BANK LOANS, NET, Analysis of Payment Status of Loans Held for Investment (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	$ 23,224	$ 21,549
Performing nonaccrual loans	15	15
Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	1	0
Nonaccrual with allowance	14	5
Nonaccrual with no allowance	17	25
Current and accruing	22,989	21,409
Total loans held for investment	23,021	21,439
30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	1	0
90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
C&I loans
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	7,816
C&I loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Nonaccrual with allowance	0	2
Nonaccrual with no allowance	0	0
Current and accruing	7,816	7,419
Total loans held for investment	7,816	7,421
C&I loans \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
C&I loans \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
CRE loans
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	2,710
Troubled debt restructuring	13	6
CRE loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	13	14
Current and accruing	2,697	2,475
Total loans held for investment	2,710	2,489
CRE loans \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
CRE loans \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
REIT loans
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	1,380
REIT loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Current and accruing	1,380	1,210
Total loans held for investment	1,380	1,210
REIT loans \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
REIT loans \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Tax-exempt loans
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	1,223
Tax-exempt loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Current and accruing	1,223	1,259
Total loans held for investment	1,223	1,259
Tax-exempt loans \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Tax-exempt loans \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Residential mortgage loans
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	5,001
Residential mortgage loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	1	0
Nonaccrual with allowance	14	3
Nonaccrual with no allowance	4	11
Current and accruing	4,982	4,959
Total loans held for investment	5,001	4,973
Residential mortgage loans \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	1	0
Residential mortgage loans \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
SBL and other
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	4,891
SBL and other \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Nonaccrual with allowance	0	0
Nonaccrual with no allowance	0	0
Current and accruing	4,891	4,087
Total loans held for investment	4,891	4,087
SBL and other \| 30-89 days and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
SBL and other \| 90 days or more and accruing \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	0	0
Residential Mortgage - First Mortgage Portfolio Segment
Analysis of payment status of loans held for investment [Abstract]
Troubled debt restructuring	$ 14	$ 15

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