Intangible Assets Acquired Through Business Combinations and Goodwill - Intangible Assets Acquired From Business Combinations (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	$ 6,860
Additions and retirements, net	6,113
Intangible assets, gross, ending balance	12,973	$ 6,860
Accumulated amortization, beginning balance	(2,746)
Expense and retirements, net	(1,249)
Accumulated amortization, ending balance	(3,995)	(2,746)
Intangible assets, net, beginning balance	4,114
Intangible assets, net, ending balance	$ 8,978	4,114
Weighted Average Remaining Useful Life (Years)	5 years 6 months
Amortization of intangible assets	$ 1,600	1,100	$ 800
Retirements of intangible assets	377
Customer contract assets	587	477
Other assets
Finite-lived Intangible Assets [Roll Forward]
Customer contract assets	79	42
Developed technology
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	3,305
Additions and retirements, net	2,328
Intangible assets, gross, ending balance	5,633	3,305
Accumulated amortization, beginning balance	(1,427)
Expense and retirements, net	(836)
Accumulated amortization, ending balance	(2,263)	(1,427)
Intangible assets, net, beginning balance	1,878
Intangible assets, net, ending balance	$ 3,370	1,878
Weighted Average Remaining Useful Life (Years)	3 years 8 months 12 days
Retirements of intangible assets	$ 61
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	3,510
Additions and retirements, net	3,485
Intangible assets, gross, ending balance	6,995	3,510
Accumulated amortization, beginning balance	(1,279)
Expense and retirements, net	(383)
Accumulated amortization, ending balance	(1,662)	(1,279)
Intangible assets, net, beginning balance	2,231
Intangible assets, net, ending balance	$ 5,333	2,231
Weighted Average Remaining Useful Life (Years)	6 years 7 months 6 days
Retirements of intangible assets	$ 314
Other purchased intangible assets
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, gross, beginning balance	45
Additions and retirements, net	300
Intangible assets, gross, ending balance	345	45
Accumulated amortization, beginning balance	(40)
Expense and retirements, net	(30)
Accumulated amortization, ending balance	(70)	(40)
Intangible assets, net, beginning balance	5
Intangible assets, net, ending balance	$ 275	$ 5
Weighted Average Remaining Useful Life (Years)	5 years 6 months