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Valuation and Qualifying Accounts Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounts Receivable - Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 173 [1] $ 173 [1] $ 169
Provision (income) charged to costs and expenses (3) 20 37
Accounts charged off, net of recoveries (65) (21) (21)
Acquisition (divestiture) of businesses 0 0 (10)
Currency translation 1 1 (2)
Other (including impact of adoption of ASU 2016-13) 4 0 0
Balance at end of period 110 173 [1] 173 [1]
Deferred Tax Assets - Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 5,518 5,068 5,088
Allowance provision for new operating and other loss carryforwards 505 624 195
Allowance provision (benefits) (170) (174) (215)
Balance at end of period $ 5,853 $ 5,518 $ 5,068
[1] (1) Allowance for doubtful accounts as of September 30, 2020 and 2019, prior to the adoption of ASU 2016-13.