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Collaborations - Bayer HealthCare Pharmaceuticals Inc. (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) country	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues	$ 23,362	$ 23,747	$ 22,849
Collaborative Arrangement with Bayer [Member] | Nexavar [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of countries product is marketed and sold | country	100
Collaboration, royalty percentage in the high 30s	30.00%
Percentage of net profits after deducting certain partner related costs	50.00%
Collaborative Arrangement with Bayer [Member] | Nexavar [Member] | Other revenues [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration profit	$ 210	164	161
Collaborative Arrangement with Bayer [Member] | Royalty [Member] | Other revenues [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues	$ 79	$ 91	$ 133

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Number of Countries Product is Marketed and Sold

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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