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Summary of composition of deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
DisclosureTaxesLineItems [Line Items]    
Nature Others  
Composition of deferred tax assets and liabilities $ (6,347) $ (625)
Composition of deferred tax assets 548 604
Composition of deferred tax liabilities $ (6,895) (1,229)
Depreciation amortization and write offs of assets [member]    
DisclosureTaxesLineItems [Line Items]    
Nature PP&E - Exploration and decommissioning costs  
Composition of deferred tax assets and liabilities $ (781) (1,362)
Amortization impairment reversals write offs assets [member]    
DisclosureTaxesLineItems [Line Items]    
Nature PP&E - Impairment  
Composition of deferred tax assets and liabilities $ 4,643 4,382
Depreciation amortization and write offs of assets one [member]    
DisclosureTaxesLineItems [Line Items]    
Nature PP&E - depreciation methods and capitalized borrowing costs  
Composition of deferred tax assets and liabilities $ (15,461) (12,924)
Payments receipts considerations [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Loans, trade and other receivables / payables and financing  
Composition of deferred tax assets and liabilities $ 1,418 3,490
Tax depreciation [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Lease liabilities  
Composition of deferred tax assets and liabilities $ 589 1,244
Payments and use of provisions [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Provision for legal proceedings  
Composition of deferred tax assets and liabilities $ 757 605
Taxable income compensation [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Tax loss carryforwards  
Composition of deferred tax assets and liabilities $ 643 1,827
Sales writedowns llosses [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Inventories  
Composition of deferred tax assets and liabilities $ 340 228
Payments and use provisions [member]    
DisclosureTaxesLineItems [Line Items]    
Nature Employee Benefits  
Composition of deferred tax assets and liabilities $ 1,216 1,250
Others [member]    
DisclosureTaxesLineItems [Line Items]    
Composition of deferred tax assets and liabilities $ 289 $ 635