Financial Instruments - Activity Related to the Company's Investment Portfolio, Equity and Other Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Oct. 25, 2019
Marketable Securities [Line Items]
Proceeds from sales			$ 4,337,000,000	$ 3,260,000,000
Impairment losses recognized	$ 0
Equity and Other Investments
Marketable Securities [Line Items]
Proceeds from sales	2,000,000	$ 0	2,000,000	2,000,000
Gross gains	2,000,000	14,000,000	14,000,000	14,000,000
Gross losses	(2,000,000)	0	(2,000,000)	0
Impairment losses recognized	$ 0	$ (2,000,000)	$ (2,000,000)	$ (3,000,000)