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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, 2015 | Dec. 31, 2021 | Dec. 31, 2020 | May 01, 2013 | Apr. 30, 2013
Preferred Stock, Shares Outstanding |  |  | 0 | 0 |  |
Entity Incorporation, Date of Incorporation | Apr. 29, 1991 |  |  |  |  |
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 |  |  | 46,477,068 | 45,865,081 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 16.67 |
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 |  |  | $ 60 | $ 60 |  |
Market Value of Secured Note Collateral |  |  | $ 0 | $ 178 |  |
Ambac Assurance Corporation [Member] |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 5,501 | 5,501 |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 138 | $ 138 |  |
Long-term Debt [Member] |  |  |  |  |  |
Gain Contingency, Unrecorded Amount |  |  | $ 1,400 |  |  |

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