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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
Entity
consolidationVIE
Mar. 31, 2022
USD ($)
consolidationVIE
Dec. 31, 2022
USD ($)
Entity
Variable Interest Entities [Line Items]      
Variable Interest Entity Change in Fair Value of Assets and Liabilities $ 3,000,000 $ (1,000,000)  
Realized Investment Gains (Losses) (4,000,000) 10,000,000  
Other Operating Income (Expense), Net 3,000,000 2,000,000  
Fair value of special purpose entities 0    
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (1,000,000) $ 22,000,000  
Long-term debt $ 497,000,000   $ 639,000,000
Number of Variable Interest Entities Consolidated During the Period 0 2  
Number of Variable Interest Entities Deconsolidated During Period | consolidationVIE 1 0  
Gain (loss) from consolidating VIEs $ 0 $ 28,000,000  
Number of Trusts Established Resulting From Puerto Rico Restructuring Transaction 2    
Variable Interest Entity Deconsolidation Gain Loss $ 0    
Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number Of Consolidated Variable Interest Entities | Entity 8   9
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 $ 0 (1,000,000)  
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change 3,000,000 (1,000,000)  
Gross Investment Income, Operating 2,000,000 (4,000,000)  
Interest Expense, Long-term Debt (5,000,000) (2,000,000)  
Long-term debt $ 3,060,000,000   $ 3,107,000,000
Ambac UK [Member] | Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number Of Consolidated Variable Interest Entities | Entity 4   5
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Long-term debt $ 2,869,000,000   $ 2,788,000,000
Ambac Assurance [Member] | Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number Of Consolidated Variable Interest Entities | Entity 4   4
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Long-term debt $ 191,000,000   $ 319,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Realized Investment Gains (Losses) $ 0 $ 1,000,000