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Employee benefits - Reclassification from cash-settled to equity-settled (Details) - USD ($)
$ in Millions
 1 Months Ended 8 Months Ended 12 Months Ended
May 01, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]            
Financial liabilities at beginning of period       $ 57,186    
Financial liabilities at end of period     $ 54,136 54,136 $ 57,186  
Balance at beginning of year       34,821 38,993 $ 44,832
Balance at end of year     35,306 35,306 34,821 38,993
Net income       22,445 $ 4,881 $ (1,683)
Matching Program            
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]            
Financial liabilities at beginning of period $ 33   33      
Liability, Remeasurement   $ 5        
Liability, Reclassification   (38)        
Financial liabilities at end of period   33        
Stockholders' equity, Reclassification   38        
Stockholders' equity, Expense     19      
Balance at end of year 38   57 57    
Net income, Remeasurement   (5)        
Net income, Expense     (19)      
Net income (5)   (24)      
Performance Share Unit Program - PSU            
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]            
Financial liabilities at beginning of period 3   3      
Liability, Remeasurement   (1)        
Liability, Reclassification   (2)        
Financial liabilities at end of period   3        
Stockholders' equity, Reclassification   2        
Stockholders' equity, Expense     4      
Balance at end of year 2   6 $ 6    
Net income, Remeasurement   $ 1        
Net income, Expense     (4)      
Net income $ 1   $ (3)