Document and Entity Information
Apr. 21, 2020
Cover [Abstract]  
Entity Registrant Name Chubb Ltd
Amendment Flag false
Entity Central Index Key 0000896159
Document Type 8-K
Document Period End Date Apr. 21, 2020
Entity Incorporation State Country Code V8
Entity File Number 1-11778
Entity Tax Identification Number 98-0091805
Entity Address, Address Line One Baerengasse 32
Entity Address, Postal Zip Code 8001
Entity Address, City or Town Zurich
Entity Address, Country CH
City Area Code 41 (0)43
Local Phone Number 456 76 00
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Shares, par value CHF 24.15 per share
Trading Symbol CB
Security Exchange Name NYSE
Entity Emerging Growth Company false