Segment and Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jan. 24, 2020	Jan. 25, 2019	Jan. 24, 2020	Jan. 25, 2019
Segment Reporting Information [Line Items]
Net sales	$ 7,717	$ 7,546	$ 22,916	$ 22,411
Income before Income Taxes by Reportable Segment
Segment operating profit	1,639	1,542	4,475	4,322
Interest expense	(156)	(243)	(930)	(726)
Amortization of intangible assets	(436)	(436)	(1,317)	(1,327)
Restructuring and associated costs	(13)	(26)	(87)	(112)
Certain litigation charges	(108)	(63)	(276)	(166)
Income (loss) before income taxes	1,579	1,370	3,850	3,905
Ireland
Segment Reporting Information [Line Items]
Net sales	22	24	66	68
United States
Segment Reporting Information [Line Items]
Net sales	4,021	4,001	12,068	11,910
Rest of world
Segment Reporting Information [Line Items]
Net sales	3,674	3,521	10,782	10,433
Total other countries, excluding Ireland
Segment Reporting Information [Line Items]
Net sales	7,695	7,522	22,850	22,343
Operating Segments
Income before Income Taxes by Reportable Segment
Segment operating profit	3,017	2,918	8,724	8,590
Segment Reconciling Items
Income before Income Taxes by Reportable Segment
Interest expense	(156)	(243)	(930)	(726)
Other non-operating income, net	96	71	305	309
Amortization of intangible assets	(436)	(436)	(1,317)	(1,327)
Corporate	(348)	(331)	(1,005)	(974)
Centralized distribution costs	(348)	(383)	(1,117)	(1,313)
Restructuring and associated costs	(97)	(66)	(315)	(256)
Acquisition-related items	(28)	(17)	(74)	(57)
Certain litigation charges	(108)	(63)	(276)	(166)
IPR&D charges	0	(11)	0	(26)
Exit of businesses	0	(69)	(41)	(149)
Debt tender premium and other charges	0	0	7	0
Medical device regulations	(13)	0	(31)	0
Contribution to Medtronic Foundation	0	0	(80)	0
Cardiac and Vascular Group
Segment Reporting Information [Line Items]
Net sales	2,819	2,786	8,464	8,455
Cardiac and Vascular Group \| United States
Segment Reporting Information [Line Items]
Net sales	1,366	1,369	4,182	4,240
Cardiac and Vascular Group \| Operating Segments
Income before Income Taxes by Reportable Segment
Segment operating profit	1,101	1,076	3,284	3,262
Minimally Invasive Therapies Group
Segment Reporting Information [Line Items]
Net sales	2,176	2,124	6,418	6,223
Minimally Invasive Therapies Group \| United States
Segment Reporting Information [Line Items]
Net sales	934	930	2,769	2,659
Minimally Invasive Therapies Group \| Operating Segments
Income before Income Taxes by Reportable Segment
Segment operating profit	860	828	2,453	2,396
Restorative Therapies Group
Segment Reporting Information [Line Items]
Net sales	2,111	2,026	6,235	5,968
Restorative Therapies Group \| United States
Segment Reporting Information [Line Items]
Net sales	1,409	1,354	4,187	4,005
Restorative Therapies Group \| Operating Segments
Income before Income Taxes by Reportable Segment
Segment operating profit	898	824	2,531	2,394
Diabetes Group
Segment Reporting Information [Line Items]
Net sales	610	610	1,798	1,765
Diabetes Group \| United States
Segment Reporting Information [Line Items]
Net sales	312	348	930	1,006
Diabetes Group \| Operating Segments
Income before Income Taxes by Reportable Segment
Segment operating profit	$ 158	$ 190	$ 456	$ 538

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