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Financial Instruments - Activity Related to the Company's Investment Portfolio and Available-for-sale Debt Securities Contractual Maturities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
AFS Debt Maturities        
Due in one year or less $ 2,245   $ 2,245  
Due after one year through five years 6,314   6,314  
Due after five years through ten years 3,197   3,197  
Due after ten years 285   285  
Total 12,041   12,041  
Debt [Member]        
AFS Gross Realized Gain (Loss)        
Proceeds from sales 1,481 $ 806 2,718 $ 2,636
Gross realized gains 4 4 9 16
Gross realized losses (7) (2) (12) (5)
Impairment losses recognized 0 0 0 0
Equity [Member]        
AFS Gross Realized Gain (Loss)        
Proceeds from sales 5 7 34 29
Gross realized gains 20 39 32 58
Gross realized losses 0 0 0 0
Impairment losses recognized (19) (20) (42) (20)
Equity [Member] | Other expense, net [Member]        
AFS Gross Realized Gain (Loss)        
Gross realized gains $ 9 $ 35 $ 9 $ 41