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Summary of changes in lease liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
DisclosureLeaseliabilitiesLineItems [Line Items]      
Beginning balance $ 23,043 $ 21,650  
Remeasurement of new contracts 1,510 801  
Cash outflow for leases (2,681)   $ (2,899)
Interest expense on lease liabilities 643 600  
Foreign exchange gains and losses (1,329) (682)  
Cumulative translation adjustment 1,377 724  
Transfers (36) (14)  
Ending balance 22,527 20,180  
BRAZIL      
DisclosureLeaseliabilitiesLineItems [Line Items]      
Beginning balance 4,604 4,340  
Remeasurement of new contracts 962 324  
Cash outflow for leases (784) (753)  
Interest expense on lease liabilities 162 108  
Foreign exchange gains and losses (152) (98)  
Cumulative translation adjustment 262 148  
Transfers   3  
Ending balance 5,054 4,072  
Foreign countries [member]      
DisclosureLeaseliabilitiesLineItems [Line Items]      
Beginning balance 18,439 17,310  
Remeasurement of new contracts 548 477  
Cash outflow for leases (1,897) (2,146)  
Interest expense on lease liabilities 481 492  
Foreign exchange gains and losses (1,177) (584)  
Cumulative translation adjustment 1,115 576  
Transfers (36) (17)  
Ending balance $ 17,473 $ 16,108