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DAC, VOBA, DSI, and DFEL (DFEL) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in DFEL [Abstract]
Balance as of beginning-of-year	$ 650	$ 2,769	$ 1,445
Deferrals	1,003	1,095	875
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(538)	(544)	(482)
Unlocking	(275)	(426)	(53)
Adjustment related to realized (gains) losses	25		(20)
Adjustment related to unrealized (gains) losses	(468)	(2,244)	1,004
Balance as of end-of-year	401	$ 650	$ 2,769
Cumulative Effect, Period of Adoption, Adjustment [Member]
Amortization, net of interest:
Balance as of end-of-year	$ 4

X

- Definition

The unamortized carrying amount of deferred front end loads as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	lnc_DeferredFrontEndLoads
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deferred front end loads capitalized during the period.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of adjustment to amortization of deferred front end loads arising from a revision in estimated gross profit (when such amount serves as the basis for allocating amortization of DFEL to reporting periods).

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of amortization of deferred front end loads attributable to realized investment gains (losses).

+ References

No definition available.

+ Details

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

X

- Definition

The amount of other amortization of deferred front end loads, net of interest, during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of amortization of deferred front end loads attributable to unrealized investment gains (losses).

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: