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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | $ 58,855 | $ 61,057 |
Adjustment on currency translation (c) | 3,381 | 353 |
Adjustments to capitalised closure costs | 710 | (123) |
Amounts capitalised | 224 | 111 | $ 254
Additions | 4,751 | 3,128 |
Depreciation for the year (a) (e) | (4,198) | (4,567) | (4,438)
Impairment charges, net of reversals (f) | (435) | (248) |
Disposals | (123) | (258) |
Subsidiaries no longer consolidated (g) | (749) | (359) |
Transfers and other movements (h) | (323) | (239) |
Property, plant and equipment at end of period | 62,093 | 58,855 | 61,057
Non-current assets held under finance leases (i) | 37 | 38 |
Non-current assets pledged as security (j) | 12,303 | 11,169 |
Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 107,837 |  |
Property, plant and equipment at end of period | 115,889 | 107,837 |
Accumulated amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | (48,982) |  |
Property, plant and equipment at end of period | (53,796) | (48,982) |
Mining properties and leases [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 10,848 | 11,146 |
Adjustment on currency translation (c) | 495 | 137 |
Adjustments to capitalised closure costs | 710 | (123) |
Additions | 230 | 237 |
Depreciation for the year (a) (e) | (673) | (760) |
Impairment charges, net of reversals (f) | (304) | (130) |
Disposals |  | (3) |
Subsidiaries no longer consolidated (g) | (211) | (40) |
Transfers and other movements (h) | 393 | 384 |
Property, plant and equipment at end of period | 11,488 | 10,848 | 11,146
Non-current assets pledged as security (j) | 3,307 | 3,310 |
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 | 22,989 |  |
Property, plant and equipment at end of period | 24,691 | 22,989 |
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 | (12,141) |  |
Property, plant and equipment at end of period | (13,203) | (12,141) |
Land and buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 7,316 | 7,571 |
Adjustment on currency translation (c) | 461 | 62 |
Additions | 41 | 47 |
Depreciation for the year (a) (e) | (403) | (429) |
Impairment charges, net of reversals (f) | (2) |  |
Disposals | (57) | (169) |
Subsidiaries no longer consolidated (g) | (95) | (88) |
Transfers and other movements (h) | 115 | 322 |
Property, plant and equipment at end of period | 7,376 | 7,316 | 7,571
Non-current assets pledged as security (j) | 410 | 423 |
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 | 11,444 |  |
Property, plant and equipment at end of period | 12,029 | 11,444 |
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 | (4,128) |  |
Property, plant and equipment at end of period | (4,653) | (4,128) |
Plant and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 35,706 | 37,900 |
Adjustment on currency translation (c) | 2,242 | 138 |
Additions | 646 | 537 |
Depreciation for the year (a) (e) | (3,122) | (3,378) |
Impairment charges, net of reversals (f) | (128) | (112) |
Disposals | (40) | (86) |
Subsidiaries no longer consolidated (g) | (417) | (217) |
Transfers and other movements (h) | 1,398 | 924 |
Property, plant and equipment at end of period | 36,285 | 35,706 | 37,900
Non-current assets held under finance leases (i) | 37 | 38 |
Non-current assets pledged as security (j) | 5,308 | 5,332 |
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 | 68,030 |  |
Property, plant and equipment at end of period | 71,903 | 68,030 |
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 | (32,324) |  |
Property, plant and equipment at end of period | (35,618) | (32,324) |
Capital works in progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment at beginning of period | 4,985 | 4,440 |
Adjustment on currency translation (c) | 183 | 16 |
Amounts capitalised | 224 | 111 |
Additions | 3,834 | 2,307 |
Impairment charges, net of reversals (f) | (1) | (6) |
Disposals | (26) |  |
Subsidiaries no longer consolidated (g) | (26) | (14) |
Transfers and other movements (h) | (2,229) | (1,869) |
Property, plant and equipment at end of period | 6,944 | 4,985 | $ 4,440
Non-current assets pledged as security (j) | 3,278 | 2,104 |
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 | 5,374 |  |
Property, plant and equipment at end of period | 7,266 | 5,374 |
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 | (389) |  |
Property, plant and equipment at end of period | $ (322) | $ (389) |

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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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_i&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2016-03-30&anchor=para_26_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_vii&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_75_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_ii&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_v&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_98_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_viii&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 74 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_74_a&doctype=Standard -URIDate 2016-03-31 + Details
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