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Restructuring and Other Charges, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D) $ 125 $ 7  
Noncurrent portion of the reserve 36   $ 43
MRN [Member]      
Restructuring Cost and Reserve [Line Items]      
Asset impairment charges 58    
Legal Disputes Related to 2019 Divestiture [Member] | Avilés and La Coruña Facilities [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D) 77    
Estimated Contract Costs | Wenatchee Smelter [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D) $ (9)    
Severance and Exit Costs [Member] | Warrick Rolling Mill [Member]      
Restructuring Cost and Reserve [Line Items]      
Settlement and curtailment of certain other postretirement benefits   9  
Contract Termination [Member] | Wenatchee (Washington) and Intalco (Washington) [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D)   6  
Permanent Close [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D)   (12)  
Other Item Charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (D)   $ 4