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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 27, 2018
Jul. 28, 2017
Apr. 27, 2018
Investments [Abstract]      
Credit loss portion of other-than-temporary impairments $ 0   $ 0
Reductions for available-for-sale securities sold 0 $ 0  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of change in accounting principle     296
Equity Investments      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net gains recognized 98    
Net realized gains on equity and other investments sold during the period 45    
Net unrealized gains on equity and other investments still held $ 53    
Accumulated Other Comprehensive Loss      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of change in accounting principle     47
Accumulated Other Comprehensive Loss | Accounting Standards Update 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of change in accounting principle     47
Retained Earnings | Accounting Standards Update 2016-01      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of change in accounting principle     $ (47)