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Segment Information (Tables)

12 Months Ended

Dec. 31, 2025

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, 2025
			Insurance						Reinsurance						Mortgage																		Total
Gross premiums written (1)			$	10,435					$	11,149					$	1,305																	$	22,878
Premiums ceded (1)			(2,637)						(3,531)						(245)																		(6,402)
Net premiums written			7,798						7,618						1,060																		16,476
Change in unearned premiums			(27)						504						112																		589
Net premiums earned			7,771						8,122						1,172																		17,065
Other underwriting income (2)			36						159						22																		217
Losses and loss adjustment expenses			(4,764)						(4,610)						4																		(9,370)
Acquisition expenses			(1,496)						(1,644)						(13)																		(3,153)
Other operating expenses (3)			(1,172)						(469)						(185)																		(1,826)
Underwriting income			$	375					$	1,558					$	1,000																	2,933
Net investment income																																	1,625
Net realized gains (losses)																																	464
Equity in net income (loss) of investments accounted for using the equity method																																	504
Other income (loss)																																	54
Corporate expenses (4)																																	(57)
Transaction costs and other (4)																																	(75)
Amortization of intangible assets																																	(193)
Interest expense																																	(148)
Net foreign exchange gains (losses)																																	(128)
Income (loss) before income taxes and income (loss) from operating affiliates																																	4,979
Income tax (expense) benefit																																	(760)
Income (loss) from operating affiliates																																	180
Net income (loss)																																	4,399
Amounts attributable to redeemable noncontrolling interests																																	—
Net income (loss) available to Arch																																	4,399
Preferred dividends																																	(40)
Net income (loss) available to Arch common shareholders																																	$	4,359
Underwriting Ratios
Loss ratio			61.3		%				56.8		%				-0.4		%																54.9		%
Acquisition expense ratio			19.3		%				20.2		%				1.1		%																18.5		%
Other operating expense ratio (5)			14.6		%				3.8		%				13.9		%																9.4		%
Combined ratio			95.2		%				80.8		%				14.6		%																82.8		%
Goodwill and intangible assets			$	793					$	98					$	331																	$	1,222
Total investable assets																																	$	47,369
Total assets																																	79,241
Total liabilities																																	55,035

(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 underwriting income’ includes revenue earned from underwriting-related activities covered under existing service contracts.

(3)    Other operating expenses primarily include expenses that are related to compensation and employee benefits, information technology and professional fees, reduced in part by substance based credits. See note 3(u).

(4)    Certain expenses have been excluded from ‘Corporate expenses’ and reflected in ‘Transaction costs and other.’ See note 3(u).

(5)    The ‘Other operating expense ratio’ for the 2025 period includes ‘Other underwriting income.’

			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 (loss)			$	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 (3)																																	(119)
Transaction costs and other (3)																																	(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)																																	4,312
Amounts attributable to redeemable noncontrolling interests																																	—
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.

(3)    Certain expenses have been excluded from ‘Corporate expenses’ and reflected in ‘Transaction costs and other.’

			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			(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 (3)																																	(96)
Transaction costs and other (3)																																	(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																																	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.

(3)    Certain expenses have been excluded from ‘Corporate expenses’ and reflected in ‘Transaction costs and other.’

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,
			2025						2024						2023
Net premiums earned
North America
Property and short-tail specialty			$	1,373					$	1,165					$	976
Other liability - occurrence			1,321						942						618
Other liability - claims made			786						843						866
Commercial multi-peril			792						435						193
Commercial automobile			581						459						343
Workers compensation			591						549						495
Other			291						309						290
Total North America			5,735						4,702						3,781
International
Property and short-tail specialty			$	1,099					$	1,061					$	885
Casualty and other			937						864						780
Total International			2,036						1,925						1,665
Total			$	7,771					$	6,627					$	5,446
Net premiums written by underwriting location
North America			$	5,724					$	4,869					$	3,995
International			2,074						2,005						1,867
Total			$	7,798					$	6,874					$	5,862

REINSURANCE SEGMENT			Year Ended December 31,
			2025						2024						2023
Net premiums earned
Specialty			$	2,906					$	2,619					$	2,097
Property excluding property catastrophe			2,252						2,148						1,645
Casualty			1,432						1,088						1,005
Property catastrophe			1,065						959						742
Marine and aviation			317						276						229
Other			150						152						118
Total			$	8,122					$	7,242					$	5,836
Net premiums written by underwriting location
Bermuda			$	3,672					$	3,425					$	3,288
United States			1,798						2,135						1,756
Europe and other			2,148						2,186						1,510
Total			$	7,618					$	7,746					$	6,554

MORTGAGE SEGMENT			Year Ended December 31,
			2025						2024						2023
Net premiums earned
U.S. primary mortgage insurance			$	802					$	845					$	759
U.S. credit risk transfer (CRT) and other			207						213						220
International mortgage insurance/reinsurance			163						173						179
Total			$	1,172					$	1,231					$	1,158
Net premiums written by underwriting location
United States			$	780					$	823					$	743
Other			280						289						309
Total			$	1,060					$	1,112					$	1,052

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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