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Derivative Instruments - Pre-tax Gains (Losses) Associated with Cash Flow Hedges (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]
Gains (losses) recognized in OCI	$ (2)	$ (20)	$ (164)	$ 11
Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	8	8	16	16
Costs and expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	6	(3)	0	(4)
Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to non-designated hedges	$ (12)	$ (3)	$ (12)	$ (1)

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