XML 121 R105.htm IDEA: XBRL DOCUMENT v3.25.4

Income Taxes - Statutory tax rate by jurisdiction (Details)	12 Months Ended
	Dec. 31, 2025
Australia
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	30.00%
Canada
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	25.70%
United Kingdom
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	25.00%
United States
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	21.00%
Switzerland
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	19.60%
Bermuda
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	15.00%
Gibraltar
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	15.00%
Ireland
Income Tax Disclosure [Line Items]
Statutory tax rate (percentage)	12.50%

X

- Definition

[Line Items] for Income Tax Disclosure [Table]

+ References

No definition available.

+ Details

Name:	acgl_IncomeTaxDisclosureLineItems
Namespace Prefix:	acgl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The applicable statutory tax rate for each jurisdiction in which the Company is subject to tax.

+ References

No definition available.

+ Details

Name:	acgl_StatutoryTaxRatePercentage
Namespace Prefix:	acgl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_AU
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_CH
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_BM
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_GI
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_IE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: