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Investments (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments | The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at June 30, 2020 and December 31, 2019, were as follows:
|  | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains in AOCI |  | Gross Unrealized Losses in AOCI |  | Estimated Fair Value
June 30, 2020: |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 317 |  |  | $ | — |  |  | $ | 17 |  |  | $ | 3 |  |  | $ | 330 |
Corporate obligations (1) |  | 1,010 |  |  | — |  |  | 34 |  |  | 7 |  |  | 1,037 |
Foreign obligations |  | 74 |  |  | — |  |  | 1 |  |  | — |  |  | 75 |
U.S. government obligations |  | 118 |  |  | — |  |  | 6 |  |  | — |  |  | 123 |
Residential mortgage-backed securities |  | 258 |  |  | — |  |  | 34 |  |  | 1 |  |  | 291 |
Commercial mortgage-backed securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Collateralized debt obligations |  | 74 |  |  | — |  |  | — |  |  | 2 |  |  | 73 |
Other asset-backed securities |  | 275 |  |  | — |  |  | 20 |  |  | 7 |  |  | 288 |
|  | 2,126 |  |  | — |  |  | 112 |  |  | 20 |  |  | 2,218 |
Short-term |  | 691 |  |  | — |  |  | — |  |  | — |  |  | 692 |
|  | 2,817 |  |  | — |  |  | 113 |  |  | 20 |  |  | 2,910 |
Fixed income securities pledged as collateral: |  |  |  |  |  |  |  |  |  |
Short-term |  | 155 |  |  | — |  |  | — |  |  | — |  |  | 155 |
Total collateralized investments |  | 155 |  |  | — |  |  | — |  |  | — |  |  | 155 |
Total available-for-sale investments |  | $ | 2,972 |  |  | $ | — |  |  | $ | 113 |  |  | $ | 20 |  |  | $ | 3,065 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Non-credit Other-than temporary Impairments (2)
December 31, 2019: |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 194 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 215 |  |  | $ | — |
Corporate obligations (1) |  | 1,396 |  |  | 36 |  |  | 2 |  |  | 1,430 |  |  | — |
Foreign obligations |  | 44 |  |  | 1 |  |  | — |  |  | 44 |  |  | — |
U.S. government obligations |  | 157 |  |  | 2 |  |  | 2 |  |  | 156 |  |  | — |
Residential mortgage-backed securities |  | 200 |  |  | 47 |  |  | — |  |  | 248 |  |  | — |
Commercial mortgage-backed securities |  | 49 |  |  | 1 |  |  | — |  |  | 50 |  |  | — |
Collateralized debt obligations |  | 147 |  |  | — |  |  | 1 |  |  | 146 |  |  | — |
Other asset-backed securities |  | 263 |  |  | 24 |  |  | — |  |  | 287 |  |  | — |
|  | 2,450 |  |  | 132 |  |  | 5 |  |  | 2,577 |  |  | — |
Short-term |  | 653 |  |  | — |  |  | — |  |  | 653 |  |  | — |
|  | 3,103 |  |  | 132 |  |  | 5 |  |  | 3,230 |  |  | — |
Fixed income securities pledged as collateral: |  |  |  |  |  |  |  |  |  |
Short-term |  | 85 |  |  | — |  |  | — |  |  | 85 |  |  | — |
Total collateralized investments |  | 85 |  |  | — |  |  | — |  |  | 85 |  |  | — |
Total available-for-sale investments |  | $ | 3,187 |  |  | $ | 132 |  |  | $ | 5 |  |  | $ | 3,314 |  |  | $ | — |
(1) | Includes Ambac's holdings of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions.
(2) | At December 31, 2019, represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive income on securities that also had a credit impairment. These losses are included in gross unrealized losses at December 31, 2019.
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 June 30, 2020, by contractual maturity, were as follows:
|  | Amortized Cost |  | Estimated Fair Value
Due in one year or less |  | $ | 862 |  |  | $ | 863 |
Due after one year through five years |  | 912 |  |  | 923 |
Due after five years through ten years |  | 408 |  |  | 432 |
Due after ten years |  | 182 |  |  | 196 |
|  | 2,365 |  |  | 2,413 |
Residential mortgage-backed securities |  | 258 |  |  | 291 |
Collateralized debt obligations |  | 74 |  |  | 73 |
Other asset-backed securities |  | 275 |  |  | 288 |
Total |  | $ | 2,972 |  |  | $ | 3,065 |
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 June 30, 2020, did not have an allowance for credit losses under the new CECL standard and, at December 31, 2019, did not have other-than-temporary impairments recorded in earnings under prior GAAP. This information is aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at June 30, 2020 and December 31, 2019:
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
June 30, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 114 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 123 |  |  | $ | 3 |
Corporate obligations |  | 508 |  |  | 7 |  |  | — |  |  | — |  |  | 508 |  |  | 7 |
U.S. government obligations |  | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |
Residential mortgage-backed securities |  | 70 |  |  | 1 |  |  | — |  |  | — |  |  | 70 |  |  | 1 |
Collateralized debt obligations |  | 60 |  |  | 1 |  |  | 13 |  |  | — |  |  | 73 |  |  | 2 |
Other asset-backed securities |  | 87 |  |  | 6 |  |  | 3 |  |  | 1 |  |  | 90 |  |  | 7 |
|  | 846 |  |  | 18 |  |  | 25 |  |  | 2 |  |  | 870 |  |  | 20 |
Short-term |  | 75 |  |  | — |  |  | — |  |  | — |  |  | 75 |  |  | — |
Total securities |  | $ | 921 |  |  | $ | 18 |  |  | $ | 25 |  |  | $ | 2 |  |  | $ | 945 |  |  | $ | 20 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 13 |  |  | $ | — |  |  | $ | 10 |  |  | $ | — |  |  | $ | 23 |  |  | $ | — |
Corporate obligations |  | 63 |  |  | 2 |  |  | 5 |  |  | — |  |  | 68 |  |  | 2 |
Foreign obligations |  | 20 |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |
U.S. government obligations |  | 36 |  |  | 2 |  |  | 2 |  |  | — |  |  | 38 |  |  | 2 |
Residential mortgage-backed securities |  | 5 |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | — |
Commercial mortgage-backed securities |  | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |
Collateralized debt obligations |  | 53 |  |  | — |  |  | 63 |  |  | 1 |  |  | 116 |  |  | 1 |
Other asset-backed securities |  | 2 |  |  | — |  |  | 7 |  |  | — |  |  | 10 |  |  | — |
|  | 200 |  |  | 4 |  |  | 88 |  |  | 1 |  |  | 288 |  |  | 5 |
Short-term |  | 201 |  |  | — |  |  | — |  |  | — |  |  | 201 |  |  | — |
Total securities |  | $ | 401 |  |  | $ | 4 |  |  | $ | 88 |  |  | $ | 1 |  |  | $ | 489 |  |  | $ | 5 |
Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments | The following table details amounts included in net realized gains (losses) and impairments included in earnings for the affected periods:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Gross realized gains on securities |  | $ | 20 |  |  | $ | 10 |  |  | $ | 27 |  |  | $ | 34 |
Gross realized losses on securities |  | (11 | ) |  | — |  |  | (11 | ) |  | (4 | )
Net foreign exchange (losses) gains |  | 1 |  |  | 26 |  |  | 3 |  |  | 23 |
Credit impairments (1) |  | — |  |  | — |  |  | — |  |  | — |
Intent / requirement to sell impairments (2) |  | — |  |  | — |  |  | — |  |  | — |
Net realized gains (losses) |  | $ | 10 |  |  | $ | 36 |  |  | $ | 18 |  |  | $ | 53 |
(1) | Includes securities which management does not intend to sell and it is not more likely than not that the Company will be required to sell before recovery of the amortized cost basis.
(2) Includes securities which management either intends sell or it is more likely than not that the Company will be required to sell before recovery of the amortized cost basis.
Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income | The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities for which a portion of an other-than-temporary impairment was recognized in other comprehensive income under prior GAAP for the six months ended June 30, 2019:
Balance, beginning of period |  | $ | 12 |
Reductions for credit impairments previously recognized on: |  |
Securities that matured or were sold during the period |  | (1 | )
Balance, end of period |  | $ | 12 |
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, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at June 30, 2020 and December 31, 2019, respectively:
|  | Municipal Obligations |  | Corporate Obligations (2) |  | Mortgage and Asset- backed Securities |  | Total |  | Weighted Average Underlying Rating (1)
June 30, 2020: |  |  |  |  |  |  |  |  |  |
Ambac Assurance Corporation |  | $ | 294 |  |  | $ | 467 |  |  | $ | 458 |  |  | $ | 1,220 |  |  | CCC+
National Public Finance Guarantee Corporation |  | 8 |  |  | — |  |  | — |  |  | 8 |  |  | BBB-
Total |  | $ | 303 |  |  | $ | 467 |  |  | $ | 458 |  |  | $ | 1,228 |  |  | B-
December 31, 2019: |  |  |  |  |  |  |  |  |  |
Ambac Assurance Corporation |  | $ | 176 |  |  | $ | 535 |  |  | $ | 442 |  |  | $ | 1,153 |  |  | B-
National Public Finance Guarantee Corporation |  | 11 |  |  | — |  |  | — |  |  | 11 |  |  | BBB-
Total |  | $ | 187 |  |  | $ | 535 |  |  | $ | 442 |  |  | $ | 1,164 |  |  | B-
(1) | Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.
(2) Represents Ambac's holdings of secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions. These secured notes are insured by Ambac Assurance.
Equity Method Investments [Table Text Block] | Ambac has pre-funded capital contributions (included in Other Assets on the Consolidated Balance Sheet and in Purchase of Other Invested Assets in the Consolidated Statements of Cash Flows) of $75 and unfunded commitments of $49 to private credit and private equity funds at June 30, 2020.
|  | Fair Value |  |  |  |
Class of Funds |  | June 30, 2020 |  | December 31, 2019 |  | Redemption Frequency |  | Redemption Notice Period
Real estate properties (1) |  | $ | 15 |  |  | $ | 16 |  |  | quarterly |  | 10 business days
Hedge funds (2) |  | 100 |  |  | 65 |  |  | quarterly |  | 90 days
High yields and leveraged loans (3) (10) |  | 49 |  |  | 176 |  |  | daily |  | 0 - 30 days
Private credit (4) |  | 56 |  |  | 51 |  |  | quarterly |  | 180 days if permitted
Insurance-linked investments (5) |  | 3 |  |  | 3 |  |  | fully redeemed |  | none
Equity market investments (6) (10) |  | 40 |  |  | 55 |  |  | daily |  | 0 days
Investment grade floating rate income (7) |  | 66 |  |  | 66 |  |  | weekly |  | 0 days
Private equity (8) |  | 4 |  |  | — |  |  | quarterly |  | 90 days if permitted
Emerging markets debt (9) (10) |  | 17 |  |  | — |  |  | daily |  | 0 days
Total equity investments in pooled funds |  | $ | 350 |  |  | $ | 432 |  |  |  |  |
(1) | Investments consist of UK property to generate income and capital growth.
(2) | This class seeks to generate superior risk-adjusted returns through selective asset sourcing, active trading and hedging strategies within structured credit markets, including mortgage-backed securities, commercial real estate securities and loans, CLOs, REITs and asset backed securities.
(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 aims to obtain high long-term return primarily through credit and preferred equity investments with low liquidity and defined term.
(5) | This class seeks to generate returns from insurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments.
(6) | This class of funds aim to achieve long term growth through diversified exposure to global equity markets.
(7) | This class of funds includes investments in high quality floating rate debt securities including ABS and corporate floating rate notes as well as ultra-short term bonds and money market instruments.
(8) | This class seeks to generate long-term capital appreciation through investments in private equity, equity-related and other instruments.
(9) | This class seeks long-term income and growth through investments in the bonds of issuers in emerging markets.
(10) These categories include fair value amounts totaling $50 and $136 at June 30, 2020 and December 31, 2019, respectively, that are readily determinable and are priced through pricing vendors, including for High yield and leveraged loans products: $3 and $81; for Equity market investments: $30 and $55; and for Emerging markets debt $17 and $0
Summary of Net Investment Income | Net investment income (loss) was comprised of the following for the affected periods:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Fixed income securities |  | $ | 26 |  |  | $ | 74 |  |  | $ | 55 |  |  | $ | 118 |
Short-term investments |  | 1 |  |  | 5 |  |  | 4 |  |  | 10 |
Investment expense |  | (1 | ) |  | (1 | ) |  | (3 | ) |  | (3 | )
Securities available-for-sale and short-term |  | 26 |  |  | 78 |  |  | 57 |  |  | 125 |
Other investments |  | 27 |  |  | 8 |  |  | (25 | ) |  | 16 |
Total net investment income (loss) |  | $ | 52 |  |  | $ | 86 |  |  | $ | 31 |  |  | $ | 141 |
Net investment income (loss) from Other investments primarily represents changes in fair value on securities classified as trading or accounted for under the fair value option, income from investment limited partnerships accounted for under the equity method and the above noted equity interest in an unconsolidated trust accounted for under the equity method. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Net gains (losses) recognized during the period on trading securities |  | $ | 17 |  |  | $ | 7 |  |  | $ | (16 | ) |  | $ | 14 |
Less: net gains (losses) recognized during the reporting period on trading securities sold during the period |  | 5 |  |  | 3 |  |  | (19 | ) |  | 4 |
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date |  | $ | 12 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 10 |

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