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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)