Shareholders' Equity (Details)	12 Months Ended		26 Months Ended
	Apr. 30, 2021 $ / shares € / shares shares	Apr. 24, 2020 $ / shares shares	Apr. 30, 2021 USD ($)	Apr. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)
Class of Stock [Line Items]
Common stock, authorized (in shares)		2,600,000,000		2,600,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Deferred stock, shares authorized (in shares)				40,000
Deferred stock, par value (in euros per share) | € / shares	€ 1.00
Preferred stock, authorized (in shares)				127,500,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.20
Deferred stock, issued (in shares)				0
Deferred stock, outstanding (in shares)				0
Preferred stock, issued (in shares)				0
Preferred stock, outstanding (in shares)				0
Shares repurchased (in shares)	4,000,000	12,000,000
Average repurchase price (in dollars per share) | $ / shares	€ 126.80	$ 106.22
Amount authorized for repurchase | $					$ 6,000,000,000.0
Amount repurchased | $			$ 608,000,000
Amount available for future repurchases | $				$ 5,400,000,000
Series A Preferred Shares
Class of Stock [Line Items]
Preferred stock, authorized (in shares)				500,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 1.00
Preferred stock, outstanding (in shares)				1,872