BANK LOANS, NET, Held for Sale and Held for Investment (Details) $ in Millions	Jun. 30, 2020 USD ($) portfolioSegment	Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments \| portfolioSegment	6
Loans held for investment:
Loans held for investment:	$ 21,483	$ 20,979
Net unearned income and deferred expenses	(12)	(12)
Total loans held for investment, net	21,471	20,967
Loans held for sale, net	86	142
Total loans held for sale and investment	21,557	21,109
Allowance for loan losses	(334)	(218)
Bank loans, net	$ 21,223	$ 20,891
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for sale, net (in hundredths)	0.00%	1.00%
Total loans held for sale and investment (in hundredths)	100.00%	100.00%
C&I loans
Loans held for investment:
Loans held for investment:	$ 7,731	$ 8,098
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	36.00%	38.00%
CRE construction loans
Loans held for investment:
Loans held for investment:	$ 219	$ 185
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	1.00%	1.00%
CRE loans
Loans held for investment:
Loans held for investment:	$ 3,695	$ 3,652
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	17.00%	17.00%
Tax-exempt loans
Loans held for investment:
Loans held for investment:	$ 1,290	$ 1,241
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	6.00%	6.00%
Residential mortgage loans
Loans held for investment:
Loans held for investment:	$ 4,917	$ 4,454
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	23.00%	21.00%
SBL and other
Loans held for investment:
Loans held for investment:	$ 3,631	$ 3,349
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	17.00%	16.00%

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Loans and Leases Held-for-sale, Net, Not Part of Disposal Group

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Loans and Leases Receivable, Percentage

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Number of segments in which the loan portfolio is segregated.

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Ratio of loans held for sale, net to total loans held for sale and investment as of the reporting date.

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Total percentage of loans held for sale and investment as of the reporting date.

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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for loan losses. Also includes the aggregate amount of loans receivable that will be sold to other entities, net of deferred income, but before deducting the allowance for loan losses.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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