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Guarantor Financial Information , Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Apr. 26, 2013
Statement of Financial Position [Abstract]        
Investment in subsidiaries $ 0 $ 0    
Shareholders’ equity 52,063 53,230 $ 19,443 $ 18,671
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable 0 0 0  
Net intercompany loan borrowings (repayments) 0 0 0  
Net cash provided by (used in) investing activities 2,245 (17,058) (3,594)  
Net cash provided by (used in) financing activities (9,543) 15,949 (918)  
Net cash provided by (used in) operating activities 5,218 4,902 $ 4,959  
Capital contributions paid 0 0    
Capital contributions received 0 0    
Subsidiary Issuer [Member] | CIFSA Notes [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries 41,582 28,663    
Shareholders’ equity 31,948 22,784    
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable (8,193) (59)    
Net intercompany loan borrowings (repayments) 6,306 97    
Net cash provided by (used in) investing activities (8,913) (556)    
Net cash provided by (used in) financing activities 4,185 46    
Net cash provided by (used in) operating activities 4,208 1,238    
Capital contributions paid (720) (937)    
Capital contributions received 0 0    
Subsidiary Issuer [Member] | CIFSA Notes [Member] | Restatement Adjustment [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries   14,700    
Shareholders’ equity   14,700    
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable   8,000    
Net intercompany loan borrowings (repayments)   (8,000)    
Net cash provided by (used in) operating activities   937    
Capital contributions paid   (937)    
Subsidiary Guarantors [Member] | CIFSA Notes [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries 68,875 61,768    
Shareholders’ equity 66,104 63,233    
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable (164) 29    
Net intercompany loan borrowings (repayments) 4,296 0    
Net cash provided by (used in) investing activities (5,070) 28    
Net cash provided by (used in) financing activities 4,296 0    
Net cash provided by (used in) operating activities 604 142    
Capital contributions paid (4,959) 0    
Capital contributions received 0 0    
Subsidiary Guarantors [Member] | CIFSA Notes [Member] | Restatement Adjustment [Member]        
Statement of Cash Flows [Abstract]        
Net cash provided by (used in) investing activities   1,300    
Net cash provided by (used in) operating activities   (1,300)    
Subsidiary Non-guarantors [Member] | CIFSA Notes [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries 0 0    
Shareholders’ equity 85,513 74,647    
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable (3,302) (10,626)    
Net intercompany loan borrowings (repayments) (2,861) 59    
Net cash provided by (used in) investing activities (1,110) (18,423)    
Net cash provided by (used in) financing activities (4,131) 16,459    
Net cash provided by (used in) operating activities 4,114 4,596    
Capital contributions paid 0 0    
Capital contributions received $ 5,679 937    
Subsidiary Non-guarantors [Member] | CIFSA Notes [Member] | Restatement Adjustment [Member]        
Statement of Cash Flows [Abstract]        
Net (increase) decrease in intercompany loans receivable   8,000    
Net intercompany loan borrowings (repayments)   (8,000)    
Net cash provided by (used in) operating activities   (937)    
Capital contributions received   $ 937