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Property, Plant And Equipment (Tables)
6 Months Ended
Mar. 31, 2018
Property, Plant and Equipment, Net [Abstract]  
Property, Plant And Equipment And Accumulated Depreciation
The major categories of property, plant and equipment and accumulated depreciation are as follows (in millions): 

March 31, 2018
 
September 30, 2017
Land
$
141

 
$
138

Buildings and leasehold improvements
4,010

 
3,878

Machinery and equipment
7,284

 
7,111

Land improvements and other
343

 
323

Buildings and equipment under construction
618

 
492

 
12,396

 
11,942

Less accumulated depreciation
6,641

 
6,374

Net property, plant and equipment
$
5,755

 
$
5,568