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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Apr. 29, 2016
Schedule of Investments [Line Items]      
Marketable securities $ 9,831   $ 9,809
Cost 546   506
Other expense, net [Member]      
Schedule of Investments [Line Items]      
Impairment, cost method investments 3 $ 0  
Other assets [Member]      
Schedule of Investments [Line Items]      
Marketable securities 174   130
Cost 546   506
Debt securities [Member]      
Schedule of Investments [Line Items]      
Credit loss portion of other-than-temporary impairments 0   0
Reductions for available-for-sale securities sold 0 0  
Other-than-temporary impairment losses on available-for-sale securities 0 0  
Marketable equity securities [Member] | Other expense, net [Member]      
Schedule of Investments [Line Items]      
Impairment charges, marketable securities 0 $ 20  
Marketable equity securities [Member] | Other assets [Member]      
Schedule of Investments [Line Items]      
Marketable securities $ 129   $ 85