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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.

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease in property, plant and equipment through classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Property, plant and equipment; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_e&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23_e&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B13 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_102&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_104&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_75_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e&doctype=Standard -URIDate 2023-03-23 + Details
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