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Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 24 $ 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 764 400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 85 53
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109 106
Debt Securities , Available for sale, Continuous Unrealized Loss Position, 593 869
Debt Securities, Available for sale, Unrealized Loss Position, Including Pledged Securities 1,357 1,269
Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 37 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 37 86
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 0 0
Ambac Insured Securities | Parsed Fixed Income Securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 5,000  
Fixed Income Investments And Other Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 109 106
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 556 791
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 24 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 764 392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 85 53
Debt Securities, Available-for-sale, Unrealized Loss Position 1,319 1,183
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109 106
Fixed Income Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 22 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 1
Debt Securities, Available-for-sale, Unrealized Loss Position 38 28
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2 2
Fixed Income Securities [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 209 280
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 447 279
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 53 42
Debt Securities, Available-for-sale, Unrealized Loss Position 656 559
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 62 63
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 838,000  
Fixed Income Securities [Member] | Debt Security, Government, Non-US [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 36 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 47 47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9 7
Debt Securities, Available-for-sale, Unrealized Loss Position 83 73
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11 9
Fixed Income Securities [Member] | US Government Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 27 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 40 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 1
Debt Securities, Available-for-sale, Unrealized Loss Position 66 58
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 4 4
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 74 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 91 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15 0
Debt Securities, Available-for-sale, Unrealized Loss Position 165 132
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 17 19
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 15 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 15 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 90
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 117 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3 1
Debt Securities, Available-for-sale, Unrealized Loss Position 117 126
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3 4
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 173 198
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 6 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1 1
Debt Securities, Available-for-sale, Unrealized Loss Position 179 203
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 10 5
Debt Securities Available for Sale Unrealized Loss Measured as a Percent of Amortized Cost 5.00%  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 18,000  
Fixed Income Securities [Member] | Ambac Insured Securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 16  
Debt Securities Available for Sale Unrealized Loss Measured as a Percent of Amortized Cost 13.00%  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 14,000  
Collateral Pledged [Member] | Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 0 0
Collateral Pledged [Member] | Fixed Income Securities [Member] | Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 0 $ 0