Financial Instruments - Financial Instruments by Significant Investment Category (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023
Cash equivalents
Amortized Cost	$ 1,892.0	$ 1,947.0
Long-term
Total, amortized cost	1,797.0	1,279.0
Total, Gross unrealized gains	13.0	7.0
Total, Gross unrealized losses	(1.0)	(5.0)
Total, fair value	1,809.0	1,281.0
Commercial paper
Short-term
Amortized Cost	159.0	42.0
Fair Value	159.0	42.0
Corporate debt securities
Short-term
Amortized Cost	75.0	44.0
Fair Value	75.0	44.0
Long-term
Amortized Cost	103.0	45.0
Gross Unrealized Gains	1.0	0.0
Gross Unrealized Losses	0.0	0.0
Marketable securities, long-term	104.0	45.0
U.S. government securities
Short-term
Amortized Cost	70.0	17.0
Fair Value	70.0	17.0
Long-term
Amortized Cost	24.0	35.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Marketable securities, long-term	24.0	35.0
Asset backed securities
Short-term
Amortized Cost	28.0	19.0
Fair Value	28.0	19.0
Long-term
Amortized Cost	59.0	13.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Marketable securities, long-term	59.0	13.0
Other
Short-term
Amortized Cost	22.0	3.0
Fair Value	22.0	3.0
Long-term
Amortized Cost	11.0	9.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Marketable securities, long-term	11.0	9.0
Agency mortgage-backed securities
Long-term
Amortized Cost	36.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Marketable securities, long-term	36.0
Mutual funds
Long-term
Other investments	89.0	81.0
Other investments, gross unrealized gains	12.0	6.0
Other investments, gross unrealized losses	(1.0)	(1.0)
Other investments, fair value	100.0	86.0
Convertible debt securities
Long-term
Other investments		3.0
Other investments, gross unrealized gains		1.0
Other investments, gross unrealized losses		(2.0)
Other investments, fair value		2.0
Strategic investments derivative asset
Long-term
Other investments		2.0
Other investments, gross unrealized gains		0.0
Other investments, gross unrealized losses		(2.0)
Other investments, fair value		0.0
Money market funds
Cash equivalents
Amortized Cost	693.0	737.0
Fair Value	693.0	737.0
Commercial paper
Cash equivalents
Amortized Cost	250.0	169.0
Fair Value	250.0	169.0
U.S. government securities
Cash equivalents
Amortized Cost	92.0	13.0
Fair Value	92.0	13.0
Certificates of deposit
Cash equivalents
Amortized Cost	80.0	35.0
Fair Value	80.0	35.0
Other
Cash equivalents
Amortized Cost	6.0	12.0
Fair Value	$ 6.0	$ 12.0

Cash Equivalents And Marketable Securities

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Debt Securities, Available-for-Sale, Current

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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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