Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	Jul. 31, 2026	Jan. 31, 2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,104	$ 2,223
Unrealized Gains	1	16
Unrealized Losses	(12)	(1)
Fair Value	3,093	2,238
Corporate notes and obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,570	1,343
Unrealized Gains	1	10
Unrealized Losses	(7)	0
Fair Value	1,564	1,353
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	743	168
Unrealized Gains	0	2
Unrealized Losses	(3)	0
Fair Value	740	170
Mortgage-backed obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36	32
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Fair Value	35	31
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	563	618
Unrealized Gains	0	4
Unrealized Losses	(1)	0
Fair Value	562	622
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18	17
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	18	17
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	104	30
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	104	30
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	70	15
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 70	$ 15

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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