Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Oct. 31, 2024	Oct. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,474	$ 2,161	$ 1,855	$ 1,206	$ 897	$ 1,145	$ 1,855	$ 1,145
Other comprehensive income (loss) before reclassifications							(14)	(26)
Pre-tax loss reclassified from accumulated other comprehensive loss							(14)	(54)
Tax effects							2	8
Total other comprehensive loss	(11)	14	(29)	(59)	2	(15)	(26)	(72)
Ending balance	2,616	2,474	2,161	1,482	1,206	897	2,616	1,482
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(249)	(263)	(234)	(198)	(200)	(185)	(234)	(185)
Total other comprehensive loss	(11)	14	(29)	(59)	2	(15)
Ending balance	(260)	$ (249)	(263)	(257)	$ (198)	(200)	(260)	(257)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			23			64	23	64
Other comprehensive income (loss) before reclassifications							(5)	27
Pre-tax loss reclassified from accumulated other comprehensive loss							(13)	(52)
Tax effects							3	3
Total other comprehensive loss							(15)	(22)
Ending balance	8			42			8	42
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			20			18	20	18
Other comprehensive income (loss) before reclassifications							0	(1)
Pre-tax loss reclassified from accumulated other comprehensive loss							(1)	(1)
Tax effects							0	0
Total other comprehensive loss							(1)	(2)
Ending balance	19			16			19	16
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(24)			(19)	(24)	(19)
Other comprehensive income (loss) before reclassifications							0	1
Pre-tax loss reclassified from accumulated other comprehensive loss							0	(1)
Tax effects							0	0
Total other comprehensive loss							0	0
Ending balance	(24)			(19)			(24)	(19)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (253)			$ (248)	(253)	(248)
Other comprehensive income (loss) before reclassifications							(9)	(53)
Pre-tax loss reclassified from accumulated other comprehensive loss							0	0
Tax effects							(1)	5
Total other comprehensive loss							(10)	(48)
Ending balance	$ (263)			$ (296)			$ (263)	$ (296)