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Revenues - Summary of Breakdown of Revenues by Sales Channels (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
Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 7,038 6,541 6,673
Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 498 458 474
Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 310 171 179
Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 488 170 308
Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 5,031 5,163 4,933
Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,823 1,804 2,697
Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 658 614 722
Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,699 1,043 901
Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 179 141 688
Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 181 143 177
Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,219 747 685
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 50 32 51
Upstream [member] | Other sales channels [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] | Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 7,038 6,541 6,673
Downstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 48 46 13
Downstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 3,922 4,202 3,890
Downstream [member] | Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,823 1,804 2,697
Downstream [member] | Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 658 614 722
Downstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,699 1,043 901
Downstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 179 141 688
Downstream [member] | Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 181 143 177
Downstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 256 240 137
Gas and power [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 2,458 1,815 2,104
Gas and power [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 450 412 461
Gas and power [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 310 171 179
Gas and power [member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 488 170 308
Gas and power [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,109 961 1,043
Gas and power [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 101 101 113
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 812 374 384
Central Administration and Others [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 812 $ 374 $ 384