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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
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statutory Information and Restrictions [Abstract]
U.S. net gain (loss) from operations, after-tax	$ (271)	$ 409	$ 692
U.S. net income (loss)	29	388	1,019
U.S. dividends to LNC holding company	$ 660	$ 600	$ 925

X

- 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

X

- 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

X

- 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