Retirement Benefit Plans , Net Periodic Cost and AOCI (Details) - Pension benefits - USD ($) $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 109	$ 116	$ 117
Interest cost	129	117	109
Expected return on plan assets	(215)	(205)	(195)
Amortization of prior service cost	1	1	1
Amortization of net actuarial loss	76	82	88
Settlement loss (gain)	0	16	0
Special termination benefits	0	0	60
Net periodic benefit cost	100	127	180
Amounts Recognized in AOCI
Net actuarial gain	205
Amortization of prior service cost	(1)
Amortization of net actuarial loss	(76)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	128
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	228
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	59	67	70
Interest cost	30	28	26
Expected return on plan assets	(57)	(53)	(48)
Amortization of prior service cost	(1)	0	(1)
Amortization of net actuarial loss	12	18	17
Settlement loss (gain)	(2)	0	0
Special termination benefits	0	0	0
Net periodic benefit cost	41	$ 60	$ 64
Amounts Recognized in AOCI
Net actuarial gain	113
Amortization of prior service cost	1
Amortization of net actuarial loss	(12)
Effect of exchange rates	(29)
Total recognized in accumulated other comprehensive loss	73
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ 114