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Condensed Financial Information of Parent Company - Statements of Cash Flows (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities      
Net Income $ 2,100us-gaap_NetIncomeLoss $ 2,345us-gaap_NetIncomeLoss $ 1,545us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Used in Operating Activities      
Realized Investment Losses (Gains), Net (369)us-gaap_GainLossOnInvestments (402)us-gaap_GainLossOnInvestments (193)us-gaap_GainLossOnInvestments
Other, Net (47)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (26)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 7us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
NET CASH PROVIDED BY OPERATING ACTIVITIES 2,153us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 1,731us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,299us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities      
Proceeds from Fixed Maturities - Sales 4,229us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt 2,449us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt 2,271us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions 4,231us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 4,909us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 4,290us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from Sales of Equity Securities 213us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 545us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 160us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Purchases of Fixed Maturities (9,987)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt (8,275)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt (7,247)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Investments in Other Invested Assets, Net 315us-gaap_PaymentsForProceedsFromLimitedPartnership 498us-gaap_PaymentsForProceedsFromLimitedPartnership 293us-gaap_PaymentsForProceedsFromLimitedPartnership
Decrease in Short Term Investments, Net 780us-gaap_PaymentsForProceedsFromShortTermInvestments 383us-gaap_PaymentsForProceedsFromShortTermInvestments (629)us-gaap_PaymentsForProceedsFromShortTermInvestments
Other, Net   (6)us-gaap_PaymentsForProceedsFromOtherInvestingActivities  
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES (156)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 252us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (972)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities      
Repayment of Long Term Debt   (275)us-gaap_RepaymentsOfLongTermDebt  
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans 22us-gaap_ProceedsFromStockPlans 38us-gaap_ProceedsFromStockPlans 74us-gaap_ProceedsFromStockPlans
Repurchase of Shares (1,547)us-gaap_PaymentsForRepurchaseOfCommonStock (1,288)us-gaap_PaymentsForRepurchaseOfCommonStock (959)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends Paid to Shareholders (475)us-gaap_PaymentsOfDividendsCommonStock (450)us-gaap_PaymentsOfDividendsCommonStock (438)us-gaap_PaymentsOfDividendsCommonStock
NET CASH USED IN FINANCING ACTIVITIES (2,002)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,981)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,335)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net Increase (Decrease) in Cash (5)us-gaap_CashPeriodIncreaseDecrease 2us-gaap_CashPeriodIncreaseDecrease (8)us-gaap_CashPeriodIncreaseDecrease
Cash at Beginning of Year 52us-gaap_Cash 50us-gaap_Cash 58us-gaap_Cash
CASH AT END OF YEAR 47us-gaap_Cash 52us-gaap_Cash 50us-gaap_Cash
Parent Company [Member]      
Cash Flows from Operating Activities      
Net Income 2,100us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,345us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,545us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to Reconcile Net Income to Net Cash Used in Operating Activities      
Equity in Net Income of Consolidated Subsidiaries (2,326)cb_EquityInNetIncomeOfConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,485)cb_EquityInNetIncomeOfConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,787)cb_EquityInNetIncomeOfConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Realized Investment Losses (Gains), Net (4)us-gaap_GainLossOnInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(99)us-gaap_GainLossOnInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6us-gaap_GainLossOnInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, Net 9us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
57us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
NET CASH PROVIDED BY OPERATING ACTIVITIES (221)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(218)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(179)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Investing Activities      
Proceeds from Fixed Maturities - Sales 382us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
227us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions 46us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
150us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
673us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from Sales of Equity Securities 2us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
296us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Purchases of Fixed Maturities (551)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(198)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,046)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investments in Other Invested Assets, Net   22us-gaap_PaymentsForProceedsFromLimitedPartnership
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Decrease in Short Term Investments, Net 282us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
85us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
89us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends Received from Consolidated Insurance Subsidiaries 2,021cb_CashDividendsPaidToParentCompanyByConsolidatedInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,564cb_CashDividendsPaidToParentCompanyByConsolidatedInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,760cb_CashDividendsPaidToParentCompanyByConsolidatedInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Distributions Received from Consolidated Non-Insurance Subsidiaries 1cb_CashDividendsPaidToParentCompanyByConsolidatedNonInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1cb_CashDividendsPaidToParentCompanyByConsolidatedNonInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1cb_CashDividendsPaidToParentCompanyByConsolidatedNonInsuranceSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, Net 38us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
46us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 2,221us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,193us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,502us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Financing Activities      
Repayment of Long Term Debt   (275)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans 22us-gaap_ProceedsFromStockPlans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
38us-gaap_ProceedsFromStockPlans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
74us-gaap_ProceedsFromStockPlans
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repurchase of Shares (1,547)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,288)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(959)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends Paid to Shareholders (475)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(450)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(438)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
NET CASH USED IN FINANCING ACTIVITIES (2,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,975)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,323)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Increase (Decrease) in Cash         
Cash at Beginning of Year         
CASH AT END OF YEAR