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Invested Assets and Related Income - Fair Value and Amortized Cost of Foreign Government and Government Agency Fixed Maturities (Detail) (Foreign Government and Government Agency Obligations [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Canada [Member]
    
Schedule of Available-For-Sale Securities [Line Items]    
Fair Value $ 1,893cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 $ 1,993cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_CA
Amortized Cost 1,823cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 1,953cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_CA
United Kingdom [Member]
    
Schedule of Available-For-Sale Securities [Line Items]    
Fair Value 1,230cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_GB		 1,026cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_GB
Amortized Cost 1,163cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_GB		 1,004cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_GB
Germany [Member]
    
Schedule of Available-For-Sale Securities [Line Items]    
Fair Value 1,102cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_DE		 1,241cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_DE
Amortized Cost 1,045cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_DE		 1,211cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_DE
Australia [Member]
    
Schedule of Available-For-Sale Securities [Line Items]    
Fair Value 746cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_AU		 739cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_AU
Amortized Cost 700cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_AU		 700cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_AU
Brazil [Member]
    
Schedule of Available-For-Sale Securities [Line Items]    
Fair Value 232cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_BR		 270cb_FairValueForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_BR
Amortized Cost $ 231cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_BR		 $ 270cb_AmortizedCostForeignGovernmentAndGovernmentAgencyFixedMaturitiesForFiveCountriesHavingLargestConcentrationOfIssuersWithinForeignGovernmentAndGovernmentAgencyFixedMaturityPortfolio
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtMember
/ us-gaap_StatementGeographicalAxis
= country_BR