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Other operating income and expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Total other operating income $ 105 $ 51 $ 77
Total other operating expenses (58) (36) (43)
Contractual Penalty [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 7
Commercial Interests [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 27 30 52
Provision For Contingencies [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (16) (7) (5)
Provision For Environmental Remediation [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (15)
Decrease In Property Plant And Equipment [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (1)
Impairment On Tax Credits [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (4)
Tax On Bank Transactions [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (13) (11) (16)
Donations And Contributions [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (2) (3) (2)
Institutional Relationships [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (3) (2) (2)
Royalties Of Argentine Natural Gas Production Promotion Plan [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (5)
Other [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating expenses (4) (12) (14)
Insurance Recovery [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 3 3 4
Services To Third Parties [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 2 4 8
Profit For Property Plant And Equipment Sale [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 1 1
Result From The Sale Of Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 2
Dividends Received [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 1 1
Reversal Of Contingencies Provision [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 13 2 1
Recovery Of Tax Charges [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 2
Surplus Gas Injection Compensation [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income 51
Other [Member]      
IfrsStatementLineItems [Line Items]      
Total other operating income $ 4 $ 3 $ 11