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Events after the balance sheet date (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 25, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items]        
Change in equity interest held by Rio Tinto [1]   $ 0 $ 0 $ 0
Equity issued to holders of non-controlling interests   66 129 101
Retained earnings        
Disclosure of non-adjusting events after reporting period [line items]        
Change in equity interest held by Rio Tinto $ (490) 76 [1] 84 [1] 85 [1]
Equity issued to holders of non-controlling interests (711)      
Non-controlling interests        
Disclosure of non-adjusting events after reporting period [line items]        
Change in equity interest held by Rio Tinto 490 (76) [1] (84) [1] (85) [1]
Equity issued to holders of non-controlling interests 711 $ 66 $ 129 $ 101
Amended and restated shareholders agreement | Erdenes Oyu Tolgoi LLC        
Disclosure of non-adjusting events after reporting period [line items]        
Loan amount waived off 2,400      
Accrued interest $ 1,000      
[1] Includes accrual of interest on funding balances with holders of non-controlling interests in Oyu Tolgoi. Refer to note 1(xii) and note 32(l). On 25 January 2022, Turquoise Hill agreed to waive the full amount of funding balances and interest; refer to note 45.