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Financial Instruments - Investments by Category and Related Balance Sheet Presentation (Details) - USD ($) $ in Millions | Apr. 24, 2020 | Apr. 26, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Cost | $ 6,847 | $ 5,540
Unrealized Gains | 135 | 20
Unrealized Losses | (141) | (61)
Fair Value | 6,841 | 5,499
Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 6,808 | 5,455
Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 33 | 44
Level 1 | U.S. government and agency securities |  |
Schedule of Investments [Line Items] |  |
Cost | 542 | 529
Unrealized Gains | 47 | 1
Unrealized Losses | 0 | (7)
Fair Value | 589 | 523
Level 1 | U.S. government and agency securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 589 | 523
Level 1 | U.S. government and agency securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 |  |
Schedule of Investments [Line Items] |  |
Cost | 6,269 | 4,964
Unrealized Gains | 88 | 19
Unrealized Losses | (138) | (51)
Fair Value | 6,219 | 4,932
Level 2 | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 6,219 | 4,932
Level 2 | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 | U.S. government and agency securities |  |
Schedule of Investments [Line Items] |  |
Cost | 746 | 387
Unrealized Gains | 1 | 1
Unrealized Losses | 0 | (7)
Fair Value | 747 | 381
Level 2 | U.S. government and agency securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 747 | 381
Level 2 | U.S. government and agency securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 | Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Cost | 4,285 | 3,500
Unrealized Gains | 66 | 14
Unrealized Losses | (90) | (21)
Fair Value | 4,261 | 3,493
Level 2 | Corporate debt securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 4,261 | 3,493
Level 2 | Corporate debt securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 | Mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Cost | 705 | 537
Unrealized Gains | 20 | 3
Unrealized Losses | (28) | (20)
Fair Value | 697 | 520
Level 2 | Mortgage-backed securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 697 | 520
Level 2 | Mortgage-backed securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 | Non-U.S. government and agency securities |  |
Schedule of Investments [Line Items] |  |
Cost | 34 | 11
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 34 | 11
Level 2 | Non-U.S. government and agency securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 34 | 11
Level 2 | Non-U.S. government and agency securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 | Other asset-backed securities |  |
Schedule of Investments [Line Items] |  |
Cost | 499 | 529
Unrealized Gains | 1 | 1
Unrealized Losses | (20) | (3)
Fair Value | 480 | 527
Level 2 | Other asset-backed securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 480 | 527
Level 2 | Other asset-backed securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Auction rate securities |  |
Schedule of Investments [Line Items] |  |
Cost | 36 | 47
Unrealized Gains | 0 | 0
Unrealized Losses | (3) | (3)
Fair Value | 33 | 44
Level 3 | Auction rate securities | Investments |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Auction rate securities | Other Assets |  |
Schedule of Investments [Line Items] |  |
Fair Value | $ 33 | $ 44

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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