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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Notional amount of future obligations under Chubb Financial Solutions' (CFS) derivative contracts $ 55invest_DerivativeNotionalAmount $ 80invest_DerivativeNotionalAmount
Fair value of future obligations under Chubb Financial Solutions' derivative contracts 2us-gaap_DerivativeLiabilities 2us-gaap_DerivativeLiabilities
Year through which office facilities under lease agreements will expire 2029  
Office facility leases renewal options in years, Lower end of range 2 years  
Office facility leases renewal options in years, Higher end of range 10 years  
Commitments to fund limited partnership investments $ 860cb_CommitmentsToFundLimitedPartnershipInvestments  
Period for which commitments can be called by the partnerships 5 years or less