Revenue - Disaggregation of Net Sales by Segment and Division (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2020	Oct. 25, 2019	Oct. 30, 2020	Oct. 25, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 7,647	$ 7,706	$ 14,154	$ 15,199
Cardiac & Vascular Group
Disaggregation of Revenue [Line Items]
Net sales	2,725	2,855	5,158	5,645
Cardiac & Vascular Group | Cardiac Rhythm & Heart Failure
Disaggregation of Revenue [Line Items]
Net sales	1,426	1,426	2,673	2,807
Cardiac & Vascular Group | Coronary & Structural Heart
Disaggregation of Revenue [Line Items]
Net sales	831	955	1,611	1,896
Cardiac & Vascular Group | Aortic, Peripheral, & Venous
Disaggregation of Revenue [Line Items]
Net sales	468	474	873	942
Minimally Invasive Therapies Group
Disaggregation of Revenue [Line Items]
Net sales	2,285	2,142	4,086	4,242
Minimally Invasive Therapies Group | Surgical Innovations
Disaggregation of Revenue [Line Items]
Net sales	1,393	1,454	2,473	2,871
Minimally Invasive Therapies Group | Respiratory, Gastrointestinal, & Renal
Disaggregation of Revenue [Line Items]
Net sales	893	688	1,613	1,371
Restorative Therapies Group
Disaggregation of Revenue [Line Items]
Net sales	2,063	2,112	3,774	4,124
Restorative Therapies Group | Cranial & Spinal Technologies
Disaggregation of Revenue [Line Items]
Net sales	1,071	1,117	2,015	2,167
Restorative Therapies Group | Specialty Therapies
Disaggregation of Revenue [Line Items]
Net sales	581	575	1,035	1,138
Restorative Therapies Group | Neuromodulation
Disaggregation of Revenue [Line Items]
Net sales	411	420	725	818
Diabetes Group
Disaggregation of Revenue [Line Items]
Net sales	$ 574	$ 596	$ 1,136	$ 1,188