Financial Instruments - financial Instruments by Significant Investment Category (Details) - USD ($) $ in Millions	Jan. 31, 2023	Jan. 31, 2022
Debt Securities, Trading and Available-for-Sale [Abstract]
Amortized cost	$ 1,279	$ 779
Gross unrealized gains	7	20
Gross unrealized losses	(5)	(1)
Fair value	1,281	798
Money market funds \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	737	302
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	737	302
Commercial paper \| Short-term
Marketable securities:
Fair Value	42	103
Commercial paper \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	169	55
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	169	55
Commercial paper \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	42	103
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	42	103
Certificates of deposit \| Short-term
Marketable securities:
Fair Value		14
Certificates of deposit \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	35	6
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	35	6
Certificates of deposit \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		14
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		14
U.S. government securities \| Short-term
Marketable securities:
Fair Value	17	13
U.S. government securities \| Long-term
Marketable securities:
Fair Value	35
U.S. government securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	13	25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	13	25
U.S. government securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		13
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		13
U.S. government securities \| Short-term Marketable Securities \| Short-term
Marketable securities:
Amortized Cost	17
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	17
U.S. government securities \| Long-term Marketable Securities \| Long-term
Marketable securities:
Amortized Cost	35
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	35
Other
Marketable securities:
Amortized Cost		4
Gross Unrealized Gains
Gross Unrealized Losses		0
Fair Value		4
Other \| Short-term
Marketable securities:
Fair Value	3	4
Other \| Long-term
Marketable securities:
Fair Value	9	1
Other \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost	12	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	12	4
Other \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	3
Gross Unrealized Gains
Gross Unrealized Losses	0
Fair Value	3
Other \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	9	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	9	1
Custody cash deposit \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		18
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		18
Corporate debt securities \| Short-term
Marketable securities:
Fair Value	44	61
Corporate debt securities \| Long-term
Marketable securities:
Fair Value	45	44
Corporate debt securities \| Cash and Cash Equivalents
Marketable securities:
Amortized Cost		18
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		18
Corporate debt securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	44	61
Gross Unrealized Gains	0	0
Gross Unrealized Losses
Fair Value	44	61
Corporate debt securities \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	45	44
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	45	44
Asset backed securities \| Short-term
Marketable securities:
Fair Value	19	26
Asset backed securities \| Long-term
Marketable securities:
Fair Value	13
Asset backed securities \| Short-term Marketable Securities
Marketable securities:
Amortized Cost	19	26
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	19	26
Asset backed securities \| Long-term Marketable Securities
Marketable securities:
Amortized Cost	13
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	13
Municipal bonds \| Short-term
Marketable securities:
Fair Value		11
Municipal bonds \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		11
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		11
Common Stock \| Short-term
Marketable securities:
Fair Value		4
Common Stock \| Short-term Marketable Securities
Marketable securities:
Amortized Cost		0
Gross Unrealized Gains		4
Gross Unrealized Losses		0
Fair Value		4
Mutual funds
Debt Securities, Trading and Available-for-Sale [Abstract]
Amortized Cost	81	74
Gross Unrealized Gains	6	16
Gross Unrealized Losses	(1)	(1)
Fair Value	86	$ 89
Convertible debt securities
Marketable securities:
Amortized Cost	3
Gross Unrealized Gains	1
Gross Unrealized Losses	(2)
Fair Value	2
Debt Securities, Trading and Available-for-Sale [Abstract]
Fair Value	2
Strategic investments derivative asset
Marketable securities:
Amortized Cost	2
Gross Unrealized Gains	0
Gross Unrealized Losses	(2)
Fair Value	$ 0

Amortized Cost Securities

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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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