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Commitments and Contingent Liabilities - Schedule of Components of Environmental Remediation Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Environmental Remediation [Line Items]    
Accrued environmental remediation $ 398 $ 406
Chambers Works, Deepwater, New Jersey [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 19 20
East Chicago, Indiana [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 14 17
Fayetteville Works, Fayetteville, North Carolina [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 199 201
Pompton Lakes, New Jersey [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 42 43
USS Lead, East Chicago, Indiana [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation 13 13
All other sites [Member]    
Environmental Remediation [Line Items]    
Accrued environmental remediation $ 111 $ 112