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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 01, 2013
--- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Common stock, shares issued | 45,571,743 | 45,365,170 |  |  |
Treasury stock, shares | 16,343 | 28,892 |  |  |
Common Stock, Shares, Outstanding | 45,555,400 | 45,336,278 |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | $ 3,314 |  |  |  |
Junior surplus note of Ambac Assurance Segregated Account |  |  |  |  | $ 350
Short-term investments, at cost (approximates fair value) | 3,187 | $ 3,451 |  |  |
Other Investments | 478 | 391 |  |  |
Total investments | 3,792 | 3,937 |  |  |
Other assets | 95 | 138 |  |  |
Total assets | 13,320 | 14,589 |  |  |
Tolling Payment Payable to AFG | 28 | 44 |  |  |
Liabilities: |  |  |  |  |
Total liabilities | 11,783 | 12,956 |  |  |
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  |
Common stock | 0 | 0 |  |  |
Additional paid-in capital | 232 | 219 |  |  |
Accumulated other comprehensive income (loss) | 42 | (49) | $ (52) |  |
Retained earnings | 1,203 | 1,421 |  |  |
Common stock held in treasury at cost | 0 | 0 |  |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,477 | 1,592 |  |  |
Total liabilities and stockholders’ equity | 13,320 | 14,589 |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Short-term investments, at cost (approximates fair value) | 71 | 151 |  |  |
Other Investments | 46 | 40 |  |  |
Total investments | 434 | 381 |  |  |
Cash | 9 | 15 |  |  |
Investment in subsidiaries | 993 | 1,148 |  |  |
Investment income due and accrued | 1 | 1 |  |  |
Current taxes receivable | 30 | 44 |  |  |
Other assets | 11 | 3 |  |  |
Total assets | 1,478 | 1,593 |  |  |
Liabilities: |  |  |  |  |
Accounts payable and other liabilities | 2 | 1 |  |  |
Total liabilities | 2 | 1 |  |  |
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  |
Common stock | 0 | 0 |  |  |
Additional paid-in capital | 232 | 219 |  |  |
Accumulated other comprehensive income (loss) | 42 | (49) |  |  |
Retained earnings | 1,203 | 1,421 |  |  |
Common stock held in treasury at cost | 0 | 0 |  |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,477 | 1,592 | $ 1,381 | $ 1,714 |
Total liabilities and stockholders’ equity | 1,478 | 1,593 |  |  |
Short-term Investments [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | 653 | 430 |  |  |
Short-term investments, at cost (approximates fair value) | 653 | 430 |  |  |
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Short-term investments, at cost (approximates fair value) | 318 | 193 |  |  |
Fixed Income Securities [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | 2,577 | 3,116 |  |  |
Short-term investments, at cost (approximates fair value) | 2,450 | 3,021 |  |  |
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | $ 70 | $ 148 |  |  |

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