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Restructuring and Related Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | $ 51 | $ 103 | $ 146 | $ 377
Current Restructuring Plans |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | 49 |  | 122 |
Current Restructuring Plans | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | 13 |  | 41 |
Americas | Current Restructuring Plans | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | 13 |  | 33 |
EMEA | Current Restructuring Plans | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | 22 |  | 40 |
APAC | Current Restructuring Plans | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs and asset impairment charges | $ 1 |  | $ 8 |

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