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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, 2014	Dec. 31, 2013	Dec. 31, 2012
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis
Shareholders' equity	$ 16,296us-gaap_StockholdersEquity	$ 16,097us-gaap_StockholdersEquity	$ 15,827us-gaap_StockholdersEquity
P&C Group [Member]
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis
Shareholders' equity	17,786	17,398
Policyholders' surplus	15,127	15,024
Corporate and Other [Member]
Comparison of shareholders' equity on a GAAP basis and policyholders' surplus on a statutory basis
Shareholders' equity	$ (1,490)	$ (1,301)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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