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Goodwill and Intangible Assets, Net - Summary of Consolidated Goodwill, Intangible Assets and Deferred Charges (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill $ 10,252 $ 11,590
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 8,506 9,562
Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 1,358 1,590
Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 24 24
Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 43 43
Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 321 371
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 11,603 12,847
Cost [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 8,506 9,562
Cost [member] | Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 1,774 1,985
Cost [member] | Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 44 42
Cost [member] | Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 196 196
Cost [member] | Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 49 48
Cost [member] | Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 1,034 1,014
Accumulated Depreciation, amortization and Impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (1,351) (1,257)
Accumulated Depreciation, amortization and Impairment [member] | Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (416) (395)
Accumulated Depreciation, amortization and Impairment [member] | Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (20) (18)
Accumulated Depreciation, amortization and Impairment [member] | Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (196) (196)
Accumulated Depreciation, amortization and Impairment [member] | Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (6) (5)
Accumulated Depreciation, amortization and Impairment [member] | Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill $ (713) $ (643)