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Taxes (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]    
Balance at beginning of period, Assets $ 10,770 $ 11,441
Balance at beginning of period, Liabilities 1,413 1,881
Balance at beginning of period, Deferred taxes net 9,357 9,560
Taxes losses carryforward, Assets (609) (68)
Taxes losses carryforward, Deferred taxes net (609) (68)
Provision for asset retirement obligations and other liabilities, Assets (1,123) (488)
Provision for asset retirement obligations and other liabilities, Liabilities 86 114
Provision for asset retirement obligations and other liabilities, Deferred taxes net (1,209) (602)
Fair value of financial instruments, Assets (168) (634)
Fair value of financial instruments, Deferred taxes net (168) (634)
Allocated goodwill, Liabilities (64) (607)
Allocated goodwill, Deferred taxes net 64 607
Other, Assets 251 (254)
Other, Deferred taxes net 251 (254)
Effect in income statement, Assets (1,649) (1,444)
Effect in income statement, Liabilities 22 (493)
Effect in income statement, Deferred taxes net (1,671) (951)
Employee post-retirement obligation, Assets 34 (116)
Employee post-retirement obligation, Deferred taxes net 34 (116)
Fair value of financial instruments, Assets 32 73
Fair value of financial instruments, Deferred taxes net 32 73
Other comprehensive income, Assets 66 (43)
Other comprehensive income, Deferred taxes net 66 (43)
Transfers between assets and liabilities, Assets (371) 130
Transfers between assets and liabilities, Liabilities (371) 130
Translation adjustment, Assets 749 686
Translation adjustment, Liabilities 19 (77)
Translation adjustment, Deferred taxes net 730 763
Sale of California Steel Industries, Liabilities   (28)
Sale of California Steel Industries, Deferred taxes net   28
Transfer to asset to held for sale, Liabilities (213)  
Balance at ending of period, Assets 9,565 10,770
Balance at ending of period, Liabilities 870 1,413
Balance at ending of period, Deferred taxes net $ 8,482 $ 9,357