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Derivative Instruments (Narrative) (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 6,000,000 |
Cash flow hedge, reclassified to earnings, net | 0 | $ 0
Exposure Associated With Collateralization Events | 4,000,000 |
Maximum [Member] |  |
Collateral Requirement If Netting Agreements Not In Place | 1,000,000 |
Non-performance Risk Adjustment | $ 1,000,000 |

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- Definition Cash flow hedge, reclassified to earnings, net + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of collateral that would have been required to be posted as of the balance sheet date if contractual provisions that allow for netting of collateral with counterparties related to collateralized financing transactions were not in place. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of exposure associated with collateral support agreements in certain transactions that require the posting of collateral when net exposures exceed predetermined thresholds. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit, or nonperformance, risk adjustment associated with credit loss in the event of nonperformance by our counterparties on various derivative contracts. + References No definition available. + Details
Name: | lnc_NonPerformanceRiskAdjustment
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Details
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