Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 125,579	$ 120,316
Variable Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	34,344	29,141	$ 26,772	$ 22,184
Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	26,336	25,330	23,655	23,338
UL and Other
Policyholder Account Balance [Line Items]
Policyholder account balances	36,327	36,784	36,810	37,258
Retirement Plan Services
Policyholder Account Balance [Line Items]
Policyholder account balances	23,727	23,784	$ 24,099	$ 25,138
Other
Policyholder Account Balance [Line Items]
Policyholder account balances	4,845	5,277
Other | Reinsurance Agreement
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 4,500	$ 4,900