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Reinsurance - Effect 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
Insurance [Abstract]      
Direct premiums written $ 12,976us-gaap_DirectPremiumsWritten $ 12,804us-gaap_DirectPremiumsWritten $ 12,647us-gaap_DirectPremiumsWritten
Assumed reinsurance 596us-gaap_AssumedPremiumsWritten 503us-gaap_AssumedPremiumsWritten 423us-gaap_AssumedPremiumsWritten
Ceded reinsurance (980)us-gaap_CededPremiumsWritten (1,083)us-gaap_CededPremiumsWritten (1,200)us-gaap_CededPremiumsWritten
Net premiums written 12,592us-gaap_PremiumsWrittenNet 12,224us-gaap_PremiumsWrittenNet 11,870us-gaap_PremiumsWrittenNet
Direct premiums earned 12,776us-gaap_DirectPremiumsEarned 12,717us-gaap_DirectPremiumsEarned 12,596us-gaap_DirectPremiumsEarned
Assumed reinsurance 562us-gaap_AssumedPremiumsEarned 476us-gaap_AssumedPremiumsEarned 422us-gaap_AssumedPremiumsEarned
Ceded reinsurance (1,010)us-gaap_CededPremiumsEarned (1,127)us-gaap_CededPremiumsEarned (1,180)us-gaap_CededPremiumsEarned
Net premiums earned $ 12,328us-gaap_PremiumsEarnedNet $ 12,066us-gaap_PremiumsEarnedNet $ 11,838us-gaap_PremiumsEarnedNet