Policyholder Account Balances - Narrative (Details) - FABN - The Lincoln National Life Insurance Company - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Sustainable Financing
Policyholder Account Balance [Line Items]
Debt instrument, face amount	$ 5,000
Long-term debt	1,500	$ 0
Secured Debt
Policyholder Account Balance [Line Items]
Debt instrument, face amount	$ 400

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

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+ Details