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Finance debt - Reconciliation of liabilities arising from financing activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 25,725 $ 28,564  
Transfer to current portion 0 0  
Effects of exchange rate changes (101) (555)  
Divdend declared 3,453 3,064  
Scrip dividends 0 (338)  
Cash Flows From Used In Financing Activities (5,497) (5,024) $ (5,822)
Other changes 4,988 15  
Liabilities arising from financing activities, ending balance 28,569 25,725 28,564
Non-current finance debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 23,264 24,183  
Transfer to current portion (3,152) (1,380)  
Effects of exchange rate changes (108) (556)  
Cash Flows From Used In Financing Activities 984 998  
Other changes 3,957 20  
Liabilities arising from financing activities, ending balance 24,945 23,264 24,183
Current finance debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 2,463 4,091  
Transfer to current portion 3,152 1,380  
Effects of exchange rate changes 0 2  
Cash Flows From Used In Financing Activities (2,585) (2,949)  
Other changes 1,057 (61)  
Liabilities arising from financing activities, ending balance 4,087 2,463 4,091
Financial receivable collaterals [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance (591) (272)  
Cash Flows From Used In Financing Activities (32) (331)  
Other changes (11) 11  
Liabilities arising from financing activities, ending balance (634) (591) (272)
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 (196) (191)  
Cash Flows From Used In Financing Activities (514) (64)  
Other changes 2 59  
Liabilities arising from financing activities, ending balance (708) (196) (191)
Non-controling interest [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 19 24  
Cash Flows From Used In Financing Activities (7) (7)  
Other changes 8 2  
Liabilities arising from financing activities, ending balance 20 19 24
Dividend payable [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 766 729  
Effects of exchange rate changes 7 (1)  
Divdend declared 3,453 3,064  
Scrip dividends 0 (338)  
Cash Flows From Used In Financing Activities (3,342) (2,672)  
Other changes (25) (16)  
Liabilities arising from financing activities, ending balance $ 859 $ 766 $ 729