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Impairment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]      
Impairment (losses) reversals, net $ (1,531) $ (2,680) $ (1,315)
Exploratory assets (224) (364)
Impairment of equity-accounted investments 13 (2) (6)
Net effect within the statement of income (1,742) (3,046) (1,321)
Losses (1,955) (3,307) (1,640)
Reversals $ 213 $ 261 $ 319