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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, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,739  
Fixed maturity securities, at fair value 2,858  
Amortized Cost, Due in one year or less 617  
Amortized Cost, Due after one year through five years 906  
Amortized Cost, Due after five years through ten years 455  
Amortized Cost, Due after ten years 183  
Amortized Cost, Total 2,160  
Estimated Fair Value, Due in one year or less 618  
Estimated Fair Value, Due after one year through five years 912  
Estimated Fair Value, Due after five years through ten years 459  
Estimated Fair Value, Due after ten years 209  
Estimated Fair Value due, Total 2,197  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, at fair value 2,341 $ 2,317
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 219  
Fixed maturity securities, at fair value 269 302
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 97  
Fixed maturity securities, at fair value 97 74
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 262  
Fixed maturity securities, at fair value $ 295 $ 303