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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,069 $ 2,197
Fixed maturity securities, at fair value 2,073  
Amortized Cost, Due in one year or less 441  
Amortized Cost, Due after one year through five years 510  
Amortized Cost, Due after five years through ten years 307  
Amortized Cost, Due after ten years 177  
Amortized Cost, Total 1,436  
Estimated Fair Value, Due in one year or less 439  
Estimated Fair Value, Due after one year through five years 498  
Estimated Fair Value, Due after five years through ten years 289  
Estimated Fair Value, Due after ten years 176  
Estimated Fair Value due, Total 1,402  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,737 1,744
Fixed maturity securities, at fair value 1,740 1,710
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 255 239
Fixed maturity securities, at fair value 281 250
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 24  
Fixed maturity securities, at fair value 24  
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 113 139
Fixed maturity securities, at fair value 113 139
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 242 301
Fixed maturity securities, at fair value $ 252 $ 303