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Basis of Presentation and Significant Accounting Policies Noncontrolling Interest (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest | $ 53 | $ 60 |
Preferred Stock, Shares Outstanding | shares | 0 | 0 |
Redeemable Noncontrolling Interest, Equity, Carrying Amount | $ 20 | $ 18 | $ 7
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value | 5 | 0 |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (1) | (1) |
Temporary Equity, Accretion to Redemption Value, Adjustment | $ (3) | $ 12 |
AMPS Shares Purchased | (905) |  |
AMPS Gain Based on Carry Value | $ 1 |  |
AMPS Purchase Cash Paid | $ 8 |  |
Ambac Assurance Corporation [Member] |  |  |
Preferred Stock, Shares Outstanding | shares | 4,596 | 5,501 |
Preferred Stock, Liquidation Preference, Value | $ 115 | $ 138 |
Xchange |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 80.00% |  |
Capacity Marine |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 80.00% |  |
All Trans |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 85.00% |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Dividend Rate on Auction Rate Preferred Shares | 200 |  |

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