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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ (6,283) $ (1,978) $ (3,766)
Other comprehensive income, net of tax, attributable to TD Group 32 56 169
Ending balance (9,679) (6,283) (1,978)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax 8 (37) 6
Pension Liability Adjustments, Net 0   0
Cash Flow Hedging | Designated as Hedging Instrument | Net Sales      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Derivative, Gain (Loss) on Derivative, Net (1) (3)  
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit) (1) (1)  
Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense, Net      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Derivative, Gain (Loss) on Derivative, Net 57 106  
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit) (18) (33)  
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (42) (98) (267)
Other comprehensive income, net of tax, attributable to TD Group 32 56  
Ending balance (10) (42) (98)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 19 143  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (23) (124)  
Ending balance (4) 19 143
Defined benefit pension plan activity (3)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1 2  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (3) (1)  
Ending balance (2) 1 2
Currency translation adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (62) (243)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 58 181  
Ending balance $ (4) $ (62) $ (243)