Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2024	Jul. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,161	$ 1,855	$ 897	$ 1,145	$ 1,855	$ 1,145
Other comprehensive income (loss) before reclassifications					(10)	20
Pre-tax loss reclassified from accumulated other comprehensive loss					(6)	(41)
Tax effects					1	8
Total other comprehensive income (loss)	14	(29)	2	(15)	(15)	(13)
Ending balance	2,474	2,161	1,206	897	2,474	1,206
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(263)	(234)	(200)	(185)	(234)	(185)
Total other comprehensive income (loss)	14	(29)	2	(15)
Ending balance	(249)	(263)	(198)	(200)	(249)	(198)
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					2	11
Pre-tax loss reclassified from accumulated other comprehensive loss					(6)	(40)
Tax effects					1	3
Total other comprehensive income (loss)					(3)	(26)
Ending balance	20		38		20	38
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					1	0
Pre-tax loss reclassified from accumulated other comprehensive loss					0	(1)
Tax effects					0	0
Total other comprehensive income (loss)					1	(1)
Ending balance	21		17		21	17
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	0
Pre-tax loss reclassified from accumulated other comprehensive loss					0	0
Tax effects					0	0
Total other comprehensive income (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					(13)	9
Pre-tax loss reclassified from accumulated other comprehensive loss					0	0
Tax effects					0	5
Total other comprehensive income (loss)					(13)	14
Ending balance	$ (266)		$ (234)		$ (266)	$ (234)