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Plant Closures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Property, Plant and Equipment [Line Items]    
Prior Period Reclassification Adjustment   $ 13
Property, Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Dispositions 20 144
Property, Plant and Equipment, Disposals $ 5 $ 16
Depreciation expense $ 225 $ 341