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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2020
Variable Interest Entity Not Primary Beneficiary Table [Line Items] |
Schedule of Variable Interest Entities Assets and Liabilities [Table Text Block] | The following schedule details the components of Income (loss) on variable interest entities for the affected periods:
Year ended December 31, |  | 2020 |  | 2019 |  | 2018
Net change in fair value of VIE assets and liabilities reported under the fair value option |  | $ | (1) |  |  | $ | 13 |  |  | $ | 3 |
Less: Credit risk changes of fair value option long-term debt reported through other comprehensive income (loss) |  | (1) |  |  | — |  |  | (1) |
Net change in fair value of VIE assets and liabilities reported in earnings |  | (3) |  |  | 14 |  |  | 2 |
Investment income on available-for-sale securities |  | 7 |  |  | 10 |  |  | — |
Net realized investment gains (losses) on available-for-sale securities |  | 8 |  |  | 13 |  |  | — |
Interest expense on long-term debt carried at par less unamortized cost |  | (6) |  |  | (11) |  |  | — |
Other expenses |  | — |  |  | (1) |  |  | — |
Gain (loss) from consolidating FG VIEs |  | — |  |  | 15 |  |  | — |
Gain (loss) from de-consolidating FG VIEs |  | — |  |  | (2) |  |  | 2 |
Income (loss) on variable interest entities |  | $ | 5 |  |  | $ | 38 |  |  | $ | 3 |
Variable Interest Entity Not Primary Beneficiary Table [Table Text Block] | The following table displays the carrying amount of the assets, liabilities and maximum exposure to loss of Ambac’s variable interests in non-consolidated VIEs resulting from financial guarantee and derivative contracts by major underlying asset classes, as of December 31, 2020 and 2019:
| Carrying Value of Assets and Liabilities
| Maximum Exposure To Loss (1) |  | Insurance Assets (2) |  | Insurance Liabilities (3) |  | Net Derivative Assets (Liabilities) (4)
December 31, 2020: |  |  |  |  |  |  |
Global structured finance: |  |  |  |  |  |  |
Mortgage-backed—residential | $ | 4,308 |  |  | $ | 2,024 |  |  | $ | 580 |  |  | $ | — |
Other consumer asset-backed | 1,050 |  |  | 24 |  |  | 239 |  |  | — |
Other commercial asset-backed | 24 |  |  | 3 |  |  | 1 |  |  | — |
Other | 970 |  |  | — |  |  | 13 |  |  | 8 |
Total global structured finance | 6,352 |  |  | 2,051 |  |  | 834 |  |  | 8 |
Global public finance | 21,646 |  |  | 263 |  |  | 287 |  |  | — |
Total | $ | 27,998 |  |  | $ | 2,314 |  |  | $ | 1,122 |  |  | $ | 8 |
December 31, 2019: |  |  |  |  |  |  |
Global structured finance: |  |  |  |  |  |  |
Mortgage-backed—residential | $ | 5,373 |  |  | $ | 1,913 |  |  | $ | 523 |  |  | $ | — |
Other consumer asset-backed | 1,373 |  |  | 31 |  |  | 216 |  |  | — |
Other commercial asset-backed | 314 |  |  | 9 |  |  | 6 |  |  | — |
Other | 1,107 |  |  | 7 |  |  | 18 |  |  | 8 |
Total global structured finance | 8,165 |  |  | 1,961 |  |  | 762 |  |  | 8 |
Global public finance | 23,341 |  |  | 287 |  |  | 321 |  |  | — |
Total | $ | 31,506 |  |  | $ | 2,247 |  |  | $ | 1,083 |  |  | $ | 7 |
(1)Maximum exposure to loss represents the maximum future payments of principal and interest on insured obligations and derivative contracts. Ambac’s maximum exposure to loss does not include the benefit of any financial instruments (such as reinsurance or hedge contracts) that Ambac may utilize to mitigate the risks associated with these variable interests. (2)Insurance assets represent the amount included in “Premium receivables” and “Subrogation recoverable” for financial guarantee insurance contracts on Ambac’s Consolidated Balance Sheets. (3)Insurance liabilities represent the amount included in “Loss and loss expense reserves” and “Unearned premiums” for financial guarantee insurance contracts on Ambac’s Consolidated Balance Sheets. (4)Net derivative assets (liabilities) represent the fair value recognized on credit derivative contracts and interest rate swaps on Ambac’s Consolidated Balance Sheets.

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- Definition Schedule of Variable Interest Entities Assets and Liabilities [Table Text Block] + References No definition available. + Details
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- Definition [Line Items] for Variable Interest Entity Not Primary Beneficiary Table [Table] + References No definition available. + Details
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