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Share-Based Compensation (Detail) - $ / shares |  | 6 Months Ended
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Feb. 25, 2021 | Jun. 30, 2021
Chubb Limited Amended 2016 Long-Term Incentive Plan | Common Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 13,400,000
Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period in years |  | 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  | 3 years
Award term period in years |  | 10 years
Stock options granted | 1,790,057 |
Weighted-average grant date fair value for stock options granted | $ 33.05 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period in years |  | 4 years
Restricted stock awards granted to employees and officers of the company | 848,762 |
Grant date fair value of awards except for options granted to employees and officers of the company | $ 164.94 |
Performance Shares [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period in years |  | 3 years
Restricted stock awards granted to employees and officers of the company | 284,766 |
Grant date fair value of awards except for options granted to employees and officers of the company | $ 164.94 |
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period in years |  | 4 years
Restricted stock awards granted to employees and officers of the company | 324,142 |
Grant date fair value of awards except for options granted to employees and officers of the company | $ 164.94 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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