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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 28, 2017 | Jul. 29, 2016 | Apr. 28, 2017
Schedule of Investments [Line Items] |  |  |
Carrying amount of cost and equity method investments | $ 627,000,000 |  | $ 589,000,000
Impairment, cost method investments | 0 | $ 0 |
Other assets |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying amount of cost and equity method investments | 627,000,000 |  | 589,000,000
Debt securities |  |  |
Schedule of Investments [Line Items] |  |  |
Credit loss portion of other-than-temporary impairments | 0 |  | 0
Reductions for available-for-sale securities sold | 0 | 0 |
Marketable equity securities | Other expense, net |  |  |
Schedule of Investments [Line Items] |  |  |
Impairment charges, marketable securities | 0 | $ 0 |
Marketable equity securities | Other assets |  |  |
Schedule of Investments [Line Items] |  |  |
Marketable securities | $ 101,000,000 |  | $ 103,000,000

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