Retirement Benefit Plans (Details) - Pension plans - USD ($) $ in Millions	3 Months Ended
	Jul. 26, 2019	Jul. 27, 2018
U.S.
Net Periodic Benefit Cost
Service cost	$ 26	$ 27
Interest cost	32	33
Expected return on plan assets	(56)	(54)
Amortization of net actuarial loss	14	19
Net periodic benefit cost	16	25
Non-U.S.
Net Periodic Benefit Cost
Service cost	15	15
Interest cost	7	7
Expected return on plan assets	(15)	(14)
Amortization of net actuarial loss	3	3
Net periodic benefit cost	$ 10	$ 11