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Revenues - Summary of Breakdown of Revenues by Type of Good or Service (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 16,995 $ 18,437 $ 13,384
Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,620 6,837 4,498
Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,493 3,460 2,742
Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,673 1,897 1,726
Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 427 76 63
Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,047 1,031 337
Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 614 608 531
LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 379 472 458
Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 95 198 209
Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 438 495 476
Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 594 835 520
Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 224 773 629
Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 172 172 116
Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 76 102 70
Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 102 120 79
Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 99 135 123
Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 181 203 172
Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 249 405 191
LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 50 43 43
Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 462 575 401
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 171 174 147
Upstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 171 174 147
Downstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 14,774 15,898 11,145
Downstream [member] | Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,620 6,837 4,498
Downstream [member] | Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,493 3,460 2,742
Downstream [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 7 16 15
Downstream [member] | Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 427 76 63
Downstream [member] | Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,047 1,031 337
Downstream [member] | Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 614 608 531
Downstream [member] | LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 379 472 458
Downstream [member] | Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 95 198 209
Downstream [member] | Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 438 495 476
Downstream [member] | Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 594 835 520
Downstream [member] | Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 224 773 629
Downstream [member] | Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 172 172 116
Downstream [member] | Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 76 102 70
Downstream [member] | Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 181 203 172
Downstream [member] | Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 249 405 191
Downstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 158 215 118
Gas and power [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,815 2,104 1,852
Gas and power [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,666 1,881 1,711
Gas and power [member] | LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 50 43 43
Gas and power [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 99 180 98
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 235 261 240
Central Administration and Others [member] | Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 102 120 79
Central Administration and Others [member] | Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 99 135 123
Central Administration and Others [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 34 $ 6 $ 38