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Investments in equity accounted units (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Investments Accounted For Using Equity Method Explanatory [Abstract]  
Summary of investments in equity accounted units
Summary balance sheet (Rio Tinto share)

2019
US$m

2018
US$m

Rio Tinto's share of assets
 
 
– Non-current assets
5,820

6,000

– Current assets
831

887


6,651

6,887

Rio Tinto's share of liabilities
 
 
– Current liabilities
(675
)
(607
)
– Non-current liabilities
(2,005
)
(1,981
)

(2,680
)
(2,588
)
Rio Tinto's share of net assets
3,971

4,299