Marketable Securities - Unrealized Losses (Details) $ in Millions	Apr. 28, 2019 USD ($)
Estimated Fair Value
Less than 12 Months	$ 1,759
12 Months or Greater	891
Total	2,650
Gross Unrealized Losses
Less than 12 Months	(1)
12 Months or Greater	(3)
Total	(4)
Debt securities of United States government agencies
Estimated Fair Value
Less than 12 Months	1,429
12 Months or Greater	306
Total	1,735
Gross Unrealized Losses
Less than 12 Months	0
12 Months or Greater	(1)
Total	(1)
Corporate debt securities
Estimated Fair Value
Less than 12 Months	330
12 Months or Greater	453
Total	783
Gross Unrealized Losses
Less than 12 Months	(1)
12 Months or Greater	(1)
Total	(2)
Asset-backed securities
Estimated Fair Value
Less than 12 Months	0
12 Months or Greater	132
Total	132
Gross Unrealized Losses
Less than 12 Months	0
12 Months or Greater	(1)
Total	$ (1)