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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, 2017 USD ($)
Line of Credit Facility [Line Items] |  |
Credit Facilities | Total |
Maximum Available | $ 4,863 |
LOCs issued | $ 2,596 |
Five-year revolving credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facilities | Five-year revolving credit facility |
Expiration Date | Jun. 30, 2021 |
Maximum Available | $ 2,500 |
LOCs issued | $ 281 |
LOC facility due December 2019 [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facilities | LOC facility | [1]
Expiration Date | Dec. 06, 2019 | [1]
Maximum Available | $ 350 | [1]
LOCs issued | $ 350 | [1]
LOC facility due August 2031 [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facilities | LOC facility | [1]
Expiration Date | Aug. 26, 2031 | [1]
Maximum Available | $ 990 | [1]
LOCs issued | $ 945 | [1]
LOC facility due October 2031 [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit Facilities | LOC facility | [1]
Expiration Date | Oct. 01, 2031 | [1]
Maximum Available | $ 1,023 | [1]
LOCs issued | $ 1,020 | [1]
[1] | Our wholly-owned subsidiaries entered into irrevocable LOC facility agreements with third-party lenders supporting inter-company reinsurance agreements.

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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 Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6877327&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
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Data Type: | na
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Period Type: |

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

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- 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: |
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