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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	$ 935	$ 894
Collateral Posted by LNC (Held by Counter-Party)	(570)	(630)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	103	53
Collateral Posted by LNC (Held by Counter-Party)		(32)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	28	10
Collateral Posted by LNC (Held by Counter-Party)	(258)	(217)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	500	466
Collateral Posted by LNC (Held by Counter-Party)	(309)	(381)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	52	67
Collateral Posted by LNC (Held by Counter-Party)
BBB+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	252	298
Collateral Posted by LNC (Held by Counter-Party)	$ (3)

X

- Definition

Cash collateral held by the entity that was obligated to be returned to the counterparty.

+ References

No definition available.

+ Details

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

X

- Definition

Cash collateral held by the counterparty in which the entity had the right to reclaim.

+ References

No definition available.

+ Details

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Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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- Details

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- Details

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- Details

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- Details

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