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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale securities, at fair value:    
Fixed maturity securities (amortized cost) $ 80,230us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost $ 78,609us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
Variable interest entities' fixed maturity securities (amortized cost) 588lnc_VariableInterestEntitiesFixedMaturitySecuritiesAmortizedCost 587lnc_VariableInterestEntitiesFixedMaturitySecuritiesAmortizedCost
Equity securities (cost) $ 192us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 216us-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) 252,928,502us-gaap_CommonStockSharesIssued 256,551,440us-gaap_CommonStockSharesIssued
Common stock - shares outstanding (in shares) 252,928,502us-gaap_CommonStockSharesOutstanding 256,551,440us-gaap_CommonStockSharesOutstanding