v3.26.1
Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Investment Holdings [Line Items]    
Interest income from marketable securities $ 109 $ 169
Privately held equity securities    
Investment Holdings [Line Items]    
Upward adjustments 330 21
Downward adjustments $ 112 $ 60