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Business Segment Information - Summary of Business Segment Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Revenues $ 17,311 $ 18,757 $ 13,682
Revenues from intersegment sales     0
Revenues 17,311 18,757 13,682
Operating profit or loss (1,248) 2,482 699
Income from equity interests in associates and joint ventures 94 446 287
Net financial results 897 128 (271)
Net profit / (loss) before income tax (257) 3,056 715
Income tax (1,020) (822) (699)
Net profit/ (loss) (1,277) 2,234 16
Acquisitions of property, plant and equipment 6,191 4,459 2,666
Acquisitions of right-of-use assets 404 306 284
Assets 25,035 25,912 23,290
Depreciation of property, plant and equipment 3,016 2,551 2,816
Amortization of intangible assets 37 43 51
Depreciation of right-of-use assets 220 214 201
Impairment of property, plant and equipment and intangible assets 2,288 123 115
Operating segments [member] | Upstream [member]      
Disclosure of operating segments [line items]      
Revenues 171 174 147
Revenues from intersegment sales 7,211 7,134 5,820
Revenues 7,382 7,308 5,967
Operating profit or loss (1,927) 1,310 80
Acquisitions of property, plant and equipment 4,773 3,417 2,168
Acquisitions of right-of-use assets 363 204 172
Assets 11,129 11,528 10,681
Depreciation of property, plant and equipment 2,452 1,947 2,259
Amortization of intangible assets     0
Depreciation of right-of-use assets 131 140 129
Impairment of property, plant and equipment and intangible assets 2,288 123 115
Operating segments [member] | Downstream [member]      
Disclosure of operating segments [line items]      
Revenues 14,888 16,016 11,220
Revenues from intersegment sales 100 109 64
Revenues 14,988 16,125 11,284
Operating profit or loss 896 1,523 945
Income from equity interests in associates and joint ventures 10 23 48
Acquisitions of property, plant and equipment 1,140 837 406
Acquisitions of right-of-use assets 19 102 105
Assets 9,916 9,530 8,321
Depreciation of property, plant and equipment 464 477 456
Amortization of intangible assets 30 29 39
Depreciation of right-of-use assets 71 59 61
Operating segments [member] | Gas and power segment [member]      
Disclosure of operating segments [line items]      
Revenues 2,017 2,304 2,069
Revenues from intersegment sales 357 391 161
Revenues 2,374 2,695 2,230
Operating profit or loss (3) 90 10
Income from equity interests in associates and joint ventures 84 428 239
Acquisitions of property, plant and equipment 178 78 27
Acquisitions of right-of-use assets 22 0 7
Assets 2,282 3,215 2,846
Depreciation of property, plant and equipment 44 48 28
Amortization of intangible assets 7 12 8
Depreciation of right-of-use assets 19 20 17
Operating segments [member] | Central Administration and Others [member]      
Disclosure of operating segments [line items]      
Revenues 235 263 246
Revenues from intersegment sales 781 779 484
Revenues 1,016 1,042 730
Operating profit or loss (270) (405) (198)
Income from equity interests in associates and joint ventures 0 (5)  
Acquisitions of property, plant and equipment 100 127 65
Assets 1,826 1,807 1,575
Depreciation of property, plant and equipment 56 79 73
Amortization of intangible assets 0 2 4
Consolidation Adjustments [member]      
Disclosure of operating segments [line items]      
Revenues from intersegment sales (8,449) (8,413) (6,529)
Revenues (8,449) (8,413) (6,529)
Operating profit or loss 56 (36) (138)
Assets (118) (168) (133)
Depreciation of right-of-use assets $ (1) $ (5) $ (6)