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v3.24.0.1

Basis of Presentation and Significant Accounting Policies Noncontrolling Interest (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) shares | Jun. 30, 2023 | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest | $ 53 |  | $ 53 | $ 53 |
Preferred Stock, Shares Outstanding | shares | 0 |  | 0 | 0 |
Redeemable Noncontrolling Interest, Equity, Carrying Amount | $ 17 |  | $ 17 | $ 20 | $ 18
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value | 2 |  | 2 | 5 |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest |  |  | 1 | 1 |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | (2) | (1) |
Temporary Equity, Accretion to Redemption Value, Adjustment |  |  | (5) | $ (3) |
AMPS Shares Purchased |  |  |  | (905) |
AMPS Gain Based on Carry Value |  |  |  | $ 1 |
AMPS Purchase Cash Paid |  |  |  | $ 8 |
Ambac Assurance Corporation [Member] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ 51 |  | $ 51 |  |
Preferred Stock, Shares Outstanding | shares | 4,596 |  | 4,596 | 4,596 |
Preferred Stock, Liquidation Preference, Value | $ 115 |  | $ 115 | $ 115 |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Dividend Rate on Auction Rate Preferred Shares |  | 20000.00% |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |
Dividend Rate on Auction Rate Preferred Shares | 11.448% |  |  |  |

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