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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  
Total available-for-sale equity 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
Equity Investments | Investments  
Total available-for-sale equity securities  
Fair Value 782
Total equity and other investments  
Fair Value 782
Equity Investments | Investments | Level 3  
Cost method, equity method, and other investments:  
Cost 0
Equity Investments | Other assets  
Total available-for-sale equity securities  
Fair Value 162
Total equity and other investments  
Fair Value 515
Equity Investments | Other assets | Level 3  
Cost method, equity method, and other investments:  
Cost 353
Marketable equity securities | Level 1  
Total available-for-sale equity securities  
Cost 63
Unrealized Gains 99
Unrealized Losses 0
Fair Value 162
Marketable equity securities | Investments | Level 1  
Total available-for-sale equity securities  
Fair Value 0
Marketable equity securities | Other assets | Level 1  
Total available-for-sale equity securities  
Fair Value 162
Debt funds | Level 2  
Total available-for-sale equity securities  
Cost 739
Unrealized Gains 0
Unrealized Losses (154)
Fair Value 585
Debt funds | Investments measured at net asset value  
Total available-for-sale equity securities  
Cost 199
Unrealized Gains 0
Unrealized Losses (2)
Fair Value 197
Debt funds | Investments | Level 2  
Total available-for-sale equity securities  
Fair Value 585
Debt funds | Investments | Investments measured at net asset value  
Total available-for-sale equity securities  
Fair Value 197
Debt funds | Other assets | Level 2  
Total available-for-sale equity securities  
Fair Value 0
Debt funds | Other assets | Investments measured at net asset value  
Total available-for-sale equity securities  
Fair Value $ 0