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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data
Sep. 30, 2011
Dec. 31, 2010
Fixed Maturities  
Tax exempt, Cost$ 18,879$ 19,072
Taxable, Cost16,33715,989
Equity securities, Cost$ 1,271$ 1,285
Shareholders' Equity  
Common Stock, Par Value$ 1$ 1
Common Stock, Shares Issued371,980,460371,980,460
Treasury Stock, Shares93,908,73574,707,547