Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 28, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010
U.S. Pension Benefits [Member]
Net Periodic Benefit Cost
Service cost	$ 23	$ 22	$ 46	$ 44
Interest cost	22	19	44	38
Expected return on plan assets	(30)	(26)	(60)	(52)
Amortization of net actuarial loss	11	8	22	16
Net periodic benefit cost	26	23	52	46
Non-U.S. Pension Benefits [Member]
Net Periodic Benefit Cost
Service cost	11	9	22	18
Interest cost	7	6	14	12
Expected return on plan assets	(9)	(6)	(18)	(12)
Amortization of net actuarial loss	1	1	2	2
Net periodic benefit cost	10	10	20	20
Post-Retirement Benefits [Member]
Net Periodic Benefit Cost
Service cost	5	5	10	10
Interest cost	4	4	8	8
Expected return on plan assets	(4)	(3)	(8)	(6)
Amortization of net actuarial loss	1	1	2	2
Net periodic benefit cost	$ 6	$ 7	$ 12	$ 14