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Fair value measurement (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Length of time hedged in foreign currency contracts (or less) 3 years  
Long-term debt, fair value $ 37,900 $ 39,400
Carrying value of debt $ 32,782 $ 32,986