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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
Entity
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Entity
Variable Interest Entities [Line Items]      
Variable Interest Entity Change in Fair Value of Assets and Liabilities $ (1,000,000) $ 0  
Realized Investment Gains (Losses) 2,000,000 8,000,000  
Other Operating Income (Expense), Net 5,000,000 0  
Fair value of special purpose entities 1,000,000   $ 1,000,000
Variable Interest Entity, Measure of Activity, Income or Loss before Tax 0 3,000,000  
Long-term debt $ 2,661,000,000   2,739,000,000
Sponsored Variable Interest Entities [Member]      
Variable Interest Entities [Line Items]      
Total principal amount of debt outstanding     $ 410,000,000
Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number Of Consolidated Variable Interest Entities | Entity 6   6
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax $ 1,000,000 (4,000,000)  
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change (1,000,000) (4,000,000)  
Interest Expense, Long-term Debt (1,000,000) $ (2,000,000)  
Long-term debt $ 4,427,000,000   $ 4,493,000,000
Consolidated Variable Interest Entities [Member]      
Variable Interest Entities [Line Items]      
Number of DeConsolidated Variable Interest Entities 0 0  
Ambac UK [Member] | Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number Of Consolidated Variable Interest Entities | Entity 5   5
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Long-term debt $ 4,264,000,000   $ 4,324,000,000
Ambac Assurance [Member]      
Variable Interest Entities [Line Items]      
Carry Value Secured Notes from LSNI 464,000,000   465,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Gross Investment Income, Operating 2,000,000 $ 2,000,000  
Realized Investment Gains (Losses) 1,000,000 $ 8,000,000  
Ambac Note Post Exit From Rehabilitation [Member] | Ambac Assurance Corporation [Member]      
Variable Interest Entities [Line Items]      
Long-term debt $ 1,626,000,000   $ 1,641,000,000
5.1% Junior Surplus Notes, General Account Due 2020 | Ambac Assurance Corporation [Member]      
Variable Interest Entities [Line Items]      
Note Holders 1    
5.1% Junior Surplus Notes, General Account Due 2020 | Ambac Assurance Corporation [Member] | Corolla Notes      
Variable Interest Entities [Line Items]      
Note Holders 1