for Claims
2015									36		137		336		558		740		828		And Allocated Claim
2016											35		191		421		649		758		Adjustment Expenses,
2017													40		180		378		552		Net of Reinsurance
2018															42		202		441
2019																	51		233		2011 -		Before
2020																			61		2020		2011
																	Total		$	6,171	$	5,475	$	2,963
																			Total net liability				$	8,438

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	3.6	%	12.5	%	17.5	%	18.2	%	12.8	%	9.8	%	5.7	%	4.0	%	2.2	%	0.8	%

Commercial Property

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year											IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2016	$	896	$	863	$	820	$	809	$	813	$	14	22,337
2017			1,209		1,177		1,151		1,128		4		25,121
2018					1,093		1,079		1,070		25		25,013
2019							1,069		1,034		(6)		25,185
2020									1,107		160		22,387
							Total		$	5,152

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
	Unaudited
											Liability for Claims
Accident Year											And Allocated Claim
2016	$	441	$	685	$	745	$	767	$	780	Adjustment Expenses,
2017			618		1,003		1,073		1,094		Net of Reinsurance
2018					561		928		981
2019							610		957		2016 -		Before
2020									580		2020		2016
							Total		$	4,392	$	760	$	119
									Total net liability				$	879

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	54.6	%	33.0	%	6.2	%	2.2	%	1.6	%

Commercial Multi-Peril

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	2,235	$	2,244	$	2,269	$	2,286	$	2,296	$	2,287	$	2,283	$	2,279	$	2,272	$	2,272	$	24	125,994
2012			1,885		1,883		1,903		1,888		1,888		1,867		1,859		1,854		1,853		31		104,964
2013					1,615		1,623		1,620		1,609		1,591		1,600		1,599		1,598		31		83,921
2014							1,663		1,627		1,625		1,617		1,626		1,627		1,627		41		78,388
2015									1,568		1,625		1,593		1,597		1,606		1,593		64		71,812
2016											1,662		1,623		1,598		1,590		1,601		95		69,213
2017													1,872		1,928		1,956		1,919		132		71,967
2018															1,976		2,114		2,092		245		69,513
2019																	2,017		2,087		467		64,425
2020																			2,142		856		59,815
																	Total		$	18,784

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	1,060	$	1,573	$	1,803	$	1,979	$	2,088	$	2,156	$	2,193	$	2,222	$	2,234	$	2,239
2012			795		1,246		1,424		1,590		1,699		1,752		1,780		1,804		1,811
2013					644		987		1,167		1,304		1,410		1,475		1,516		1,532
2014							628		956		1,154		1,328		1,448		1,512		1,544		Liability for Claims
2015									595		970		1,144		1,310		1,409		1,452		And Allocated Claim
2016											585		950		1,133		1,278		1,373		Adjustment Expenses,
2017													716		1,199		1,388		1,531		Net of Reinsurance
2018															792		1,302		1,500
2019																	707		1,187		2011 -		Before
2020																			791		2020		2011
																	Total		$	14,960	$	3,824	$	285
																			Total net liability				$	4,109

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	38.8	%	23.0	%	10.6	%	9.0	%	6.1	%	3.3	%	1.9	%	1.2	%	0.5	%	0.2	%

Commercial Automobile

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
	Unaudited
Accident Year											IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2016	$	1,278	$	1,303	$	1,371	$	1,409	$	1,417	$	52	183,313
2017			1,386		1,501		1,524		1,522		113		191,931
2018					1,645		1,742		1,745		251		204,098
2019							1,835		1,951		547		205,355
2020									1,788		1,036		130,725
							Total		$	8,423

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
	Unaudited
											Liability for Claims
Accident Year											And Allocated Claim
2016	$	412	$	688	$	931	$	1,158	$	1,265	Adjustment Expenses,
2017			456		746		1,027		1,226		Net of Reinsurance
2018					515		848		1,159
2019							539		934		2016 -		Before
2020									437		2020		2016
							Total		$	5,021	$	3,402	$	205
									Total net liability				$	3,607

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	28.1	%	19.5	%	17.8	%	14.6	%	7.5	%

Workers’ Compensation

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	2,284	$	2,303	$	2,347	$	2,350	$	2,379	$	2,385	$	2,363	$	2,348	$	2,320	$	2,295	$	285	137,116
2012			2,447		2,456		2,457		2,456		2,445		2,453		2,416		2,387		2,377		340		138,346
2013					2,553		2,545		2,540		2,506		2,463		2,423		2,354		2,321		367		134,518
2014							2,554		2,553		2,547		2,476		2,430		2,393		2,352		434		131,355
2015									2,644		2,585		2,505		2,441		2,372		2,279		511		128,939
2016											2,768		2,690		2,569		2,473		2,372		569		123,652
2017													2,779		2,681		2,584		2,483		729		121,345
2018															2,744		2,687		2,599		922		122,416
2019																	2,680		2,714		1,023		118,868
2020																			2,559		1,690		86,459
																	Total		$	24,351

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	420	$	911	$	1,185	$	1,365	$	1,487	$	1,583	$	1,652	$	1,696	$	1,732	$	1,757
2012			443		940		1,217		1,394		1,536		1,629		1,689		1,735		1,768
2013					458		954		1,237		1,413		1,525		1,604		1,659		1,700
2014							455		944		1,224		1,399		1,505		1,581		1,634		Liability for Claims
2015									430		893		1,154		1,310		1,411		1,470		And Allocated Claim
2016											421		873		1,118		1,272		1,367		Adjustment Expenses,
2017													433		890		1,154		1,314		Net of Reinsurance
2018															440		919		1,169
2019																	466		951		2011 -		Before
2020																			389		2020		2011
																	Total		$	13,519	$	10,832	$	5,622
																			Total net liability				$	16,454

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	17.9	%	19.8	%	11.2	%	7.2	%	4.9	%	3.5	%	2.5	%	1.9	%	1.5	%	1.1	%

Bond & Specialty Insurance

General Liability

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	565	$	596	$	639	$	632	$	601	$	545	$	520	$	508	$	506	$	504	$	2	5,219
2012			538		591		614		605		601		599		605		593		581		7		4,869
2013					510		565		606		630		654		607		586		575		3		4,465
2014							549		571		563		518		473		452		450		18		4,367
2015									528		524		486		437		395		414		35		4,217
2016											512		511		504		520		514		53		4,371
2017													534		517		526		493		69		4,544
2018															530		548		585		150		4,693
2019																	588		653		317		4,992
2020																			772		598		3,450
																	Total		$	5,541

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	33	$	143	$	249	$	324	$	414	$	447	$	476	$	490	$	496	$	501
2012			38		160		255		342		383		419		436		453		459
2013					34		154		252		352		400		434		451		462
2014							38		150		239		312		367		407		418		Liability for Claims
2015									38		141		234		310		338		348		And Allocated Claim
2016											30		141		233		313		378		Adjustment Expenses,
2017													38		155		262		340		Net of Reinsurance
2018															49		182		290
2019																	51		189		2011 -		Before
2020																			52		2020		2011
																	Total		$	3,437	$	2,104	$	44
																			Total net liability				$	2,148

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	7.3	%	22.5	%	19.4	%	16.2	%	10.9	%	6.0	%	3.5	%	2.5	%	1.1	%	1.0	%

Fidelity and Surety

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	226	$	239	$	205	$	208	$	215	$	13	892
2017			244		271		240		241		21		926
2018					220		235		220		1		886
2019							203		193		45		827
2020									274		189		580
							Total		$	1,143

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	54	$	121	$	142	$	149	$	174	Adjustment Expenses,
2017			70		166		194		205		Net of Reinsurance
2018					64		171		202
2019							49		121		2016 -		Before
2020									50		2020		2016
							Total		$	752	$	391	$	48
									Total net liability				$	439

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	25.3	%	39.4	%	11.9	%	3.9	%	11.6	%

Personal Insurance

Automobile

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	2,779	$	2,791	$	2,772	$	2,752	$	2,745	$	14	922,219
2017			3,323		3,256		3,221		3,206		57		1,062,577
2018					3,281		3,269		3,233		155		1,050,608
2019							3,362		3,361		368		1,029,935
2020									2,829		807		741,369
							Total		$	15,374

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	1,610	$	2,203	$	2,466	$	2,616	$	2,686	Adjustment Expenses,
2017			1,912		2,575		2,887		3,046		Net of Reinsurance
2018					1,889		2,582		2,880
2019							1,933		2,650		2016 -		Before
2020									1,571		2020		2016
							Total		$	12,833	$	2,541	$	227
									Total net liability				$	2,768

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	58.0	%	21.3	%	9.5	%	5.2	%	2.5	%

Homeowners (excluding Other)

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	1,556	$	1,547	$	1,525	$	1,511	$	1,506	$	5	144,534
2017			2,312		2,340		2,343		2,170		27		170,114
2018					2,610		2,574		2,381		32		187,093
2019							2,297		2,344		65		179,977
2020									3,019		737		192,501
							Total		$	11,420

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	1,049	$	1,392	$	1,455	$	1,479	$	1,489	Adjustment Expenses,
2017			1,471		2,059		2,197		2,089		Net of Reinsurance
2018					1,657		2,298		2,255
2019							1,613		2,179		2016 -		Before
2020									2,019		2020		2016
							Total		$	10,031	$	1,389	$	16
									Total net liability				$	1,405

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	68.6	%	25.2	%	2.9	%	(1.7)	%	0.6	%

International - Canada

	(dollars in millions)
	For the Years Ended December 31,																				IBNR Reserves December 31, 2020		Cumulative
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020				Number of
Accident	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance																						Reported
Year	Unaudited																						Claims
2011	$	467	$	445	$	453	$	449	$	441	$	434	$	429	$	424	$	414	$	415	$	(2)	55,789
2012			442		420		421		404		403		386		380		368		368		1		51,227
2013					493		486		477		465		452		450		440		435		(4)		54,237
2014							436		452		452		440		433		430		430		(6)		52,290
2015									366		366		366		362		363		363		7		45,205
2016											367		416		416		426		426		8		45,759
2017													352		387		410		410		16		46,808
2018															447		469		471		33		50,558
2019																	452		447		60		47,945
2020																			353		132		28,763
																	Total		$	4,118

Accident	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Year	Unaudited
2011	$	179	$	253	$	285	$	319	$	355	$	377	$	396	$	404	$	408		$	412
2012			168		235		266		292		321		339		348		353			359
2013					197		276		309		342		375		394		411			420
2014							193		270		307		336		368		390			407		Liability for Claims
2015									164		230		258		287		312			327		And Allocated Claim
2016											215		288		315		349			373		Adjustment Expenses,
2017													185		261		301			326		Net of Reinsurance
2018															222		310			346
2019																	219			294		2011 -		Before
2020																				146		2020		2011
																	Total			$	3,410	$	708	$	29
																			Total net liability					$	737

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	45.7	%	17.9	%	8.0	%	7.5	%	7.3	%	4.7	%	3.7	%	1.7	%	1.3	%	0.9	%

Historical average annual percentage payout of incurred claims by age of accident year [Table Text Block]

Business Insurance

General Liability

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves Dec 31, 2020		Cumulative Number of Reported Claims
2011	$	1,004	$	1,074	$	1,065	$	998	$	972	$	935	$	913	$	908	$	922	$	920	$	64	27,636
2012			989		985		935		913		892		905		917		920		941		77		24,995
2013					965		975		958		940		927		933		975		975		92		22,711
2014							976		989		983		948		956		1,013		988		127		22,465
2015									998		956		923		967		1,057		1,087		145		21,531
2016											1,075		1,058		1,087		1,187		1,204		281		20,325
2017													1,133		1,143		1,196		1,234		410		18,736
2018															1,253		1,312		1,344		588		18,200
2019																	1,447		1,486		933		16,060
2020																			1,467		1,268		8,637
																	Total		$	11,646

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	47	$	187	$	355	$	539	$	660	$	725	$	762	$	799	$	819	$	826
2012			32		150		295		489		589		699		754		811		831
2013					35		175		363		498		639		745		816		836
2014							37		163		321		515		640		750		805		Liability for Claims
2015									36		137		336		558		740		828		And Allocated Claim
2016											35		191		421		649		758		Adjustment Expenses,
2017													40		180		378		552		Net of Reinsurance
2018															42		202		441
2019																	51		233		2011 -		Before
2020																			61		2020		2011
																	Total		$	6,171	$	5,475	$	2,963
																			Total net liability				$	8,438

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	3.6	%	12.5	%	17.5	%	18.2	%	12.8	%	9.8	%	5.7	%	4.0	%	2.2	%	0.8	%

Commercial Property

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year											IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2016	$	896	$	863	$	820	$	809	$	813	$	14	22,337
2017			1,209		1,177		1,151		1,128		4		25,121
2018					1,093		1,079		1,070		25		25,013
2019							1,069		1,034		(6)		25,185
2020									1,107		160		22,387
							Total		$	5,152

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
	Unaudited
											Liability for Claims
Accident Year											And Allocated Claim
2016	$	441	$	685	$	745	$	767	$	780	Adjustment Expenses,
2017			618		1,003		1,073		1,094		Net of Reinsurance
2018					561		928		981
2019							610		957		2016 -		Before
2020									580		2020		2016
							Total		$	4,392	$	760	$	119
									Total net liability				$	879

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	54.6	%	33.0	%	6.2	%	2.2	%	1.6	%

Commercial Multi-Peril

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	2,235	$	2,244	$	2,269	$	2,286	$	2,296	$	2,287	$	2,283	$	2,279	$	2,272	$	2,272	$	24	125,994
2012			1,885		1,883		1,903		1,888		1,888		1,867		1,859		1,854		1,853		31		104,964
2013					1,615		1,623		1,620		1,609		1,591		1,600		1,599		1,598		31		83,921
2014							1,663		1,627		1,625		1,617		1,626		1,627		1,627		41		78,388
2015									1,568		1,625		1,593		1,597		1,606		1,593		64		71,812
2016											1,662		1,623		1,598		1,590		1,601		95		69,213
2017													1,872		1,928		1,956		1,919		132		71,967
2018															1,976		2,114		2,092		245		69,513
2019																	2,017		2,087		467		64,425
2020																			2,142		856		59,815
																	Total		$	18,784

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	1,060	$	1,573	$	1,803	$	1,979	$	2,088	$	2,156	$	2,193	$	2,222	$	2,234	$	2,239
2012			795		1,246		1,424		1,590		1,699		1,752		1,780		1,804		1,811
2013					644		987		1,167		1,304		1,410		1,475		1,516		1,532
2014							628		956		1,154		1,328		1,448		1,512		1,544		Liability for Claims
2015									595		970		1,144		1,310		1,409		1,452		And Allocated Claim
2016											585		950		1,133		1,278		1,373		Adjustment Expenses,
2017													716		1,199		1,388		1,531		Net of Reinsurance
2018															792		1,302		1,500
2019																	707		1,187		2011 -		Before
2020																			791		2020		2011
																	Total		$	14,960	$	3,824	$	285
																			Total net liability				$	4,109

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	38.8	%	23.0	%	10.6	%	9.0	%	6.1	%	3.3	%	1.9	%	1.2	%	0.5	%	0.2	%

Commercial Automobile

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
	Unaudited
Accident Year											IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2016	$	1,278	$	1,303	$	1,371	$	1,409	$	1,417	$	52	183,313
2017			1,386		1,501		1,524		1,522		113		191,931
2018					1,645		1,742		1,745		251		204,098
2019							1,835		1,951		547		205,355
2020									1,788		1,036		130,725
							Total		$	8,423

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
	Unaudited
											Liability for Claims
Accident Year											And Allocated Claim
2016	$	412	$	688	$	931	$	1,158	$	1,265	Adjustment Expenses,
2017			456		746		1,027		1,226		Net of Reinsurance
2018					515		848		1,159
2019							539		934		2016 -		Before
2020									437		2020		2016
							Total		$	5,021	$	3,402	$	205
									Total net liability				$	3,607

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	28.1	%	19.5	%	17.8	%	14.6	%	7.5	%

Workers’ Compensation

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	2,284	$	2,303	$	2,347	$	2,350	$	2,379	$	2,385	$	2,363	$	2,348	$	2,320	$	2,295	$	285	137,116
2012			2,447		2,456		2,457		2,456		2,445		2,453		2,416		2,387		2,377		340		138,346
2013					2,553		2,545		2,540		2,506		2,463		2,423		2,354		2,321		367		134,518
2014							2,554		2,553		2,547		2,476		2,430		2,393		2,352		434		131,355
2015									2,644		2,585		2,505		2,441		2,372		2,279		511		128,939
2016											2,768		2,690		2,569		2,473		2,372		569		123,652
2017													2,779		2,681		2,584		2,483		729		121,345
2018															2,744		2,687		2,599		922		122,416
2019																	2,680		2,714		1,023		118,868
2020																			2,559		1,690		86,459
																	Total		$	24,351

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	420	$	911	$	1,185	$	1,365	$	1,487	$	1,583	$	1,652	$	1,696	$	1,732	$	1,757
2012			443		940		1,217		1,394		1,536		1,629		1,689		1,735		1,768
2013					458		954		1,237		1,413		1,525		1,604		1,659		1,700
2014							455		944		1,224		1,399		1,505		1,581		1,634		Liability for Claims
2015									430		893		1,154		1,310		1,411		1,470		And Allocated Claim
2016											421		873		1,118		1,272		1,367		Adjustment Expenses,
2017													433		890		1,154		1,314		Net of Reinsurance
2018															440		919		1,169
2019																	466		951		2011 -		Before
2020																			389		2020		2011
																	Total		$	13,519	$	10,832	$	5,622
																			Total net liability				$	16,454

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	17.9	%	19.8	%	11.2	%	7.2	%	4.9	%	3.5	%	2.5	%	1.9	%	1.5	%	1.1	%

Bond & Specialty Insurance

General Liability

	(dollars in millions)
	For the Years Ended December 31,
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020
	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
	Unaudited
Accident Year																					IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
2011	$	565	$	596	$	639	$	632	$	601	$	545	$	520	$	508	$	506	$	504	$	2	5,219
2012			538		591		614		605		601		599		605		593		581		7		4,869
2013					510		565		606		630		654		607		586		575		3		4,465
2014							549		571		563		518		473		452		450		18		4,367
2015									528		524		486		437		395		414		35		4,217
2016											512		511		504		520		514		53		4,371
2017													534		517		526		493		69		4,544
2018															530		548		585		150		4,693
2019																	588		653		317		4,992
2020																			772		598		3,450
																	Total		$	5,541

	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited
2011	$	33	$	143	$	249	$	324	$	414	$	447	$	476	$	490	$	496	$	501
2012			38		160		255		342		383		419		436		453		459
2013					34		154		252		352		400		434		451		462
2014							38		150		239		312		367		407		418		Liability for Claims
2015									38		141		234		310		338		348		And Allocated Claim
2016											30		141		233		313		378		Adjustment Expenses,
2017													38		155		262		340		Net of Reinsurance
2018															49		182		290
2019																	51		189		2011 -		Before
2020																			52		2020		2011
																	Total		$	3,437	$	2,104	$	44
																			Total net liability				$	2,148

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	7.3	%	22.5	%	19.4	%	16.2	%	10.9	%	6.0	%	3.5	%	2.5	%	1.1	%	1.0	%

Fidelity and Surety

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	226	$	239	$	205	$	208	$	215	$	13	892
2017			244		271		240		241		21		926
2018					220		235		220		1		886
2019							203		193		45		827
2020									274		189		580
							Total		$	1,143

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	54	$	121	$	142	$	149	$	174	Adjustment Expenses,
2017			70		166		194		205		Net of Reinsurance
2018					64		171		202
2019							49		121		2016 -		Before
2020									50		2020		2016
							Total		$	752	$	391	$	48
									Total net liability				$	439

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	25.3	%	39.4	%	11.9	%	3.9	%	11.6	%

Personal Insurance

Automobile

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	2,779	$	2,791	$	2,772	$	2,752	$	2,745	$	14	922,219
2017			3,323		3,256		3,221		3,206		57		1,062,577
2018					3,281		3,269		3,233		155		1,050,608
2019							3,362		3,361		368		1,029,935
2020									2,829		807		741,369
							Total		$	15,374

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	1,610	$	2,203	$	2,466	$	2,616	$	2,686	Adjustment Expenses,
2017			1,912		2,575		2,887		3,046		Net of Reinsurance
2018					1,889		2,582		2,880
2019							1,933		2,650		2016 -		Before
2020									1,571		2020		2016
							Total		$	12,833	$	2,541	$	227
									Total net liability				$	2,768

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	58.0	%	21.3	%	9.5	%	5.2	%	2.5	%

Homeowners (excluding Other)

	(dollars in millions)
	For the Years Ended December 31,
	2016		2017		2018		2019		2020		IBNR Reserves December 31, 2020		Cumulative Number of Reported Claims
	Incurred Claims and Allocated Claims Adjustment
	Expenses, Net of Reinsurance
Accident Year	Unaudited
2016	$	1,556	$	1,547	$	1,525	$	1,511	$	1,506	$	5	144,534
2017			2,312		2,340		2,343		2,170		27		170,114
2018					2,610		2,574		2,381		32		187,093
2019							2,297		2,344		65		179,977
2020									3,019		737		192,501
							Total		$	11,420

	Cumulative Paid Claims and Allocated Claim
	Adjustment Expenses, Net of Reinsurance
Accident Year	Unaudited										Liability for Claims
											And Allocated Claim
2016	$	1,049	$	1,392	$	1,455	$	1,479	$	1,489	Adjustment Expenses,
2017			1,471		2,059		2,197		2,089		Net of Reinsurance
2018					1,657		2,298		2,255
2019							1,613		2,179		2016 -		Before
2020									2,019		2020		2016
							Total		$	10,031	$	1,389	$	16
									Total net liability				$	1,405

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5
	68.6	%	25.2	%	2.9	%	(1.7)	%	0.6	%

International - Canada

	(dollars in millions)
	For the Years Ended December 31,																				IBNR Reserves December 31, 2020		Cumulative
	2011		2012		2013		2014		2015		2016		2017		2018		2019		2020				Number of
Accident	Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance																						Reported
Year	Unaudited																						Claims
2011	$	467	$	445	$	453	$	449	$	441	$	434	$	429	$	424	$	414	$	415	$	(2)	55,789
2012			442		420		421		404		403		386		380		368		368		1		51,227
2013					493		486		477		465		452		450		440		435		(4)		54,237
2014							436		452		452		440		433		430		430		(6)		52,290
2015									366		366		366		362		363		363		7		45,205
2016											367		416		416		426		426		8		45,759
2017													352		387		410		410		16		46,808
2018															447		469		471		33		50,558
2019																	452		447		60		47,945
2020																			353		132		28,763
																	Total		$	4,118

Accident	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
Year	Unaudited
2011	$	179	$	253	$	285	$	319	$	355	$	377	$	396	$	404	$	408		$	412
2012			168		235		266		292		321		339		348		353			359
2013					197		276		309		342		375		394		411			420
2014							193		270		307		336		368		390			407		Liability for Claims
2015									164		230		258		287		312			327		And Allocated Claim
2016											215		288		315		349			373		Adjustment Expenses,
2017													185		261		301			326		Net of Reinsurance
2018															222		310			346
2019																	219			294		2011 -		Before
2020																				146		2020		2011
																	Total			$	3,410	$	708	$	29
																			Total net liability					$	737

	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
	Unaudited
Years	1		2		3		4		5		6		7		8		9		10
	45.7	%	17.9	%	8.0	%	7.5	%	7.3	%	4.7	%	3.7	%	1.7	%	1.3	%	0.9	%