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Financial items (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance Income Expense [Abstract]      
Foreign exchange gains (losses) derivative financial instruments $ 132 $ 149 $ (920)
Other foreign exchange gains (losses) 92 (315) 1,046
Net foreign exchange gains (losses) 224 (166) 126
Dividends received 75 150 63
Gains (losses) financial investments 245 (72) 108
Interest income on other financial assets 124 45 64
Interest income non-current financial receivables 21 27 24
Interest income current financial assets and other financial items 280 132 228
Interest income and other financial items 746 283 487
Gains (losses) derivative financial instruments 473 (341) (61)
Interest expense bonds and bank loans and net interest on related derivatives (987) (922) (1,004)
Interest expense lease liabilities (126) (23) (26)
Capitalised borrowing costs 480 552 454
Accretion expense asset retirement obligations (456) (461) (413)
Interest expense current financial liabilities and other finance expense (360) (185) 86
Interest and other finance expenses (1,450) (1,040) (903)
Net financial items (7) (1,263) (351)
Interest expense from the financial liabilities at amortised cost category 861 868 1,084
Net interest expense, fair value through profit or loss category 129 55  
Net interest income, fair value through profit or loss category     80
Income from release of a provision     319
Fair value gain (loss) from the trading instruments held 457 (357) (77)
Net foreign exchange gain     $ 427
Net foreign exchange loss $ 74 $ 422