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Acquisitions , Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 08, 2019
Dec. 18, 2018
Jul. 28, 2017
Apr. 26, 2019
Apr. 27, 2018
Apr. 28, 2017
Business Acquisition [Line Items]            
Goodwill       $ 39,959,000,000 $ 39,543,000,000 $ 38,515,000,000
Purchase accounting adjustments. increase to goodwill         54,000,000  
Fair value of contingent consideration       222,000,000 173,000,000 $ 246,000,000
Other liabilities            
Business Acquisition [Line Items]            
Fair value of contingent consideration       149,000,000 65,000,000  
Other accrued expenses            
Business Acquisition [Line Items]            
Fair value of contingent consideration       73,000,000 108,000,000  
IPR&D            
Business Acquisition [Line Items]            
In-process research and development acquired in connection with asset acquisition       $ 38,000,000 0  
Minimum            
Business Acquisition [Line Items]            
Estimated useful life       3 years    
Maximum            
Business Acquisition [Line Items]            
Estimated useful life       20 years    
All Business Acquisitions            
Business Acquisition [Line Items]            
Intangible assets acquired       $ 771,000,000    
Goodwill       1,510,000,000 52,000,000  
Net assets acquired       2,372,000,000 152,000,000  
Assets acquired       2,549,000,000 156,000,000  
Liabilities assumed       177,000,000 4,000,000  
All Business Acquisitions | Technology-Based Intangible Assets            
Business Acquisition [Line Items]            
Intangible assets acquired         $ 47,000,000  
All Business Acquisitions | Technology-Based Intangible Assets | Minimum            
Business Acquisition [Line Items]            
Estimated useful life         10 years  
All Business Acquisitions | Technology-Based Intangible Assets | Maximum            
Business Acquisition [Line Items]            
Estimated useful life         12 years  
All Business Acquisitions | Customer-Related Intangible Assets            
Business Acquisition [Line Items]            
Intangible assets acquired         $ 48,000,000  
Estimated useful life         7 years  
Mazor Robotics            
Business Acquisition [Line Items]            
Total consideration for the transaction, net of cash acquired, including previously-held equity investment   $ 1,600,000,000        
Cash consideration   1,300,000,000        
Previously-held equity investment   246,000,000        
Intangible assets acquired   399,000,000        
Goodwill   1,197,000,000        
Costs incurred in connection with acquisition       $ 51,000,000    
Net assets acquired   1,674,000,000        
Assets acquired   1,786,000,000        
Liabilities assumed   112,000,000        
Mazor Robotics | Technology-Based Intangible Assets            
Business Acquisition [Line Items]            
Intangible assets acquired   $ 383,000,000        
Estimated useful life   10 years        
Mazor Robotics | Tradenames            
Business Acquisition [Line Items]            
Intangible assets acquired   $ 16,000,000        
Estimated useful life   10 years        
EPiX Therapeutics, Inc.            
Business Acquisition [Line Items]            
Cash consideration $ 216,000,000          
Intangible assets acquired 162,000,000          
Goodwill 165,000,000          
Total consideration for the transaction, net of cash acquired 316,000,000          
Net assets acquired 319,000,000          
Assets acquired 334,000,000          
Liabilities assumed 15,000,000          
Contingent consideration 100,000,000          
EPiX Therapeutics, Inc. | IPR&D            
Business Acquisition [Line Items]            
Indefinite-lived intangible assets acquired $ 162,000,000          
Heartware International, Inc            
Business Acquisition [Line Items]            
Purchase accounting adjustments. increase to goodwill     $ 54,000,000