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Impairment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]      
  Impairment (losses) reversals, net $ (2,680) $ (1,315) $ 3,190
Exploratory assets (364)
Impairment on equity-accounted investments (2) (6) 383
Net effect within the statement of income (3,046) (1,321) 3,573
Losses (3,307) (1,640) (654)
Reversals $ 261 $ 319 $ 4,227