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Background and Business Description Rehabilitation Exit Support Agreement (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 29, 1991 | Dec. 31, 2017 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 30, 2013
Preferred Stock, Shares Outstanding |  |  | 0 | 0 |
Common stock, shares authorized |  |  | 130,000,000 | 130,000,000 |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01
Preferred stock, shares authorized |  |  | 20,000,000 | 20,000,000 |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  | $ 0.01
Common stock, shares issued |  |  | 46,659,144 | 46,658,990 |
Common Stock Voting Restrictions | 10.00% |  |  |  |
Common Stock Voting Restriction Less One Vote | 10.00% |  |  |  |
Common Stock Transfer Restrictions | 5.00% |  |  |  |
Common Stock Additional Transfer Restrictions |  | 5.00% |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | $ 53 | $ 53 |
Ambac Assurance Corporation [Member] |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 4,596 | 4,596 |
Preferred Stock, Liquidation Preference, Value |  |  | $ 115 | $ 115 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | $ 51 |  |

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