Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 24, 2020	Apr. 26, 2019	Apr. 27, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at beginning of fiscal year	$ 1,836	$ 1,727	$ 1,896
Gross increases:
Prior year tax positions	12	34	13
Current year tax positions	55	109	63
Gross decreases:
Prior year tax positions	(9)	(14)	(120)
Settlements	(5)	0	(80)
Statute of limitation lapses	(27)	(20)	(45)
Gross unrecognized tax benefits at end of fiscal year	1,862	1,836	1,727
Cash advance paid to taxing authorities	(859)	(859)	(859)
Gross unrecognized tax benefits at end of fiscal year, net of cash advance	$ 1,003	$ 977	$ 868