Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 25, 2013	Oct. 26, 2012	Oct. 25, 2013	Oct. 26, 2012
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 27	$ 26	$ 54	$ 52
Interest cost	24	23	48	46
Expected return on plan assets	(35)	(32)	(70)	(64)
Amortization of net actuarial loss	21	18	42	36
Net periodic benefit cost	37	35	74	70
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	14	11	28	22
Interest cost	7	7	14	14
Expected return on plan assets	(9)	(8)	(18)	(16)
Amortization of net actuarial loss	2	2	4	4
Net periodic benefit cost	14	12	28	24
Post-Retirement Benefits
Net Periodic Benefit Cost
Service cost	5	5	10	10
Interest cost	3	4	6	8
Expected return on plan assets	(5)	(4)	(10)	(8)
Amortization of net actuarial loss	0	1	0	2
Net periodic benefit cost	$ 3	$ 6	$ 6	$ 12