XML 37 R20.htm IDEA: XBRL DOCUMENT
v3.25.2

Other Comprehensive Income (Loss) | 6 Months Ended
--- | ---
Jun. 30, 2025
Comprehensive Income Note Disclosure [Abstract] |
Other Comprehensive Income (Loss) | The following tables present details about amounts reclassified from accumulated other comprehensive income and the tax effects allocated to each component of other comprehensive income (loss):
|  |  |  | Amounts Reclassified from AOCI
|  | Consolidated Statement of Income |  | Three Months Ended |  | Six Months Ended
Details About |  | Line Item That Includes |  | June 30, |  | June 30,
AOCI Components |  | Reclassification |  | 2025 |  | 2024 |  | 2025 |  | 2024
Unrealized appreciation (decline) on available-for-sale investments |  |  |  |  |  |  |  |
|  | Net realized gains (losses) |  | $ | 14 |  |  | $ | (64) |  |  | $ | (49) |  |  | $ | (92) |
|  | Provision for credit losses |  | (8) |  |  | 4 |  |  | (8) |  |  | (2) |
|  | Total before tax |  | 6 |  |  | (60) |  |  | (57) |  |  | (94) |
|  | Income tax (expense) benefit |  | 1 |  |  | 7 |  |  | 12 |  |  | 12 |
|  | Net of tax |  | $ | 7 |  |  | $ | (53) |  |  | $ | (45) |  |  | $ | (82) |
| Before Tax Amount |  | Tax Expense (Benefit) |  | Net of Tax Amount
Three Months Ended June 30, 2025 |  |  |  |  |
Unrealized appreciation (decline) in value of investments: |  |  |  |  |
Unrealized holding gains (losses) arising during period | $ | 304 |  |  | $ | 1 |  |  | $ | 303 |
Less reclassification of net realized gains (losses) included in net income | 6 |  |  | (1) |  |  | 7 |
Foreign currency translation adjustments | 62 |  |  | (2) |  |  | 64 |
Other comprehensive income (loss) | $ | 360 |  |  | $ | — |  |  | $ | 360 |
Three Months Ended June 30, 2024 |  |  |  |  |
Unrealized appreciation (decline) in value of investments: |  |  |  |  |
Unrealized holding gains (losses) arising during period | $ | (36) |  |  | $ | (10) |  |  | $ | (26) |
Less reclassification of net realized gains (losses) included in net income | (60) |  |  | (7) |  |  | (53) |
Foreign currency translation adjustments | (16) |  |  | — |  |  | (16) |
Other comprehensive income (loss) | $ | 8 |  |  | $ | (3) |  |  | $ | 11 |
Six Months Ended June 30, 2025 |  |  |  |  |
Unrealized appreciation (decline) in value of investments: |  |  |  |  |
Unrealized holding gains (losses) arising during period | $ | 549 |  |  | $ | 12 |  |  | $ | 537 |
Less reclassification of net realized gains (losses) included in net income | (57) |  |  | (12) |  |  | (45) |
Foreign currency translation adjustments | 88 |  |  | (2) |  |  | 90 |
Other comprehensive income (loss) | $ | 694 |  |  | $ | 22 |  |  | $ | 672 |
Six Months Ended June 30, 2024 |  |  |  |  |
Unrealized appreciation (decline) in value of investments: |  |  |  |  |
Unrealized holding gains (losses) arising during period | $ | (187) |  |  | $ | (20) |  |  | $ | (167) |
Less reclassification of net realized gains (losses) included in net income | (94) |  |  | (12) |  |  | (82) |
Foreign currency translation adjustments | (49) |  |  | — |  |  | (49) |
Other comprehensive income (loss) | $ | (142) |  |  | $ | (8) |  |  | $ | (134) |

X
- Definition Comprehensive Income Note Disclosure [Abstract] + References No definition available. + Details
Name: | acgl_ComprehensiveIncomeNoteDisclosureAbstract
Namespace Prefix: | acgl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration