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Fair Value Measurements (Equity Investments) (Details) - Recurring - USD ($) $ in Millions | Jul. 31, 2025 | Jan. 31, 2025
--- | --- | ---
Fair Value, Equity Investments [Line Items] |  |
Equity investments | $ 4,563 | $ 3,041
Inputs, Level 1 |  |
Fair Value, Equity Investments [Line Items] |  |
Equity investments | 1,097 | 959
Inputs, Level 2 |  |
Fair Value, Equity Investments [Line Items] |  |
Equity investments | $ 3,466 | $ 2,082

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