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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total	$ 23,596	$ 22,952	$ 22,331
Americas
Disaggregation of Revenue [Line Items]
Total	15,831	15,606	14,529
EMEA
Disaggregation of Revenue [Line Items]
Total	4,968	4,620	4,491
APAC
Disaggregation of Revenue [Line Items]
Total	2,797	2,726	3,311
Products and systems
Disaggregation of Revenue [Line Items]
Total	16,124	15,967	15,789
Products and systems | Americas
Disaggregation of Revenue [Line Items]
Total	11,187	11,206
Products and systems | EMEA
Disaggregation of Revenue [Line Items]
Total	2,977	2,789
Products and systems | APAC
Disaggregation of Revenue [Line Items]
Total	1,960	1,972
Services
Disaggregation of Revenue [Line Items]
Total	7,472	6,985	$ 6,542
Services | Americas
Disaggregation of Revenue [Line Items]
Total	4,644	4,400
Services | EMEA
Disaggregation of Revenue [Line Items]
Total	1,991	1,831
Services | APAC
Disaggregation of Revenue [Line Items]
Total	$ 837	$ 754

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