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Impairment charges - Summary of impairment charges (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge | $ (132) | $ (796) | $ (249)
Total impairment charge net of reversals in the financial information by business unit | (132) | (796) | (249)
Taxation (including related to EAUs) | 25 | 141 | 66
Non-controlling interests | 3 | 174 |
Total impairment in the income statement | (104) | (481) | (183)
Impairment charges, Tax | 25 |  |
Impairment charges, Non-controlling interests | 3 |  |
Impairment charge, net amount | (104) |  |
Intangible assets [Member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge | (2) | (357) | (1)
Property, plant and equipment [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge | (130) | (435) | (248)
Other assets and liabilities [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge |  | (4) |
Aluminium [Member] | ISAL Smelter [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge | (123) |  |
Impairment charges, Tax | 25 |  |
Impairment charge, net amount | (98) |  |
Energy & Minerals [Member] | Roughrider [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge |  | (357) |
Energy & Minerals [Member] | Rossing [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge | (9) | (267) |
Impairment charges, Non-controlling interests | 3 |  |
Impairment charge, net amount | $ (6) |  |
Copper & Diamonds [member] | Argyle Diamond Mine [member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge |  | $ (172) | (241)
Other operations [Member] |  |  |
Disclosure Of Impairment Loss Recognised Or Reversed [Line Items] |  |  |
Pre-tax impairment charge |  |  | $ (8)

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to impairment of goodwill. [Refer: Accounting profit; Goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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