Fair Value Measurements , Valuation Techniques (Details) (Recurring, Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 25, 2014	Apr. 26, 2013
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	$ 127	$ 172
Total realized gains(losses) and other-than-temporary impairment losses included in earnings	(5)
Total unrealized gains (losses) included in other comprehensive income	4	11
Settlements	(20)	(56)
Ending balance	106	127
Corporate Debt Securities
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	10	10
Total realized gains(losses) and other-than-temporary impairment losses included in earnings	0
Total unrealized gains (losses) included in other comprehensive income	0	0
Settlements	(1)	0
Ending balance	9	10
Auction Rate Securities
Fair Value Inputs
Illiquidity premium	6.00%
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	103	127
Total realized gains(losses) and other-than-temporary impairment losses included in earnings	(5)
Total unrealized gains (losses) included in other comprehensive income	3	11
Settlements	(4)	(35)
Ending balance	97	103
Auction Rate Securities \| Minimum
Fair Value Inputs
Years to Principal Recovery	2 years
Auction Rate Securities \| Maximum
Fair Value Inputs
Years to Principal Recovery	12 years
Auction Rate Securities \| Weighted Average
Fair Value Inputs
Years to Principal Recovery	3 years
Mortgage Backed Securities
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	14	29
Total realized gains(losses) and other-than-temporary impairment losses included in earnings	0
Total unrealized gains (losses) included in other comprehensive income	1	0
Settlements	(15)	(15)
Ending balance	0	14
Other Asset-backed Securities
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs
Beginning balance	0	6
Total realized gains(losses) and other-than-temporary impairment losses included in earnings	0
Total unrealized gains (losses) included in other comprehensive income	0	0
Settlements	0	(6)
Ending balance	$ 0	$ 0

Illiquidity premium used as an input to measure fair value.

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- Definition

Number of years to principal recovery, used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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