Retirement Benefit Plans , Net Periodic Cost and AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 104	$ 107	$ 104
Interest cost	105	97	94
Expected return on plan assets	(160)	(141)	(128)
Amortization of prior service cost (credit)	0	1	(1)
Amortization of net actuarial loss	65	85	71
Net periodic benefit cost	114	149	140
Amounts Recognized in AOCI
Net actuarial loss	481
Amortization of prior service cost	0
Amortization of net actuarial gain	(65)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	416
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	530
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of net actuarial loss	98
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	60	54	43
Interest cost	33	29	27
Expected return on plan assets	(41)	(35)	(33)
Amortization of prior service cost (credit)	0	1	1
Amortization of net actuarial loss	12	11	8
Net periodic benefit cost	64	$ 60	$ 46
Amounts Recognized in AOCI
Net actuarial loss	199
Amortization of prior service cost	(1)
Amortization of net actuarial gain	(12)
Effect of exchange rates	(68)
Total recognized in accumulated other comprehensive loss	118
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	182
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of net actuarial loss	$ 22