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DAC, VOBA, DSI, and DFEL (VOBA) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in VOBA [Roll Forward] |  |  |  |
Balance as of beginning-of-year |  | $ 816 | $ 516 | $ 891
Business acquired (sold) through reinsurance |  |  | (11) |
Business acquired |  |  | 30 |
Deferrals |  | 6 | 7 | 7
Amortization: |  |  |  |
Amortization, excluding unlocking |  | (114) | (127) | (105)
Unlocking |  | 140 | (60) | (48)
Accretion of interest | [1] | 45 | 48 | 52
Adjustment related to realized (gains) losses |  | (1) | (2) | (1)
Adjustment related to unrealized (gains) losses |  | (550) | 415 | (280)
Balance as of end-of-year |  | $ 342 | $ 816 | $ 516
Interest accrual rate, low end |  | 4.20% | 4.20% | 4.20%
Interest accrual rate, high end |  | 6.90% | 6.90% | 6.90%
[1] | The interest accrual rates utilized to calculate the accretion of interest ranged from 4.2% to 6.9%.

X
- Definition States the assumed long-term market interest rate used in the determination of the present value of future profits on long-duration contracts acquired in a business combination, high end of range. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition States the assumed long-term market interest rate used in the determination of the present value of future profits on long-duration contracts acquired in a business combination, low end of range. + References No definition available. + Details
Name: | lnc_InterestAccrualRateAssociatedWithAmortizationMethodOfPresentValueOfFutureInsuranceProfitsLowEnd
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- Definition Amount of addition (disposition) for present value of future profits of insurance contract acquired (sold) in business combination. + References No definition available. + Details
Name: | lnc_PresentValueOfFutureInsuranceProfitsAdditionDispositionFromAcquisition
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of adjustment to amortization of the present value of future profits asset arising from a revision in estimated gross profit (when such amount serves as the basis for allocating amortization of VOBA to reporting periods). + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of amortization of the present value of future profits asset due to realized investment gains (losses). + References No definition available. + Details
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Namespace Prefix: | lnc_
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Period Type: | duration

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- Definition Amount of amortization of the present value of future profits asset due to unrealized investment gains (losses). + References No definition available. + Details
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Period Type: | duration

X
- Definition Total amount of additions in present value of future profits asset from sources other than acquisitions of insurance entities during the income statement period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other amortization of the present value of future profits asset during the period. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of addition for present value of future profits of insurance contract acquired in business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- References No definition available. + Details
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- Definition Amount of amortization expense for present value of future profits of insurance contract acquired in business combination from accrued interest on unamortized balance. + References No definition available. + Details
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X
- Definition Amount, after accumulated amortization, of present value of future profits of insurance contract acquired in business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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