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Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity | The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at September 30, 2024, by contractual maturity, were as follows:
|  | Amortized Cost |  | Estimated Fair Value
Due in one year or less |  | $ | 441 |  |  | $ | 439 |
Due after one year through five years |  | 510 |  |  | 498 |
Due after five years through ten years |  | 307 |  |  | 289 |
Due after ten years |  | 177 |  |  | 176 |
|  | 1,436 |  |  | 1,402 |
Residential mortgage-backed securities |  | 255 |  |  | 281 |
Commercial mortgage-backed securities |  | 24 |  |  | 24 |
Collateralized debt obligations |  | 113 |  |  | 113 |
Other asset-backed securities |  | 242 |  |  | 252 |
Total |  | $ | 2,069 |  |  | $ | 2,073 |
Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments | The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, excluding VIE investments, which at September 30, 2024 and December 31, 2023, did not have an allowance for credit losses This information is aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at September 30, 2024 and December 31, 2023:
|  | September 30, 2024 |  | December 31, 2023
|  | Less Than 12 Months |  | 12 Months or More |  | Total |  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 3 |  |  | $ | — |  |  | $ | 15 |  |  | $ | 1 |  |  | $ | 18 |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 16 |  |  | $ | 1 |  |  | $ | 23 |  |  | $ | 1 |
Corporate obligations |  | 118 |  |  | 3 |  |  | 448 |  |  | 30 |  |  | 566 |  |  | 34 |  |  | 75 |  |  | 2 |  |  | 509 |  |  | 43 |  |  | 584 |  |  | 44 |
Foreign obligations |  | 16 |  |  | — |  |  | 52 |  |  | 6 |  |  | 68 |  |  | 6 |  |  | 8 |  |  | — |  |  | 56 |  |  | 6 |  |  | 64 |  |  | 6 |
U.S. government obligations |  | 18 |  |  | 1 |  |  | 24 |  |  | 1 |  |  | 43 |  |  | 2 |  |  | 27 |  |  | 1 |  |  | 37 |  |  | 2 |  |  | 63 |  |  | 4 |
Residential mortgage-backed securities |  | 7 |  |  | — |  |  | 102 |  |  | 4 |  |  | 109 |  |  | 5 |  |  | 6 |  |  | — |  |  | 98 |  |  | 14 |  |  | 104 |  |  | 14 |
Commercial mortgage-backed securities |  | 4 |  |  | — |  |  |  |  | — |  |  | 4 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |
Collateralized debt obligations |  | 28 |  |  | — |  |  | — |  |  | — |  |  | 28 |  |  | — |  |  | 1 |  |  | — |  |  | 93 |  |  | 1 |  |  | 95 |  |  | 1 |
Other asset-backed securities |  | 40 |  |  | 1 |  |  | 73 |  |  | 1 |  |  | 114 |  |  | 2 |  |  | 57 |  |  | 1 |  |  | 35 |  |  | 1 |  |  | 92 |  |  | 1 |
|  | 234 |  |  | 6 |  |  | 714 |  |  | 43 |  |  | 949 |  |  | 49 |  |  | 184 |  |  | 4 |  |  | 844 |  |  | 68 |  |  | 1,028 |  |  | 71 |
Short-term |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |
|  | 235 |  |  | 6 |  |  | 714 |  |  | 43 |  |  | 949 |  |  | 49 |  |  | 187 |  |  | 4 |  |  | 844 |  |  | 68 |  |  | 1,032 |  |  | 71 |
U. S. government obligations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total collateralized investments |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total temporarily impaired securities |  | $ | 235 |  |  | $ | 6 |  |  | $ | 714 |  |  | $ | 43 |  |  | $ | 949 |  |  | $ | 49 |  |  | $ | 187 |  |  | $ | 4 |  |  | $ | 844 |  |  | $ | 68 |  |  | $ | 1,032 |  |  | $ | 71 |
Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments | The following table details amounts included in net investment gains (losses) and impairments included in earnings for the affected periods:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Gross realized gains on securities |  | $ | 4 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 1 |
Gross realized losses on securities |  | (1) |  |  | (1) |  |  | (2) |  |  | (4) |
Foreign exchange gains (losses) |  | (5) |  |  | 2 |  |  | (6) |  |  | (2) |
Credit impairments |  | — |  |  | (1) |  |  | (1) |  |  | (2) |
Intent / requirement to sell impairments |  | — |  |  | — |  |  | — |  |  | — |
Net investment gains (losses), including impairments |  | $ | (1) |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | (7) |
Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities | The following table represents the fair value and weighted-average underlying rating of insured securities in Ambac's investment portfolio at September 30, 2024 and December 31, 2023, respectively:
| September 30, 2024 |  | December 31, 2023
Municipal obligations | $ | 8 |  |  | $ | 9 |
Mortgage-backed securities | 258 |  |  | 240 |
Asset-backed securities | 154 |  |  | 232 |
Total | $ | 421 |  |  | 482 |
Weighted average underlying rating | B- |  | B-
(1)Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.
Equity Method Investments [Table Text Block] | In addition to these investments, Ambac has unfunded commitments of $26 to private credit and private equity funds at September 30, 2024.
|  | Fair Value |  |  |  |
Class of Funds |  | September 30, 2024 |  | December 31, 2023 |  | Redemption Frequency |  | Redemption Notice Period
Hedge funds (1) |  | $ | 87 |  |  | $ | 112 |  |  | quarterly or semi-annually |  | 90 days
Private credit (2) |  | 84 |  |  | 84 |  |  | quarterly if permitted |  | 180 days if permitted
High yields and leveraged loans (3) (10) |  | 134 |  |  | 85 |  |  | daily |  | 0 - 30 days
Equity market investments (4) (10) |  | 67 |  |  | 38 |  |  | daily |  | 0 days
Investment grade floating rate income (5) |  | 57 |  |  | 52 |  |  | weekly |  | 0 days
Private equity (6) |  | 81 |  |  | 70 |  |  | quarterly if permitted |  | 90 days if permitted
Real estate properties (7) |  | — |  |  | 21 |  |  | see footnote (7) |  | see footnote (7)
Convertible bonds (8)(10) |  | 26 |  |  | — |  |  | daily |  | 0 days
Insurance-linked investments (9) |  | — |  |  | 1 |  |  | see footnote (9) |  | see footnote (9)
Total equity investments in pooled funds |  | $ | 535 |  |  | $ | 463 |  |  |  |  |
(1)This class seeks to generate superior risk-adjusted returns through selective asset sourcing, active trading and hedging strategies across a range of asset types. (2)This class aims to obtain high long-term returns primarily through credit and preferred equity investments with low liquidity and defined term. (3)This class of funds includes investments in a range of instruments including high-yield bonds, leveraged loans, CLOs, ABS and floating rate notes to generate income and capital appreciation. (4)This class of funds aim to achieve long term growth through diversified exposure to global equity-markets. (5)This class of funds includes investments in high quality floating rate debt securities including ABS and corporate floating rate notes. (6)This class seeks to generate long-term capital appreciation through investments in private equity, equity-related and other instruments. (7)Investments consisted of UK property to generate income and capital growth. The fund in which Ambac was invested has terminated on May 30, 2024 and is in the process of distributing remaining capital. Amounts owed Ambac from the fund are included in Other assets on the Consolidated Balance Sheet as of September 30, 2024. (8)This class seeks to generate total returns from portfolios focused primarily on convertible securities. (9)This class seeks to generate returns from insurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments. This investment was restricted in connection with the unwind of certain insurance linked exposures. Ambac's investment was fully redeemed by March 31, 2024. (10)These categories include fair value amounts totaling $174 and $77 at September 30, 2024 and December 31, 2023, respectively, that are readily determinable and are priced through pricing vendors, including for Equity market investments $67 and $38, High yield and leveraged loans products $82 and $39, and Convertible bonds investments $26 and $0.
Summary of Net Investment Income | Net investment income (loss) was comprised of the following for the affected periods:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Fixed maturity securities |  | $ | 22 |  |  | $ | 20 |  |  | $ | 67 |  |  | $ | 55 |
Short-term investments |  | 4 |  |  | 5 |  |  | 14 |  |  | 16 |
Investment expense |  | (1) |  |  | (1) |  |  | (4) |  |  | (4) |
Securities available-for-sale and short-term |  | 24 |  |  | 24 |  |  | 77 |  |  | 67 |
Fixed maturity securities - trading |  | — |  |  | — |  |  | 4 |  |  | 5 |
Other investments |  | 14 |  |  | 6 |  |  | 35 |  |  | 28 |
Total net investment income (loss) |  | $ | 38 |  |  | $ | 30 |  |  | $ | 116 |  |  | $ | 100 |
Debt Securities, Available-for-Sale | The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at September 30, 2024 and December 31, 2023, were as follows:
|  | September 30, 2024: |  | December 31, 2023:
|  | Amortized Cost |  | Allowance for Credit Losses (2) |  | Gross Unrealized |  | Estimated Fair Value |  | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized |  | Estimated Fair Value
|  |  |  | Gains |  | Losses |  |  |  |  | Gains |  | Losses |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 83 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 84 |  |  | $ | 72 |  |  | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 72 |
Corporate obligations |  | 808 |  |  | — |  |  | 5 |  |  | 34 |  |  | 779 |  |  | 785 |  |  | — |  |  | 4 |  |  | 44 |  |  | 745 |
Foreign obligations |  | 120 |  |  | — |  |  | 1 |  |  | 6 |  |  | 115 |  |  | 105 |  |  | — |  |  | 1 |  |  | 6 |  |  | 100 |
U.S. government obligations |  | 92 |  |  | — |  |  | 1 |  |  | 2 |  |  | 91 |  |  | 85 |  |  | — |  |  | 1 |  |  | 4 |  |  | 82 |
Residential mortgage-backed securities |  | 255 |  |  | 1 |  |  | 32 |  |  | 5 |  |  | 281 |  |  | 239 |  |  | 3 |  |  | 28 |  |  | 14 |  |  | 250 |
Commercial mortgage-backed securities |  | 24 |  |  | — |  |  | — |  |  | — |  |  | 24 |  |  | 19 |  |  | — |  |  | — |  |  | — |  |  | 19 |
Collateralized debt obligations |  | 113 |  |  | — |  |  | 1 |  |  | — |  |  | 113 |  |  | 139 |  |  | — |  |  | 1 |  |  | 1 |  |  | 139 |
Other asset-backed securities (1) |  | 242 |  |  | — |  |  | 13 |  |  | 2 |  |  | 252 |  |  | 301 |  |  | — |  |  | 3 |  |  | 1 |  |  | 303 |
|  | 1,737 |  |  | 1 |  |  | 54 |  |  | 49 |  |  | 1,740 |  |  | 1,744 |  |  | 3 |  |  | 40 |  |  | 71 |  |  | 1,710 |
Short-term |  | 305 |  |  | — |  |  | — |  |  | — |  |  | 305 |  |  | 426 |  |  | — |  |  | — |  |  | — |  |  | 426 |
|  | 2,042 |  |  | 1 |  |  | 54 |  |  | 49 |  |  | 2,046 |  |  | 2,170 |  |  | 3 |  |  | 40 |  |  | 71 |  |  | 2,135 |
Fixed maturity securities pledged as collateral: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government obligations |  | 27 |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Short-term |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | — |  |  | — |  |  | 27 |
|  | 27 |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | — |  |  | 27 |
Total available-for-sale investments |  | $ | 2,069 |  |  | $ | 1 |  |  | $ | 54 |  |  | $ | 49 |  |  | $ | 2,073 |  |  | $ | 2,197 |  |  | 3 |  |  | $ | 40 |  |  | $ | 71 |  |  | $ | 2,162 |
(1)Consists primarily of military housing and student loan securities. (2)For the three and nine months ended September 30, 2024, the allowance for credit losses changed by $— and $— respectively on residential mortgage-backed securities for which credit losses were not previously recorded.

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