Policyholders' Account Balances - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 164,088	$ 140,788
FANIP \| Medium-term Notes
Policyholder Account Balance [Line Items]
Capacity	15,000
Debt Instrument, Face Amount	$ 3,969	3,465
FANIP \| Medium-term Notes \| Minimum
Policyholder Account Balance [Line Items]
Interest rate	0.00%
Maturities	2 months
FANIP \| Medium-term Notes \| Maximum
Policyholder Account Balance [Line Items]
Maturities	7 years
FANIP \| Commercial paper
Policyholder Account Balance [Line Items]
Capacity	$ 6,000
Debt Instrument, Face Amount	$ 2,127	2,389
FANIP \| Commercial paper \| Minimum
Policyholder Account Balance [Line Items]
Interest rate	0.00%
Maturities	2 months
FANIP \| Commercial paper \| Maximum
Policyholder Account Balance [Line Items]
Interest rate	5.60%
Maturities	7 years
FHLBNY \| Secured Debt
Policyholder Account Balance [Line Items]
Maturities	7 years
Debt Instrument, Face Amount	$ 2,628	2,628
FHLBNY \| Secured Debt \| Minimum
Policyholder Account Balance [Line Items]
Interest rate	1.925%
FHLBNY \| Secured Debt \| Maximum
Policyholder Account Balance [Line Items]
Interest rate	4.51%
Institutional Retirement Strategies And Life Planner
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 6,061	$ 5,811

Face (par) amount of debt instrument at time of issuance.

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