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Plant Closures (Details) - Property, Plant and Equipment [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Dispositions 4 155
Property, Plant and Equipment, Disposals $ 19  
Depreciation expense $ 225 $ 791