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Shareholders' Equity - Comparison of Shareholders' Equity on GAAP Basis and Policyholders' Surplus on Statutory Basis (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis      
Shareholders' equity $ 16,097 $ 15,827 $ 15,301
P&C Group [Member]
     
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis      
Shareholders' equity 17,398 16,833  
Policyholders' surplus 15,024 14,117  
Corporate and Other [Member]
     
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis      
Shareholders' equity $ (1,301) $ (1,006)