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Cover
Jan. 14, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 14, 2020
Entity File Number 1-11778
Entity Registrant Name CHUBB LIMITED
Entity Central Index Key 0000896159
Entity Tax Identification Number 98-0091805
Entity Incorporation, State or Country Code V8
Entity Address, Address Line One Baerengasse 32
Entity Address, City or Town Zurich
Entity Address, Country CH
Entity Address, Postal Zip Code 8001
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
Title of 12(b) Security Common Shares, par value CHF 24.15 per share
Trading Symbol CB
Security Exchange Name NYSE
Entity Emerging Growth Company false