Retirement Benefit Plans (Details) - Pension plans - USD ($) $ in Millions	3 Months Ended
	Jul. 27, 2018	Jul. 28, 2017
U.S.
Net Periodic Benefit Cost
Service cost	$ 27	$ 29
Interest cost	33	30
Expected return on plan assets	(54)	(52)
Amortization of net actuarial loss	19	20
Net periodic benefit cost	25	27
Non-U.S.
Net Periodic Benefit Cost
Service cost	15	17
Interest cost	7	7
Expected return on plan assets	(14)	(13)
Amortization of net actuarial loss	3	4
Net periodic benefit cost	$ 11	$ 15