Retirement Benefit Plans (Details) - Pension plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 25, 2019	Oct. 26, 2018	Oct. 25, 2019	Oct. 26, 2018
U.S.
Net Periodic Benefit Cost
Service cost	$ 26	$ 27	$ 52	$ 54
Interest cost	32	33	64	66
Expected return on plan assets	(56)	(54)	(112)	(108)
Amortization of net actuarial loss	14	19	28	38
Net periodic benefit cost	16	25	32	50
Non-U.S.
Net Periodic Benefit Cost
Service cost	15	15	30	30
Interest cost	7	7	14	14
Expected return on plan assets	(15)	(14)	(30)	(28)
Amortization of net actuarial loss	4	3	7	6
Net periodic benefit cost	$ 11	$ 11	$ 21	$ 22