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Investments (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
Property, plant and equipment $ 153,424 $ 130,169 $ 125,330  
Other non-current assets 2,315 1,553    
Total assets 217,067 187,191    
Current liabilities 33,860 31,380    
Non-current liabilities 104,232 85,975    
Shareholders' equity 78,975 69,836 69,812 $ 59,876
Non-controlling interest 392 344    
Total liabilities and equity 217,067 187,191    
Sales revenues 102,409 124,474 83,966  
Net income for the year 24,995 36,755 $ 19,986  
Countries Of Domicile [Member] | Associates [member]        
IfrsStatementLineItems [Line Items]        
Current assets 7,910 6,642    
Non-current assets 2,591 2,491    
Property, plant and equipment 8,082 7,380    
Other non-current assets 1,263 605    
Total assets 19,846 17,118    
Current liabilities 5,096 4,473    
Non-current liabilities 13,182 11,263    
Shareholders' equity 1,690 1,587    
Non-controlling interest (122) (205)    
Total liabilities and equity 19,846 17,118    
Sales revenues 14,199 18,709    
Net income for the year $ (849) $ (146)    
Countries Of Domicile [Member] | Associates [member] | Bottom of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 18.80% 18.80%    
Countries Of Domicile [Member] | Associates [member] | Top of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 38.80% 38.80%    
Countries Of Domicile [Member] | Joint ventures [member]        
IfrsStatementLineItems [Line Items]        
Current assets $ 330 $ 295    
Non-current assets 272 231    
Property, plant and equipment 525 508    
Other non-current assets 41 37    
Total assets 1,168 1,071    
Current liabilities 313 294    
Non-current liabilities 533 494    
Shareholders' equity 315 277    
Non-controlling interest 7 6    
Total liabilities and equity 1,168 1,071    
Sales revenues 1,036 1,159    
Net income for the year $ 5 $ 72    
Ownership interest 20.00% 20.00%    
Countries Of Domicile [Member] | Joint ventures [member] | Bottom of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 20.00% 20.00%    
Countries Of Domicile [Member] | Joint ventures [member] | Top of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 50.00% 50.00%    
M P Gulf Of Mexico L L C [Member] | Joint ventures [member]        
IfrsStatementLineItems [Line Items]        
Current assets $ 537 $ 481    
Non-current assets 66 139    
Property, plant and equipment 1,863 2,690    
Other non-current assets 1 1    
Total assets 2,467 3,311    
Current liabilities 365 344    
Non-current liabilities 424 548    
Shareholders' equity 1,336 2,045    
Non-controlling interest 342 374    
Total liabilities and equity 2,467 3,311    
Sales revenues 907 1,408    
Net income for the year 408 887    
Other Companies Abroad [Member] | Joint ventures [member]        
IfrsStatementLineItems [Line Items]        
Current assets 275 410    
Non-current assets 9 17    
Property, plant and equipment 189 191    
Total assets 473 618    
Current liabilities 70 145    
Non-current liabilities 52 32    
Shareholders' equity 351 291    
Non-controlling interest   150    
Total liabilities and equity 473 618    
Sales revenues   32    
Net income for the year $ 21 $ 162    
Other Companies Abroad [Member] | Joint ventures [member] | Bottom of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 34.00% 34.00%    
Other Companies Abroad [Member] | Joint ventures [member] | Top of range [member]        
IfrsStatementLineItems [Line Items]        
Ownership interest 45.00% 45.00%