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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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