Retirement Benefit Plans , Change in Benefit Obligation and Funded Status (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 26, 2013	Apr. 27, 2012	Apr. 29, 2011
Funded status at end of year:
Underfunded status of the plan	$ (584)	$ (621)
Amounts recognized on the consolidated balance sheet consist of:
Non-current liabilities	(752)	(759)
Plans with accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation	2,003	1,737
Projected benefit obligation	2,243	1,955
Plan asset at fair value	1,740	1,481
Plans with projected benefit obligations in excess of plan assets
Projected benefit obligation	2,637	2,456
Plan assets at fair value	2,104	1,950
U.S. Pension Benefits
Defined Benefit Plan Disclosure
Accumulated benefit obligation at end of year	1,924	1,673
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	1,877	1,516
Service cost	104	92	87
Interest cost	94	87	77
Employee contributions	0	0
Plan amendments	0	0
Actuarial loss (gain)	151	230
Benefits paid	(72)	(48)
Medicare Part D reimbursements	0	0
Foreign currency exchange rate changes	0	0
Projected benefit obligation at end of year	2,154	1,877	1,516
Change in plan assets:
Fair value of plan assets at beginning of year	1,470	1,392
Actual return on plan assets	129	25
Employer contributions	190	101
Employee contributions	0	0
Benefits paid	(72)	(48)
Foreign currency exchange rate changes	0	0
Fair value of plan assets at end of year	1,717	1,470	1,392
Funded status at end of year:
Fair value of plan assets	1,717	1,470	1,392
Benefit obligations	2,154	1,877	1,516
Underfunded status of the plan	(437)	(407)
Recognized liability	(437)	(407)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets	0	0
Current liabilities	(9)	(8)
Non-current liabilities	(428)	(399)
Recognized liability	(437)	(407)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit) cost	5	5
Net actuarial loss	1,048	969
Ending balance	1,053	974
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure
Accumulated benefit obligation at end of year	689	589
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	717	638
Service cost	43	42	39
Interest cost	27	29	26
Employee contributions	15	14
Plan amendments	(8)	(4)
Actuarial loss (gain)	65	72
Benefits paid	(25)	(25)
Medicare Part D reimbursements	0	0
Foreign currency exchange rate changes	(23)	(49)
Projected benefit obligation at end of year	811	717	638
Change in plan assets:
Fair value of plan assets at beginning of year	638	606
Actual return on plan assets	69	49
Employer contributions	49	39
Employee contributions	15	14
Benefits paid	(25)	(25)
Foreign currency exchange rate changes	(13)	(45)
Fair value of plan assets at end of year	733	638	606
Funded status at end of year:
Fair value of plan assets	733	638	606
Benefit obligations	811	717	638
Underfunded status of the plan	(78)	(79)
Recognized liability	(78)	(79)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets	19	20
Current liabilities	(4)	(2)
Non-current liabilities	(93)	(97)
Recognized liability	(78)	(79)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit) cost	(1)	6
Net actuarial loss	190	175
Ending balance	189	181
Post-Retirement Benefits
Defined Benefit Plan Disclosure
Accumulated benefit obligation at end of year	302	339
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	339	295
Service cost	19	19	18
Interest cost	15	17	16
Employee contributions	9	9
Plan amendments	0	0
Actuarial loss (gain)	(62)	16
Benefits paid	(19)	(18)
Medicare Part D reimbursements	1	1
Foreign currency exchange rate changes	0	0
Projected benefit obligation at end of year	302	339	295
Change in plan assets:
Fair value of plan assets at beginning of year	204	198
Actual return on plan assets	19	4
Employer contributions	20	11
Employee contributions	9	9
Benefits paid	(19)	(18)
Foreign currency exchange rate changes	0	0
Fair value of plan assets at end of year	233	204	198
Funded status at end of year:
Fair value of plan assets	233	204	198
Benefit obligations	302	339	295
Underfunded status of the plan	(69)	(135)
Recognized liability	(69)	(135)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets	0	0
Current liabilities	(1)	(1)
Non-current liabilities	(68)	(134)
Recognized liability	(69)	(135)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit) cost	(3)	(3)
Net actuarial loss	43	108
Ending balance	$ 40	$ 105