Financial Instruments - Narrative (Details) - USD ($)	9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Allowance for credit loss	$ 0		$ 0
Write offs of accrued interest receivables	0	$ 0
Direct investments in privately held companies	$ 167,000,000		$ 177,000,000