CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 146	$ 156
Other comprehensive (loss) income, net of reclassifications:
Net gain on derivative instruments (net of tax effect of $(8) and $(2), respectively)	55	10
Change in net unrealized (loss) gain on available-for-sale debt securities (net of tax effect of zero for all periods presented)	(1)	4
Change in defined benefit pension items (net of tax effect of zero for all periods presented)	(3)	0
Net change in cumulative foreign currency translation (loss) gain (net of tax effect of zero and $(2), respectively)	(75)	10
Total other comprehensive (loss) income	(24)	24
Total comprehensive income	$ 122	$ 180