Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 122,300	$ 120,737
Variable Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	31,408	29,141	$ 23,771	$ 22,184
Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	25,162	25,355	24,019	23,365
UL and Other
Policyholder Account Balance [Line Items]
Policyholder account balances	37,006	37,180	37,533	37,694
Retirement Plan Services
Policyholder Account Balance [Line Items]
Policyholder account balances	23,586	23,784	$ 24,994	$ 25,138
Other
Policyholder Account Balance [Line Items]
Policyholder account balances	5,138	5,277
Other | Reinsurance Agreement
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 4,700	$ 4,900