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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Millions | Jun. 30, 2020 USD ($) Entity | Dec. 31, 2019 USD ($) Entity | Jun. 30, 2019 USD ($)
--- | --- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost | $ 2,972 | $ 3,187 |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 3,065 |  |
Restricted Cash | 15 | 55 | $ 0
Derivative assets | 97 | 75 |
Other assets | 145 | 95 |
Total assets | 12,761 | 13,320 |
Interest Payable | 474 | 441 |
Long-term debt | 2,749 | 2,822 |
Derivative Liability | 134 | 90 |
Other Liabilities | 83 | 93 |
Liabilities | 11,632 | 11,783 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 113 | 132 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 3,041 | 3,121 |
Restricted Cash | 2 | 2 | $ 29
Financing Receivable, after Allowance for Credit Loss | 2,787 | 3,108 |
Derivative assets | 61 | 52 |
Other assets | 2 | 3 |
Total assets | 5,893 | 6,286 |
Interest Payable | 0 | 1 |
Long-term debt | 3,953 | 4,351 |
Long-term Debt, at par less amortized discount | 173 | 203 |
Long-term debt | 4,125 | 4,554 |
Derivative Liability | 1,709 | 1,657 |
Liabilities | 5,835 | 6,212 |
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 2,907 | 2,957 |
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 116 | 139 |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 134 | 164 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 18 | 25 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 2,907 | 2,957 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 2,787 | 3,108 |
Derivative assets | 61 | 52 |
Other assets | 0 | 1 |
Total assets | 5,756 | 6,119 |
Interest Payable | 0 | 1 |
Long-term debt | 3,953 | 4,351 |
Long-term Debt, at par less amortized discount | 0 | 0 |
Long-term debt | 3,953 | 4,351 |
Derivative Liability | 1,709 | 1,657 |
Liabilities | 5,662 | 6,009 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 2,907 | 2,957 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Municipal Bonds [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 134 | 164 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 0 | 0 |
Derivative assets | 0 | 0 |
Other assets | 2 | 2 |
Total assets | 138 | 167 |
Interest Payable | 0 | 0 |
Long-term debt | 0 | 0 |
Long-term Debt, at par less amortized discount | 173 | 203 |
Long-term debt | 173 | 203 |
Derivative Liability | 0 | 0 |
Liabilities | 173 | 203 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Municipal Bonds [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450) | $ 134 | $ 164 |
Consolidated Entities [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 6 | 7 |
Consolidated Entities [Member] | Ambac UK [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 5 | 6 |
Consolidated Entities [Member] | Ambac Assurance [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 1 | 1 |

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