Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Apr. 30, 2022	Jan. 31, 2022	Jan. 31, 2021
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	$ 869	$ 779
Gross unrealized gains	10	20
Gross unrealized losses	(1)	(1)
Fair value	878	798
Money market funds \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	531	302
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	531	302
Commercial paper \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	117	55
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	117	55
Commercial paper \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	6	103
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	6	103
U.S. government securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	20	25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	20	25
U.S. government securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		13
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities		13
Agency discount notes \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	8	18
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	8	18
Other \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	8	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	8	4
Other \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	1	4
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	0
Convertible debt securities	3	4
Other \| Long-term Marketable Securities
Marketable securities:
Amortized Cost		1
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities		1
Corporate debt securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		18
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities		18
Corporate debt securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	28	61
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	28	61
Corporate debt securities \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	39	44
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	39	44
Asset backed securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	20	26
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	20	26
Certificates of deposit \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		6
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities		6
Certificates of deposit \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	10	14
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities	10	14
Mutual funds
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	78	74
Gross Unrealized Gains	8	16
Gross Unrealized Losses	(1)	(1)
Fair Value	85	89	$ 89
Convertible debt securities
Marketable securities:
Amortized Cost	3
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Convertible debt securities	3
Debt Securities, Trading and Available-for-sale [Abstract]
Fair Value	$ 3
Municipal bonds \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		11
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities		11
Common stock \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		0
Gross Unrealized Gains		4
Gross Unrealized Losses		0
Convertible debt securities		$ 4

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Debt Securities, Trading, Accumulated Gross Unrealized Gain, Before Tax

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Debt Securities, Trading, Accumulated Gross Unrealized Loss, Before Tax

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Fair Value, Assets Measured on Recurring Basis

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Investments, Accumulated Gross Unrealized Gain, Before Tax

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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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Amortized cost of 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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Amount of 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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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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