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Segment Information (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Analysis of underwriting income (loss) by segment and reconciliation to net income (loss) available to common shareholders

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to Arch common shareholders, summary information regarding net premiums written and earned by major line of business and net premiums written by location:

			Year Ended December 31, 2024
			Insurance						Reinsurance						Mortgage																		Total
Gross premiums written (1)			$	9,053					$	11,112					$	1,351																	$	21,511
Premiums ceded (1)			(2,179)						(3,366)						(239)																		(5,779)
Net premiums written			6,874						7,746						1,112																		15,732
Change in unearned premiums			(247)						(504)						119																		(632)
Net premiums earned			6,627						7,242						1,231																		15,100
Other underwriting income			—						9						17																		26
Losses and loss adjustment expenses			(4,070)						(4,327)						55																		(8,342)
Acquisition expenses			(1,217)						(1,432)						(2)																		(2,651)
Other operating expenses (2)			(995)						(270)						(207)																		(1,472)
Underwriting income			$	345					$	1,222					$	1,094																	2,661
Net investment income																																	1,495
Net realized gains (losses)																																	197
Equity in net income (loss) of investments accounted for using the equity method																																	580
Other income (loss)																																	42
Corporate expenses																																	(119)
Transaction costs and other																																	(81)
Amortization of intangible assets																																	(235)
Interest expense																																	(141)
Net foreign exchange gains (losses)																																	75
Income (loss) before income taxes and income (loss) from operating affiliates																																	4,474
Income tax (expense) benefit																																	(362)
Income (loss) from operating affiliates																																	200
Net income (loss) available to Arch																																	4,312
Preferred dividends																																	(40)
Net income (loss) available to Arch common shareholders																																	$	4,272
Underwriting Ratios
Loss ratio			61.4		%				59.7		%				-4.4		%																55.2		%
Acquisition expense ratio			18.4		%				19.8		%				0.2		%																17.6		%
Other operating expense ratio			15.0		%				3.7		%				16.8		%																9.7		%
Combined ratio			94.8		%				83.2		%				12.6		%																82.5		%
Goodwill and intangible assets			$	916					$	102					$	333																	$	1,351
Total investable assets																																	$	41,388
Total assets																																	70,906
Total liabilities																																	50,086

(1)    Certain assumed and ceded amounts related to intersegment transactions are included in individual segment results. Accordingly, the sum of such transactions for each segment does not agree to the total due to eliminations.

(2)    Other operating expenses primarily include expenses that are related to compensation and employee benefits, information technology and professional fees.

			Year Ended December 31, 2023
			Insurance						Reinsurance						Mortgage																		Total
Gross premiums written (1)			$	7,911					$	9,113					$	1,387																	$	18,403
Premiums ceded (1)			(2,049)						(2,559)						(335)																		(4,935)
Net premiums written			5,862						6,554						1,052																		13,468
Change in unearned premiums			(416)						(718)						106																		(1,028)
Net premiums earned			5,446						5,836						1,158																		12,440
Other underwriting income			—						17						14																		31
Losses and loss adjustment expenses			(3,122)						(3,227)						103																		(6,246)
Acquisition expenses, net			(1,055)						(1,240)						(17)																		(2,312)
Other operating expenses (2)			(819)						(288)						(194)																		(1,301)
Underwriting income (loss)			$	450					$	1,098					$	1,064																	2,612
Net investment income																																	1,023
Net realized gains (losses)																																	(165)
Equity in net income (loss) of investments accounted for using the equity method																																	278
Other income (loss)																																	27
Corporate expenses																																	(96)
Transaction costs and other																																	(6)
Amortization of intangible assets																																	(95)
Interest expense																																	(133)
Net foreign exchange gains (losses)																																	(60)
Income (loss) before income taxes and income (loss) from operating affiliates																																	3,385
Income tax (expense) benefit																																	873
Income (loss) from operating affiliates																																	184
Net income (loss)																																	4,442
Amounts attributable to redeemable noncontrolling interests																																	1
Net income (loss) available to Arch																																	4,443
Preferred dividends																																	(40)
Net income (loss) available to Arch common shareholders																																	$	4,403
Underwriting Ratios
Loss ratio			57.3		%				55.3		%				-8.9		%																50.2		%
Acquisition expense ratio			19.4		%				21.2		%				1.4		%																18.6		%
Other operating expense ratio			15.0		%				4.9		%				16.8		%																10.5		%
Combined ratio			91.7		%				81.4		%				9.3		%																79.3		%
Goodwill and intangible assets			$	224					$	130					$	377																	$	731
Total investable assets																																	$	34,589
Total assets																																	58,906
Total liabilities																																	40,551

(1)    Certain assumed and ceded amounts related to intersegment transactions are included in individual segment results. Accordingly, the sum of such transactions for each segment does not agree to the total due to eliminations.

(2)    Other operating expenses primarily include expenses that are related to compensation and employee benefits, information technology and professional fees.

			Year Ended December 31, 2022
			Insurance						Reinsurance						Mortgage																		Total
Gross premiums written (1)			$	6,931					$	6,948					$	1,455																	$	15,327
Premiums ceded (1)			(1,910)						(2,024)						(322)																		(4,249)
Net premiums written			5,021						4,924						1,133																		11,078
Change in unearned premiums			(461)						(965)						27																		(1,399)
Net premiums earned			4,560						3,959						1,160																		9,679
Other underwriting income			—						5						8																		13
Losses and loss adjustment expenses			(2,784)						(2,568)						324																		(5,028)
Acquisition expenses, net			(887)						(813)						(40)																		(1,740)
Other operating expenses (2)			(665)						(268)						(195)																		(1,128)
Underwriting income (loss)			$	224					$	315					$	1,257																	1,796
Net investment income																																	496
Net realized gains (losses)																																	(663)
Equity in net income (loss) of investments accounted for using the equity method																																	115
Other income (loss)																																	(27)
Corporate expenses																																	(95)
Transaction costs and other																																	—
Amortization of intangible assets																																	(106)
Interest expense																																	(131)
Net foreign exchange gains (losses)																																	102
Income (loss) before income taxes and income (loss) from operating affiliates																																	1,487
Income tax (expense) benefit																																	(80)
Income (loss) from operating affiliates																																	75
Net income																																	1,482
Amounts attributable to redeemable noncontrolling interests																																	(6)
Net income (loss) available to Arch																																	1,476
Preferred dividends																																	(40)
Net income (loss) available to Arch common shareholders																																	$	1,436
Underwriting Ratios
Loss ratio			61.0		%				64.9		%				-28.0		%																51.9		%
Acquisition expense ratio			19.4		%				20.5		%				3.5		%																18.0		%
Other operating expense ratio			14.6		%				6.8		%				16.8		%																11.7		%
Combined ratio			95.0		%				92.2		%				-7.7		%																81.6		%
Goodwill and intangible assets			$	229					$	145					$	430																	$	804
Total investable assets																																	$	28,065
Total assets																																	47,990
Total liabilities																																	35,069

(1)    Certain assumed and ceded amounts related to intersegment transactions are included in individual segment results. Accordingly, the sum of such transactions for each segment does not agree to the total due to eliminations.

(2)    Other operating expenses primarily include expenses that are related to compensation and employee benefits, information technology and professional fees.

Summary of information regarding net premiums earned by major line of business and net premiums written by underwriting location

The following tables provide summary information regarding net premiums earned by major line of business and net premiums written by underwriting location:

INSURANCE SEGMENT			Year Ended December 31,
			2024						2023						2022
Net premiums earned
North America
Property and short-tail specialty			$	1,165					$	976					$	746
Other liability - occurrence			942						618						509
Other liability - claims made			843						866						874
Workers compensation			549						495						415
Commercial automobile			459						343						287
Commercial multi-peril			435						193						197
Other			309						290						255
Total North America			4,702						3,781						3,283
International
Property and short-tail specialty			$	1,050					$	885					$	613
Casualty and other			875						780						664
Total International			1,925						1,665						1,277
Total			$	6,627					$	5,446					$	4,560
Net premiums written by underwriting location
North America			$	4,869					$	3,995					$	3,527
International			2,005						1,867						1,494
Total			$	6,874					$	5,862					$	5,021

REINSURANCE SEGMENT			Year Ended December 31,
			2024						2023						2022
Net premiums earned
Other specialty			$	2,619					$	2,097					$	1,378
Property excluding property catastrophe			2,148						1,645						1,090
Casualty			1,088						1,005						855
Property catastrophe			959						742						367
Marine and aviation			276						229						159
Other			152						118						110
Total			$	7,242					$	5,836					$	3,959
Net premiums written by underwriting location
Bermuda			$	3,425					$	3,288					$	2,561
United States			2,135						1,756						1,247
Europe and other			2,186						1,510						1,116
Total			$	7,746					$	6,554					$	4,924

MORTGAGE SEGMENT			Year Ended December 31,
			2024						2023						2022
Net premiums earned
U.S. primary mortgage insurance			$	845					$	759					$	804
U.S. credit risk transfer (CRT) and other			213						220						196
International mortgage insurance/reinsurance			173						179						160
Total			$	1,231					$	1,158					$	1,160
Net premiums written by underwriting location
United States			$	823					$	743					$	781
Other			289						309						352
Total			$	1,112					$	1,052					$	1,133

X

- Definition

Tabular disclosure of premiums earned by major line of business, and of net premiums written by underwriting location.

+ References

No definition available.

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- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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