BANK LOANS, NET, Analysis of Payment Status of Loans Held for Investment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Analysis of payment status of loans held for investment [Abstract]
Total loans held for investment	$ 22,335	$ 21,549
Performing nonaccrual loans	13	15
Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	3	0
Nonaccrual with allowance	9	5
Nonaccrual with no allowance	19	25
Current and accruing	22,095	21,409
Total loans held for investment	22,126	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	3	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	7,499
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	7,499	7,419
Total loans held for investment	7,499	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	2,664
Troubled debt restructuring	14	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	14	14
Current and accruing	2,650	2,475
Total loans held for investment	2,664	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	1,254
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	1,254	1,210
Total loans held for investment	1,254	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	1,237
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	1,237	1,259
Total loans held for investment	1,237	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	4,928
Residential mortgage loans \| Loans held for investment
Analysis of payment status of loans held for investment [Abstract]
Financing receivable past due	3	0
Nonaccrual with allowance	9	3
Nonaccrual with no allowance	5	11
Current and accruing	4,911	4,959
Total loans held for investment	4,928	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	3	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	4,544
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	4,544	4,087
Total loans held for investment	4,544	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	$ 15	$ 15

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