Retirement Benefit Plans (Details) (USD $) In Millions	3 Months Ended
	Jul. 29, 2011	Jul. 30, 2010
United States Pension Plans Of US Entity Defined Benefit [Member]
Retirement Benefit Plans [Line Items]
Service cost	$ 23	$ 22
Interest cost	22	19
Expected return on plan assets	(30)	(26)
Amortization of net actuarial loss	11	8
Net periodic benefit cost	26	23
Total cost for the period	26	23
Foreign Pension Plans Defined Benefit [Member]
Retirement Benefit Plans [Line Items]
Service cost	11	9
Interest cost	7	6
Expected return on plan assets	(9)	(6)
Amortization of net actuarial loss	1
Net periodic benefit cost	10	10
Total cost for the period	10	10
Other Postretirement Benefit Plans Defined Benefit [Member]
Retirement Benefit Plans [Line Items]
Service cost	5	5
Interest cost	4	4
Expected return on plan assets	(4)	(3)
Amortization of net actuarial loss	1	1
Net periodic benefit cost	6	7
Total cost for the period	$ 6	$ 7