Goodwill And Other Intangible Assets (Goodwill by Segment) (Details) - USD ($) $ in Millions	Apr. 02, 2021	Dec. 31, 2020
Goodwill [Line Items]
Total goodwill	$ 34,880	$ 35,420
Operating segments \| Life Sciences
Goodwill [Line Items]
Total goodwill	25,346	25,812
Operating segments \| Diagnostics
Goodwill [Line Items]
Total goodwill	7,013	7,082
Operating segments \| Environmental & Applied Solutions
Goodwill [Line Items]
Total goodwill	$ 2,521	$ 2,526

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: 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=120320667&loc=SL49117168-202975

Reference 3: 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant