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Property, plant and equipment - Summary of property, plant and equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | $ 62,093 | $ 58,855 |
Adjustment on currency translation (c) | (4,157) | 3,381 |
Adjustments to capitalised closure costs | 486 | 710 |
Amounts capitalised | 296 | 224 | $ 111
Additions | 5,301 | 4,751 |
Depreciation for the year (a) (e) | (3,882) | (4,198) | (4,567)
Impairment charges (f) | (130) | (435) |
Disposals | (130) | (123) |
Subsidiaries no longer consolidated (g) | (3,386) | (749) |
Transfers and other movements (h) | (130) | (323) |
Property, plant and equipment at end of period | 56,361 | 62,093 | 58,855
Non-current assets held under finance leases (i) | 31 | 37 |
Non-current assets pledged as security (j) | 13,221 | 12,303 |
Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 115,889 |  |
Property, plant and equipment at end of period | 104,294 | 115,889 |
Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (53,796) |  |
Property, plant and equipment at end of period | (47,933) | (53,796) |
Mining properties and leases [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 11,488 | 10,848 |
Adjustment on currency translation (c) | (689) | 495 |
Adjustments to capitalised closure costs | 486 | 710 |
Additions | 403 | 230 |
Depreciation for the year (a) (e) | (664) | (673) |
Impairment charges (f) | (3) | (304) |
Disposals | (1) |  |
Subsidiaries no longer consolidated (g) | (1,103) | (211) |
Transfers and other movements (h) | 1,146 | 393 |
Property, plant and equipment at end of period | 11,063 | 11,488 | 10,848
Non-current assets pledged as security (j) | 3,054 | 3,307 |
Mining properties and leases [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 24,691 |  |
Property, plant and equipment at end of period | 23,318 | 24,691 |
Mining properties and leases [member] | Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (13,203) |  |
Property, plant and equipment at end of period | (12,255) | (13,203) |
Land and buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 7,376 | 7,316 |
Adjustment on currency translation (c) | (548) | 461 |
Additions | 80 | 41 |
Depreciation for the year (a) (e) | (382) | (403) |
Impairment charges (f) | (20) | (2) |
Disposals | (54) | (57) |
Subsidiaries no longer consolidated (g) | (377) | (95) |
Transfers and other movements (h) | 188 | 115 |
Property, plant and equipment at end of period | 6,263 | 7,376 | 7,316
Non-current assets pledged as security (j) | 385 | 410 |
Land and buildings [Member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 12,029 |  |
Property, plant and equipment at end of period | 10,601 | 12,029 |
Land and buildings [Member] | Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (4,653) |  |
Property, plant and equipment at end of period | (4,338) | (4,653) |
Plant and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 36,285 | 35,706 |
Adjustment on currency translation (c) | (2,671) | 2,242 |
Additions | 459 | 646 |
Depreciation for the year (a) (e) | (2,836) | (3,122) |
Impairment charges (f) | (101) | (128) |
Disposals | (71) | (40) |
Subsidiaries no longer consolidated (g) | (1,392) | (417) |
Transfers and other movements (h) | 2,346 | 1,398 |
Property, plant and equipment at end of period | 32,019 | 36,285 | 35,706
Non-current assets held under finance leases (i) | 31 | 37 |
Non-current assets pledged as security (j) | 5,194 | 5,308 |
Plant and equipment [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 71,903 |  |
Property, plant and equipment at end of period | 63,051 | 71,903 |
Plant and equipment [member] | Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (35,618) |  |
Property, plant and equipment at end of period | (31,032) | (35,618) |
Capital works in progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 6,944 | 4,985 |
Adjustment on currency translation (c) | (249) | 183 |
Amounts capitalised | 296 | 224 |
Additions | 4,359 | 3,834 |
Impairment charges (f) | (6) | (1) |
Disposals | (4) | (26) |
Subsidiaries no longer consolidated (g) | (514) | (26) |
Transfers and other movements (h) | (3,810) | (2,229) |
Property, plant and equipment at end of period | 7,016 | 6,944 | $ 4,985
Non-current assets pledged as security (j) | 4,588 | 3,278 |
Capital works in progress [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 7,266 |  |
Property, plant and equipment at end of period | 7,324 | 7,266 |
Capital works in progress [member] | Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (322) |  |
Property, plant and equipment at end of period | $ (308) | $ (322) |

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- 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment resulting from the loss of control of a subsidiary. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 74 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_74_a&doctype=Standard -URIDate 2017-03-09 + Details
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