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Debt (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jul. 05, 2023 | Jul. 06, 2026 | Dec. 31, 2020 | Jun. 07, 2020
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 2,215 |  |  | $ 2,739 |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months | 780 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two | 0 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three | 0 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four | 0 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five | 1,175 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five | $ 366 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.90% |  |  |  | 10.10%
Rep & Warranty Subrogation Recoveries Up To | $ 1,400 |  |  |  |
Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 2,322 |  |  | 2,884 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (107) |  |  | (145) |
Long-term debt | $ 2,215 |  |  | 2,739 |
Ambac Assurance Corporation [Member] | 5.1 Surplus Notes General Account Due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.10% |  |  |  |
Ambac Assurance Corporation [Member] | 5.1 Junior Surplus Notes General Account Due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.10% |  |  |  |
5.1 Junior Surplus Notes General Account Due 2020 | Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 0 |  |  | 365 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0 |  |  | (118) |
Long-term debt | 0 |  |  | 247 |
5.1 Surplus Notes General Account Due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregated Par Amount Reissued | 249 |  |  |  |
5.1 Surplus Notes General Account Due 2020 | Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 780 |  |  | 531 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (58) |  |  | 0 |
Long-term debt | 722 |  |  | 531 |
Ambac Note Post Exit From Rehabilitation [Member] | Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 0 |  |  | 1,641 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0 |  |  | 0 |
Long-term debt | $ 0 |  |  | 1,641 |
Sitka AAC Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.70% |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |  |
Make Whole Percentage of Principal |  | 103.00% | 103.00% |  |
Sitka AAC Note | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 4.50% |  |  |  |
Sitka AAC Note | London Interbank Offered Rate (LIBOR) | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 0.75% |  |  |  |
Sitka AAC Note | Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 1,175 |  |  | 0 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (23) |  |  | 0 |
Long-term debt | 1,152 |  |  | 0 |
Tier 2 Notes | Ambac Assurance Corporation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 326 |  |  | 306 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0 |  |  | 0 |
Long-term debt | 326 |  |  | 306 |
Secured Debt | Ambac UK [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 41 |  |  | 41 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (26) |  |  | (27) |
Long-term debt | $ 14 |  |  | $ 14 |

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