Policyholder Account Balances - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Policyholder Account Balance [Line Items]
Long-term debt	$ 5,969	$ 5,866
Funding Agreement Backed Notes Program | The Lincoln National Life Insurance Company | Federal Home Loan Bank
Policyholder Account Balance [Line Items]
Long-term debt	$ 1,700	1,500
Debt, term	1 year
Funding Agreement Backed Notes Program | Sustainable Financing | The Lincoln National Life Insurance Company
Policyholder Account Balance [Line Items]
Debt instrument, face amount			$ 5,000
Long-term debt	$ 1,900	1,500
Funding Agreement Backed Notes Program | Sustainable Financing | The Lincoln National Life Insurance Company | Minimum
Policyholder Account Balance [Line Items]
Debt, term	3 years
Funding Agreement Backed Notes Program | Sustainable Financing | The Lincoln National Life Insurance Company | Maximum
Policyholder Account Balance [Line Items]
Debt, term	5 years
Funding Agreement Backed Notes Program | Secured Debt | The Lincoln National Life Insurance Company
Policyholder Account Balance [Line Items]
Debt instrument, face amount	$ 800	$ 800
Debt, term	5 years