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Financial Instruments - Investments by Category and Related Balance Sheet Classification, Equity and Other Investments (Details)
$ in Millions
Apr. 27, 2018
USD ($)
Equity Investments  
Available-for-sale securities:  
Cost $ 1,001
Unrealized Gains 99
Unrealized Losses (156)
Fair Value 944
Total equity and other investments  
Cost 1,354
Unrealized Gains 99
Unrealized Losses (156)
Fair Value 944
Equity Investments | Level 3  
Cost method, equity method, and other investments:  
Cost 353
Marketable equity securities | Level 1  
Available-for-sale securities:  
Cost 63
Unrealized Gains 99
Unrealized Losses 0
Fair Value 162
Debt funds | Level 2  
Available-for-sale securities:  
Cost 739
Unrealized Gains 0
Unrealized Losses (154)
Fair Value 585
Debt funds | Investments measured at net asset value  
Available-for-sale securities:  
Cost 199
Unrealized Gains 0
Unrealized Losses (2)
Fair Value 197
Investments | Equity Investments  
Available-for-sale securities:  
Fair Value 782
Total equity and other investments  
Fair Value 782
Investments | Equity Investments | Level 3  
Cost method, equity method, and other investments:  
Cost 0
Investments | Marketable equity securities | Level 1  
Available-for-sale securities:  
Fair Value 0
Investments | Debt funds | Level 2  
Available-for-sale securities:  
Fair Value 585
Investments | Debt funds | Investments measured at net asset value  
Available-for-sale securities:  
Fair Value 197
Other Assets | Equity Investments  
Available-for-sale securities:  
Fair Value 162
Total equity and other investments  
Fair Value 515
Other Assets | Equity Investments | Level 3  
Cost method, equity method, and other investments:  
Cost 353
Other Assets | Marketable equity securities | Level 1  
Available-for-sale securities:  
Fair Value 162
Other Assets | Debt funds | Level 2  
Available-for-sale securities:  
Fair Value 0
Other Assets | Debt funds | Investments measured at net asset value  
Available-for-sale securities:  
Fair Value $ 0