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Effects of Reinsurance on Premiums Written and Earned (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reinsurance [Abstract]      
Direct, Written $ 6,226us-gaap_DirectPremiumsWritten $ 5,922us-gaap_DirectPremiumsWritten $ 5,952us-gaap_DirectPremiumsWritten
Assumed, Written 635us-gaap_AssumedPremiumsWritten 431us-gaap_AssumedPremiumsWritten 455us-gaap_AssumedPremiumsWritten
Ceded, Written (1,239)us-gaap_CededPremiumsWritten (1,169)us-gaap_CededPremiumsWritten (1,350)us-gaap_CededPremiumsWritten
Net premiums, Written 5,622us-gaap_PremiumsWrittenNet 5,184us-gaap_PremiumsWrittenNet 5,057us-gaap_PremiumsWrittenNet
Direct, Earned 6,029us-gaap_DirectPremiumsEarned 5,852us-gaap_DirectPremiumsEarned 5,873us-gaap_DirectPremiumsEarned
Assumed, Earned 630us-gaap_AssumedPremiumsEarned 455us-gaap_AssumedPremiumsEarned 489us-gaap_AssumedPremiumsEarned
Ceded, Earned (1,228)us-gaap_CededPremiumsEarned (1,159)us-gaap_CededPremiumsEarned (1,321)us-gaap_CededPremiumsEarned
Net premiums, Earned 5,431us-gaap_PremiumsEarnedNet 5,148us-gaap_PremiumsEarnedNet 5,041us-gaap_PremiumsEarnedNet
Percentage of amount assumed to net 12.00%us-gaap_PremiumsPercentageAssumedToNet 9.00%us-gaap_PremiumsPercentageAssumedToNet 10.00%us-gaap_PremiumsPercentageAssumedToNet
Life insurance      
Reinsurance [Abstract]      
Direct, Written 1,241us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
1,199us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
1,284us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Assumed, Written 45us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
9us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
9us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Ceded, Written (351)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(342)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(528)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Direct, Earned 1,257us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
1,214us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
1,304us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Assumed, Earned 39us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
8us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
7us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Ceded, Earned (351)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(343)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(527)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Accident and Health Insurance Product Line      
Reinsurance [Abstract]      
Direct, Written 3,063us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
2,944us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
2,853us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Assumed, Written 568us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
403us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
419us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Ceded, Written (790)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
(735)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
(690)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Direct, Earned 3,087us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
2,945us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
2,840us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Assumed, Earned 559us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
414us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
440us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Ceded, Earned (783)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
(725)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
(672)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember
Property, Liability and Casualty Insurance Product Line      
Reinsurance [Abstract]      
Direct, Written 108us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
97us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
95us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Assumed, Written 2us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Ceded, Written (3)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Direct, Earned 97us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
85us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
84us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Assumed, Earned 1us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Ceded, Earned (3)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Mortgage insurance      
Reinsurance [Abstract]      
Direct, Written 1,814us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
1,682us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
1,720us-gaap_DirectPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Assumed, Written 20us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
19us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
27us-gaap_AssumedPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Ceded, Written (95)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
(92)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
(132)us-gaap_CededPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Direct, Earned 1,588us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
1,608us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
1,645us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Assumed, Earned 31us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
33us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
42us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
Ceded, Earned $ (91)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
$ (91)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember
$ (122)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_FinancialGuaranteeInsuranceSegmentMember