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Investments in equity accounted units (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Investments Accounted For Using Equity Method Explanatory [Abstract]  
Summary of investments in equity accounted units

 

 

 

2017

 

 

2016

 

Summary balance sheet (Rio Tinto share)

US$m

 

US$m

 

Rio Tinto's share of assets

 

 

 

 

 

 

– Non-current assets

 

5,913

 

 

6,686

 

– Current assets

 

990

 

 

832

 

 

 

6,903

 

 

7,518

 

Rio Tinto's share of liabilities

 

 

 

 

 

 

– Current liabilities

 

(654

)

 

(612

)

– Non-current liabilities

 

(1,763

)

 

(1,887

)

 

 

(2,417

)

 

(2,499

)

Rio Tinto's share of net assets

 

4,486

 

 

5,019