Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Oct. 31, 2025	Jul. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,988	$ 3,993	$ 3,465	$ 3,517	$ 3,993	$ 3,517
Net other comprehensive income (loss)	14	36	(27)	(43)	50	(70)
Ending balance	4,134	3,988	3,705	3,465	4,134	3,705
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(92)			(92)
Net other comprehensive income (loss)	9		(26)		34	(68)
Ending balance	(58)				(58)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(5)			(5)
Net other comprehensive income (loss)	2		(1)		4	(3)
Ending balance	(1)				(1)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(123)			(123)
Net other comprehensive income (loss)	3		0		12	1
Ending balance	(111)				(111)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(184)	(220)	(264)	(221)	(220)	(221)
Net other comprehensive income (loss)	14	36	(27)	(43)	50
Ending balance	$ (170)	$ (184)	$ (291)	$ (264)	$ (170)	$ (291)