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Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period $ 2,028 $ 2,024 $ 2,006
Additions (disposals), net [1] 4 81 157
Impairment losses (note 2) (194)   (9)
Business combinations (note 5.1) 7    
Reclassifications (notes 5.2 and 13)   (2) (11)
Amortization for the period (130) (124) (106)
Foreign currency translation effects 31 49 (13)
Balance at the end of period 1,746 2,028 2,024
Extraction rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 1,590 1,622  
Additions (disposals), net [1] (33) (26)  
Impairment losses (note 2) (181)    
Amortization for the period (21) (8)  
Foreign currency translation effects 3 2  
Balance at the end of period 1,358 1,590 1,622
Industrial property and trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 24 24  
Additions (disposals), net [1]   (6)  
Business combinations (note 5.1) 2    
Amortization for the period (2) (1)  
Foreign currency translation effects 0 7  
Balance at the end of period 24 24 24
Mining projects [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 43 37  
Additions (disposals), net [1]   5  
Amortization for the period (1) (1)  
Foreign currency translation effects 1 2  
Balance at the end of period 43 43 37
Others intangible assets [Member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period [1] 371 341  
Additions (disposals), net [1] 37 108  
Impairment losses (note 2) [1] (13)    
Business combinations (note 5.1) [1] 5    
Reclassifications (notes 5.2 and 13) [1]   (2)  
Amortization for the period [1] (106) (114)  
Foreign currency translation effects [1] 27 38  
Balance at the end of period [1] $ 321 $ 371 $ 341
[1] In 2020 and 2019, “Others” includes the carrying amount of internal-use software of $213 and $253, respectively. Capitalized direct costs incurred in the development stage of internal-use software, such as professional fees, direct labor and related travel expenses amounted to $40 in 2020, $102 in 2019 and $133 in 2018.