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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total revenues | $ 2,348 | $ 2,085 | $ 4,588 | $ 4,075
Costs and expenses | 2,100 | 1,974 | 4,301 | 3,900
Revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) related to cash flow hedges | 8 | 8 | 16 | 16
Costs and expenses |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) related to cash flow hedges | $ 6 | $ (3) | $ 0 | $ (4)

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