Debt Notes and Debentures (Details) $ in Millions	Sep. 30, 2025 USD ($)
SEC Debt Shelf Registration
Debt Instrument [Line Items]
Additional Debt Securities authorized for issuance by the Board of Directors	$ 3,000
Remaining Debt Securities Authorized by the Board	3,750
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated notes related to financial covenants	500
Five Point Eight Percent Due March 15, 2056 | Corporate Debt Securities
Debt Instrument [Line Items]
Debt issuance, face amount	$ 900
Debt instrument, stated interest rate	5.80%