Restructuring - Summary of Restructuring Activities (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring charges	[1],[2]	$ 260	$ 56	$ 300	$ 163

[1] Amounts include amortization of intangible assets acquired through business combinations, as follows: Three Months Ended October 31,Nine Months Ended October 31,2025202420252024Cost of revenues$156 $131 $468 $600 Sales and marketing230 223 693 669 

[2] Amounts include stock-based compensation expense, as follows:  Three Months Ended October 31,Nine Months Ended October 31, 2025202420252024Cost of revenues$129 $135 $406 $386 Research and development271 278 826 814 Sales and marketing296 312 874 911 General and administrative109 95 291 267 Restructuring 14 0 29 2