Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Oct. 31, 2022	Jan. 31, 2022
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	$ 1,106	$ 779
Gross unrealized gains	6	20
Gross unrealized losses	(4)	(1)
Fair value	1,108	798
Money market funds \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	515	302
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	515	302
Commercial paper \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	299	55
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	299	55
Commercial paper \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	87	103
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	87	103
Certificates of deposit \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	21	6
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	21	6
Certificates of deposit \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		14
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities (6)		14
Agency discount notes \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	7
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Convertible debt securities (6)	7
Other \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	5	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	5	4
Other \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	8	4
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	10	4
Other \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	5	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	5	1
U.S. government securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		25
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities (6)		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 (6)		13
Custody cash deposit \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		18
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities (6)		18
Corporate debt securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		18
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities (6)		18
Corporate debt securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	35	61
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	35	61
Corporate debt securities \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	27	44
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Convertible debt securities (6)	26	44
Asset-backed securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	7	26
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Convertible debt securities (6)	7	26
Asset-backed securities \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	6
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Convertible debt securities (6)	6
Municipal bonds \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		11
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Convertible debt securities (6)		11
Common stock \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		0
Gross Unrealized Gains		4
Gross Unrealized Losses		0
Convertible debt securities (6)		4
Mutual funds
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	81	74
Gross Unrealized Gains	4	16
Gross Unrealized Losses	(3)	(1)
Fair Value	82	$ 89
Convertible debt securities
Marketable securities:
Amortized Cost	3
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Convertible debt securities (6)	3
Debt Securities, Trading and Available-for-sale [Abstract]
Fair Value	$ 3

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