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Income taxes - Tax loss carryforward (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Taxes losses carryforward $ 5,908 $ 5,757  
Deferred tax asset (liability) 9,357 9,560 $ 8,565
Employee post retirement obligations      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) 411 504  
Provision For litigation      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) 364 346  
Asset Retirement Obligations [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) 4,349 4,384  
Fair value of financial instruments      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) 839 1,373  
Fair Value Of Property Plant And Equipment [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) (2,392) (2,857)  
Other temporary differences [member]      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) (122) 53  
Assets Temporary Differences [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) 10,770 11,441  
Liabilities Temporary Differences [Member]      
IfrsStatementLineItems [Line Items]      
Deferred tax asset (liability) $ (1,413) $ (1,881)