Stockholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Oct. 31, 2022	Jul. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (352)			$ (352)
Net other comprehensive income (loss)	$ 2	1	$ 2	$ 8	3	$ 10
Ending balance	(349)				(349)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(239)			(239)
Net other comprehensive income (loss)	(6)		(12)		(11)	(22)
Ending balance	(250)				(250)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		37			37
Net other comprehensive income (loss)	6		10		10	24
Ending balance	47				47
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(150)			(150)
Net other comprehensive income (loss)	2		4		4	$ 8
Ending balance	(146)				$ (146)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net other comprehensive income (loss)	$ 2	$ 1	$ 2	$ 8