Long-Term Debt - Subordinated Debt (Details) - Parent Company - Subordinated Debt - Fixed Rate 8.25% Notes Due 2038 $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument
Issue of senior notes to third party investors	$ 1,000
Interest rate (as a percent)	8.25%
Amount of debt converted to floating rate	$ 705
Derivative, basis spread on a variable rate	3.31%
Derivative, variable interest rate	8.20%