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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Collateral Posted by Counter-Party (Held by LNC) | $ 922 | $ 894
Collateral Posted by LNC (Held by Counter-Party) | (489) | (630)
AA- [Member] |  |
Collateral Posted by Counter-Party (Held by LNC) | 74 | 53
Collateral Posted by LNC (Held by Counter-Party) |  | (32)
A plus [Member] |  |
Collateral Posted by Counter-Party (Held by LNC) | 32 | 10
Collateral Posted by LNC (Held by Counter-Party) | (212) | (217)
A [Member] |  |
Collateral Posted by Counter-Party (Held by LNC) | 495 | 466
Collateral Posted by LNC (Held by Counter-Party) | (277) | (381)
A- [Member] |  |
Collateral Posted by Counter-Party (Held by LNC) | 59 | 67
Collateral Posted by LNC (Held by Counter-Party) |  |
BBB+ [Member] |  |
Collateral Posted by Counter-Party (Held by LNC) | 262 | 298
Collateral Posted by LNC (Held by Counter-Party) |  |

X
- Definition Cash collateral held by the entity that was obligated to be returned to the counterparty. + References No definition available. + Details
Name: | lnc_CollateralPostedByCounterpartyHeldByEntity
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash collateral held by the counterparty in which the entity had the right to reclaim. + References No definition available. + Details
Name: | lnc_CollateralPostedByEntityHeldByCounterParty
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsAAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsAPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsBBBPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |