v3.25.4
Investments - Equity Securities At Fair Value (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities, at fair value $ 13,866 $ 13,832
Equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity method investment 4,230 5,040
Fair value option    
Debt and Equity Securities, FV-NI [Line Items]    
Gains/(losses) recognized on equity securities $ (108) $ (172)
Corporate Equity Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 78.00% 75.00%
Real estate    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 22.00% 25.00%
Corporate and Real estate    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 100.00% 100.00%
Public and Private equity    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 100.00% 100.00%
Public equity    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 4.00% 6.00%
Private equity    
Debt and Equity Securities, FV-NI [Line Items]    
Percentage of investment in equity securities 96.00% 94.00%