v3.26.1
Revenues - Summary of Breakdown of Revenues by Type of Good or Service (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 18,284 $ 19,124 $ 16,995
Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,151 6,588 6,620
Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,916 4,048 3,493
Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers [1] 2,201 2,248 1,673
Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 975 1,023 427
Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 791 910 1,047
Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 414 528 614
LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 459 472 379
Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 98 112 95
Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 386 471 438
Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 326 389 594
Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 568 467 224
Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 118 85 172
Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 116 121 76
Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 135 184 102
Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 286 433 99
Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 175 160 181
Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 238 192 249
LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 51 51 50
Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 880 642 462
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 88 50 32
Upstream [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers [1] 27    
Upstream [member] | Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 7    
Upstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 54 50 32
Midstream and Downstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 15,151 15,892 14,863
Midstream and Downstream [member] | Diesel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,151 6,588 6,620
Midstream and Downstream [member] | Gasolines [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,916 4,048 3,493
Midstream and Downstream [member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers [1] 19 18 11
Midstream and Downstream [member] | Crude oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 968 1,023 427
Midstream and Downstream [member] | Jet fuel [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 791 910 1,047
Midstream and Downstream [member] | Lubricants and by-products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 414 528 614
Midstream and Downstream [member] | LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 459 472 379
Midstream and Downstream [member] | Fuel oil [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 98 112 95
Midstream and Downstream [member] | Petrochemicals [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 386 471 438
Midstream and Downstream [member] | Fertilizers and crop protection products [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 326 389 594
Midstream and Downstream [member] | Flours, oils and grains [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 568 467 224
Midstream and Downstream [member] | Asphalts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 118 85 172
Midstream and Downstream [member] | Goods for resale at gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 116 121 76
Midstream and Downstream [member] | Virgin naphtha [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 175 160 181
Midstream and Downstream [member] | Petroleum coke [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 238 192 249
Midstream and Downstream [member] | LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 51 51 50
Midstream and Downstream [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 357 257 193
LNG and Integrated Gas [Member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,487 1,483 1,328
LNG and Integrated Gas [Member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers [1] 1,479 1,470 1,311
LNG and Integrated Gas [Member] | LNG regasification [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 0 0 0
LNG and Integrated Gas [Member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 8 13 17
New Energies [Member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 834 885 400
New Energies [Member] | Natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers [1] 676 760 351
New Energies [Member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 158 125 49
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 724 814 372
Central Administration and Others [member] | Income from services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 135 184 102
Central Administration and Others [member] | Income from construction contracts [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 286 433 99
Central Administration and Others [member] | Other goods and services [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 303 $ 197 $ 171
[1] Includes 1,538, 1,550 and 1,398 corresponding to sales of natural gas produced by the Company for the years ended December 31, 2025, 2024 and 2023, respectively.