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Cash Equivalents and Investments - Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Millions	Jul. 31, 2023	Jan. 31, 2023
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 1,983	$ 2,473
Unrealized Gain	0	0
Unrealized Loss	(10)	(24)
Estimated Fair Value	1,973	2,449
Cash Equivalents
Cash and Cash Equivalents [Line Items]
Amortized Cost	223	133
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	223	133
Cash Equivalents | Money market funds
Cash and Cash Equivalents [Line Items]
Amortized Cost	223	133
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	223	133
Short-term investments (Available-for-sale)
Cash and Cash Equivalents [Line Items]
Amortized Cost	1,760	2,340
Unrealized Gain	0	0
Unrealized Loss	(10)	(24)
Estimated Fair Value	1,750	2,316
Short-term investments (Available-for-sale) | U.S. treasury securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	1,730	2,207
Unrealized Gain	0	0
Unrealized Loss	(10)	(22)
Estimated Fair Value	1,720	2,185
Short-term investments (Available-for-sale) | Corporate debt securities
Cash and Cash Equivalents [Line Items]
Amortized Cost	30	133
Unrealized Gain	0	0
Unrealized Loss	0	(2)
Estimated Fair Value	$ 30	$ 131

X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amount, before tax, of unrealized loss 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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