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Leases - Information related to lease payments and lease liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lease liabilities [abstract]      
Liabilities arising from financing activities, beginning balance $ 25,725 $ 28,564  
Lease interest 126 23 $ 26
Currency (101) (555)  
Other 4,988 15  
Liabilities arising from financing activities, ending balance 28,569 25,725 $ 28,564
Current leases, presented within current Finance debt 1,148 57  
Lease liabilities, presented within non-current Finance debt 3,191    
Lease liabilities [member]      
Lease liabilities [abstract]      
Liabilities arising from financing activities, beginning balance 4,660    
New leases, Including remeasurements and cancelations 861    
Gross lease payments (1,280)    
Lease interest 144    
Lease down-payments (1,136)    
Currency (47)    
Liabilities arising from financing activities, ending balance $ 4,339 $ 4,660