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Finance debt - Reconciliation of cash flow from financing activities to finance line items in balance sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 28,569 $ 25,725  
Transfer to current portion 0 0  
Effects of exchange rate changes 1,064 (101)  
Divdend declared 1,833 3,453  
Cash flows provided by/(used in) financing activities 2,991 (5,496) $ (5,024)
Other changes 1,480 4,988  
Liabilities arising from financing activities, ending balance 35,937 28,569 25,725
Non-current finance debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 21,754 22,889  
Transfer to current portion (1,974) (1,322)  
Effects of exchange rate changes 1,049 (108)  
Cash flows provided by/(used in) financing activities 8,347 984  
Other changes (58) (689)  
Liabilities arising from financing activities, ending balance 29,118 21,754 22,889
Current finance debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 2,939 2,406  
Transfer to current portion 1,974 1,322  
Effects of exchange rate changes 0 0  
Cash flows provided by/(used in) financing activities (346) (1,487)  
Other changes 24 698  
Liabilities arising from financing activities, ending balance 4,591 2,939 2,406
Financial receivable collaterals [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance (634) (591)  
Cash flows provided by/(used in) financing activities (329) (32)  
Other changes (4) (11)  
Liabilities arising from financing activities, ending balance (967) (634) (591)
Additional paid in capital share based payment/treasury shares [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance (708) (196)  
Cash flows provided by/(used in) financing activities (1,059) (514)  
Other changes 179 2  
Liabilities arising from financing activities, ending balance (1,588) (708) (196)
Non-controling interest [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 20 19  
Cash flows provided by/(used in) financing activities (16) (7)  
Other changes 15 8  
Liabilities arising from financing activities, ending balance 19 20 19
Dividend payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 859 766  
Effects of exchange rate changes 15 7  
Divdend declared 1,833 3,453  
Cash flows provided by/(used in) financing activities (2,330) (3,342)  
Other changes (20) (25)  
Liabilities arising from financing activities, ending balance 357 859 766
Total excluding Lease liabilities [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 24,230 25,293  
Transfer to current portion 0 0  
Effects of exchange rate changes 1,064 (101)  
Divdend declared 1,833 3,453  
Cash flows provided by/(used in) financing activities 4,268 (4,398)  
Other changes 136 (17)  
Liabilities arising from financing activities, ending balance 31,531 24,230 25,293
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 4,339 4,660  
Effects of exchange rate changes 31 (47)  
Cash flows provided by/(used in) financing activities (1,277) (1,098)  
Other changes 1,344 5,005  
Liabilities arising from financing activities, ending balance $ 4,406 4,339 4,660
Lease liabilities [member] | Previously stated [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance   $ 432  
Liabilities arising from financing activities, ending balance     $ 432