Investments - Realized and Unrealized Gains (Losses) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jan. 31, 2026 |
Jan. 31, 2025 |
Jan. 31, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Net realized gains (losses) recognized on equity investments sold | $ 64 | $ (6) | $ 6 |
| Net unrealized losses recognized on equity investments held as of the end of the period | (5) | (12) | (30) |
| Total net gains (losses) recognized in Other income, net | $ 59 | $ (18) | $ (24) |