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Impairment charges net of reversals - Additional information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 16, 2020
Jul. 09, 2020
Jul. 16, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 03, 2021
Sep. 30, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Adjustments to carrying value           $ 518,000,000 $ 946,000,000      
Cash flows from consolidated operations [1]           $ 33,936,000,000 $ 21,822,000,000 $ 19,705,000,000    
Kitimat | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Cost of construction                 $ 336,000,000  
Discount rate applied to cash flow projections           6.60%        
Recoverable amount of asset or cash-generating unit           $ 3,126,000,000        
Carrying amount of asset or cash-generating unit           3,323,000,000        
Post-tax impairment charge           197,000,000        
Pre-tax impairment charge net of reversals           269,000,000        
Adjustments to carrying value           67,000,000        
Cash flows from consolidated operations           $ 58,000,000        
Sensitivity Analysis Discount Rate Applied To Cash Flow Projections           7.10%        
Sensitivity Analysis, Increase (Decrease) In Recoverable Amount Of Asset Or Cash-Generating Unit Due To A 50 Basis Point Increase           $ 180,000,000        
Oyu Tolgoi | Copper                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Discount rate applied to cash flow projections         8.30% 8.00%        
Recoverable amount of asset or cash-generating unit         $ 8,300,000,000 $ 11,800,000,000        
Pre-tax impairment charge net of reversals         2,200,000,000          
Sensitivity Analysis Discount Rate Applied To Cash Flow Projections           8.50%        
Sensitivity Analysis, Increase (Decrease) In Recoverable Amount Of Asset Or Cash-Generating Unit Due To A 50 Basis Point Increase           $ 800,000,000        
Recoverable amount of asset or cash generating unit, percent           20.00%        
Confidence level used to determine risk adjustment factor           10.00%        
Amount of increase in cash flows from used in consolidated operations under Paris aligned accounting           $ 1,900,000,000        
Deferred tax expense (income) relating to origination and reversal of temporary differences         320,000,000          
Deductible temporary differences for which no deferred tax asset is recognised         $ 359,000,000          
Property development and project management expense $ 6,750,000,000                  
Oyu Tolgoi | Copper | Bottom of range                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Production delay period     16 months              
Oyu Tolgoi | Copper | Top of range                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Production delay period     30 months              
Pacific Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Contract termination notice period   14 months                
Pacific Aluminium | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Discount rate applied to cash flow projections             6.60%      
Recoverable amount of asset or cash-generating unit             $ 273,000,000      
Post-tax impairment charge             26,000,000      
Pre-tax impairment charge net of reversals             36,000,000      
Pacific Aluminum Smelter | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Post-tax impairment charge             119,000,000      
Pre-tax impairment charge net of reversals             $ 148,000,000      
Sohar | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Discount rate applied to cash flow projections                   7.60%
Recoverable amount of asset or cash-generating unit                   $ 258,000,000
ISAL | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Percentage of output reduction due to workforce strike           25.00%        
Discount rate applied to cash flow projections             6.60%      
Recoverable amount of asset or cash-generating unit             $ 139,000,000      
Pre-tax impairment charge net of reversals       $ 204,000,000     93,000,000 109,000,000    
Reversal of impairment loss recognised in profit or loss             $ 111,000,000      
Diavik | Copper                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Proportion of ownership interest in joint venture (%)             60.00%      
Yarwun Alumina Refinery | Aluminium                    
Disclosure of impairment loss and reversal of impairment loss [line items]                    
Pre-tax impairment charge net of reversals               $ 1,138,000,000    
Impairment loss, annual reduction, percent               30.00%    
Sensitivity Analysis, Reduced Spot Price               $ 275    
[1]
(a) Cash flows from consolidated operations——
Profit after tax for the year22,575 10,400 6,972 
Adjustments for:
– Taxation8,258 4,991 4,147 
– Finance items26 1,751 648 
– Share of profit after tax of equity accounted units(1,042)(652)(301)
– Losses on disposal of interest in business36— — 291 
– Impairment charges of investments in equity accounted units after tax6— 339 — 
– Impairment charges net of reversals6269 904 3,487 
– Depreciation and amortisation4,697 4,279 4,384 
– Provisions (including exchange differences on provisions)1,903 894 753 
– Pension settlement25(291)— — 
Utilisation of provisions(771)(582)(539)
Utilisation of provision for post-retirement benefits25(129)(192)(205)
Change in inventories(1,397)(281)28 
Change in receivables and other assets(g)
(367)(562)163 
Change in trade and other payables685 558 (191)
Other items(h)
(480)(25)68 
33,936 21,822 19,705