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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Millions | Sep. 30, 2020 USD ($) Entity | Dec. 31, 2019 USD ($) Entity | Sep. 30, 2019 USD ($)
--- | --- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost | $ 2,914 |  |
Fixed income securities, at fair value | 3,048 |  |
Restricted Cash | 10 | $ 55 | $ 13
Derivative assets | 95 | 75 |
Other assets | 60 | 95 |
Total assets | 12,812 | 13,320 |
Interest Payable | 499 | 441 |
Long-term debt | 2,737 | 2,822 |
Derivative Liability | 126 | 90 |
Other Liabilities | 91 | 93 |
Liabilities | 11,718 | 11,783 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 141 | 132 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value | 3,160 | 3,121 |
Restricted Cash | 2 | 2 | $ 3
Financing Receivable, after Allowance for Credit Loss | 2,783 | 3,108 |
Derivative assets | 53 | 52 |
Other assets | 1 | 3 |
Total assets | 5,998 | 6,286 |
Interest Payable | 0 | 1 |
Long-term debt | 4,002 | 4,351 |
Long-term Debt, at par less amortized discount | 167 | 203 |
Long-term debt | 4,169 | 4,554 |
Derivative Liability | 1,771 | 1,657 |
Liabilities | 5,940 | 6,212 |
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value | 3,029 | 2,957 |
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 112 | 139 |
Fixed income securities, at fair value | 131 | 164 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 19 | 25 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] |  |  |
Fixed income securities, at fair value | 3,029 | 2,957 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 2,783 | 3,108 |
Derivative assets | 53 | 52 |
Other assets | 0 | 1 |
Total assets | 5,865 | 6,119 |
Interest Payable | 0 | 1 |
Long-term debt | 4,002 | 4,351 |
Long-term Debt, at par less amortized discount | 0 | 0 |
Long-term debt | 4,002 | 4,351 |
Derivative Liability | 1,771 | 1,657 |
Liabilities | 5,773 | 6,009 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value | 3,029 | 2,957 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Municipal Bonds [Member] |  |  |
Fixed income securities, at fair value | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] |  |  |
Fixed income securities, at fair value | 131 | 164 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 0 | 0 |
Derivative assets | 0 | 0 |
Other assets | 1 | 2 |
Total assets | 133 | 167 |
Interest Payable | 0 | 0 |
Long-term debt | 0 | 0 |
Long-term Debt, at par less amortized discount | 167 | 203 |
Long-term debt | 167 | 203 |
Derivative Liability | 0 | 0 |
Liabilities | 167 | 203 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Corporate Debt Securities [Member] |  |  |
Fixed income securities, at fair value | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Municipal Bonds [Member] |  |  |
Fixed income securities, at fair value | $ 131 | $ 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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