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Goodwill and Other Intangible Assets , Changes in Goodwill (Details) - USD ($)
 12 Months Ended
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Goodwill [Roll Forward]      
Goodwill, beginning balance $ 41,500,000,000 $ 40,530,000,000  
Other adjustments, net   (31,000,000)  
Currency adjustment, net (807,000,000) (248,000,000)  
Goodwill reclassified to noncurrent assets held for sale (2,910,000,000)    
Goodwill, ending balance 38,515,000,000 41,500,000,000 $ 40,530,000,000
Goodwill impairment 0 0 0
Cardiac and Vascular Group      
Goodwill [Roll Forward]      
Goodwill, beginning balance 6,243,000,000 5,855,000,000  
Other adjustments, net   0  
Currency adjustment, net (49,000,000) (26,000,000)  
Goodwill reclassified to noncurrent assets held for sale 0    
Goodwill, ending balance 6,651,000,000 6,243,000,000 5,855,000,000
Minimally Invasive Therapies Group      
Goodwill [Roll Forward]      
Goodwill, beginning balance 23,784,000,000 23,399,000,000  
Other adjustments, net   (34,000,000)  
Currency adjustment, net (705,000,000) (191,000,000)  
Goodwill reclassified to noncurrent assets held for sale (2,910,000,000)    
Goodwill, ending balance 20,411,000,000 23,784,000,000 23,399,000,000
Restorative Therapies Group      
Goodwill [Roll Forward]      
Goodwill, beginning balance 9,620,000,000 9,424,000,000  
Other adjustments, net   3,000,000  
Currency adjustment, net (53,000,000) (32,000,000)  
Goodwill reclassified to noncurrent assets held for sale 0    
Goodwill, ending balance 9,600,000,000 9,620,000,000 9,424,000,000
Diabetes Group      
Goodwill [Roll Forward]      
Goodwill, beginning balance 1,853,000,000 1,852,000,000  
Other adjustments, net   0  
Currency adjustment, net 0 1,000,000  
Goodwill reclassified to noncurrent assets held for sale 0    
Goodwill, ending balance 1,853,000,000 1,853,000,000 $ 1,852,000,000
Other acquisitions      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions 732,000,000 856,000,000  
Other acquisitions | Cardiac and Vascular Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions 457,000,000 393,000,000  
Other acquisitions | Minimally Invasive Therapies Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions 242,000,000 264,000,000  
Other acquisitions | Restorative Therapies Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions 33,000,000 199,000,000  
Other acquisitions | Diabetes Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions $ 0 0  
Covidien plc      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions   393,000,000  
Covidien plc | Cardiac and Vascular Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions   21,000,000  
Covidien plc | Minimally Invasive Therapies Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions   346,000,000  
Covidien plc | Restorative Therapies Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions   26,000,000  
Covidien plc | Diabetes Group      
Goodwill [Roll Forward]      
Goodwill as a result of acquisitions   $ 0