Debt Notes and Debentures (Details) $ in Millions	Sep. 30, 2023 USD ($)
SEC Debt Shelf Registration
Debt Instrument [Line Items]
The board of managers authorized additional debt securities for issuance	$ 3,000
Remaining Debt Securities Authorized by the Board	2,950
Junior Subordinated Debt
Debt Instrument [Line Items]
Subordinated notes related to financial covenants	500
Five Point Two Percent Due April 15, 2054 | Corporate Debt Securities
Debt Instrument [Line Items]
Debt issuance, face amount	$ 1,600
Debt instrument, stated interest rate	5.20%