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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]        
Fixed Maturities, cost $ 36,958us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 35,959us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Equity Securities, cost $ 1,089us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 1,057us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis    
Preferred Stock, Shares Authorized 8,000,000us-gaap_PreferredStockSharesAuthorized 8,000,000us-gaap_PreferredStockSharesAuthorized    
Preferred Stock, Par Value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare    
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued    
Common Stock, Shares Authorized 1,200,000,000us-gaap_CommonStockSharesAuthorized 1,200,000,000us-gaap_CommonStockSharesAuthorized    
Common Stock, Par Value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare    
Common Stock, Shares Issued 371,980,460us-gaap_CommonStockSharesIssued 371,980,460us-gaap_CommonStockSharesIssued    
Treasury Stock, Shares 139,551,071us-gaap_TreasuryStockShares 123,673,969us-gaap_TreasuryStockShares 110,217,445us-gaap_TreasuryStockShares 99,519,509us-gaap_TreasuryStockShares