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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jan. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 7,092	$ 6,638
Unrealized Gains	33	17
Unrealized Losses	(1)	(4)
Aggregate Fair Value	7,124	6,651
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	202	177
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	202	177
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,890	6,461
Unrealized Gains	33	17
Unrealized Losses	(1)	(4)
Aggregate Fair Value	6,922	6,474
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,050	2,069
Unrealized Gains	6	4
Unrealized Losses	0	(1)
Aggregate Fair Value	2,056	2,072
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	537	634
Unrealized Gains	1	2
Unrealized Losses	0	0
Aggregate Fair Value	538	636
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,943	3,532
Unrealized Gains	25	11
Unrealized Losses	(1)	(3)
Aggregate Fair Value	3,967	3,540
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	215	294
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	215	294
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	305	104
Unrealized Gains	1	0
Unrealized Losses	0	0
Aggregate Fair Value	306	104
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42	5
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	$ 42	$ 5

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