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Adoption of New Accounting Pronouncements
12 Months Ended
Dec. 31, 2011
Adoption of New Accounting Pronouncements [Abstract]  
Adoption of New Accounting Pronouncements
(2)  Adoption of New Accounting Pronouncements
 
Effective April 1, 2009, the Corporation adopted new guidance issued by the FASB related to the recognition and presentation of other-than-temporary impairments. The FASB modified the guidance on the recognition of other-than-temporary impairments of debt securities. Under this guidance, an entity is required to recognize an other-than-temporary impairment when the entity concludes it has the intent to sell or it is more likely than not the entity will be required to sell an impaired debt security before the security recovers to its amortized cost value or it is likely the entity will not recover the entire amortized cost value of an impaired debt security. This guidance also changed the presentation in the financial statements of other-than-temporary impairments and provides for enhanced disclosures of both debt and equity securities. Under this guidance, if an entity has the intent to sell or it is more likely than not the entity will be required to sell an impaired debt security before the security recovers to its amortized cost value, the security is written down to fair value and the entire amount of the writedown is included in net income as a realized investment loss. For all other impaired debt securities, the impairment loss is separated into the amount representing the credit loss and the amount representing the loss related to all other factors. The portion of the impairment loss that represents the credit loss is included in net income as a realized investment loss and the amount representing the loss that relates to all other factors is included in other comprehensive income. This guidance required a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption with a corresponding adjustment to accumulated other comprehensive income. The cumulative effect adjustment from adopting this guidance resulted in a $30 million increase to retained earnings and a corresponding decrease to accumulated other comprehensive income. The adoption of this guidance did not have a significant effect on the Corporation’s financial position or results of operations.