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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
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 1,983 $ 2,041
Fixed maturity securities, at fair value 1,923  
Amortized Cost, Due in one year or less 486  
Amortized Cost, Due after one year through five years 536  
Amortized Cost, Due after five years through ten years 297  
Amortized Cost, Due after ten years 53  
Amortized Cost, Total 1,371  
Estimated Fair Value, Due in one year or less 485  
Estimated Fair Value, Due after one year through five years 508  
Estimated Fair Value, Due after five years through ten years 268  
Estimated Fair Value, Due after ten years 47  
Estimated Fair Value due, Total 1,307  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,554 1,469
Fixed maturity securities, at fair value 1,494 1,395
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 231 230
Fixed maturity securities, at fair value 240 238
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 140 141
Fixed maturity securities, at fair value 137 137
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 226 227
Fixed maturity securities, at fair value $ 223 $ 224