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Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss $ 20,131 $ 20,861
Insurance Assets 320 351
Insurance Liabilities 750 836
Derivative Liabilities 0  
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entities [Line Items]    
Derivative Liabilities   0
Global Public Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 17,198 17,498
Insurance Assets 198 209
Insurance Liabilities 192 202
Derivative Liabilities 0 0
Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 2,933 3,364
Insurance Assets 122 141
Insurance Liabilities 558 634
Derivative Liabilities 0 0
Global Structured Finance [Member] | Residential Mortgage-Backed Securities [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 2,158 2,391
Insurance Assets 118 135
Insurance Liabilities 426 432
Derivative Liabilities 0 0
Global Structured Finance [Member] | Other Consumer Asset-Backed [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 343 540
Insurance Assets 2 5
Insurance Liabilities 130 200
Derivative Liabilities 0 0
Global Structured Finance [Member] | Other [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 432 433
Insurance Assets 2 2
Insurance Liabilities 2 2
Derivative Liabilities $ 0 $ 0