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Other Financial Information (Intangibles) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 5,897 $ 5,911
Less: Accumulated amortization 3,198 3,034
Net carrying amount 2,699 2,877
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net carrying amount $ 1,401 $ 1,495