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Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 30, 2015 | Oct. 24, 2014 | Oct. 30, 2015 | Oct. 24, 2014 | Apr. 24, 2015
Schedule of Investments [Line Items] |  |  |  |  |
Marketable securities | $ 14,972 |  | $ 14,972 |  | $ 14,746
Cost | 484 |  | 484 |  | 520
Other expense, net [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Impairment, cost method investments | 19 | $ 13 | 21 | $ 13 |
Other assets [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Marketable securities | 202 |  | 202 |  | 186
Cost | 484 |  | 484 |  | 520
Debt securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Credit loss portion of other-than-temporary impairments | 0 |  | 0 |  | 0
Reductions for available-for-sale securities sold | 0 | 0 | 0 | 0 |
Other-than-temporary impairment losses on available-for-sale securities | 0 | 0 | 0 | 0 |
Marketable equity securities [Member] | Other expense, net [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Impairment charges, marketable securities | 0 | $ 7 | 20 | $ 7 |
Marketable equity securities [Member] | Other assets [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Marketable securities | $ 99 |  | $ 99 |  | $ 80

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