GOODWILL AND OTHER INTANGIBLES - Schedule Of Gross Carrying Amount And Accumulated Amortization Of Identifiable Intangible Assets By Major Class (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 15,832	$ 15,628
Less: Accumulated amortization	6,374	5,192
Net carrying amount	9,458	10,436
Customer Relationships
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	8,180	8,114
Less: Accumulated amortization	2,379	1,818
Net carrying amount	5,801	6,296
Intellectual Property
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	6,069	6,017
Less: Accumulated amortization	2,658	2,116
Net carrying amount	3,411	3,901
Capitalized Software
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,583	1,497
Less: Accumulated amortization	1,337	1,258
Net carrying amount	$ 246	$ 239