Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 26	$ 27	$ 52	$ 54
Interest cost	26	24	52	48
Expected return on plan assets	(39)	(35)	(78)	(70)
Amortization of net actuarial loss	16	21	32	42
Net periodic benefit cost	29	37	58	74
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	15	14	30	28
Interest cost	8	7	16	14
Expected return on plan assets	(10)	(9)	(20)	(18)
Amortization of net actuarial loss	3	2	6	4
Net periodic benefit cost	16	14	32	28
Post-Retirement Benefits
Net Periodic Benefit Cost
Service cost	5	5	10	10
Interest cost	4	3	8	6
Expected return on plan assets	(6)	(5)	(12)	(10)
Amortization of net actuarial loss	0	0	0	0
Net periodic benefit cost	$ 3	$ 3	$ 6	$ 6