Retirement Benefit Plans (Details) (USD $) In Millions	12 Months Ended
Apr. 29, 2011	Apr. 30, 2010
Funded status at end of year:
Underfunded status of the plan	$ 253	$ 411
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year:	1,342	1,146
Defined Benefit Plan, Change in Benefit Obligation [Abstract]
Projected benefit obligation at beginning of year	1,284	842
Service cost	87	63
Interest cost	77	68
Employee contributions
Plan amendments	8
Plan curtailments
Actuarial loss/(gain)	80	336
Benefits paid	(33)	(32)
Medicare Part D reimbursements
Special termination benefits	13	7
Foreign currency exchange rate changes
Projected benefit obligation at end of year	1,516	1,284
Defined Benefit Plan, Change in Fair Value of Plan Assets [Abstract]
Fair value of plan assets at beginning of year	1,104	833
Actual (loss)/return on plan assets	141	222
Employer contributions	180	81
Employee contributions
Benefits paid	33	32
Foreign currency exchange rate changes
Fair value of plan assets at end of year	1,392	1,104
Funded status at end of year:
Fair value of plan assets	1,392	1,104
Benefit obligations	1,516	1,284
Underfunded status of the plan	(124)	(180)
Recognized liability	(124)	(180)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets	46
Current liabilities	(7)	(5)
Non-current liabilities	(163)	(175)
Recognized liability	(124)	(180)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit)/cost	4	(6)
Net actuarial loss	688	677
Ending balance	692	671
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year:	526	434
Defined Benefit Plan, Change in Benefit Obligation [Abstract]
Projected benefit obligation at beginning of year	539	373
Service cost	39	27
Interest cost	25	22
Employee contributions	12	10
Plan amendments	2	3
Plan curtailments		(2)
Actuarial loss/(gain)	(41)	112
Benefits paid	(6)	(17)
Medicare Part D reimbursements
Special termination benefits
Foreign currency exchange rate changes	68	11
Projected benefit obligation at end of year	638	539
Defined Benefit Plan, Change in Fair Value of Plan Assets [Abstract]
Fair value of plan assets at beginning of year	420	291
Actual (loss)/return on plan assets	14	79
Employer contributions	102	47
Employee contributions	(12)	(10)
Benefits paid	6	17
Foreign currency exchange rate changes	64	10
Fair value of plan assets at end of year	606	420
Funded status at end of year:
Fair value of plan assets	606	420
Benefit obligations	638	539
Underfunded status of the plan	(32)	(119)
Recognized liability	(32)	(119)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets	45
Current liabilities	(2)	(2)
Non-current liabilities	(75)	(117)
Recognized liability	(32)	(119)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit)/cost	13	10
Net actuarial loss	130	148
Ending balance	143	158
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year:	295	270
Defined Benefit Plan, Change in Benefit Obligation [Abstract]
Projected benefit obligation at beginning of year	270	174
Service cost	18	12
Interest cost	16	14
Employee contributions	7	7
Plan amendments	(4)
Plan curtailments
Actuarial loss/(gain)	1	74
Benefits paid	(16)	(13)
Medicare Part D reimbursements	1
Special termination benefits	2	2
Foreign currency exchange rate changes
Projected benefit obligation at end of year	295	270
Defined Benefit Plan, Change in Fair Value of Plan Assets [Abstract]
Fair value of plan assets at beginning of year	158	108
Actual (loss)/return on plan assets	21	30
Employer contributions	28	26
Employee contributions	(7)	(7)
Benefits paid	16	13
Foreign currency exchange rate changes
Fair value of plan assets at end of year	198	158
Funded status at end of year:
Fair value of plan assets	198	158
Benefit obligations	295	270
Underfunded status of the plan	(97)	(112)
Recognized liability	(97)	(112)
Amounts recognized on the consolidated balance sheet consist of:
Non-current assets
Current liabilities	(1)
Non-current liabilities	(96)	(112)
Recognized liability	(97)	(112)
Amounts recognized in accumulated other comprehensive (loss)/income:
Prior service (benefit)/cost	(3)	2
Net actuarial loss	83	95
Ending balance	$ 80	$ 97

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. The projected benefit obligation is measured using assumptions as to future compensation levels if the pension benefit formula is based on those future compensation levels (pay-related, final-pay, final-average-pay, or career-average-pay plans). For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Prior to an employee's full eligibility date, the accumulated postretirement benefit obligation as of a particular date for an employee is the portion of the expected postretirement benefit obligation attributed to that employee's service rendered to that date; on and after the full eligibility date, the accumulated and expected postretirement benefit obligations for an employee are the same.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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The amount of contributions made by the employer.

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The amount of contributions made by plan participants. Under a contributory plan active employees or retirees contribute part of the cost. In some contributory plans, those wishing to be covered must contribute; in others, the contributions result in increased benefits.

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- Definition

The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets.

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The amount of increase or decrease in the benefit obligation attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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