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Contingencies and Commitments - Additional Information (Detail)
€ in Millions, Allowances in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Plaintiff
Claim_Group
Allowances
Sep. 30, 2019
EUR (€)
Plaintiff
Claim_Group
Allowances
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Plaintiff
Claim_Group
LegalMatter
Sep. 30, 2019
USD ($)
Sep. 30, 2019
Project
Sep. 30, 2019
Plaintiff
Sep. 30, 2019
Claim_Group
Sep. 30, 2019
LegalMatter
Sep. 30, 2019
Allowances
Dec. 31, 2017
Claim_Group
Dec. 31, 2016
Claim_Group
Dec. 31, 2015
Claim_Group
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities           $ 187,000,000 $ 176,000,000                
Accrued liabilities for post-closure site monitoring and other costs             22,000,000                
Accrued liability for administrative and legal costs             9,000,000                
Number of years of projected administrative and legal costs included in accrual     3 years 3 years                      
Capital expenditures     $ 40,000,000   $ 55,000,000                    
Final allocation for emissions allowances | Allowances     48 48                      
Emissions allowances purchased | Allowances                       12      
Cost of emissions allowances purchased     $ 144,000,000 € 132                      
Estimated Shortfall in Emissions Allowances | Allowances     12 12                      
Estimated capital expenditures of complying with BAT over 2017 to 2020 period     $ 150,000,000 € 138                      
Financial assurance guarantees, maximum             4,000,000                
Residual value of equipment             21,000,000                
Residual value liability             0                
Restricted cash           $ 40,000,000 20,000,000                
Contract commitments to acquire property, plant and equipment             977,000,000                
Maximum default payment on termination of agreement             117,000,000                
Total payment under take-or-pay contracts $ 167,000,000 $ 147,000,000 $ 493,000,000   $ 454,000,000                    
Minimum                              
Loss Contingencies [Line Items]                              
Projected percentage remediation costs may exceed accrued liabilities     15.00% 15.00%                      
Unconditional purchase obligation term     2 years 2 years                      
Maximum                              
Loss Contingencies [Line Items]                              
Projected percentage remediation costs may exceed accrued liabilities     30.00% 30.00%                      
Unconditional purchase obligation term     16 years 16 years                      
Asbestos Matters                              
Loss Contingencies [Line Items]                              
Active cases brought against U.S. Steel | LegalMatter           755         796        
Number of plaintiffs involved | Plaintiff     2,380 2,380   2,320                  
Number of claims pending in jurisdictions           2,320     1,540 2,380     3,315 3,340 3,315
Percentage of claims pending in jurisdictions 65.00%   65.00% 65.00%                      
Number of major groups | Claim_Group     3 3                      
Projects with Ongoing Study and Scope Development                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             2,000,000                
Environmental remediation projects | Project               6              
Projects with Ongoing Study and Scope Development | Minimum                              
Loss Contingencies [Line Items]                              
Environment exit costs, possible additional loss     $ 30,000,000                        
Projects with Ongoing Study and Scope Development | Maximum                              
Loss Contingencies [Line Items]                              
Environment exit costs, possible additional loss     $ 45,000,000                        
Significant Projects with Defined Scope                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             130,000,000                
Environmental remediation projects | Project               4              
Significant Projects with Defined Scope | Minimum                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             5,000,000                
Gary Works, Project with Defined Scope                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             25,000,000                
Geneva Project                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             50,000,000                
Cherryvale Zinc Site                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             10,000,000                
St Louis Estuary Project                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             45,000,000                
Other Projects with a Defined Scope                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             4,000,000                
Environmental remediation projects | Project               2              
Other Projects with a Defined Scope | Minimum                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             1,000,000                
Other Projects with a Defined Scope | Maximum                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             5,000,000                
Environmental Remediation Projects Less Than One Million                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             4,000,000                
Environmental Remediation Projects Less Than One Million | Maximum                              
Loss Contingencies [Line Items]                              
Accrued liabilities for remediation activities             1,000,000                
Surety Bonds                              
Loss Contingencies [Line Items]                              
Financial assurance guarantees, maximum             $ 161,000,000