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Basis of Presentation and Significant Accounting Policies Noncontrolling Interest (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
Stockholders' Equity Attributable to Noncontrolling Interest | $ 60 | $ 60
Preferred Stock, Shares Outstanding | shares | 0 | 0
Redeemable Noncontrolling Interest, Equity, Carrying Amount | $ 18 | $ 7
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | $ 7
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (1) |
Temporary Equity, Accretion to Redemption Value, Adjustment | $ 12 |
Ambac Assurance Corporation [Member] |  |
Preferred Stock, Shares Outstanding | shares | 5,501 | 5,501
Preferred Stock, Liquidation Preference, Value | $ 138 | $ 138
London Interbank Offered Rate (LIBOR) [Member] |  |
Dividend Rate on Auction Rate Preferred Shares | 200 |

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