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Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Detail2) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Investment [Line Items]    
Securities fair value $ 24 $ 23
Investment Portfolio [Member]    
Investment [Line Items]    
Fair Value of Cash and Securities Pledged to Derivative Counterparties 27 64
Standard & Poor's, B Rating    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors   403
Standard & Poor's, B Rating | Municipal Bonds [Member]    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors   10
Standard & Poor's, B Rating | Mortgage-Backed Securities, Other    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors   236
Standard & Poor's, B Rating | Asset-backed Securities [Member]    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors   $ 157
Standard & Poor's, B- Rating [Member]    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors 482  
Standard & Poor's, B- Rating [Member] | Municipal Bonds [Member]    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors 9  
Standard & Poor's, B- Rating [Member] | Mortgage-Backed Securities, Other    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors 240  
Standard & Poor's, B- Rating [Member] | Asset-backed Securities [Member]    
Investment [Line Items]    
Fair value of securities that include benefit of guarantees provided by financial guarantors $ 232