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OTHER ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Prepaid Expense and Other Assets [Abstract]    
Investments in company-owned life insurance policies $ 1,013 $ 952
Property and equipment, net 491 499
Lease right-of-use (“ROU”) asset 439 446
Prepaid expenses 134 127
Investments in FHLB and Federal Reserve Bank stock 72 72
All other 239 161
Total other assets $ 2,388 $ 2,257