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Collaborations - Novartis AG (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Revenues $ 25,424 $ 23,362 $ 23,747
Collaborative Arrangement with Novartis AG [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Potential future milestone payment 100    
Collaborative Arrangement with Novartis AG [Member] | Other revenues [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Revenues     295
Collaborative Arrangement with Novartis AG [Member] | Selling, general and administrative [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Cost paid     44
Cost recoveries 192 187  
Collaborative Arrangement with Novartis AG [Member] | Cost of sales [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Royalties due $ 139 $ 115 $ 43