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Revenues - Summary of Breakdown of Revenues by Sales Channels (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
Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,541 6,673 4,898
Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 458 474 639
Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 171 179 187
Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 170 308 329
Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 5,163 4,933 2,855
Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,804 2,697 1,917
Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 614 722 671
Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,043 901 576
Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 141 688 570
Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 143 177 149
Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 747 685 593
Upstream [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 171 174 147
Upstream [member] | Other sales channels [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] | Gas stations [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 6,541 6,673 4,898
Downstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 46 13 131
Downstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 4,202 3,890 2,104
Downstream [member] | Agriculture [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,804 2,697 1,917
Downstream [member] | Petrochemical industry [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 614 722 671
Downstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,043 901 576
Downstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 141 688 570
Downstream [member] | Commercialization of LPG [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 143 177 149
Downstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 240 137 129
Gas and power [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 1,815 2,104 1,852
Gas and power [member] | Power plants [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 412 461 508
Gas and power [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 171 179 187
Gas and power [member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 170 308 329
Gas and power [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 961 1,043 751
Gas and power [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 101 113 77
Central Administration and Others [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers 235 261 240
Central Administration and Others [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Revenue from contracts with customers $ 235 $ 261 $ 240