Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
Oct. 26, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 39,543
Goodwill as a result of acquisitions	60
Currency translation	(998)
Ending balance	38,605
Cardiac and Vascular Group
Goodwill [Roll Forward]
Beginning balance	6,791
Goodwill as a result of acquisitions	0
Currency translation	(82)
Ending balance	6,709
Minimally Invasive Therapies Group
Goodwill [Roll Forward]
Beginning balance	21,155
Goodwill as a result of acquisitions	20
Currency translation	(772)
Ending balance	20,403
Restorative Therapies Group
Goodwill [Roll Forward]
Beginning balance	9,717
Goodwill as a result of acquisitions	40
Currency translation	(143)
Ending balance	9,614
Diabetes Group
Goodwill [Roll Forward]
Beginning balance	1,880
Goodwill as a result of acquisitions	0
Currency translation	(1)
Ending balance	$ 1,879

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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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.

+ References

No definition available.

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