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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Common stock, shares issued | 45,865,081 | 45,571,743
Treasury stock, shares | 55,942 | 16,343
Common Stock, Shares, Outstanding | 45,809,139 |
Assets: |  |
Debt Securities, Available-for-sale | $ 2,949 | $ 3,314
Short-term investments, at cost (approximates fair value) | 2,807 | 3,187
Other Investments | 595 | 478
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investments, Total | 3,544 | 3,792
Other assets | 114 | 95
Total assets | 13,220 | 13,320
Taxes Payable, Current | 6 | 0
Tolling Payment Payable to AFG |  | 28
Liabilities: |  |
Total liabilities | 12,074 | 11,783
Stockholders' equity (deficit): |  |
Preferred Stock, Value, Issued | 0 | 0
Common stock | 0 | 0
Additional paid-in capital | 242 | 232
Accumulated other comprehensive income (loss) | 79 | 42
Retained earnings | 759 | 1,203
Common stock held in treasury at cost | (1) | 0
Total Ambac Financial Group, Inc. stockholders’ equity | 1,080 | 1,477
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 13,220 | 13,320
Ambac Financial Group, Inc Parent Company Only [Member] |  |
Assets: |  |
Short-term investments, at cost (approximates fair value) | 76 | 71
Other Investments | 54 | 46
Debt Securities, Available-for-sale, Allowance for Credit Loss | 2 |
Investments, Total | 349 | 434
Cash | 7 | 9
Investment in subsidiaries | 714 | 993
Current taxes receivable | 0 | 30
Other assets | 13 | 12
Total assets | 1,082 | 1,478
Taxes Payable, Current | 0 | 0
Liabilities: |  |
Accounts payable and other liabilities | 2 | 2
Total liabilities | 3 | 2
Stockholders' equity (deficit): |  |
Preferred Stock, Value, Issued | 0 | 0
Common stock | 0 | 0
Additional paid-in capital | 242 | 232
Accumulated other comprehensive income (loss) | 79 | 42
Retained earnings | 759 | 1,203
Common stock held in treasury at cost | (1) | 0
Total Ambac Financial Group, Inc. stockholders’ equity | 1,080 | 1,477
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 1,082 | 1,478
Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 492 |
Short-term investments, at cost (approximates fair value) | 492 | 653
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |
Assets: |  |
Short-term investments, at cost (approximates fair value) | 229 | 318
Fixed Income Securities [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | 2,317 | 2,577
Short-term investments, at cost (approximates fair value) | 2,175 | 2,450
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Investment income due and accrued | 10 |
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale | $ 66 | 70
Fixed Income Securities [Member] | Short-term Investments [Member] |  |
Assets: |  |
Debt Securities, Available-for-sale |  | 653
Short-term investments, at cost (approximates fair value) |  | $ 653

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