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Summary Of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Summary Of Accounting Policies [Line Items]      
Investments in publicly traded companies carried at fair value if ownership is less than percent threshold 20.00%    
Investments in nonpublicly traded companies carried at cost if ownership is less than percent threshold 20.00%    
Finished products $ 592 $ 560  
Raw materials and work in process 1,221 1,136  
Total inventories 1,813 1,696  
Land 316 295  
Buildings 2,145 2,043  
Machinery and equipment 5,470 5,175  
Construction in progress 439 360  
Property, plant and equipment, at cost 8,370 7,873  
Less: Accumulated depreciation 4,808 4,552  
Property, plant and equipment, net $ 3,562 3,321  
Percentage of revenue from multiple deliverable arrangements 5.00%    
Collateral balance posted $ 0    
Collateral held from counterparties 0    
Collateral balance could have been required to post 11    
Undistributed earnings of non-U.S. subsidiaries $ 3,400    
Minimum [Member]      
Summary Of Accounting Policies [Line Items]      
Investments accounted for by the equity method if ownership percentage is less than/greater than percent threshold 20.00%    
Warranty period (in years) 1 year    
Maximum [Member]      
Summary Of Accounting Policies [Line Items]      
Investments accounted for by the equity method if ownership percentage is less than/greater than percent threshold 50.00%    
Warranty period (in years) 2 years    
Percentage of product warranty expenses of sales 1.00%    
Percentage of revenue from percentage-of-completion accounting method 10.00%    
General duration of hedge positions is equal to or less than (in years) 2 years    
Building [Member] | Minimum [Member]      
Summary Of Accounting Policies [Line Items]      
Property, plant and equipment, useful life 30 years    
Building [Member] | Maximum [Member]      
Summary Of Accounting Policies [Line Items]      
Property, plant and equipment, useful life 40 years    
Machinery and Equipment [Member] | Minimum [Member]      
Summary Of Accounting Policies [Line Items]      
Property, plant and equipment, useful life 8 years    
Machinery and Equipment [Member] | Maximum [Member]      
Summary Of Accounting Policies [Line Items]      
Property, plant and equipment, useful life 12 years    
Retained earnings      
Summary Of Accounting Policies [Line Items]      
Adoption of accounting standard updates $ 103 $ 0 $ 0
Accounting Standards Update 2016-16 [Member] | Retained earnings      
Summary Of Accounting Policies [Line Items]      
Adoption of accounting standard updates 3    
Accounting standards update 2018-02, early adoption [Member] | Reclassification out of accumulated other comprehensive income [Member] | Retained earnings      
Summary Of Accounting Policies [Line Items]      
Adoption of accounting standard updates $ 100