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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Common stock, shares issued | 46,659,144 | 46,658,990 |  |
Treasury Stock, Common, Shares | 1,463,774 | 1,685,233 |  |
Common Stock, Shares, Outstanding | 45,195,370 |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | $ 1,710 | $ 1,395 |  |
Short-term investments, at cost (approximates fair value) | 2,197 | 2,041 |  |
Other Investments | 475 | 568 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 3 | 0 |  |
Investments, Total | 2,664 | 2,593 |  |
Investment income due and accrued | 14 | 10 |  |
Other assets | 129 | 112 |  |
Assets | 8,428 | 7,973 | $ 12,303 |
Liabilities: |  |  |  |
Liabilities | 6,997 | 6,647 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 292 | 274 |  |
Accumulated other comprehensive income (loss) | (160) | (253) | 58 |
Retained earnings | 1,246 | 1,245 |  |
Common stock held in treasury at cost | (17) | (15) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,362 | 1,252 |  |
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 8,428 | 7,973 |  |
Short-term investments, amortized cost | 426 | 507 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 14 | 12 |  |
Short-term investments, at cost (approximates fair value) | 14 | 13 |  |
Other Investments | 18 | 16 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investments, Total | 188 | 203 |  |
Cash | 0 | 3 |  |
Investment in subsidiaries | 1,150 | 1,029 |  |
Investment income due and accrued | 1 | 1 |  |
Other assets | 24 | 19 |  |
Assets | 1,365 | 1,255 |  |
Taxes Payable, Current | 0 | 1 |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 3 | 3 |  |
Liabilities | 4 | 3 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 292 | 274 |  |
Accumulated other comprehensive income (loss) | (160) | (253) |  |
Retained earnings | 1,246 | 1,245 |  |
Common stock held in treasury at cost | (17) | (15) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,362 | 1,252 | $ 1,038 | $ 1,080
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 1,365 | 1,255 |  |
Short-term investments, amortized cost | 156 | 175 |  |
Short-term Investments [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 426 | 507 |  |
Short-term investments, at cost (approximates fair value) | 426 | 507 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Short-term investments, at cost (approximates fair value) | $ 156 | $ 175 |  |

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