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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The following tables summarize the location and gross fair values of individual derivative instruments and the impact of legal rights of offset as reported in the Consolidated Balance Sheets, as of December 31, 2023 and 2022.
| December 31, 2023: |  | December 31, 2022:
| Gross Amounts of Recognized Assets / Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet |  | Gross Amount of Collateral Received / Pledged not Offset in the Consolidated Balance Sheet |  | Net Amount |  | Gross Amounts of Recognized Assets / Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheet |  | Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet |  | Gross Amount of Collateral Received / Pledged not Offset in the Consolidated Balance Sheet |  | Net Amount
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 25 |  |  | $ | — |  |  | $ | 25 |  |  | $ | — |  |  | $ | 25 |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |
Warrants | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total non-VIE derivative assets | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | 28 |  |  | $ | — |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 35 |  |  | $ | — |  |  | $ | 35 |  |  | $ | 35 |  |  | $ | — |  |  | $ | 38 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 38 |  |  | $ | — |
Total non-VIE derivative liabilities | $ | 35 |  |  | $ | — |  |  | $ | 35 |  |  | $ | 35 |  |  | $ | — |  |  | $ | 38 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 38 |  |  | $ | — |
Variable interest entities assets: Derivative and other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 190 |  |  | $ | — |  |  | $ | 190 |  |  | $ | 190 |  |  | $ | — |  |  | $ | 190 |  |  | $ | — |  |  | $ | 190 |  |  | $ | — |  |  | $ | 190 |
Currency swaps | 36 |  |  | — |  |  | 36 |  |  | 36 |  |  | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | 49 |
Total VIE derivative assets | $ | 226 |  |  | $ | — |  |  | $ | 226 |  |  | $ | 226 |  |  | $ | — |  |  | $ | 239 |  |  | $ | — |  |  | $ | 239 |  |  | $ | — |  |  | $ | 239 |
Variable interest entities liabilities: Derivative liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 1,197 |  |  | $ | — |  |  | $ | 1,197 |  |  | $ | — |  |  | $ | 1,197 |  |  | $ | 1,048 |  |  | $ | — |  |  | $ | 1,048 |  |  | $ | — |  |  | $ | 1,048 |
Total VIE derivative liabilities | $ | 1,197 |  |  | $ | — |  |  | $ | 1,197 |  |  | $ | — |  |  | $ | 1,197 |  |  | $ | 1,048 |  |  | $ | — |  |  | $ | 1,048 |  |  | $ | — |  |  | $ | 1,048 |
Summary of Location and Amount of Gains and Losses of Derivative Contracts | The following tables summarize the location and amount of gains and losses of derivative contracts in the Consolidated Statements of Total Comprehensive Income (Loss) for the years ended December 31, 2023, 2022 and 2021:
| Location of Gain (Loss) Recognized in Consolidated Statements of Total Comprehensive Income (Loss) |  | Amount of Gain (Loss) Recognized in Consolidated Statement of Total Comprehensive Income (Loss) – Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Non-VIE derivatives: |  |  |  |  |  |  |
Interest rate swaps | Net gains (losses) on derivative contracts |  | (1) |  |  | 65 |  |  | 13 |
Warrants | Net gains (losses) on derivative contracts |  | — |  |  | 1 |  |  | — |
Futures contracts | Net gains (losses) on derivative contracts |  | — |  |  | 62 |  |  | 9 |
Total Non-VIE derivatives |  |  |  |  | (1) |  |  | 129 |  |  | 22 |
Variable Interest Entities: |  |  |  |  |  |  |  |  |
Currency swaps | Income (loss) on variable interest entities |  | (1) |  |  | 24 |  |  | 2 |
Interest rate swaps | Income (loss) on variable interest entities |  | (62) |  |  | 541 |  |  | (152) |
Total Variable Interest Entities |  |  |  |  | (63) |  |  | 565 |  |  | (150) |
Total derivative contracts |  |  |  |  | $ | (64) |  |  | $ | 694 |  |  | $ | (128) |
Summary of Notional Amounts of AFS's Trading Derivative Products | As of December 31, 2023 and 2022, the notional amounts of AFS's derivatives are as follows:
| Notional - December 31,
Type of Derivative | 2023 |  | 2022
Interest rate swaps—pay-fixed/receive-variable | $ | 141 |  |  | $ | 989 |
Interest rate swaps—receive-fixed/pay-variable | 167 |  |  | 337 |
Warrants: At December 31, 2023 and 2022, Ambac holds warrants to purchase preferred stock of a development stage company.
Variable Interest Entity [Member] |
Summary of Notional Amounts of AFS's Trading Derivative Products | The notional for VIE derivatives outstanding as of December 31, 2023 and 2022, were as follows:
| Notional - December 31,
Type of VIE Derivative | 2023 |  | 2022
Interest rate swaps—receive-fixed/pay-variable | $ | 1,662 |  |  | $ | 1,573 |
Interest rate swaps—pay-fixed/receive-variable | 864 |  |  | 887 |
Currency swaps | 149 |  |  | 176 |

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