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Commissions and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details underlying commissions and other expenses [Abstract]
Commissions	$ 2,183	$ 2,549	$ 2,256
General and administrative expenses	2,072	2,210	1,953
Expenses associated with reserve financing and unrelated LOCs	94	88	84
DAC and VOBA deferrals and interest, net of amortization	(156)	(540)	(402)
Broker-dealer expenses	493	481	465
Specifically identifiable intangible asset amortization	37	26	9
Taxes, licenses and fees	321	343	313
Acquisition and integration costs related to mergers and acquisitions	20	130	85
Total	$ 5,064	$ 5,287	$ 4,763

X

- Definition

Commissions, general and administrative, and taxes, licenses and fees expense related to broker dealers.

+ References

No definition available.

+ Details

Name:	lnc_BrokerDealerExpenses
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Additions during the period in capitalized costs that are directly related to the successful acquisition of new and renewal insurance contracts and coverages and value of business acquired, including interest, net of the amount of DAC and VOBA that was amortized during the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.

+ References

No definition available.

+ Details

Name:	lnc_DacAndVobaDeferralsAndInterestNetOfAmortization
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Details underlying commissions and other expenses [Abstract]

+ References

No definition available.

+ Details

Name:	lnc_DetailsUnderlyingCommissionsAndOtherExpensesAbstract
Namespace Prefix:	lnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents merger-related expenses that were the result of actions undertaken by the entity to eliminate duplicate operations and functions as a result of a merger along with costs related to the implementation of a new unified product portfolio and other initiatives.

+ References

No definition available.

+ Details

Name:	lnc_MergerRelatedExpenses
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate expense charged against earnings to allocate the cost of other intangible assets not otherwise specified in the taxonomy (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

No definition available.

+ Details

Name:	lnc_OtherIntangiblesAmortization
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Expenses associated with reserve financing supporting secondary guarantee UL and term business, and expenses for unrelated letters of credit.

+ References

No definition available.

+ Details

Name:	lnc_ReserveFinancingExpenses
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of tax incurred and cost of license directly related to good produced or service rendered.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The expense incurred by an insurance company to persons or entities for generating or placing insurance or investment contracts with the company, usually determined as a percentage of policy or contract premiums. Excludes advances or draws to be applied against commissions earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.7(a))
-URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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