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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, 2021
Dec. 31, 2020
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss $ 25,515 $ 27,998
Insurance Assets 2,228 2,314
Insurance Liabilities 1,018 1,122
Derivative Liabilities 5  
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entities [Line Items]    
Derivative Liabilities   8
Global Public Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 20,320 21,646
Insurance Assets 248 263
Insurance Liabilities 261 287
Derivative Liabilities 0 0
Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 5,195 6,352
Insurance Assets 1,980 2,051
Insurance Liabilities 757 834
Derivative Liabilities 5 8
Global Structured Finance [Member] | Residential Mortgage-Backed Securities [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 3,501 4,308
Insurance Assets 1,958 2,024
Insurance Liabilities 513 580
Derivative Liabilities 0 0
Global Structured Finance [Member] | Other Consumer Asset-Backed [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 839 1,050
Insurance Assets 19 24
Insurance Liabilities 233 239
Derivative Liabilities 0 0
Global Structured Finance [Member] | Other [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 855 994
Insurance Assets 3 3
Insurance Liabilities 11 15
Derivative Liabilities $ 5 $ 8