CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 161	$ 146
Other comprehensive loss, net of reclassifications:
Net (loss) gain on derivative instruments (net of tax effect of $2 and $(8), respectively)	(13)	55
Change in net unrealized gain (loss) on available-for-sale debt securities (net of tax effect of zero for all periods presented)	2	(1)
Change in defined benefit pension items (net of tax effect of zero for all periods presented)	0	(3)
Net change in cumulative foreign currency translation loss (net of tax effect of $5 and zero respectively)	(4)	(75)
Total other comprehensive loss	(15)	(24)
Total comprehensive income	$ 146	$ 122