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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Millions | Mar. 31, 2020 USD ($) Entity | Dec. 31, 2019 USD ($) Entity | Mar. 31, 2019 USD ($)
--- | --- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost | $ 3,038 | $ 3,187 |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 3,037 |  |
Restricted Cash | 31 | 55 | $ 0
Derivative assets | 88 | 75 |
Other assets | 144 | 95 |
Total assets | 12,777 | 13,320 |
Interest Payable | 457 | 441 |
Long-term debt | 2,760 | 2,822 |
Derivative Liability | 137 | 90 |
Other Liabilities | 131 | 93 |
Liabilities | 11,716 | 11,783 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 81 | 132 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,928 | 3,121 |
Restricted Cash | 2 | 2 | $ 3
Financing Receivable, after Allowance for Credit Loss | 2,932 | 3,108 |
Derivative assets | 62 | 52 |
Other assets | 1 | 3 |
Total assets | 5,925 | 6,286 |
Interest Payable | 0 | 1 |
Long-term debt | 4,092 | 4,351 |
Long-term Debt, at par less amortized discount | 171 | 203 |
Long-term debt | 4,263 | 4,554 |
Derivative Liability | 1,610 | 1,657 |
Liabilities | 5,873 | 6,212 |
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957 |
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 116 | 139 |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 25 |
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 2,932 | 3,108 |
Derivative assets | 62 | 52 |
Other assets | 0 | 1 |
Total assets | 5,801 | 6,119 |
Interest Payable | 0 | 1 |
Long-term debt | 4,092 | 4,351 |
Long-term Debt, at par less amortized discount | 0 | 0 |
Long-term debt | 4,092 | 4,351 |
Derivative Liability | 1,610 | 1,657 |
Liabilities | 5,702 | 6,009 |
Ambac UK [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 2,806 | 2,957 |
Ambac UK [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0 |
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 122 | 164 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 0 | 0 |
Derivative assets | 0 | 0 |
Other assets | 1 | 2 |
Total assets | 124 | 167 |
Interest Payable | 0 | 0 |
Long-term debt | 0 | 0 |
Long-term Debt, at par less amortized discount | 171 | 203 |
Long-term debt | 171 | 203 |
Derivative Liability | 0 | 0 |
Liabilities | 171 | 203 |
Ambac Assurance [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | 0 | 0 |
Ambac Assurance [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,367 and $2,450) | $ 122 | $ 164 |
Consolidated Entities [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 7 | 7 |
Consolidated Entities [Member] | Ambac UK [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 6 | 6 |
Consolidated Entities [Member] | Ambac Assurance [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 1 | 1 |

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