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Dividends - Summary of number of shares dividend distributed (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Final Dividends \| Rio Tinto plc
Disclosure of Dividends [Line Items]
Previous year final dividend number of shares (in shares)	1,246.4	1,265.0	1,334.8
Interim dividend number of shares (in shares)	1,246.5	1,256.4	1,308.4
Final Dividends \| Rio Tinto Limited
Disclosure of Dividends [Line Items]
Previous year final dividend number of shares (in shares)	371.2	371.2	412.4
Interim dividend number of shares (in shares)	371.2	371.2	412.4
Special Dividends \| Rio Tinto plc
Disclosure of Dividends [Line Items]
Previous year final dividend number of shares (in shares)		1,265.0
Interim dividend number of shares (in shares)		1,256.4
Special Dividends \| Rio Tinto Limited
Disclosure of Dividends [Line Items]
Previous year final dividend number of shares (in shares)		371.2
Interim dividend number of shares (in shares)		371.2