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Statutory Information and Restrictions (Net Gain Loss From Operations, Net Income Loss, Dividends to LNC Holding Company) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statutory Information and Restrictions [Abstract] |  |  |
U.S. net gain (loss) from operations, after-tax | $ 409 | $ 692 | $ 1,329
U.S. net income (loss) | 388 | 1,019 | 1,468
U.S. dividends to LNC holding company | $ 600 | $ 925 | $ 974

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- Definition This element represents dividends paid to the common parent company by its domestic life insurance subsidiaries. + References No definition available. + Details
Name: | lnc_DividendsToParentCompany
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of net gain from operations, after tax, for the period determined using accounting principles prescribed or permitted by insurance regulators. + References No definition available. + Details
Name: | lnc_StatutoryAccountingPracticesStatutoryNetGainFromOperationsAfterTaxAmount
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition n/a + References No definition available. + Details
Name: | lnc_StatutoryInformationAndRestrictionsDisclosureAbstract
Namespace Prefix: | lnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: 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(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration