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Acquisitions and Acquisition-Related Items - Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent Consideration, Fair Value $ 291 $ 87 $ 264 $ 68
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions [Roll Forward]        
Beginning Balance 291 87 264 68
Purchase price contingent consideration 109 0 135 23
Contingent consideration payments (17) 0 (20) (5)
Change in fair value of contingent consideration (15) 4 (11) 5
Ending Balance 368 $ 91 368 $ 91
Revenue-based payments [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent Consideration, Fair Value 203   203  
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions [Roll Forward]        
Ending Balance 203   $ 203  
Revenue-based payments [Member] | Minimum [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs        
Discount rate     11.00%  
Probability of payment     30.00%  
Revenue-based payments [Member] | Maximum [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs        
Discount rate     27.20%  
Probability of payment     100.00%  
Product development-based payments [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent Consideration, Fair Value 165   $ 165  
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions [Roll Forward]        
Ending Balance $ 165   $ 165  
Product development-based payments [Member] | Minimum [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs        
Discount rate     0.60%  
Probability of payment     15.00%  
Product development-based payments [Member] | Maximum [Member] | Recurring [Member] | Level 3 [Member] | Discounted cash flow [Member]        
Fair Value Inputs        
Discount rate     5.50%  
Probability of payment     100.00%