Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	Jul. 31, 2026	Jan. 31, 2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,749	$ 4,304
Gross Unrealized Gains	3	36
Gross Unrealized Losses	(10)	0
Aggregate Fair Value	2,742	4,340
Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	398
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	0	398
Location, Statement of Financial Position, Balance [Axis]: us-gaap:MarketableSecuritiesCurrent
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,749	3,906
Gross Unrealized Gains	3	36
Gross Unrealized Losses	(10)	0
Aggregate Fair Value	2,742	3,942
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	758	1,820
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(2)	0
Aggregate Fair Value	756	1,831
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	125	265
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Aggregate Fair Value	125	266
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,693	1,874
Gross Unrealized Gains	3	22
Gross Unrealized Losses	(8)	0
Aggregate Fair Value	1,688	1,896
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		164
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Aggregate Fair Value		164
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	145	155
Gross Unrealized Gains	0	2
Gross Unrealized Losses	0	0
Aggregate Fair Value	145	157
Supranational securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28	26
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 28	$ 26

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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