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Group statement of changes in equity (Parenthetical) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement Of Changes In Equity [Abstract]    
Dividends per share: paid during the period $ 1.8 $ 1.25
Dividends per share: proposed in the announcement of the results for the period   $ 1.1
Share buyback $ 1,444 [1] $ 300 [2]
Own shares purchased from owners of Rio Tinto $ 1,501 $ 252
[1] Total amount of US$1,444 million includes own shares purchased from owners of Rio Tinto plc as per the cash flow statement of US$1,501 million adjusted for the movement in a financial liability recognised in respect of irrevocable contracts in place as at 30 June 2018 and 31 December 2017 to cover the share buy-back programme.
[2] Total amount of US$300 million includes own shares purchased from owners of Rio Tinto plc as per the cash flow statement of US$252 million and a financial liability recognised in respect of an irrevocable contract in place as at 30 June 2017 to cover the share buy-back programme.