Policyholder Account Balances - Narrative (Details) - FABN - Sustainable Financing - The Lincoln National Life Insurance Company - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Policyholder Account Balance [Line Items]
Debt instrument, face amount	$ 5,000,000,000
Long-term debt	$ 500,000,000	$ 0

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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