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OTHER ASSETS (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Prepaid Expense and Other Assets [Abstract]    
Investments in company-owned life insurance policies $ 952 $ 773
Property and equipment, net 499 535
Lease ROU assets 446 321
Prepaid expenses 127 123
Investments in FHLB and FRB stock 72 77
All other 161 231
Total other assets 2,257 $ 2,060
Cumulative face value of company-owned life insurance policies $ 2,040