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Insider Trading Arrangements	3 Months Ended	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023 shares	Dec. 31, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
John J. Lupica [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 20, 2023, John J. Lupica, Vice Chairman, Chubb Group, and President, North America Insurance, adopted a "Rule 10b5-1 trading arrangement" as defined under Item 408 of SEC Regulation S-K. The trading arrangement provides for (i) the sale of up to 8,985 shares of Chubb's common stock and (ii) the potential exercise of 25,479 stock options expiring December 20, 2025, and the associated sale of up to 25,479 shares of Chubb's common stock. The arrangement is scheduled to expire on December 20, 2025, subject to earlier termination in accordance with its terms, or upon the completion of all authorized transactions under the plan.
Name	John J. Lupica
Title	Vice Chairman, Chubb Group, and President, North America Insurance
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 20, 2023
Aggregate Available	8,985	8,985
John J. Lupica Options expiring December 20, 2025 [Abstract] \| John J. Lupica [Member]
Trading Arrangements, by Individual
Aggregate Available	25,479	25,479
John J. Lupica Common Stock From Option Exercise Expiring December 20 2025 [Member] \| John J. Lupica [Member]
Trading Arrangements, by Individual
Aggregate Available	25,479	25,479