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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Collateral Posted by Counter-Party (Held by LNC) $ 2,051lnc_CollateralPostedByCounterpartyHeldByEntity $ 1,534lnc_CollateralPostedByCounterpartyHeldByEntity
Collateral Posted by LNC (Held by Counter-Party) 173lnc_CollateralPostedByEntityHeldByCounterParty 85lnc_CollateralPostedByEntityHeldByCounterParty
AA- [Member]    
Collateral Posted by Counter-Party (Held by LNC) 177lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAMinusRatingMember		 64lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAMinusRatingMember
Collateral Posted by LNC (Held by Counter-Party)      
A plus [Member]    
Collateral Posted by Counter-Party (Held by LNC) 56lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAPlusRatingMember		 47lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAPlusRatingMember
Collateral Posted by LNC (Held by Counter-Party)      
A [Member]    
Collateral Posted by Counter-Party (Held by LNC) 1,489lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember		 1,163lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember
Collateral Posted by LNC (Held by Counter-Party) 99lnc_CollateralPostedByEntityHeldByCounterParty
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember		 85lnc_CollateralPostedByEntityHeldByCounterParty
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember
A- [Member]    
Collateral Posted by Counter-Party (Held by LNC) 309lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAMinusRatingMember		 233lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAMinusRatingMember
Collateral Posted by LNC (Held by Counter-Party) 74lnc_CollateralPostedByEntityHeldByCounterParty
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAMinusRatingMember		   
BBB+ [Member]    
Collateral Posted by Counter-Party (Held by LNC) 20lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember		 27lnc_CollateralPostedByCounterpartyHeldByEntity
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
Collateral Posted by LNC (Held by Counter-Party)