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Long-Term Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Debt Instrument [Line Items] |
Schedule of Maturities of Long-term Debt [Table Text Block] | Aggregated annual maturities of non-VIE long-term debt obligations (based on scheduled maturity dates as further discussed below) are as follows:
2024 |  | $ | 519 |  | (1)
2025 |  | — |  |
2026 |  | — |  |
2027 |  | — |  |
2028 |  | — |  |
Thereafter |  | 41 |  |
Total |  | $ | 560 |  |
Schedule of Long-term Debt Instruments | Long-term debt outstanding, excluding VIE long-term debt, was as follows:
December 31, |  |  |  | 2023 |  | 2022
|  |  |  | Par Value |  | Unamortized Discount |  | Carrying Value |  | Par Value |  | Unamortized Discount |  | Carrying Value
Ambac Assurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.1% Surplus Notes |  |  |  | $ | 519 |  |  | $ | (28) |  |  | $ | 491 |  |  | $ | 519 |  |  | $ | (42) |  |  | $ | 477 |
Tier 2 Notes |  |  |  | — |  |  | — |  |  | — |  |  | 146 |  |  | — |  |  | 146 |
Ambac UK Debt |  |  |  | 41 |  |  | (24) |  |  | 17 |  |  | 41 |  |  | (25) |  |  | 16 |
Long-term debt |  |  |  | $ | 560 |  |  | $ | (52) |  |  | $ | 508 |  |  | $ | 706 |  |  | $ | (67) |  |  | $ | 639 |

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