Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 135,683	$ 136,245
Variable Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	39,143	40,060	$ 34,370	$ 35,267
Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	28,974	28,728	26,039	25,963
UL and Other
Policyholder Account Balance [Line Items]
Policyholder account balances	35,723	35,986	36,220	36,599
Retirement Plan Services
Policyholder Account Balance [Line Items]
Policyholder account balances	23,694	23,843	$ 23,479	$ 23,619
Other
Policyholder Account Balance [Line Items]
Policyholder account balances	8,149	7,628
Other | Funding Agreement Backed Notes Program | Sustainable Financing | The Lincoln National Life Insurance Company
Policyholder Account Balance [Line Items]
Policyholder account balances	4,400	3,700
Other | Reinsurance Agreement
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 3,500	$ 3,500