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Property, Plant And Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 12,396 $ 11,942
Less accumulated depreciation 6,641 6,374
Net property, plant and equipment 5,755 5,568
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 141 138
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,010 3,878
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 7,284 7,111
Land improvements and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 343 323
Buildings and equipment under construction    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 618 $ 492