CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 222	$ 186	$ 383	$ 332
Other comprehensive income (loss), net of reclassifications:
Net (loss) gain on derivative instruments (net of tax effect of $1, $(4), $3, and $(12), respectively)	(13)	18	(26)	73
Change in net unrealized (loss) gain on available-for-sale debt securities (net of tax effect of zero for all periods presented)	(3)	4	(1)	3
Change in defined benefit pension items (net of tax effect of zero for all periods presented)	0	3	0	0
Net change in cumulative foreign currency translation gain (loss) (net of tax effect of zero, $1, $5, and $1, respectively)	18	(46)	14	(121)
Total other comprehensive income (loss)	2	(21)	(13)	(45)
Total comprehensive income	$ 224	$ 165	$ 370	$ 287