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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