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Accumulated Other Comprehensive (Loss) Income and Supplemental Equity Disclosure - Supplemental Equity Schedule (Details) - USD ($)
$ in Millions
 3 Months Ended
Jul. 28, 2017
Jul. 29, 2016
Apr. 28, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance $ 50,416    
Net income 1,009 $ 929  
Other comprehensive income 689 $ (156)  
Dividends to shareholders (625)    
Issuance of shares under stock purchase and award plans 138    
Repurchase of ordinary shares (1,228)    
Stock-based compensation 92    
Cumulative effect of change in accounting principle     $ 296
Balance 50,787    
Total Shareholders' Equity      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 50,294    
Net income 1,016    
Other comprehensive income 689    
Dividends to shareholders (625)    
Issuance of shares under stock purchase and award plans 138    
Repurchase of ordinary shares (1,228)    
Stock-based compensation 92    
Cumulative effect of change in accounting principle     $ 296
Balance 50,672    
Noncontrolling Interests      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance 122    
Net income (7)    
Other comprehensive income 0    
Balance $ 115