Debt Notes and Debentures (Details) $ in Millions	Sep. 30, 2024 USD ($)
SEC Debt Shelf Registration
Debt Instrument [Line Items]
Remaining Debt Securities Authorized by the Board	$ 1,650
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated notes related to financial covenants	500
Five Point Five Percent Due March 15, 2055 | Corporate Debt Securities
Debt Instrument [Line Items]
Debt issuance, face amount	$ 1,300
Debt instrument, stated interest rate	5.50%