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Finance income and finance costs - Summary of finance income and finance costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Material Income And Expense [Abstract]      
Finance income from equity accounted units (Rio Tinto share) $ 4 $ 6 $ 8
Other finance income (including bank deposits and other financial assets) 137 83 44
Total finance income 141 89 52
Interest on:      
– Financial liabilities at amortised cost and associated derivatives (819) (895) (972)
– Finance leases (3) (3) (4)
Fair value movements:      
– Bonds designated as hedged items in fair value hedges 28 89 (17)
– Derivatives designated as hedging instruments in fair value hedges (22) (89) (11)
Loss on early redemption of bonds (256) (324)  
Amounts capitalised 224 111 254
Total finance costs $ (848) $ (1,111) $ (750)