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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 19,124 $ 16,995 $ 18,437
Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,588 6,620 6,837
Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 4,048 3,493 3,460
Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 2,248 1,673 1,897
Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,023 427 76
Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 910 1,047 1,031
Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 528 614 608
LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 472 379 472
Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 112 95 198
Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 471 438 495
Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 389 594 835
Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 467 224 773
Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 85 172 172
Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 121 76 102
Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 184 102 120
Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 433 99 135
Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 160 181 203
Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 192 249 405
LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 51 50 43
Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 642 462 575
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 50 32 51
Upstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 50 32 51
Downstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 15,804 14,774 15,898
Downstream [member] | Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,588 6,620 6,837
Downstream [member] | Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 4,048 3,493 3,460
Downstream [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 18 7 16
Downstream [member] | Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,023 427 76
Downstream [member] | Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 910 1,047 1,031
Downstream [member] | Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 528 614 608
Downstream [member] | LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 472 379 472
Downstream [member] | Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 112 95 198
Downstream [member] | Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 471 438 495
Downstream [member] | Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 389 594 835
Downstream [member] | Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 467 224 773
Downstream [member] | Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 85 172 172
Downstream [member] | Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 121 76 102
Downstream [member] | Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 160 181 203
Downstream [member] | Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 192 249 405
Downstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 220 158 215
Gas and power [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 2,458 1,815 2,104
Gas and power [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 2,230 1,666 1,881
Gas and power [member] | LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 51 50 43
Gas and power [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 177 99 180
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 812 374 384
Central Administration and Others [member] | Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 184 102 120
Central Administration and Others [member] | Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 433 99 135
Central Administration and Others [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 195 $ 173 $ 129