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Guarantees (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Guarantor Obligations [Line Items]      
Insurance Settlements Receivable, Current $ 6 $ 31  
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities 1 year    
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities 1 year    
Post sale contingent tax indemnification liabilities $ 255 290 $ 290
Warranties transferred to liabilities held for sale   13  
Insurance Settlements Receivable, Noncurrent 20 15  
Movement in Standard Product Warranty Accrual [Roll Forward]      
Balance at beginning of period 409 374  
Accruals for warranties issued during the period 309 312  
Accruals from acquisitions and divestitures (1) [1] 0 7  
Accruals related to pre-existing warranties (including changes in estimates) (26) (4)  
Settlements made (in cash or in kind) during the period (297) (280)  
Currency translation (3) 0  
Balance at end of period 392 $ 409  
Business Divestitures, Not Specific      
Guarantor Obligations [Line Items]      
Post sale contingent tax indemnification liabilities $ 235    
[1] The year ended September 30, 2017 includes $13 million of product warranties transferred to liabilities held for sale on the consolidated statements of financial position. Refer to Note 4, "Discontinued Operations," of the notes to consolidated financial statements for further information regarding the Company's disposal groups classified as held for sale.