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AVAILABLE-FOR-SALE SECURITIES, Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Accrued interest excluded | $ $ 19   $ 19   $ 18
Accrued interest on available-for-sale securities, location Other receivables, net   Other receivables, net   Other receivables, net
Average expected duration, available for sale securities     3 years 9 months 18 days    
Proceeds from sales of available-for-sale securities | $ $ 40 $ 0 $ 40 $ 78  
Losses reclassified from AOCI | $ $ 0   $ 0 $ 2  
Agency MBS and agency CMOs          
Debt Securities, Available-for-sale [Line Items]          
Number of available-for-sale securities determined to be in an unrealized loss position | security 830   830    
Number of available-for-sale securities determined to be in an unrealized loss position continuously for less than 12 months | security 97   97    
Number of available-for-sale securities determined to be in an unrealized loss position continuously for 12 months or more | security 733   733