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	$ 135,349	$ 135,904
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	28,956	28,710	26,018	25,941
UL and Other
Policyholder Account Balance [Line Items]
Policyholder account balances	35,407	35,663	35,871	36,242
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 | FABN | Sustainable Financing
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