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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, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,005  
Fixed maturity securities, at fair value 2,036  
Amortized Cost, Due in one year or less 683  
Amortized Cost, Due after one year through five years 431  
Amortized Cost, Due after five years through ten years 317  
Amortized Cost, Due after ten years 41  
Amortized Cost, Total 1,472  
Estimated Fair Value, Due in one year or less 683  
Estimated Fair Value, Due after one year through five years 416  
Estimated Fair Value, Due after five years through ten years 300  
Estimated Fair Value, Due after ten years 39  
Estimated Fair Value due, Total 1,438  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, at fair value 1,383 $ 1,730
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 179  
Fixed maturity securities, at fair value 225 252
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 121  
Fixed maturity securities, at fair value 120 128
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 232  
Fixed maturity securities, at fair value $ 252 $ 265