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Accounting Pronouncements Not Yet Adopted (Details Textual) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Accounting Pronouncements Not Yet Adopted (Textual) [Abstract] 
Expected minimum percentage reduction of deferred policy acquisition costs due to the adoption of new accounting guidance22.00%
Expected maximum percentage reduction of deferred policy acquisition costs due to the adoption of new accounting guidance27.00%
Expected minimum reduction to shareholders' equity due to the adoption of new accounting guidance$ 250
Expected maximum reduction to shareholders' equity due to the adoption of new accounting guidance$ 300