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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Common stock, shares issued | 46,477,068 | 45,865,081 |  |
Treasury stock, shares | 172,929 | 55,942 |  |
Common Stock, Shares, Outstanding | 46,304,139 |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | $ 2,265 |  |  |
Short-term investments, at cost (approximates fair value) | 2,140 |  |  |
Other Investments | 690 | $ 595 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investments, Total | 2,955 | 3,544 |  |
Other assets | 68 | 68 |  |
Total assets | 12,303 | 13,220 |  |
Liabilities: |  |  |  |
Total liabilities | 11,187 | 12,074 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 257 | 242 |  |
Accumulated other comprehensive income | 58 | 79 | $ 42 |
Retained earnings | 726 | 759 |  |
Common stock held in treasury at cost | (3) | (1) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,038 | 1,080 |  |
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 12,303 | 13,220 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Short-term investments, at cost (approximates fair value) | 130 | 76 |  |
Other Investments | 11 | 54 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 3 | 2 |  |
Investments, Total | 254 | 349 |  |
Cash | 1 | 7 |  |
Investment in subsidiaries | 769 | 714 |  |
Investment income due and accrued | 1 | 0 |  |
Other assets | 17 | 13 |  |
Total assets | 1,041 | 1,082 |  |
Taxes Payable, Current | 1 | 0 |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 2 | 2 |  |
Total liabilities | 3 | 3 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 0 | 0 |  |
Additional paid-in capital | 257 | 242 |  |
Accumulated other comprehensive income | 58 | 79 |  |
Retained earnings | 726 | 759 |  |
Common stock held in treasury at cost | (3) | (1) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,038 | 1,080 | $ 1,477 | $ 1,592
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 1,041 | 1,082 |  |
Short-term Investments [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 414 | 492 |  |
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) | 124 | 229 |  |
Fixed Income Securities [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 1,730 | 2,317 |  |
Short-term investments, at cost (approximates fair value) | 1,605 | 2,175 |  |
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 | $ 119 | $ 66 |  |

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