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Goodwill and other intangible assets (Identifiable Intangible Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts $ 32,021 $ 32,018
Accumulated amortization (16,743) (15,461)
Other intangible assets, net 15,278 16,557
Gross carrying amount 32,051 32,048
Accumulated amortization (16,743) (15,461)
Intangible assets, net 15,308 16,587
In-process Research and Development [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 30 30
Developed-Product-Technology Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts 25,584 25,591
Accumulated amortization (11,673) (10,564)
Other intangible assets, net 13,911 15,027
Licensing Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts 3,766 3,743
Accumulated amortization (2,886) (2,791)
Other intangible assets, net 880 952
Marketing-Related Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts 1,363 1,367
Accumulated amortization (1,079) (1,041)
Other intangible assets, net 284 326
Research and Development Technology Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amounts 1,308 1,317
Accumulated amortization (1,105) (1,065)
Other intangible assets, net $ 203 $ 252