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Operating segments - additional information - Consolidated sales revenue by product (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of products and services [line items]      
Revenue from contracts with customers $ 43,492 $ 42,987 $ 40,594
Other revenue 1,119 178 (72)
Consolidated sales revenue 44,611 43,165 40,522
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales      
Disclosure of products and services [line items]      
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales 2,407 2,202 2,313
Gross product sales      
Disclosure of products and services [line items]      
Consolidated sales revenue 47,018 45,367 42,835
Iron Ore      
Disclosure of products and services [line items]      
Revenue from contracts with customers 28,202 25,516 19,888
Other revenue 1,000 229 (21)
Consolidated sales revenue 29,202 25,745 19,867
Aluminium, Alumina and Bauxite      
Disclosure of products and services [line items]      
Revenue from contracts with customers 9,092 10,207 12,041
Other revenue 54 (32) (22)
Consolidated sales revenue 9,146 10,175 12,019
Copper      
Disclosure of products and services [line items]      
Revenue from contracts with customers 1,721 2,030 2,420
Other revenue 64 (7) (32)
Consolidated sales revenue 1,785 2,023 2,388
Coal      
Disclosure of products and services [line items]      
Revenue from contracts with customers   0 986
Other revenue   0 3
Consolidated sales revenue   0 989
Industrial minerals      
Disclosure of products and services [line items]      
Revenue from contracts with customers 2,054 2,251 2,168
Other revenue (3) (12) 0
Consolidated sales revenue 2,051 2,239 2,168
Gold      
Disclosure of products and services [line items]      
Revenue from contracts with customers 471 667 869
Other revenue 6 2 0
Consolidated sales revenue 477 669 869
Diamonds      
Disclosure of products and services [line items]      
Revenue from contracts with customers 459 619 695
Other revenue 0 0 0
Consolidated sales revenue 459 619 695
Uranium      
Disclosure of products and services [line items]      
Revenue from contracts with customers 299 375 415
Other revenue 0 0 0
Consolidated sales revenue 299 375 415
Other      
Disclosure of products and services [line items]      
Revenue from contracts with customers 1,194 1,322 1,112
Other revenue (2) (2) 0
Consolidated sales revenue $ 1,192 $ 1,320 $ 1,112