Other Financial Information (Intangibles) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 9,767	$ 9,671
Less: Accumulated amortization	3,307	3,099
Net carrying amount	6,460	6,572
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	3,399	3,436
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 2,860	$ 2,934