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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Millions, except Per Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets    
Fixed maturities, at amortized cost $ 15,170 $ 14,257
Equity Securities, at cost $ 124 $ 124
Common stock par value $ 0.25 $ 0.25
Common stock shares issued 366 351
Common Stock, Shares Authorized 600