Retirement Benefit Plans, Net Periodic Cost and AOCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Net Periodic Benefit Cost
Total cost for period	$ 319	$ 368	$ 237
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	92	87	63
Interest cost	87	77	68
Expected return on plan assets	(121)	(106)	(100)
Amortization of prior service costs	(1)	(2)	(1)
Amortization of net actuarial loss	45	34	2
Curtailment gain	0	0	0
Net periodic benefit cost	102	90	32
Special termination benefits	0	13	7
Total cost for period	102	103	39
Amounts Recognized in AOCI
Net actuarial loss/(gain)	326
Prior service cost/(credit)	0
Amortization of prior service cost	1
Amortization of net actuarial gain	(45)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	282
Total recognized in net periodic pension cost and accumulated other comprehensive loss	384
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	0
Amortization of net actuarial loss	71
Total amounts that will be amortized from AOCI in next fiscal year	71
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	42	39	27
Interest cost	29	26	22
Expected return on plan assets	(36)	(27)	(24)
Amortization of prior service costs	1	1	1
Amortization of net actuarial loss	4	5	1
Curtailment gain	0	0	(1)
Net periodic benefit cost	40	44	26
Special termination benefits	0	0	0
Total cost for period	40	44	26
Amounts Recognized in AOCI
Net actuarial loss/(gain)	59
Prior service cost/(credit)	(4)
Amortization of prior service cost	(1)
Amortization of net actuarial gain	(4)
Effect of exchange rates	(11)
Total recognized in accumulated other comprehensive loss	39
Total recognized in net periodic pension cost and accumulated other comprehensive loss	79
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	1
Amortization of net actuarial loss	8
Total amounts that will be amortized from AOCI in next fiscal year	9
Post-Retirement Benefits
Net Periodic Benefit Cost
Service cost	18	18	12
Interest cost	17	16	14
Expected return on plan assets	(16)	(13)	(9)
Amortization of prior service costs	0	0	0
Amortization of net actuarial loss	4	5	2
Curtailment gain	0	0	0
Net periodic benefit cost	23	26	19
Special termination benefits	0	2	2
Total cost for period	23	28	21
Amounts Recognized in AOCI
Net actuarial loss/(gain)	29
Prior service cost/(credit)	0
Amortization of prior service cost	0
Amortization of net actuarial gain	(4)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	25
Total recognized in net periodic pension cost and accumulated other comprehensive loss	48
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	0
Amortization of net actuarial loss	5
Total amounts that will be amortized from AOCI in next fiscal year	$ 5