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Acquisitions - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 18, 2018
Jan. 25, 2019
Jan. 26, 2018
Jan. 25, 2019
Jan. 26, 2018
Oct. 26, 2018
Apr. 27, 2018
Oct. 27, 2017
Apr. 28, 2017
Business Acquisition [Line Items]                  
Goodwill   $ 40,003,000,000   $ 40,003,000,000     $ 39,543,000,000    
Approximate payments expected to acquire business, net of existing stake and cash acquired       1,615,000,000 $ 111,000,000        
Fair value of contingent consideration   148,000,000 $ 171,000,000 148,000,000 171,000,000 $ 203,000,000 173,000,000 $ 190,000,000 $ 246,000,000
Other accrued expenses                  
Business Acquisition [Line Items]                  
Fair value of contingent consideration   99,000,000   99,000,000     108,000,000    
Other liabilities                  
Business Acquisition [Line Items]                  
Fair value of contingent consideration   49,000,000   49,000,000     $ 65,000,000    
IPR&D                  
Business Acquisition [Line Items]                  
In-process research and development acquired in connection with asset acquisition   0 $ 0 15,000,000 $ 0        
Mazor Robotics                  
Business Acquisition [Line Items]                  
Total consideration for the transaction, net of cash acquired $ 1,600,000,000                
Cash consideration 1,300,000,000                
Previously-held equity investment 246,000,000                
Intangible assets acquired 400,000,000                
Goodwill 1,214,000,000                
Costs incurred in connection with acquisition   $ 51,000,000   $ 51,000,000          
Mazor Robotics | Technology-Based Intangible Assets                  
Business Acquisition [Line Items]                  
Intangible assets acquired $ 384,000,000                
Estimated useful life 10 years                
Mazor Robotics | Tradenames                  
Business Acquisition [Line Items]                  
Intangible assets acquired $ 16,000,000                
Estimated useful life 10 years