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Commitments and Contingent Liabilities - Schedule of Components of Environmental Remediation Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Environmental Remediation [Line Items]    
Accrued environmental remediation $ 406 $ 291
Chambers Works, Deepwater, New Jersey [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 20 18
East Chicago, Indiana [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 17 21
Fayetteville Works, Fayetteville, North Carolina [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 201 75
Pompton Lakes, New Jersey [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 43 45
USS Lead, East Chicago, Indiana [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 13 15
All other sites [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation $ 112 $ 117