Restructuring - Summary of Restructuring Activities (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring charges	[1],[2]	$ 4	$ 99	$ 40	$ 107

[1] Amounts include amortization of intangible assets acquired through business combinations, as follows: Three Months Ended July 31,Six Months Ended July 31,2025202420252024Cost of revenues$150 $231 $312 $469 Sales and marketing230 223 463 446 

[2] Amounts include stock-based compensation expense, as follows:  Three Months Ended July 31,Six Months Ended July 31, 2025202420252024Cost of revenues$126 $132 $277 $251 Research and development280 276 555 536 Sales and marketing293 309 578 599 General and administrative94 91 182 172 Restructuring 0 2 15 2