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Pension and Other Postretirement Benefits - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 01, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Employee
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Company's contribution $ 500        
Minimum required cash contribution to pension plans reminder of 2021   $ 80   $ 80  
United States [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Minimum required cash contribution to pension plans   54   49 $ 40
Non-U.S. [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Minimum required cash contribution to pension plans   6   20 $ 19
Warrick Rolling Mill [Member] | Held for Sale [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Sale transaction value of waste processing     $ 670    
Assumption of other postretirement benefit liabilities   66   66  
Decrease in other postretirement benefit liabilities after post closing adjustment   6      
Number of employees | Employee     1,150    
Action# 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Decrease to accrued other postretirement benefits liability       106  
Curtailment gain       17  
Settlement charge       26  
Action# 1 [Member] | Warrick Rolling Mill [Member] | Held for Sale [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Sale transaction value of waste processing     $ 670    
Assumption of other postretirement benefit liabilities   66   66  
Decrease in other postretirement benefit liabilities after post closing adjustment   6      
Number of employees | Employee     1,150    
Decrease to accrued other postretirement benefits liability     $ 40    
Remeasurement to accrued other postretirement benefits liability       66  
Curtailment gain     17    
Settlement charge     $ 26    
Action# 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Settlement charge       39  
Decrease to accrued other pension benefits liability       $ 90  
Action# 2 [Member] | Warrick Rolling Mill [Member] | Held for Sale [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Settlement charge   39      
Decrease to accrued other pension benefits liability   $ 90