Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2025	Jul. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,617	$ 2,621	$ 2,161	$ 1,855	$ 2,621	$ 1,855
Other comprehensive (loss) income before reclassifications					50	(10)
Pre-tax loss reclassified from accumulated other comprehensive loss					(17)	(6)
Tax effects					(2)	1
Total other comprehensive income (loss)	(6)	37	14	(29)	31	(15)
Ending balance	2,715	2,617	2,474	2,161	2,715	2,474
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(248)	(285)	(263)	(234)	(285)	(234)
Total other comprehensive income (loss)	(6)	37	14	(29)
Ending balance	(254)	(248)	(249)	(263)	(254)	(249)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		24		23	24	23
Other comprehensive (loss) income before reclassifications					(15)	2
Pre-tax loss reclassified from accumulated other comprehensive loss					(17)	(6)
Tax effects					3	1
Total other comprehensive income (loss)					(29)	(3)
Ending balance	(5)		20		(5)	20
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		20		20	20	20
Other comprehensive (loss) income before reclassifications					1	1
Pre-tax loss reclassified from accumulated other comprehensive loss					0	0
Tax effects					0	0
Total other comprehensive income (loss)					1	1
Ending balance	21		21		21	21
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(25)		(24)	(25)	(24)
Other comprehensive (loss) income before reclassifications					1	0
Pre-tax loss reclassified from accumulated other comprehensive loss					0	0
Tax effects					0	0
Total other comprehensive income (loss)					1	0
Ending balance	(24)		(24)		(24)	(24)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ (304)		$ (253)	(304)	(253)
Other comprehensive (loss) income before reclassifications					63	(13)
Pre-tax loss reclassified from accumulated other comprehensive loss					0	0
Tax effects					(5)	0
Total other comprehensive income (loss)					58	(13)
Ending balance	$ (246)		$ (266)		$ (246)	$ (266)