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Provisions - Summary of Changes in Group's Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Non current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance $ 2,519 $ 2,219 $ 2,421
Increases charged to expenses 471 662 323
Decreases charged to income (396) (136) (145)
Applications due to utilization (12) (7) 0
Reclassifications and other movements 53 (184) (264)
Net exchange and Translation effect (63) (35) (116)
Result from net monetary position (1) 0 0
Provisions ending balance 2,571 2,519 2,219
Non current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 872 599 733
Increases charged to expenses 187 400 119
Decreases charged to income (354) (42) (80)
Applications due to utilization (12) (7) 0
Reclassifications and other movements (66) (47) (71)
Net exchange and Translation effect (55) (31) (102)
Result from net monetary position (1) 0 0
Provisions ending balance 571 872 599
Non current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 96 66 64
Increases charged to expenses 69 105 46
Decreases charged to income (1) 0 (2)
Reclassifications and other movements (60) (71) (28)
Net exchange and Translation effect (8) (4) (14)
Provisions ending balance 96 96 66
Non current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 1,551 1,554 1,624
Increases charged to expenses 215 157 158
Decreases charged to income (41) (94) (63)
Reclassifications and other movements 179 (66) (165)
Net exchange and Translation effect 0 0 0
Provisions ending balance 1,904 1,551 1,554
Current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 188 73 91
Increases charged to expenses 0 1 3
Decreases charged to income 0 (37) (14)
Applications due to utilization (139) (48) (33)
Reclassifications and other movements 184 211 42
Net exchange and Translation effect (34) (12) (16)
Provisions ending balance 199 188 73
Current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 22 23 21
Increases charged to expenses 0 1 3
Decreases charged to income 0 (37) (14)
Applications due to utilization (35) (7) (2)
Reclassifications and other movements 35 42 15
Net exchange and Translation effect 0 0 0
Provisions ending balance 22 22 23
Current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 68 31 32
Applications due to utilization (48) (22) (13)
Reclassifications and other movements 60 71 28
Net exchange and Translation effect (34) (12) (16)
Provisions ending balance 46 68 31
Current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 98 19 38
Applications due to utilization (56) (19) (18)
Reclassifications and other movements 89 98 (1)
Net exchange and Translation effect 0 0 0
Provisions ending balance $ 131 $ 98 $ 19