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Schedule of property plant and equipment by class of assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 $ 125,330 $ 124,201
Property plant and equipment 127,419 125,914
Additions 6,915 4,660
Decommissioning costs - Additions to / review of estimates 11 (1)
Capitalized borrowing costs 530 478
Signature Bonuses Transfers (note 16.1) 840  
Write-offs (3,689) (299)
Transfers 87 76
Transfers to assets held for sale (3,469) (1,450)
Depreciation, amortization and depletion (7,361) (6,134)
Impairment recognition (108) (194)
Impairment reversal 25 88
Cumulative  translation adjustment 8,308 4,489
Balance at June 30, 2021 $ 127,419 125,914
Right-of-use assets [member] | Bottom of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 2 years  
Right-of-use assets [member] | Top of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 47 years  
Gross carrying amount [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 $ 216,407  
Property plant and equipment 224,455 232,509
Balance at June 30, 2021 224,455 232,509
Gross carrying amount [member] | Right-of-use assets [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 26,382  
Property plant and equipment 27,971 25,020
Balance at June 30, 2021 27,971 25,020
Accumulated depreciation and amortisation [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (91,077)  
Property plant and equipment (97,036) (106,595)
Balance at June 30, 2021 (97,036) (106,595)
Accumulated depreciation and amortisation [member] | Right-of-use assets [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (9,330)  
Property plant and equipment (10,265) (9,660)
Balance at June 30, 2021 (10,265) (9,660)
Land buildings and improvement [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 2,383 3,043
Property plant and equipment 2,543 3,109
Additions
Decommissioning costs - Additions to / review of estimates
Capitalized borrowing costs
Signature Bonuses Transfers (note 16.1)  
Write-offs
Transfers 65 (23)
Transfers to assets held for sale (13)
Depreciation, amortization and depletion (44) (56)
Impairment recognition
Impairment reversal
Cumulative  translation adjustment 152 145
Balance at June 30, 2021 $ 2,543 3,109
Land buildings and improvement [member] | Bottom of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 25 years  
Land buildings and improvement [member] | Top of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 50 years  
Land buildings and improvement [member] | Gross carrying amount [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 $ 4,080  
Property plant and equipment 4,308 4,744
Balance at June 30, 2021 4,308 4,744
Land buildings and improvement [member] | Accumulated depreciation and amortisation [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (1,697)  
Property plant and equipment (1,765) (1,635)
Balance at June 30, 2021 (1,765) (1,635)
Equipment and other assets [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 [1] 53,126 58,680
Property plant and equipment [1] 53,950 58,957
Additions [1] 442 728
Decommissioning costs - Additions to / review of estimates [1]
Capitalized borrowing costs [1]
Signature Bonuses Transfers (note 16.1) [1]  
Write-offs [1] (723) (47)
Transfers [1] 1,706 779
Transfers to assets held for sale [1] (1,857) (1,037)
Depreciation, amortization and depletion [1] (2,369) (2,009)
Impairment recognition [1] (48) (186)
Impairment reversal [1] 12 42
Cumulative  translation adjustment [1] 3,661 2,007
Balance at June 30, 2021 [1] $ 53,950 58,957
Equipment and other assets [member] | Bottom of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 3 years  
Equipment and other assets [member] | Top of range [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Weighted average of useful life in years 31 years  
Equipment and other assets [member] | Gross carrying amount [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 $ 98,085  
Property plant and equipment 102,174 110,783
Balance at June 30, 2021 102,174 110,783
Equipment and other assets [member] | Accumulated depreciation and amortisation [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (44,959)  
Property plant and equipment (48,224) (51,826)
Balance at June 30, 2021 (48,224) (51,826)
Assets under construction [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 [2] 16,922 15,443
Property plant and equipment [2] 16,306 16,346
Additions [2] 3,209 2,842
Decommissioning costs - Additions to / review of estimates [2]
Capitalized borrowing costs [2] 530 478
Signature Bonuses Transfers (note 16.1) [2]  
Write-offs [2] (963) (167)
Transfers [2] (4,095) (2,705)
Transfers to assets held for sale [2] (343) (159)
Depreciation, amortization and depletion [2]
Impairment recognition [2] (18)
Impairment reversal [2] 2 27
Cumulative  translation adjustment [2] 1,062 587
Balance at June 30, 2021 [2] 16,306 16,346
Assets under construction [member] | Gross carrying amount [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 25,954  
Property plant and equipment 25,582 28,422
Balance at June 30, 2021 25,582 28,422
Assets under construction [member] | Accumulated depreciation and amortisation [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (9,032)  
Property plant and equipment (9,276) (12,076)
Balance at June 30, 2021 (9,276) (12,076)
Exploration and development costs [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 [3] 35,847 31,166
Property plant and equipment [3] 36,914 32,142
Additions [3] 9 1
Decommissioning costs - Additions to / review of estimates [3] 11 (1)
Capitalized borrowing costs [3]
Signature Bonuses Transfers (note 16.1) [3] 840  
Write-offs [3] (614) (14)
Transfers [3] 2,411 2,026
Transfers to assets held for sale [3] (1,248) (257)
Depreciation, amortization and depletion [3] (2,680) (2,002)
Impairment recognition [3] (42) (8)
Impairment reversal [3] 11 19
Cumulative  translation adjustment [3] 2,369 1,212
Balance at June 30, 2021 [3] 36,914 32,142
Exploration and development costs [member] | Gross carrying amount [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 61,906  
Property plant and equipment 64,420 63,540
Balance at June 30, 2021 64,420 63,540
Exploration and development costs [member] | Accumulated depreciation and amortisation [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 (26,059)  
Property plant and equipment (27,506) (31,398)
Balance at June 30, 2021 (27,506) (31,398)
Right-of-use assets [member]    
DisclosurePropertyPlantAndEquipmentLineItems [Line Items]    
Balance at December 31, 2020 17,052 15,869
Property plant and equipment 17,706 15,360
Additions 3,255 1,089
Decommissioning costs - Additions to / review of estimates
Capitalized borrowing costs
Signature Bonuses Transfers (note 16.1)  
Write-offs (1,389) (71)
Transfers (1)
Transfers to assets held for sale (8) 3
Depreciation, amortization and depletion (2,268) (2,067)
Impairment recognition
Impairment reversal
Cumulative  translation adjustment 1,064 538
Balance at June 30, 2021 $ 17,706 $ 15,360
[1] It comprises mainly signature bonuses (amounts paid in concession contracts for oil or natural gas exploration and production sharing), in addition to public service concessions, trademarks and patents and others.
[2] Transfer to PP&E relating to Sépia and Atapu.
[3] Mainly composed of assets with indefinite useful lives, which are reviewed annually to determine whether events and circumstances continue to support an indefinite useful life assessment.