Revenues - Schedule of Change in Unearned Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Unearned Revenue [Roll Forward]
Unearned revenue, beginning of period	$ 16,555	$ 15,222	$ 20,743	$ 19,003
Billings and other	8,700	7,694	24,577	22,371
Unearned revenue, end of period	14,996	13,472	14,996	13,472
Revenue recognized over time
Unearned Revenue [Roll Forward]
Revenue recognized	(9,833)	(9,023)	(28,727)	(26,446)
Revenue recognized at a point in time
Unearned Revenue [Roll Forward]
Revenue recognized	$ (426)	$ (421)	$ (1,597)	$ (1,456)