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ACQUISITIONS (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
GreensLedge Holdings LLC and Clark Capital    
Business Combination [Line Items]    
Contingent consideration liability, maximum $ 275 $ 275
Contingent consideration liability, fair value $ 180 180
GreensLedge Holdings LLC and Clark Capital | Minimum    
Business Combination [Line Items]    
Contingent consideration liability, term 5 years  
GreensLedge Holdings LLC and Clark Capital | Maximum    
Business Combination [Line Items]    
Contingent consideration liability, term 7 years  
GreensLedge Holdings LLC    
Business Combination [Line Items]    
Goodwill $ 131 131
Identifiable intangible assets 31 $ 31
Identifiable intangible assets, weighted-average useful life   7 years
Clark Capital    
Business Combination [Line Items]    
Goodwill 305 $ 305
Identifiable intangible assets $ 330 330
Identifiable intangible assets, weighted-average useful life 16 years  
Non-amortizing identifiable intangible assets $ 32 $ 32