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Leases and Other Commitments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024	Jan. 31, 2025
Property, Plant and Equipment [Line Items]
Operating lease cost	$ 163	$ 162	$ 459	$ 513
Operating lease commitment balance, including leases not yet commenced	4,400		4,400
Accrued compensation	2,200		2,200		$ 2,800
Facilities Space
Property, Plant and Equipment [Line Items]
Operating lease commitment balance, including leases not yet commenced	$ 3,900		$ 3,900