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Background and Business Description AMPS Exchange (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | May 01, 2013
--- | --- | --- | ---
Stockholders' Equity Attributable to Noncontrolling Interest | $ 60 | $ 60 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 16.67
Preferred Stock, Shares Outstanding | 0 | 0 |
Ambac Assurance Corporation [Member] |  |  |
Preferred Stock, Liquidation Preference, Value | $ 138 | $ 138 |
Preferred Stock, Shares Outstanding | 5,501 | 5,501 |

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