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Derivative Instruments (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Derivative Instruments [Abstract] |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 8
Exposure Associated With Collateralization Events | $ 4

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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 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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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