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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, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,914  
Fixed income securities, at fair value 3,048  
Amortized Cost, Due in one year or less 830  
Amortized Cost, Due after one year through five years 876  
Amortized Cost, Due after five years through ten years 432  
Amortized Cost, Due after ten years 182  
Amortized Cost, Total 2,320  
Estimated Fair Value, Due in one year or less 832  
Estimated Fair Value, Due after one year through five years 888  
Estimated Fair Value, Due after five years through ten years 453  
Estimated Fair Value, Due after ten years 206  
Estimated Fair Value due, Total 2,379  
Fixed Income Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed income securities, at fair value 2,311 $ 2,577
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 251  
Fixed income securities, at fair value 296 248
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 74  
Fixed income securities, at fair value 73 146
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 268  
Fixed income securities, at fair value $ 300 $ 287