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Contractual Commitments - Assignment agreement of CAN 100 exploration permit (offshore) – Block E-1 Reconversion (Detail) - CAN 100 Exploration Permit Block E-1 Reconversion [Member] - Off Shore [Member] - Assignment Agreement [Member] - USD ($)
$ in Millions
Dec. 14, 2021
Jan. 14, 2021
Apr. 22, 2020
Oct. 08, 2019
Statement [Line Items]        
Proportion of ownership interest in joint operation       50.00%
Equinor [Member]        
Statement [Line Items]        
Proportion of ownership interest in joint operation   35.00%   50.00%
Cash flows received from the counterparty in respect of the exploration permit     $ 22  
Equinor [Member] | Shell Argentina [Member]        
Statement [Line Items]        
Cash flows received from the counterparty in respect of the exploration permit   $ 5    
Percentage Of Interest In Joint Operation Assigned   15.00%    
Additional amount received in respect of the exploration permit $ 5