Intangible Assets Acquired Through Business Combinations and Goodwill - Summary of Intangible Assets Acquired From Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	$ 10,183
Additions and retirements, net	0
Intangible assets, gross, ending balance	10,183
Accumulated amortization, beginning balance	(5,755)
Expense and retirements, net	(395)
Accumulated amortization, ending balance	(6,150)
Intangible assets, net, beginning balance	4,428
Intangible assets, net, ending balance	$ 4,033
Weighted Average Remaining Useful Life (Years)	2 years 8 months 12 days
Amortization of intangible assets	$ 395	$ 461
Acquired developed technology
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	2,958
Additions and retirements, net	0
Intangible assets, gross, ending balance	2,958
Accumulated amortization, beginning balance	(1,753)
Expense and retirements, net	(162)
Accumulated amortization, ending balance	(1,915)
Intangible assets, net, beginning balance	1,205
Intangible assets, net, ending balance	$ 1,043
Weighted Average Remaining Useful Life (Years)	8 months 12 days
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	$ 6,894
Additions and retirements, net	0
Intangible assets, gross, ending balance	6,894
Accumulated amortization, beginning balance	(3,820)
Expense and retirements, net	(216)
Accumulated amortization, ending balance	(4,036)
Intangible assets, net, beginning balance	3,074
Intangible assets, net, ending balance	$ 2,858
Weighted Average Remaining Useful Life (Years)	3 years 4 months 24 days
Other
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	$ 331
Additions and retirements, net	0
Intangible assets, gross, ending balance	331
Accumulated amortization, beginning balance	(182)
Expense and retirements, net	(17)
Accumulated amortization, ending balance	(199)
Intangible assets, net, beginning balance	149
Intangible assets, net, ending balance	$ 132
Weighted Average Remaining Useful Life (Years)	2 years 2 months 12 days