Retirement Benefit Plans (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 29, 2011	Apr. 30, 2010	Apr. 24, 2009
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	$ 396	$ 363
Projected benefit obligation	437	393
Plan assets at fair value	193	183
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets Abstract
Projected benefit obligation	474	675
Plan assets at fair value	225	420
Weighted average assumptions - projected benefit obligation:
Initial healthcare cost trend rate pre-65	7.75%
Initial healthcare cost trend rate post-65	7.50%
United States Pension Plans of US Entity, Defined Benefit [Member]
Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Disclosure [Line Items]
Amortization of prior service cost	(1)
Amortization of net actuarial loss	(45)
Total	44
United States Pension Plans of US Entity, Defined Benefit [Member]
Net Periodic Benefit Costs Disclosure [Line Items]
Service cost	87	63	74
Interest cost	77	68	60
Expected return on plan assets	(106)	(100)	(99)
Amortization of prior service costs	(2)	(1)	(1)
Amortization of net actuarial loss	34	2	6
Net periodic benefit cost	90	32	40
Special termination benefits	13	7
Defined Benefit Plan, Total Cost for Period	103	39	40
United States Pension Plans of US Entity, Defined Benefit [Member]
Weighted average assumptions - projected benefit obligation:
Discount rate	5.80%	6.05%	8.25%
Rate of compensation increase	3.80%	3.80%	4.00%
Weighted average assumptions - net periodic benefit cost:
Discount rate	6.05%	8.25%	6.75%
Expected return on plan assets	8.25%	8.25%	8.75%
Rate of compensation increase	3.80%	4.00%	4.24%
Defined Benefit Plan, Plan Assets, Target Allocations [Abstract]
Equity securities	50.00%	55.00%
Debt securities	20.00%	20.00%
Other	30.00%	25.00%
Total	100.00%	100.00%
Foreign Pension Plans, Defined Benefit [Member]
Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Disclosure [Line Items]
Amortization of prior service cost	2
Amortization of net actuarial loss	(4)
Total	6
Foreign Pension Plans, Defined Benefit [Member]
Net Periodic Benefit Costs Disclosure [Line Items]
Service cost	39	27	29
Interest cost	26	22	19
Expected return on plan assets	(27)	(24)	(20)
Amortization of prior service costs	1	1	1
Amortization of net actuarial loss	5	1
Curtailment gain		(1)
Net periodic benefit cost	44	26	29
Defined Benefit Plan, Total Cost for Period	44	26	29
Foreign Pension Plans, Defined Benefit [Member]
Weighted average assumptions - projected benefit obligation:
Discount rate	4.75%	4.68%	5.41%
Rate of compensation increase	2.97%	3.05%	2.90%
Weighted average assumptions - net periodic benefit cost:
Discount rate	4.68%	5.41%	5.37%
Expected return on plan assets	5.71%	5.78%	5.97%
Rate of compensation increase	3.05%	2.90%	3.10%
Defined Benefit Plan, Plan Assets, Target Allocations [Abstract]
Equity securities	41.00%	40.00%
Debt securities	23.00%	15.00%
Other	36.00%	45.00%
Total	100.00%	100.00%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Disclosure [Line Items]
Amortization of prior service cost
Amortization of net actuarial loss	(4)
Total	4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Periodic Benefit Costs Disclosure [Line Items]
Service cost	18	12	14
Interest cost	16	14	12
Expected return on plan assets	(13)	(9)	(12)
Amortization of net actuarial loss	5	2
Net periodic benefit cost	26	19	14
Special termination benefits	2	2
Defined Benefit Plan, Total Cost for Period	$ 28	$ 21	$ 14
Other Postretirement Benefit Plans, Defined Benefit [Member]
Weighted average assumptions - projected benefit obligation:
Discount rate	5.80%	6.05%	8.25%
Initial healthcare cost trend rate pre-65	7.75%	8.00%	8.50%
Initial healthcare cost trend rate post-65	7.50%	7.75%	8.50%
Weighted average assumptions - net periodic benefit cost:
Discount rate	6.05%	8.25%	6.75%
Expected return on plan assets	8.25%	8.25%	8.75%
Initial healthcare cost trend rate pre-65	8.00%	8.50%	9.00%
Initial healthcare cost trend rate post-65	7.75%	8.00%	9.00%

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The initial trend rate for health care costs post-65.

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The initial trend rate for health care costs pre-65.

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Defined benefit plan net periodic benefit cost, the initial trend rate for health care costs post-65.

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Defined benefit plan net periodic benefit cost, the initial trend rate for health care costs pre-65.

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Total target allocation percentage presented on a weighted-average basis as of the measurement date of the latest statement of financial position

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The total cost for the period includes the total amount of net periodic benefit cost for defined benefit plans and the special termination benefits cost.

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The amount of gains or losses recognized in net periodic benefit cost

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented (including the net gain or loss, net prior service cost or credit, and net transition asset or obligation).

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- Definition

The interest rate used to adjust for the time value of money for the plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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- Definition

Expected rate of compensation increases (for pay-related plans).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The interest rate used to adjust for the time value of money.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Expected rate of compensation increases (for pay-related plans).

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-Name Statement of Financial Accounting Standard (FAS)
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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

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 total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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-Publisher FASB
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If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The amount of net gain or loss recognized in net periodic benefit cost as a result of 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 88
-Paragraph 6

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 88
-Paragraph 15

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Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(2)

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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