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Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year $ 17,031lnc_RemainingLifeLessThan1Year
Remaining Life - 1 - 5 Years 45,414lnc_RemainingLife1To5Years
Remaining Life - 6 - 10 Years 15,898lnc_RemainingLife6To10Years
Remaining Life - 11 - 30 Years 13,025lnc_RemainingLife11To30Years
Remaining Life Over - 30 Years 1,405lnc_RemainingLifeOver30Years
Remaining Life - Total Years 92,773invest_DerivativeNotionalAmount
Interest Rate Contract [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year 2,480lnc_RemainingLifeLessThan1Year
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Remaining Life - 1 - 5 Years 39,859lnc_RemainingLife1To5Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Remaining Life - 6 - 10 Years 11,284lnc_RemainingLife6To10Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Remaining Life - 11 - 30 Years 12,797lnc_RemainingLife11To30Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Remaining Life Over - 30 Years 1,213lnc_RemainingLifeOver30Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Remaining Life - Total Years 67,633invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Derivative maturity date Apr. 01, 2067
Foreign Currency Contract [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year 38lnc_RemainingLifeLessThan1Year
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [2]
Remaining Life - 1 - 5 Years 126lnc_RemainingLife1To5Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [2]
Remaining Life - 6 - 10 Years 276lnc_RemainingLife6To10Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [2]
Remaining Life - 11 - 30 Years 210lnc_RemainingLife11To30Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [2]
Remaining Life Over - 30 Years    [2]
Remaining Life - Total Years 650invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [2]
Derivative maturity date Dec. 01, 2029
Equity Market Contract [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year 14,513lnc_RemainingLifeLessThan1Year
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Remaining Life - 1 - 5 Years 5,303lnc_RemainingLife1To5Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Remaining Life - 6 - 10 Years 4,338lnc_RemainingLife6To10Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Remaining Life - 11 - 30 Years 18lnc_RemainingLife11To30Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Remaining Life Over - 30 Years 192lnc_RemainingLifeOver30Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Remaining Life - Total Years 24,364invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
Credit Risk Contract [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year   
Remaining Life - 1 - 5 Years 126lnc_RemainingLife1To5Years
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
Remaining Life - 6 - 10 Years   
Remaining Life - 11 - 30 Years   
Remaining Life Over - 30 Years   
Remaining Life - Total Years $ 126invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
[1] As of March 31, 2015, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2067.
[2] As of March 31, 2015, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was December 2029.