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Investments (Changes In The Valuation Allowance Of Impaired Mortgage Loans On Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Losses
Balance as of beginning-of-period	$ 2	$ 2	$ 2	$ 2
Additions		1		1
Charge-offs, net of recoveries
Balance as of end-of-period	$ 2	$ 3	$ 2	$ 3

X

- Definition

Additions to the valuation allowance relating to impaired mortgage loans on real estate.

+ References

No definition available.

+ Details

Name:	lnc_AllowanceAdditionOfImpairedMortgageLoansOnRealEstate
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

N/A

+ References

No definition available.

+ Details

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

X

- Definition

Charge offs, net of recoveries, of impaired mortgage loans on real estate.

+ References

No definition available.

+ Details

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

X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant