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Statutory Information and Restrictions (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Statutory Information and Restrictions [Abstract] |
Current Period Increase In Reserves | $ 450
Increase In Reserves Each Year Over Remaining Years | $ 90
RBC Ratio Company Action Level Low End | 75.00%
RBC Ratio Company Action Level High End | 100.00%
Indiana Statutory Limitation As A Percentage of The Insurer Contract Holder Surplus | 10.00%
New York Statutory Limitation As A Percentage of The Insurer Contract Holder Surplus | 10.00%
Amount of dividends that could be paid in the next year without prior approval | $ 1,300

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- Definition The current year increase in reserves. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The maximum expected increase each year over the rest of the expected five-year phase-in. + References No definition available. + Details
Name: | lnc_IncreaseInReservesEachYearOverRemainingYears
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition In the event that LNL pays dividends to LNC that exceed the lesser of this percentage of the insurer's contract holders' surplus or the insurer’s net gain from operations over the previous 12 months, it must receive prior approval from the Indiana Insurance Commissioner. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition LLANY, a NY-domiciled insurance company, may not pay out the lesser of this percentage of surplus as of the immediately preceding calendar year or net gain from operations for the immediately preceding calendar year to contract holders, not including realized capital gains, without permission from the New York Insurance Commissioner. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | instant

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- Definition The high end of the risk-based capital percentage range that requires an insurer to submit a plan to the regulator detailing corrective action it proposes to undertake + References No definition available. + Details
Name: | lnc_RbcRatioCompanyActionLevelHighEnd
Namespace Prefix: | lnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The low end of the risk-based capital percentage range that requires an insurer to submit a plan to the regulator detailing corrective action it proposes to undertake + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | num:percentItemType
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Period Type: | instant

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- Definition n/a + References No definition available. + Details
Name: | lnc_StatutoryInformationAndRestrictionsDisclosureAbstract
Namespace Prefix: | lnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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