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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, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,147  
Fixed maturity securities, at fair value 2,285  
Amortized Cost, Due in one year or less 537  
Amortized Cost, Due after one year through five years 479  
Amortized Cost, Due after five years through ten years 400  
Amortized Cost, Due after ten years 173  
Amortized Cost, Total 1,589  
Estimated Fair Value, Due in one year or less 537  
Estimated Fair Value, Due after one year through five years 485  
Estimated Fair Value, Due after five years through ten years 409  
Estimated Fair Value, Due after ten years 193  
Estimated Fair Value due, Total 1,625  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, at fair value 1,797 $ 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 185  
Fixed maturity securities, at fair value 247 302
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 116  
Fixed maturity securities, at fair value 116 74
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 258  
Fixed maturity securities, at fair value $ 298 $ 303