Retirement Benefit Plans - Net Periodic Cost and AOCI (Details) - Pension benefits - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2021	Apr. 24, 2020	Apr. 26, 2019
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 106	$ 106	$ 109
Interest cost	109	126	129
Expected return on plan assets	(242)	(225)	(215)
Amortization of prior service cost	1	1	1
Amortization of net actuarial loss	69	56	76
Settlement loss (gain)	0	0	0
Special termination benefits	73	0	0
Net periodic benefit cost	115	64	100
Amounts Recognized in AOCI
Net actuarial gain	(373)
Amortization of prior service cost	(1)
Amortization and settlement recognition of actuarial loss	(69)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	(443)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	(328)
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	70	59	59
Interest cost	28	28	30
Expected return on plan assets	(59)	(58)	(57)
Amortization of prior service cost	(1)	(1)	(1)
Amortization of net actuarial loss	25	14	12
Settlement loss (gain)	1	0	(2)
Special termination benefits	0	0	0
Net periodic benefit cost	64	$ 42	$ 41
Amounts Recognized in AOCI
Net actuarial gain	(168)
Amortization of prior service cost	1
Amortization and settlement recognition of actuarial loss	(26)
Effect of exchange rates	61
Total recognized in accumulated other comprehensive loss	(132)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ (67)