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Income taxes - Changes in Deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in net deferred tax liability during the year [abstract]      
Net deferred tax liability beginning balance $ 6,250 $ 5,530 $ 5,367
Charged (credited) to the Consolidated statement of income 1,708 435 (381)
Charged (credited) to Other comprehensive income 35 (19) 98
Foreign currency translation effects and other effects (337) 304 446
Net deferred tax liability ending balance 7,655 6,250 5,530
Net deferred tax assets and liabilities [abstract]      
Deferred tax assets 6,259 4,974 3,881
Deferred tax liabilities 14,037 11,224 $ 9,410
Deferred tax assets recognized in entities which have suffered a loss in either the current or preceding period 4,636 2,328  
Deferred tax assets 6,381    
Deferred tax assets reported in Assets classified as held for sale $ 122 $ 0