Restructuring and Related Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	$ 80	$ 51	$ 224	$ 146
Current Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	45		118
Restructuring and related cost, cost incurred to date	282		282
Current Restructuring Plans \| Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	27		45
Restructuring and related cost, cost incurred to date	92		92
Americas \| Current Restructuring Plans \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	7		39
Restructuring and related cost, cost incurred to date	90		90
EMEA \| Current Restructuring Plans \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	10		28
Restructuring and related cost, cost incurred to date	77		77
APAC \| Current Restructuring Plans \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	1		6
Restructuring and related cost, cost incurred to date	$ 23		$ 23

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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