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Property, plant and equipment - Movements (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]    
Balance at beginning of year $ 44,938 $ 41,931
Additions (i) [1] 2,449 2,372
Disposals (80) (77)
Assets retirement obligation 99 (1,077)
Depreciation, depletion and amortization (1,414) (1,360)
Translation adjustment 2,674 1,377
Impairment reversal   214
Balance at end of year 48,666 43,166
Transfer to asset held for sale - Midwestern System   (214)
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 83,547 76,228
Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (34,881) (33,062)
Land and buildings [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 8,913 8,137
Disposals (8) (14)
Depreciation, depletion and amortization (224) (205)
Translation adjustment 607 348
Impairment reversal   56
Transfers 772 240
Balance at end of year 10,060 8,506
Transfer to asset held for sale - Midwestern System   (56)
Land and buildings [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 17,700 15,612
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (7,640) (7,106)
Facilities [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 8,042 7,232
Disposals (8) (8)
Depreciation, depletion and amortization (250) (245)
Translation adjustment 608 370
Impairment reversal   34
Transfers 586 297
Balance at end of year 8,978 7,646
Transfer to asset held for sale - Midwestern System   (34)
Facilities [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 14,330 12,369
Facilities [Member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (5,352) (4,723)
Machinery [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 4,984 4,743
Disposals (5) (4)
Depreciation, depletion and amortization (364) (351)
Translation adjustment 229 128
Impairment reversal   64
Transfers 371 303
Balance at end of year 5,215 4,819
Transfer to asset held for sale - Midwestern System   (64)
Machinery [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 12,418 11,291
Machinery [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (7,203) (6,472)
Tangible exploration and evaluation assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 7,112 7,742
Assets retirement obligation 99 (1,077)
Depreciation, depletion and amortization (241) (236)
Translation adjustment 302 75
Impairment reversal   39
Transfers 46 347
Balance at end of year 7,318 6,851
Transfer to asset held for sale - Midwestern System   (39)
Tangible exploration and evaluation assets [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 16,285 16,317
Tangible exploration and evaluation assets [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (8,967) (9,466)
Railway Equipment [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 2,475 2,334
Disposals (5) (5)
Depreciation, depletion and amortization (81) (82)
Translation adjustment 198 151
Transfers 47 73
Balance at end of year 2,634 2,471
Property, plant and equipment, cost 4,455 4,021
Railway Equipment [Member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (1,821) (1,550)
Right-of-use assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 1,455 1,537
Additions (i) [1] 19 29
Depreciation, depletion and amortization (91) (94)
Translation adjustment   26
Impairment reversal 31  
Balance at end of year 1,414 1,498
Right-of-use assets [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 2,196 2,062
Right-of-use assets [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (782) (564)
Other property, plant and equipment [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 2,632 2,484
Disposals (1) (1)
Depreciation, depletion and amortization (163) (147)
Translation adjustment 153 78
Impairment reversal   21
Transfers 166 207
Balance at end of year 2,787 2,621
Transfer to asset held for sale - Midwestern System   (21)
Other property, plant and equipment [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost 5,903 5,802
Other property, plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated depreciation (3,116) (3,181)
Construction in progress [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 9,325 7,722
Additions (i) [1] 2,430 2,343
Disposals (53) (45)
Translation adjustment 546 201
Transfers (1,988) (1,467)
Balance at end of year 10,260 8,754
Construction in progress [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment, cost $ 10,260 $ 8,754
[1] Includes capitalized interest.