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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Common stock, shares issued | 46,658,990 | 46,477,068 |  |
Treasury stock, shares | 1,685,233 | 172,929 |  |
Common Stock, Shares, Outstanding | 44,973,757 |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | $ 1,966 |  |  |
Short-term investments, at cost (approximates fair value) | 2,041 |  |  |
Other Investments | 568 | $ 690 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investments, Total | 2,593 | 2,955 |  |
Other assets | 84 | 68 |  |
Total assets | 7,973 | 12,303 |  |
Liabilities: |  |  |  |
Total liabilities | 6,647 | 11,187 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 274 | 257 |  |
Accumulated other comprehensive income (loss) | (253) | 58 | $ 79 |
Retained earnings | 1,245 | 726 |  |
Common stock held in treasury at cost | (15) | (3) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,252 | 1,038 |  |
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 7,973 | 12,303 |  |
Short-term investments, amortized cost | 507 | 415 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Short-term investments, at cost (approximates fair value) | 13 | 130 |  |
Other Investments | 16 | 11 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 3 |  |
Investments, Total | 203 | 254 |  |
Cash | 3 | 1 |  |
Investment in subsidiaries | 1,029 | 769 |  |
Investment income due and accrued | 1 | 1 |  |
Other assets | 19 | 17 |  |
Total assets | 1,255 | 1,041 |  |
Taxes Payable, Current | 1 | 1 |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 3 | 2 |  |
Total liabilities | 3 | 3 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 274 | 257 |  |
Accumulated other comprehensive income (loss) | (253) | 58 |  |
Retained earnings | 1,245 | 726 |  |
Common stock held in treasury at cost | (15) | (3) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,252 | 1,038 | $ 1,080 | $ 1,477
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 1,255 | 1,041 |  |
Short-term investments, amortized cost | 175 | 124 |  |
Short-term Investments [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 507 | 414 |  |
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) | 175 | 124 |  |
Fixed Income Securities [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 1,395 | 1,730 |  |
Short-term investments, at cost (approximates fair value) | 1,469 | 1,605 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investment income due and accrued | 10 | 10 |  |
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | $ 12 | $ 119 |  |

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