BANK LOANS, NET, Summary of Impaired Loans (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Gross recorded investment [Abstract]
Impaired loans with allowance for loan losses, gross recorded investment	$ 10	$ 30
Impaired loans without allowance for loan losses, gross recorded investment	23	19
Total impaired loans, gross recorded investment	33	49
Unpaid principal balance [Abstract]
Impaired loans with allowance for loan losses, unpaid principal balance	12	33
Impaired loans without allowance for loan losses, unpaid principal balance	35	30
Total impaired loans, unpaid principal balance	47	63
Allowance for loan losses [Abstract]
Impaired loans with allowance for loan losses, allowance for losses	1	7
Loan and Lease Receivables, Impaired [Abstract]
Average impaired loan balance	35	49	$ 37
C&I loans
Gross recorded investment [Abstract]
Impaired loans with allowance for loan losses, gross recorded investment	2	19
Unpaid principal balance [Abstract]
Impaired loans with allowance for loan losses, unpaid principal balance	2	20
Allowance for loan losses [Abstract]
Impaired loans with allowance for loan losses, allowance for losses	0	6
Loan and Lease Receivables, Impaired [Abstract]
Impaired loan, troubled debt restructurings		19
Average impaired loan balance	8	19	4
CRE loans
Gross recorded investment [Abstract]
Impaired loans without allowance for loan losses, gross recorded investment	13	8
Unpaid principal balance [Abstract]
Impaired loans without allowance for loan losses, unpaid principal balance	21	13
Loan and Lease Receivables, Impaired [Abstract]
Impaired loan, troubled debt restructurings	6	8
Average impaired loan balance	7	5	0
Residential mortgage - first mortgage loans
Gross recorded investment [Abstract]
Impaired loans with allowance for loan losses, gross recorded investment	8	11
Impaired loans without allowance for loan losses, gross recorded investment	10	11
Unpaid principal balance [Abstract]
Impaired loans with allowance for loan losses, unpaid principal balance	10	13
Impaired loans without allowance for loan losses, unpaid principal balance	14	17
Allowance for loan losses [Abstract]
Impaired loans with allowance for loan losses, allowance for losses	1	1
Loan and Lease Receivables, Impaired [Abstract]
Impaired loan, troubled debt restructurings	15	18
Average impaired loan balance	$ 20	$ 25	$ 33

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Amount of financing receivable modified as troubled debt restructuring.

+ References

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-Publisher FASB
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-Topic 310
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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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