Retirement Benefit Plans , Net Periodic Cost and AOCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 26, 2013	Apr. 27, 2012	Apr. 29, 2011
Net Periodic Benefit Cost
Total cost for period	$ 419	$ 319	$ 368
U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	104	92	87
Interest cost	94	87	77
Expected return on plan assets	(128)	(121)	(106)
Amortization of prior service costs (credit)	(1)	(1)	(2)
Amortization of net actuarial loss	71	45	34
Net periodic benefit cost	140	102	90
Special termination benefits	0	0	13
Total cost for period	140	102	103
Amounts Recognized in AOCI
Net actuarial loss (gain)	150
Prior service cost (credit)	0
Amortization of prior service cost	1
Amortization of net actuarial gain	(71)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	80
Total recognized in net periodic pension cost and accumulated other comprehensive loss	220
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	1
Amortization of net actuarial loss	85
Total amounts that will be amortized from AOCI in next fiscal year	86
Non-U.S. Pension Benefits
Net Periodic Benefit Cost
Service cost	43	42	39
Interest cost	27	29	26
Expected return on plan assets	(33)	(36)	(27)
Amortization of prior service costs (credit)	1	1	1
Amortization of net actuarial loss	8	4	5
Net periodic benefit cost	46	40	44
Special termination benefits	0	0	0
Total cost for period	46	40	44
Amounts Recognized in AOCI
Net actuarial loss (gain)	29
Prior service cost (credit)	(8)
Amortization of prior service cost	0
Amortization of net actuarial gain	(8)
Effect of exchange rates	(5)
Total recognized in accumulated other comprehensive loss	8
Total recognized in net periodic pension cost and accumulated other comprehensive loss	54
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	0
Amortization of net actuarial loss	11
Total amounts that will be amortized from AOCI in next fiscal year	11
Post-Retirement Benefits
Net Periodic Benefit Cost
Service cost	19	19	18
Interest cost	15	17	16
Expected return on plan assets	(17)	(16)	(13)
Amortization of prior service costs (credit)	0	0	0
Amortization of net actuarial loss	3	3	5
Net periodic benefit cost	20	23	26
Special termination benefits	0	0	2
Total cost for period	20	23	28
Amounts Recognized in AOCI
Net actuarial loss (gain)	(63)
Prior service cost (credit)	0
Amortization of prior service cost	0
Amortization of net actuarial gain	(3)
Effect of exchange rates	0
Total recognized in accumulated other comprehensive loss	(66)
Total recognized in net periodic pension cost and accumulated other comprehensive loss	(46)
Estimated Amounts That Will be Amortized from AOCI in Next Fiscal Year
Amortization of prior service cost/(credit)	0
Amortization of net actuarial loss	1
Total amounts that will be amortized from AOCI in next fiscal year	$ 1