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Claim and Claim Adjustment Expense Reserves - Reconciliation of Claim and Claim Adjustment Expense Reserves (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Gross reserves, beginning of year $ 24,089l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross $ 24,763l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross $ 24,303l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross
Ceded reserves, beginning of year 4,972l_CededClaimAndClaimAdjustmentExpenses 5,126l_CededClaimAndClaimAdjustmentExpenses 5,020l_CededClaimAndClaimAdjustmentExpenses
Net reserves, beginning of year 19,117us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 19,637us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 19,283us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Change in net reserves due to acquisition (disposition) of subsidiaries (13)l_ReductionOfNetReservesDueToSaleOfSubsidiary   291l_ReductionOfNetReservesDueToSaleOfSubsidiary
Net incurred claim and claim adjustment expenses:      
Provision for insured events of current year 5,043l_CurrentYearClaimsAndClaimsAdjustmentExpense 5,114l_CurrentYearClaimsAndClaimsAdjustmentExpense 5,273l_CurrentYearClaimsAndClaimsAdjustmentExpense
Decrease in provision for insured events of prior years (36)l_PriorYearClaimsAndClaimsAdjustmentExpense (115)l_PriorYearClaimsAndClaimsAdjustmentExpense (182)l_PriorYearClaimsAndClaimsAdjustmentExpense
Amortization of discount 161l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount 154l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount 145l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount
Total net incurred 5,168us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 5,153us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 5,236us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net payments attributable to:      
Current year events (945)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 (981)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 (988)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior year events (4,355)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 (4,588)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 (4,280)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Total net payments (5,300)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (5,569)us-gaap_PaymentsForLossesAndLossAdjustmentExpense (5,268)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Foreign currency translation adjustment and other (45)l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCta (104)l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCta 95l_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCta
Net reserves, end of year 18,927us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 19,117us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 19,637us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Ceded reserves, end of year 4,344l_CededClaimAndClaimAdjustmentExpenses 4,972l_CededClaimAndClaimAdjustmentExpenses 5,126l_CededClaimAndClaimAdjustmentExpenses
Gross reserves, end of year $ 23,271l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross $ 24,089l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross $ 24,763l_LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross