Segment Data - Revenues to Unaffiliated Customers and Long-lived Assets Including Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 19,372	$ 18,870	$ 19,131
Long-Lived Assets	44,104	44,792	44,606
Corporate
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	418	442	465
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	11,113	10,722	10,371
Long-Lived Assets	35,732	36,617	35,896
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,244	4,043	4,548
Long-Lived Assets	5,317	5,126	5,778
Greater Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,913	3,047	3,069
Long-Lived Assets	1,521	1,528	1,607
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,102	1,058	1,142
Long-Lived Assets	$ 1,116	$ 1,079	$ 860