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Leases - Information related to lease payments and lease liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lease liabilities [abstract]      
Liabilities arising from financing activities, beginning balance $ 28,569 $ 25,725  
Lease interest 104 126 $ 23
Foreign currency translation effects 1,064 (101)  
Liabilities arising from financing activities, ending balance 35,937 28,569 25,725
Current leases, presented within current Finance debt [1] 1,186 1,148  
Noncurrent Leases [1] 3,220 3,191  
Lease liabilities [member]      
Lease liabilities [abstract]      
Liabilities arising from financing activities, beginning balance 4,339 4,660  
New leases, Including remeasurements and cancelations 1,349 861  
Gross lease payments (1,415) (1,280)  
Lease interest 102 144  
Lease down-payments (1,312) (1,136)  
Foreign currency translation effects 31 (47)  
Liabilities arising from financing activities, ending balance $ 4,406 $ 4,339 $ 4,660
[1]
* Lease liabilities are separated from the line item Finance debt and 2019 is reclassified.