Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Investments [Abstract]
Collateral payable for derivative investments	$ (2,210)	$ 2,462
Securities pledged under securities lending agreements	(2)	(3)
Securities pledged under repurchase agreements	418	0
Investments pledged for FHLBI	240	550
Total increase (decrease) in payables for collateral on investments	$ (1,554)	$ 3,009

- Definition

The net change during the reporting period in the amount of cash that is received related to collateral payable held for derivative instruments.

+ References

No definition available.

+ Details

Name:	lnc_IncreaseDecreaseInCashCollateralForDerivativeInvestments
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase (Decrease) In Cash Collateral For Reverse Repurchase Agreements

+ References

No definition available.

+ Details

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

- Definition

The net change during the reporting period in the amount of cash that is received related to securities pledged under securities lending agreements.

+ References

No definition available.

+ Details

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

- Definition

The net change during the reporting period in the amount of cash that is received related to securities pledged for Federal Home Loan Bank of Indianapolis.

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No definition available.

+ Details

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

- Definition

The increase (decrease) during the reporting period in the amount that is received as security when loaning securities.

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No definition available.

+ Details

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

- References

No definition available.

+ Details

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Period Type:	duration