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Business Segment Information - Summary of Business Segment Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Revenues $ 19,293 $ 17,311 $ 18,757
Revenues from intersegment sales     0
Revenues 19,293 17,311 18,757
Operating profit or loss 1,480 (1,248) 2,482
Income from equity interests in associates and joint ventures 396 94 446
Net financial results (695) 897 128
Net profit / (loss) before income tax 1,181 (257) 3,056
Income tax 1,212 (1,020) (822)
Net profit / (loss) 2,393 (1,277) 2,234
Acquisitions of property, plant and equipment 5,600 6,191 4,459
Acquisitions of right-of-use assets 444 404 306
Assets 29,391 25,035 25,912
Depreciation of property, plant and equipment 2,446 3,016 2,551
Amortization of intangible assets 43 37 43
Depreciation of right-of-use assets 270 220 214
Impairment of property, plant and equipment and inventories write-down 87 2,288 123
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues 50 32 51
Revenues from intersegment sales 8,225 7,211 7,134
Revenues 8,275 7,243 7,185
Operating profit or loss 515 (1,915) 1,306
Acquisitions of property, plant and equipment 4,177 4,717 3,378
Acquisitions of right-of-use assets 211 363 204
Assets 12,795 10,869 11,317
Depreciation of property, plant and equipment 1,809 2,437 1,935
Amortization of intangible assets     0
Depreciation of right-of-use assets 154 131 140
Impairment of property, plant and equipment and inventories write-down 79 2,288 123
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues 15,813 14,888 16,016
Revenues from intersegment sales 77 100 109
Revenues 15,890 14,988 16,125
Operating profit or loss 1,306 896 1,523
Income from equity interests in associates and joint ventures 45 10 23
Acquisitions of property, plant and equipment 1,151 1,140 837
Acquisitions of right-of-use assets 181 19 102
Assets 10,428 9,916 9,530
Depreciation of property, plant and equipment 492 464 477
Amortization of intangible assets 29 30 29
Depreciation of right-of-use assets 84 71 59
Impairment of property, plant and equipment and inventories write-down 3    
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues 2,618 2,017 2,304
Revenues from intersegment sales 397 357 391
Revenues 3,015 2,374 2,695
Operating profit or loss 146 (3) 90
Income from equity interests in associates and joint ventures 352 84 428
Acquisitions of property, plant and equipment 142 178 78
Acquisitions of right-of-use assets 24 22 0
Assets 3,500 2,282 3,215
Depreciation of property, plant and equipment 54 44 48
Amortization of intangible assets 13 7 12
Depreciation of right-of-use assets 31 19 20
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues 812 374 386
Revenues from intersegment sales 1,072 781 779
Revenues 1,884 1,155 1,165
Operating profit or loss (371) (282) (401)
Income from equity interests in associates and joint ventures (1) 0 (5)
Acquisitions of property, plant and equipment 130 156 166
Acquisitions of right-of-use assets 28    
Assets 2,896 2,086 2,018
Depreciation of property, plant and equipment 91 71 91
Amortization of intangible assets 1 0 2
Depreciation of right-of-use assets 1    
Impairment of property, plant and equipment and inventories write-down 5    
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from intersegment sales (9,771) (8,449) (8,413)
Revenues (9,771) (8,449) (8,413)
Operating profit or loss (116) 56 (36)
Assets (228) (118) (168)
Depreciation of right-of-use assets $ 0 $ (1) $ (5)