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Short-Term and Long-Term Debt (Credit Facilities and Letters of Credit) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items] |
Maximum Available | $ 4,403
LOCs issued | $ 1,861
Five-year revolving credit facility [Member] |
Line of Credit Facility [Line Items] |
Expiration Date | Jun. 19, 2026
Maximum Available | $ 2,500
LOCs issued | $ 15
LOC facility due August 2031 [Member] |
Line of Credit Facility [Line Items] |
Expiration Date | Aug. 26, 2031
Maximum Available | $ 983
LOCs issued | $ 926
LOC facility due October 2031 [Member] |
Line of Credit Facility [Line Items] |
Expiration Date | Oct. 01, 2031
Maximum Available | $ 920
LOCs issued | $ 920

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- Definition Amount of letters of credit issued under credit facilities as of the balance-sheet date. + References No definition available. + Details
Name: | lnc_LettersOfCreditIssued
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=lnc_FiveYearRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=lnc_LineOfCreditFacilityDueAugust2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=lnc_LineOfCreditFacilityDueOctober2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |