Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 838	$ 903	$ 827
Other comprehensive income (loss), net of tax:
Currency translation adjustments	(60)	123	(94)
Cash flow hedge adjustments	53	(76)	30
Postretirement benefits adjustments	77	78	(77)
Net other comprehensive income (loss)	70	125	(141)
Comprehensive income	$ 908	$ 1,028	$ 686