Retirement Benefit Plans - Net Periodic Cost and AOCI (Details) - Pension benefits - USD ($) $ in Millions	12 Months Ended
	Apr. 24, 2020	Apr. 26, 2019	Apr. 27, 2018
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 106	$ 109	$ 116
Interest cost	126	129	117
Expected return on plan assets	(225)	(215)	(205)
Amortization of prior service cost	1	1	1
Amortization of net actuarial loss	56	76	82
Settlement loss (gain)	0	0	16
Net periodic benefit cost	64	100	127
Amounts Recognized in AOCI
Net actuarial gain	596
Prior service credit	(94)
Amortization of prior service cost	(1)
Amortization of net actuarial loss	(56)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	445
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	509
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	59	59	67
Interest cost	28	30	28
Expected return on plan assets	(58)	(57)	(53)
Amortization of prior service cost	(1)	(1)	0
Amortization of net actuarial loss	14	12	18
Settlement loss (gain)	0	(2)	0
Net periodic benefit cost	42	$ 41	$ 60
Amounts Recognized in AOCI
Net actuarial gain	236
Prior service credit	0
Amortization of prior service cost	1
Amortization of net actuarial loss	(14)
Effect of exchange rates	(11)
Total recognized in accumulated other comprehensive loss	212
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ 254