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OTHER BORROWINGS, Schedule of Other Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Other Borrowings [Abstract]    
Total other borrowings $ 858 $ 888
Mortgage notes payable    
Other Borrowings [Abstract]    
Mortgage notes payable 8 13
FHLB advances    
Other Borrowings [Abstract]    
FHLB advances $ 850 $ 875