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Income Taxes - Components of Provision for Income Taxes on Continuing Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Components of income (loss) from continuing operations before income taxes:      
U.S. $ (309) $ (406) $ (325)
Non-U.S. 2,278 1,928 1,438
Income from continuing operations before income taxes 1,969 1,522 1,113
Current      
U.S. federal (239) 330 (201)
U.S. state (12) 86 94
Non-U.S. 302 102 289
Total 51 518 182
Deferred      
U.S. federal 385 (299) (267)
U.S. state 79 (26) (25)
Non-U.S. (270) (82) (358)
Total 194 (407) (650)
Income tax provision (benefit) 245 111 (468)
Income taxes paid 606 704 294
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income taxes paid 606 $ 704 $ 294
Discontinued Operations, Disposed of by Sale | Residential and Light Commercial HVAC Business      
Deferred      
Income taxes paid 1,400    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income taxes paid $ 1,400