v3.26.1
Revenues - Summary of Breakdown of Revenues by Sales Channels (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
Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,546 7,038 6,541
Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 591 498 458
Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 438 310 171
Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 424 488 170
Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 4,507 5,031 5,163
Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,849 1,823 1,804
Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 524 658 614
Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,623 1,699 1,043
Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 245 179 141
Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 250 181 143
Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,287 1,219 747
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 88 50 32
Upstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 21    
Upstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 7    
Upstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 60 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] | Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,546 7,038 6,541
Midstream and Downstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 12 48 46
Midstream and Downstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,764 3,942 4,200
Midstream and Downstream [member] | Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,849 1,823 1,804
Midstream and Downstream [member] | Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 524 658 614
Midstream and Downstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,623 1,699 1,043
Midstream and Downstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 238 179 141
Midstream and Downstream [member] | Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 250 181 143
Midstream and Downstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 345 324 331
Gas and power [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,487 1,483 1,328
Gas and power [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 397 404 393
Gas and power [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 438 310 171
Gas and power [member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 0 0 0
Gas and power [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 652 769 764
Gas and power [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 0 0 0
New Energies [Member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 834 885 400
New Energies [Member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 182 46 19
New Energies [Member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 424 488 170
New Energies [Member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 70 320 199
New Energies [Member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 158 31 12
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 724 814 372
Central Administration and Others [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 724 $ 814 $ 372