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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 2,160	$ 1,866	$ 6,235	$ 5,337
Costs and expenses	1,995	1,778	5,895	5,233
Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to cash flow hedges	7	16	23	49
Costs and expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to cash flow hedges	$ 3	$ 1	$ (2)	$ 2

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