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Acquisitions and Acquisition-Related Items - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 23, 2016
Aug. 05, 2016
Jan. 27, 2017
Jan. 29, 2016
Jan. 27, 2017
Jan. 29, 2016
Oct. 28, 2016
Aug. 31, 2016
Apr. 29, 2016
Oct. 30, 2015
Apr. 24, 2015
Business Acquisition [Line Items]                      
Goodwill     $ 41,224   $ 41,224       $ 41,500    
Acquisition-related items     68 $ 63 148 $ 183          
Fair value of contingent consideration     262 $ 371 262 $ 371 $ 285   377 $ 368 $ 264
Other liabilities [Member]                      
Business Acquisition [Line Items]                      
Fair value of contingent consideration     200   200       311    
Other accrued expenses [Member]                      
Business Acquisition [Line Items]                      
Fair value of contingent consideration     62   62       66    
Bank borrowings [Member]                      
Business Acquisition [Line Items]                      
Long-term debt     142   142       $ 56    
Heartware International, Inc. [Member]                      
Business Acquisition [Line Items]                      
Acquisition consideration $ 1,100                    
Other intangible assets 625                    
Goodwill 479                    
Long-term debt 245                    
Debt redeemed               $ 203      
Heartware International, Inc. [Member] | Bank borrowings [Member] | Debt due December 2017 [Member]                      
Business Acquisition [Line Items]                      
Long-term debt     $ 42   $ 42            
Heartware International, Inc. [Member] | Customer-related and technology-related [Member]                      
Business Acquisition [Line Items]                      
Other intangible assets $ 602                    
Estimated useful lives 15 years                    
Heartware International, Inc. [Member] | Tradenames [Member]                      
Business Acquisition [Line Items]                      
Other intangible assets $ 23                    
Estimated useful lives 5 years                    
Smith & Nephew's Gynecology Business [Member]                      
Business Acquisition [Line Items]                      
Acquisition consideration   $ 350                  
Other intangible assets   $ 167                  
Estimated useful lives   13 years                  
Goodwill   $ 180                  
Long-term debt   $ 0