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Policyholder Account Balances - Narrative (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Long-term debt | $ 5,868,000,000 | $ 5,856,000,000
FABN | Sustainable Financing | The Lincoln National Life Insurance Company |  |
Policyholder Account Balance [Line Items] |  |
Debt instrument, face amount | 5,000,000,000 |
Long-term debt | $ 500,000,000 | $ 0

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