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Financial items (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance Income Expense [Abstract]      
Foreign exchange gains (losses) derivative financial instruments $ (1,288) $ 132 $ 149
Other foreign exchange gains (losses) 642 92 (315)
Net foreign exchange gains (losses) (646) 224 (166)
Dividends received 44 75 150
Gains (losses) financial investments 473 245 (72)
Interest income on other financial assets 108 124 45
Interest income non-current financial receivables 34 21 27
Interest income current financial assets and other financial items 95 280 132
Interest income and other financial items 754 746 283
Gains (losses) derivative financial instruments 448 473 (341)
Interest expense bonds and bank loans and net interest on related derivatives (951) (987) (922)
Interest expense lease liabilities (104) (126) (23)
Capitalised borrowing costs 308 480 552
Accretion expense asset retirement obligations (412) (456) (461)
Interest expense current financial liabilities and other finance expense (232) (360) (185)
Interest and other finance expenses (1,392) (1,450) (1,040)
Net financial items (836) (7) (1,263)
Interest expense from the financial liabilities at amortised cost category 1,031 861 868
Net interest expense, fair value through profit or loss category   129 55
Net interest income, fair value through profit or loss category 79    
Fair value gain (loss) from the trading instruments held 432 457 (357)
Net foreign exchange gain $ 796    
Net foreign exchange loss   $ 74 $ 422