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Acquisition and Disposition - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 28, 2021
Jan. 15, 2021
Feb. 29, 2020
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2019
Business Acquisition [Line Items]                
Gain on sale of Transtar         $ 506 $ 0 $ 0  
Restructuring and other charges       $ 89 128 138 $ 275  
Transtar, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Business Acquisition [Line Items]                
Ownership percentage 100.00%              
Disposal group, cash purchase price $ 627              
Gain on sale of Transtar         $ 506      
Customer relationships                
Business Acquisition [Line Items]                
Useful lives         22 years      
Big River Steel                
Business Acquisition [Line Items]                
Purchase price, net of cash acquired   $ 625            
Cash received in acquisition   36            
Restricted cash received in acquisition   62            
Liabilities incurred in business acquisition   50            
Transaction fees   9            
Ownership interest               49.90%
Fair value of previously held investment in Big River Steel   770            
Remeasurement gain   111            
Step-up to fair value for property, plant and equipment   308            
Step-up to fair value for debt   194            
Step-up to fair value for inventory   24            
Goodwill recorded   $ 916            
Risk adjusted rate   11.00%            
Terminal growth rate   2.00%            
Gain on previously held equity investment included in pro forma information           111    
Transaction fees and other related costs included in pro forma information           9    
Inventory step-up amortization included in pro forma information           24    
Non-recurring retention bonuses included in pro forma information           $ 44    
Accounts payable and accrued liabilities   $ 224            
Long-term debt   1,997            
Property, plant and equipment   2,188            
Big River Steel | Customer relationships                
Business Acquisition [Line Items]                
Intangible asset recorded   $ 413            
Amortization period for intangible asset   22 years            
UPI                
Business Acquisition [Line Items]                
Purchase price, net of cash acquired     $ 3          
Cash received in acquisition     $ 2          
Ownership interest     50.00%          
Fair value of previously held investment in Big River Steel     $ 5          
Remeasurement gain     25          
UPI accounts payable for substrate purchased from U. S. Steel     135          
Receivables     44          
Inventories     96          
Accounts payable and accrued liabilities     19          
Long-term debt     55          
Payroll and employee benefit liabilities     78          
Property, plant and equipment     97          
Step-up to fair value for property, plant and equipment     47          
Step-up to fair value for intangible asset for a beneficial energy contract     $ 54          
UPI | Energy Contract [Domain]                
Business Acquisition [Line Items]                
Useful lives     10 years