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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 28, 2017	Jul. 29, 2016	Apr. 28, 2017
Income Tax Contingency [Line Items]
Effective tax rate	15.60%	6.00%
Certain tax adjustments, restructuring	$ 60
Certain tax adjustments, settlements and other		$ (31)
Charge, redemption of an intercompany minority interest		29
Gross unrecognized tax benefits	1,800		$ 1,900
Accrued gross interest and penalties	384
Unrecognized tax benefits that would impact effective tax rate	1,800
Accrued income taxes
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits	$ 92
Ardian, CoreValve and Ablation
Income Tax Contingency [Line Items]
Charge (benefit), settlements		371
Subsidiaries
Income Tax Contingency [Line Items]
Charge (benefit), settlements		$ (431)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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