Income Taxes , Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at beginning of fiscal year	$ 1,727	$ 1,896	$ 2,703
Gross increases:
Prior year tax positions	34	13	147
Current year tax positions	109	63	75
Acquisitions	0	0	4
Gross decreases:
Prior year tax positions	(14)	(120)	(538)
Settlements	0	(80)	(467)
Statute of limitation lapses	(20)	(45)	(28)
Gross unrecognized tax benefits at end of fiscal year	1,836	1,727	1,896
Cash advance paid to taxing authorities	(859)	(859)	0
Gross unrecognized tax benefits at end of fiscal year, net of cash advance	$ 977	$ 868	$ 1,896

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Unrecognized Tax Benefits, Net of Cash Advance Paid

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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