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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale securities, at fair value:    
Fixed maturity securities (amortized cost: 2014 - $78,609; 2013 - $76,353) $ 78,609us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost $ 76,353us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
Variable interest entities' fixed maturity securities (amortized cost: 2014 - $587; 2013 - $682) 587lnc_VariableInterestEntitiesFixedMaturitySecuritiesAmortizedCost 682lnc_VariableInterestEntitiesFixedMaturitySecuritiesAmortizedCost
Equity securities (cost: 2014 - $216; 2013 - $182) $ 216us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 182us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Stockholders Equity    
Preferred stock - shares authorized (in shares) 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Common stock - shares authorized (in shares) 800,000,000us-gaap_CommonStockSharesAuthorized 800,000,000us-gaap_CommonStockSharesAuthorized
Common stock - shares issued (in shares) 256,551,440us-gaap_CommonStockSharesIssued 262,896,701us-gaap_CommonStockSharesIssued
Common stock - shares outstanding (in shares) 256,551,440us-gaap_CommonStockSharesOutstanding 262,896,701us-gaap_CommonStockSharesOutstanding