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Stockholders' equity - Others reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Others reserves      
Other comprehensive income $ (5,492) $ (848) $ (3,399)
Translation adjustment 4,203 1,111 3,899
Acquisitions and disposal of noncontrolling interest 242 (1,007) (229)
Other reserves      
Others reserves      
Balance at beginning of year (2,110) (2,155)  
Other comprehensive income 13 (310)  
Translation adjustment 254 12  
Acquisitions and disposal of noncontrolling interest (213) 343  
Balance at end of year (2,056) (2,110) (2,155)
Retirement benefit obligations      
Others reserves      
Balance at beginning of year (869) (755)  
Other comprehensive income (88) (126)  
Translation adjustment 92 12  
Balance at end of year (865) (869) (755)
Fair value adjustment to Investment in equity securities      
Others reserves      
Balance at beginning of year (124) 60  
Other comprehensive income 101 (184)  
Translation adjustment 162    
Balance at end of year 139 (124) 60
Results on conversion of shares      
Others reserves      
Balance at beginning of year (490) (490)  
Balance at end of year (490) (490) (490)
Net ownership changes in subsidiaries      
Others reserves      
Balance at beginning of year (627) (970)  
Acquisitions and disposal of noncontrolling interest (213) 343  
Balance at end of year $ (840) $ (627) $ (970)