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Financial Instruments , Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Schedule of Investments [Line Items]      
Reductions for available-for-sale securities sold $ 0    
Investments in marketable equity securities 8,889 $ 9,809  
Aggregate carrying amount of equity and other securities without a quoted market price that are accounted for using the cost or equity method 589 506  
Other expense, net      
Schedule of Investments [Line Items]      
Cost-method investment impairment charges 30 23 $ 7
Special (gains) charges, net      
Schedule of Investments [Line Items]      
Cost-method investment impairment charges   70  
Other assets      
Schedule of Investments [Line Items]      
Investments in marketable equity securities 148 130  
Aggregate carrying amount of equity and other securities without a quoted market price that are accounted for using the cost or equity method 589 506  
Debt      
Schedule of Investments [Line Items]      
Credit loss portion of other-than-temporary impairments 0 0  
Reductions for available-for-sale securities sold   0  
Marketable equity securities | Other expense, net      
Schedule of Investments [Line Items]      
Impairment of investments   20 $ 7
Marketable equity securities | Other assets      
Schedule of Investments [Line Items]      
Investments in marketable equity securities $ 103 $ 85