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Financial items (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finance Income Expense [Abstract]      
Foreign exchange gains (losses) derivative financial instruments $ 870 $ (1,288) $ 132
Other foreign exchange gains (losses) (823) 642 92
Net foreign exchange gains (losses) 47 (646) 224
Dividends received 39 44 75
Gains (losses) financial investments (348) 456 243
Interest income on other financial assets 38 108 125
Interest income non-current financial receivables 26 34 21
Interest income current financial assets and other financial items 48 113 281
Interest income and other financial items 151 298 502
Gains (losses) derivative financial instruments (708) 448 473
Interest expense bonds and bank loans and net interest on related derivatives (896) (951) (987)
Interest expense lease liabilities (93) (104) (126)
Capitalised borrowing costs 334 308 480
Accretion expense asset retirement obligations (453) (412) (456)
Interest expense current financial liabilities and other finance expense (114) (232) (360)
Interest and other finance expenses (1,223) (1,392) (1,450)
Net financial items (2,080) (836) (7)
Interest expense from the financial liabilities at amortised cost category 990 1,031 861
Net interest expense, fair value through profit or loss category   79 129
Net interest income, fair value through profit or loss category 94    
Fair value gain (loss) from the trading instruments held (724) 432 457
Net foreign exchange gain   $ 796  
Net foreign exchange loss $ 702   $ 74