Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 124,892	$ 125,818
Variable Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	34,370	35,267	$ 31,408	$ 29,141
Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholder account balances	26,018	25,941	25,137	25,330
UL and Other
Policyholder Account Balance [Line Items]
Policyholder account balances	35,871	36,242	36,622	36,784
Retirement Plan Services
Policyholder Account Balance [Line Items]
Policyholder account balances	23,479	23,619	$ 23,586	$ 23,784
Other
Policyholder Account Balance [Line Items]
Policyholder account balances	5,154	4,749
Other | Reinsurance Agreement
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 4,300	$ 4,400