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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Apr. 27, 2018 | Apr. 28, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 2,738 | $ 2,677
Gross unrealized gains | 1 | 4
Gross unrealized losses | (44) | (4)
Estimated fair value | 2,695 | 2,677
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,861 | 1,535
Gross unrealized gains | 1 | 3
Gross unrealized losses | (39) | (2)
Estimated fair value | 1,823 | 1,536
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 497 | 629
Gross unrealized gains | 0 | 1
Gross unrealized losses | (5) | (2)
Estimated fair value | 492 | 628
Foreign Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 4 | 21
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 4 | 21
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 230 | 362
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 230 | 362
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 115 | 99
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 115 | 99
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 31 | 31
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 31 | $ 31

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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