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Acquisitions of businesses (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [line items]      
Property, plant and equipment $ 26 $ 44 $ 137
Right-of-use assets 32    
Currently marketed products 196 3,550 2,531
Acquired research and development 8,600 342 10,224
Other intangible assets 218 22 1
Deferred tax assets 476 60 381
Non-current financial and other assets 49 8 19
Inventories 84 195 20
Trade receivables and financial and other current assets 109 4 90
Cash and cash equivalents 76   1,112
Deferred tax liabilities (1,977) (107) (2,874)
Current and non-current financial debts (32) (2) (14)
Current and non-current lease liabilities (44)    
Trade payables and other liabilities (144) (178) (627)
Net identifiable assets acquired 7,669 3,938 11,000
Acquired cash and cash equivalents (76)   (1,112)
Non-controlling interests     (26)
Goodwill 2,580 186 4,084
Net assets recognized as a result of acquisitions of business 10,173 4,124 13,946
Goodwill expected to be deductible for tax purposes $ 74 $ 98 $ 0