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Background and Business Description AMPS Exchange (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Stockholders' Equity Attributable to Noncontrolling Interest | $ 53 | $ 53
Preferred Stock, Shares Outstanding | 0 | 0
Ambac Assurance Corporation [Member] |  |
Preferred Stock, Liquidation Preference, Value | $ 115 | $ 115
Stockholders' Equity Attributable to Noncontrolling Interest | $ 51 |
Preferred Stock, Shares Outstanding | 4,596 | 4,596

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