v3.26.1
Investments - Debt Instruments At Fair Value (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities, at fair value $ 10,320 $ 11,072
Corporate debt securities    
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities, at fair value 6,560 7,039
Securities backed by real estate    
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities, at fair value 314 312
Money market instruments    
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities, at fair value 2,125 2,333
Other    
Debt and Equity Securities, FV-NI [Line Items]    
Debt securities, at fair value $ 1,321 $ 1,388