XML 59 R43.htm IDEA: XBRL DOCUMENT
v3.25.4

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. + Details
Name: | acgl_ScheduleOfSegmentReportingInformationByLineOfBusinessAndLocationTableTextBlock
Namespace Prefix: | acgl_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 + Details
Name: | us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration