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Fair Value Measurements (Equity Investments) (Details) - Recurring - USD ($) $ in Millions | Apr. 30, 2023 | Jan. 31, 2023
--- | --- | ---
Equity Investments [Line Items] |  |
Equity investments | $ 7,515 | $ 10,669
Inputs, Level 1 |  |
Equity Investments [Line Items] |  |
Equity investments | 3,433 | 5,099
Inputs, Level 2 |  |
Equity Investments [Line Items] |  |
Equity investments | $ 4,082 | $ 5,570

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