Retirement Benefit Plans (Details) - Pension plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
U.S.
Net Periodic Benefit Cost
Service cost	$ 26	$ 27	$ 78	$ 81
Interest cost	32	33	96	99
Expected return on plan assets	(56)	(54)	(168)	(162)
Amortization of net actuarial loss	14	19	42	57
Net periodic benefit cost	16	25	48	75
Non-U.S.
Net Periodic Benefit Cost
Service cost	15	15	45	45
Interest cost	7	7	21	21
Expected return on plan assets	(15)	(14)	(45)	(42)
Amortization of net actuarial loss	4	3	11	9
Net periodic benefit cost	$ 11	$ 11	$ 32	$ 33