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Investments (Schedule Of Increase (Decrease) In Payables For Collateral On Investments) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Increase (decrease) in payables for collateral on investments |  |
Collateral payable for derivative investments | $ (786) | $ 246
Securities pledged under securities lending agreements | 17 | 29
Investments pledged for FHLBI | 750 | 1,100
Total increase (decrease) in payables for collateral on investments | $ (19) | $ 1,375

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- Definition The net change during the reporting period in the amount of cash that is received related to collateral payable held for derivative instruments. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCashCollateralForDerivativeInvestments
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net change during the reporting period in the amount of cash that is received related to securities pledged under securities lending agreements. + 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 net change during the reporting period in the amount of cash that is received related to securities pledged for Federal Home Loan Bank of Indianapolis. + 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 increase (decrease) during the reporting period in the amount that is received as security when loaning securities. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCollateralForLoanedSecurities
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | lnc_IncreaseDecreaseInPayablesForCollateralOnInvestmentsAbstract
Namespace Prefix: | lnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration