Revenues - Schedule of Change in Unearned Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Unearned Revenue [Roll Forward]
Unearned revenue, beginning of period	$ 17,799	$ 16,061	$ 20,743	$ 19,003
Billings and other	8,992	8,486	15,877	14,677
Unearned revenue, end of period	16,555	15,222	16,555	15,222
Revenue recognized over time
Unearned Revenue [Roll Forward]
Revenue recognized	(9,684)	(8,852)	(18,895)	(17,423)
Revenue recognized at a point in time
Unearned Revenue [Roll Forward]
Revenue recognized	$ (552)	$ (473)	$ (1,170)	$ (1,035)