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Summary Of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Summary Of Accounting Policies [Line Items]        
Retained earnings $ 24,199 $ 23,072    
Finished products 578 592    
Raw materials and work in process 1,302 1,221    
Total inventories 1,880 1,813    
Land 336 316    
Buildings 2,219 2,145    
Machinery and equipment 5,645 5,470    
Construction in progress 471 439    
Property, plant and equipment, at cost 8,671 8,370    
Less: Accumulated depreciation 5,029 4,808    
Property, plant and equipment, net $ 3,642 3,562    
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 8      
Undistributed earnings of non-U.S. subsidiaries $ 4,000      
Minimum [Member]        
Summary Of Accounting Policies [Line Items]        
Warranty period (in years) 1 year      
Maximum [Member]        
Summary Of Accounting Policies [Line Items]        
Warranty period (in years) 2 years      
Percentage of product warranty expenses of sales 1.00%      
Percentage of revenue from percentage-of-completion accounting method 5.00%      
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 $ 30 103 $ 0  
Accounting Standards Update 2017-07 [Member]        
Summary Of Accounting Policies [Line Items]        
Effect of change in accounting principal on operating results, retirement benefits   40 $ (38)  
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    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Summary Of Accounting Policies [Line Items]        
Retained earnings       $ 30