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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Entity
consolidationVIE
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Entity
Jun. 30, 2021
USD ($)
consolidationVIE
Dec. 31, 2021
USD ($)
Entity
Variable Interest Entities [Line Items]          
Variable Interest Entity Change in Fair Value of Assets and Liabilities $ 1,000,000 $ 2,000,000 $ 1,000,000 $ 1,000,000  
Realized Investment Gains (Losses) 7,000,000 (2,000,000) 17,000,000 1,000,000  
Other Operating Income (Expense), Net 1,000,000 1,000,000 3,000,000 (1,000,000)  
Fair value of special purpose entities 0   0    
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (6,000,000) 2,000,000 15,000,000 $ 2,000,000  
Long-term debt $ 2,189,000,000   $ 2,189,000,000   $ 2,230,000,000
Number of Variable Interest Entities Consolidated During the Period     2 0  
Number of Variable Interest Entities Deconsolidated During Period | consolidationVIE 0     0  
Gain (loss) from consolidating VIEs $ 0 0 $ 28,000,000 $ 0  
Number of Trusts Established Resulting From Puerto Rico Restructuring Transaction     2    
Consolidated Entities [Member]          
Variable Interest Entities [Line Items]          
Number Of Consolidated Variable Interest Entities | Entity 8   8   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) 0 $ (2,000,000) 1,000,000  
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change 0 2,000,000 (1,000,000) 1,000,000  
Gross Investment Income, Operating (1,000,000) 2,000,000      
Interest Expense, Long-term Debt (5,000,000) (1,000,000) (7,000,000) (3,000,000)  
Long-term debt $ 3,340,000,000   $ 3,340,000,000   $ 4,216,000,000
Ambac UK [Member] | Consolidated Entities [Member]          
Variable Interest Entities [Line Items]          
Number Of Consolidated Variable Interest Entities | Entity 5   5   5
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Variable Interest Entities [Line Items]          
Long-term debt $ 3,184,000,000   $ 3,184,000,000   $ 4,056,000,000
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Variable Interest Entities [Line Items]          
Gross Investment Income, Operating     (5,000,000) 3,000,000  
Realized Investment Gains (Losses) 0 $ 0 1,000,000 $ 1,000,000  
Sitka AAC Note | Ambac Assurance Corporation [Member]          
Variable Interest Entities [Line Items]          
Long-term debt 1,156,000,000   1,156,000,000   1,154,000,000
Sitka AAC Note | Afg [Member]          
Variable Interest Entities [Line Items]          
Long-term debt $ 74,000,000   $ 74,000,000   $ 0