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Taxes (Details 1) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Deferred tax assets taxes losses carryforward $ 5,704 $ 5,908  
Deferred tax assets 9,565 10,770 $ 11,441
Deferred tax liabilities (870) (1,413)  
Asset Retirement Obligations And Other Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 4,165 4,875  
Deferred tax liabilities (807) (714)  
Fair Value Of Financial Instruments [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 735 839  
Employee post retirement obligations [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 478 411  
Provision For Litigation [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 306 364  
Fair Value Of Property Plant And Equipment In Business Combination [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax liabilities (2,034) (2,205)  
Goodwill Amortization [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax liabilities (575) (518)  
Other temporary differences [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 723 397  
Temporary differences [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax assets 12,111 12,794  
Deferred tax liabilities $ (3,416) $ (3,437)