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Adoption of New Accounting Pronouncements (Details Textual) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Adoption of New Accounting Pronouncements (Textual) [Abstract]  
Decrease in deferred policy acquisition costs due to the adoption of new accounting guidance $ 420
Decrease in deferred income tax liabilities due to the adoption of new accounting guidance 147
Decrease in shareholders' equity due to the adoption of new accounting guidance $ 273