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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | $ 1,710 | $ 1,395 |  |
Other Investments | 475 | 568 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 274 | 61 | $ 23 | $ 35
Derivative assets | 26 | 28 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | $ 35 | $ 38 |  |
Estimated Future Premium Payments Weighted Average Discounted Rate | 3.20% | 3.00% |  |
Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | $ 25 | $ 27 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 35 | 38 |  |
Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,167 | 1,967 |  |
Loans, at fair value | 1,663 | 1,829 |  |
Derivative assets | 226 | 239 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 1,197 | 1,048 |  |
Long-term Debt | $ 2,710 | $ 2,788 |  |
Estimated Future Premium Payments Weighted Average Discounted Rate | 6.30% | 6.80% |  |
Variable Interest Entity [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | $ 190 | $ 190 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 1,197 | 1,048 |  |
Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 426 | 507 |  |
Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 303 | 224 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 139 | 137 |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 250 | 238 |  |
US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 82 | 65 |  |
Debt Security, Government, Non-US [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 100 | 76 |  |
Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 745 | 598 |  |
Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,072 | 1,828 |  |
Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 72 | 43 |  |
Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 95 | 96 |  |
Debt Securities, Trading | 0 | 43 |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 19 | 0 |  |
Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 1 | 1 |  |
Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 77 | 61 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 28 | 44 |  |
Loans | 2 | 10 |  |
Total financial assets | 7,022 | 6,726 |  |
Financial liabilities: |  |  |  |
Liabilities for net financial guarantees written | 292 | 159 |  |
Long-term Debt | 983 | 1,065 |  |
Total financial liabilities | 5,474 | 5,418 |  |
Carrying Amount [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Restricted cash | 246 | 17 |  |
Loans, at fair value | 1,663 | 1,829 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 2,967 | 3,107 |  |
Carrying Amount [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 475 | 568 |  |
Carrying Amount [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 426 | 507 |  |
Carrying Amount [Member] | Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,072 | 1,828 |  |
Carrying Amount [Member] | Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 95 | 96 |  |
Debt Securities, Trading | 0 | 43 |  |
Carrying Amount [Member] | Interest Rate Swap [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 35 | 38 |  |
Carrying Amount [Member] | Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 190 |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 1,197 | 1,048 |  |
Carrying Amount [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 36 | 49 |  |
Carrying Amount [Member] | Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 1 | 1 |  |
Total Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 28 | 44 |  |
Other Assets [Member] | Carrying Amount [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 25 | 27 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 386 | 494 |  |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 27 | 43 |  |
Total financial assets | 979 | 833 |  |
Financial liabilities: |  |  |  |
Liabilities for net financial guarantees written | 0 | 0 |  |
Long-term Debt | 0 | 0 |  |
Total financial liabilities | 0 | 0 |  |
Level 1 [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Restricted cash | 246 | 17 |  |
Loans | 0 | 0 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 0 | 0 |  |
Level 1 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 77 | 61 |  |
Level 1 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 421 | 506 |  |
Level 1 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Level 1 [Member] | Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Debt Securities, Trading | 0 | 0 |  |
Level 1 [Member] | Interest Rate Swap [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Level 1 [Member] | Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 190 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Level 1 [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 0 |  |
Level 1 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 2 | 1 |  |
Total financial assets | 1,795 | 1,615 |  |
Financial liabilities: |  |  |  |
Liabilities for net financial guarantees written | 0 | 0 |  |
Long-term Debt | 679 | 864 |  |
Total financial liabilities | 4,671 | 4,942 |  |
Level 2 [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Restricted cash |  | 0 |  |
Loans | 0 | 0 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 2,760 | 2,992 |  |
Level 2 [Member] | Variable Interest Entity [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets |  | 190 |  |
Level 2 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 0 |  |
Level 2 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 5 | 1 |  |
Level 2 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Level 2 [Member] | Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 95 | 96 |  |
Debt Securities, Trading | 0 | 43 |  |
Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 35 | 38 |  |
Level 2 [Member] | Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 190 | 0 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 1,197 | 1,048 |  |
Level 2 [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 36 | 49 |  |
Level 2 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 0 | 0 |  |
Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 1 |  |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Total financial assets | 3,850 | 3,772 |  |
Financial liabilities: |  |  |  |
Liabilities for net financial guarantees written | 788 | 476 |  |
Long-term Debt | 18 | 14 |  |
Total financial liabilities | 1,026 | 644 |  |
Level 3 [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Restricted cash | 0 | 0 |  |
Loans | 1,663 | 1,829 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 220 | 154 |  |
Level 3 [Member] | Variable Interest Entity [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 0 |  |
Level 3 [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 0 | 0 |  |
Level 3 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 0 | 0 |  |
Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,072 | 1,828 |  |
Level 3 [Member] | Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Debt Securities, Trading | 0 | 0 |  |
Level 3 [Member] | Interest Rate Swap [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Level 3 [Member] | Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 0 | 0 |  |
Level 3 [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 0 | 0 |  |
Level 3 [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 2 | 10 |  |
Level 3 [Member] | Warrant [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 1 | 1 |  |
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 25 | 26 |  |
Municipal Bonds [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 99 | 102 |  |
Corporate Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 745 | 598 |  |
Debt Security, Government, Non-US [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 100 | 76 |  |
US Government Debt Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 82 | 65 |  |
Residential Mortgage-Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 250 | 238 |  |
Collateralized Debt Obligations [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 139 | 137 |  |
Asset-backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 303 | 224 |  |
Commercial Mortgage Backed Securities [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 19 | 15 |  |
Fair Value, Recurring [Member] |  |  |  |
Financial assets: |  |  |  |
Total financial assets | 7,010 | 6,715 |  |
Financial liabilities: |  |  |  |
Liabilities for net financial guarantees written | 788 | 476 |  |
Long-term Debt | 697 | 878 |  |
Total financial liabilities | 5,697 | 5,586 |  |
Fair Value, Recurring [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Restricted cash | 246 | 17 |  |
Loans | 1,663 | 1,829 |  |
Financial liabilities: |  |  |  |
Long-term Debt | 2,980 | 3,145 |  |
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Other Investments | 463 | 556 |  |
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Short term investments | 426 | 507 |  |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 303 | 224 |  |
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 139 | 137 |  |
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 250 | 238 |  |
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 82 | 65 |  |
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 100 | 76 |  |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 745 | 598 |  |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 2,072 | 1,828 |  |
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 99 | 102 |  |
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 95 | 96 |  |
Debt Securities, Trading | 0 | 43 |  |
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |  |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 35 | 38 |  |
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 190 | 190 |  |
Financial liabilities: |  |  |  |
Derivative liabilities | 1,197 | 1,048 |  |
Fair Value, Recurring [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 36 | 49 |  |
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |  |  |
Financial assets: |  |  |  |
Loans | 2 | 10 |  |
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 19 |  |  |
Fair Value, Recurring [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Financial assets: |  |  |  |
Derivative assets | 25 | 27 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 82 | 65 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 100 | 76 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 235 | 157 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 139 | 137 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 250 | 238 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 726 | 585 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 99 | 102 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 19 | 15 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 68 | 67 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Debt Security, Government, Non-US [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 19 | 12 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Collateral Pledged [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 27 | 64 |  |
Collateral Pledged [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 27 | 64 |  |
Collateral Pledged [Member] | Short-term Investments [Member] | Carrying Amount [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 27 | 64 |  |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 27 | 64 |  |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 27 | 64 |  |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  |
Collateral Pledged [Member] | Fair Value, Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] |  |  |  |
Financial assets: |  |  |  |
Debt Securities, Available-for-sale | $ 0 | $ 0 |  |

X
- Definition Weighted average discounted rate of estimated future premium payments to be paid by the VIEs. + References No definition available. + Details
Name: | ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate
Namespace Prefix: | ambc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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