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Valuation and Qualifying Accounts Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounts Receivable - Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 169 $ 172 $ 168
Provision charged to costs and expenses 37 14 25
Accounts charged off, net of recoveries (21) (17) (41)
Valuation Allowances and Reserves, Reserves of Business Acquired (Divested) (10) 0 18
Currency translation (2) 0 2
Balance at end of period 173 169 172
Deferred Tax Assets - Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 5,088 3,735 3,290
Acquisition (divestiture) of businesses 0 0 53
Allowance provision for new operating and other loss carryforwards 195 1,639 550
Allowance provision benefits (215) (286) (158)
Balance at end of period $ 5,068 $ 5,088 $ 3,735