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Invested Assets and Related Income - Realized Investment Gains and Losses (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]      
Fixed maturities, Gross realized gains $ 126cb_GrossRealizedGainsFixedMaturities $ 62cb_GrossRealizedGainsFixedMaturities $ 124cb_GrossRealizedGainsFixedMaturities
Fixed maturities, Gross realized losses (36)cb_GrossRealizedLossesFixedMaturities (42)cb_GrossRealizedLossesFixedMaturities (20)cb_GrossRealizedLossesFixedMaturities
Fixed maturities, Other-than-temporary impairment losses (5)cb_ImpairmentOfInvestmentsFixedMaturities (2)cb_ImpairmentOfInvestmentsFixedMaturities (5)cb_ImpairmentOfInvestmentsFixedMaturities
Total fixed maturities 85cb_GrossGainLossOttiFixedMaturities 18cb_GrossGainLossOttiFixedMaturities 99cb_GrossGainLossOttiFixedMaturities
Equity securities, Gross realized gains 137cb_GrossRealizedGainsEquitySecurities 204cb_GrossRealizedGainsEquitySecurities 68cb_GrossRealizedGainsEquitySecurities
Equity securities, Gross realized losses   (1)cb_GrossRealizedLossesEquitySecurities  
Equity securities, Other-than-temporary impairment losses (2)cb_ImpairmentOfInvestmentsEquitySecurities (9)cb_ImpairmentOfInvestmentsEquitySecurities (40)cb_ImpairmentOfInvestmentsEquitySecurities
Total equity securities 135cb_GrossGainLossEquitySecurities 194cb_GrossGainLossEquitySecurities 28cb_GrossGainLossEquitySecurities
Other invested assets 149cb_OtherInvestedAssetsGainLoss 190cb_OtherInvestedAssetsGainLoss 66cb_OtherInvestedAssetsGainLoss
Total Realized Investment Gains, Net $ 369us-gaap_GainLossOnInvestments $ 402us-gaap_GainLossOnInvestments $ 193us-gaap_GainLossOnInvestments