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DAC, VOBA, DSI, and DFEL - DFEL (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Changes in DFEL [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 5,901 |  |
Amortization | (311) | $ (288) | $ (257)
Balance as of beginning-of-year | 6,730 | 5,901 |
UL and Other |  |  |
Changes in DFEL [Roll Forward] |  |  |
Balance as of beginning-of-year | 5,579 | 4,766 |
Deferrals | 1,114 | 1,074 |
Amortization | (287) | (261) |
Balance as of beginning-of-year | 6,406 | 5,579 | 4,766
Less: reinsurance recoverables | 256 | 257 |
Balance as of end-of-year, net of reinsurance | 6,150 | 5,322 |
Variable Annuities |  |  |
Changes in DFEL [Roll Forward] |  |  |
Balance as of beginning-of-year | 278 | 286 |
Deferrals | 19 | 19 |
Amortization | (24) | (27) |
Balance as of beginning-of-year | 273 | 278 | $ 286
Less: reinsurance recoverables | 0 | 0 |
Balance as of end-of-year, net of reinsurance | $ 273 | $ 278 |

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- Definition Ceded Deferred Front End Loads + 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 unamortized carrying amount of deferred front end loads as of the balance sheet date. + References No definition available. + Details
Name: | lnc_DeferredFrontEndLoads
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of deferred front end loads capitalized during the period. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of other amortization of deferred front end loads, net of interest, during the period. + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
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- Definition Deferred Front End Loads, Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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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Namespace Prefix: | lnc_
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Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_VariableAnnuityMember
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Balance Type: |
Period Type: |