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Acquisitions and Dispositions - Dispositions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2018
USD ($)
Plant
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Disposition      
Loss on sale of U.S. steel food and steel aerosol packaging business $ 38    
US steel food and steel aerosol packaging | Disposal Group, Held-for-sale, Not Discontinued Operations      
Disposition      
Cash received in exchange for the sale of business $ 600    
Number of plants sold | Plant 9    
Ball Metalpack      
Disposition      
Percentage of ownership in a joint venture 49.00%    
Related party transactions      
Sale of metal to joint venture   $ 62 $ 62
Profit from sale of metal to joint venture   0 0
Accounts receivable from joint venture   $ 78 $ 78