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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended
Jul. 26, 2019
Apr. 26, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other-than-temporary impairment recognized on investments $ 0  
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure 1,569,000,000 $ 1,553,000,000
Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Proceeds from sale of available-for-sale investments 1,000,000,000.0  
Corporate Bonds | Other Income, Net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Realized gain on sale of available-for-sale investments $ 14,000,000