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Collaborations - Bayer HealthCare Pharmaceuticals Inc. (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) country	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues	$ 25,424	$ 23,362	$ 23,747
US [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues	$ 18,496	17,224	18,358
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
Collaborative Arrangement with Bayer [Member] | Nexavar [Member] | US [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration, royalty percentage	30.00%
Collaborative Arrangement with Bayer [Member] | Nexavar [Member] | NonUs,ExcludingJapan [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration, royalty percentage	30.00%
Collaborative Arrangement with Bayer [Member] | Nexavar [Member] | Other revenues [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration profit		210	164
Collaborative Arrangement with Bayer [Member] | Royalty [Member] | Other revenues [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues	$ 217	$ 79	$ 91

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