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Goodwill and Other Intangible Assets, Net - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
Apr. 24, 2015
Goodwill and Intangible Assets Disclosure [Abstract]          
Purchase accounting adjustments, net     $ 20,000,000    
Amortization expense $ 483,000,000 $ 89,000,000 964,000,000 $ 176,000,000  
Carrying amount of goodwill 41,274,000,000   41,274,000,000   $ 40,530,000,000
Goodwill impairment 0 0 0 0  
Carrying amount of amortizable intangible assets 26,962,000,000   26,962,000,000   27,381,000,000
Impairment of amortizable intangible assets 0 0 0 0  
Indefinite-lived Intangible Assets [Line Items]          
Carrying amount of non-amortizable intangible assets 769,000,000   769,000,000   720,000,000
IPR&D [Member]          
Indefinite-lived Intangible Assets [Line Items]          
Carrying amount of non-amortizable intangible assets 769,000,000   769,000,000   $ 470,000,000
Impairment of non-amortizable intangible assets $ 0 $ 0 $ 0 $ 0