BANK LOANS, NET, Held for Sale and Held for Investment (Details) $ in Millions	Mar. 31, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments \| segment	6
Loans held for investment:
Total loans held for investment	$ 22,002	$ 20,979
Net unearned income and deferred expenses	(13)	(12)
Total loans held for investment, net	21,989	20,967
Loans held for sale, net	123	142
Total loans held for sale and investment	22,112	21,109
Allowance for loan losses	(324)	(218)
Bank loans, net	$ 21,788	$ 20,891
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for sale, net (in hundredths)	1.00%	1.00%
Total loans held for sale and investment (in hundredths)	100.00%	100.00%
C&I loans
Loans held for investment:
Total loans held for investment	$ 8,316	$ 8,098
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	38.00%	38.00%
CRE construction loans
Loans held for investment:
Total loans held for investment	$ 180	$ 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:
Total loans held for investment	$ 3,830	$ 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:
Total loans held for investment	$ 1,266	$ 1,241
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	5.00%	6.00%
Residential mortgage loans
Loans held for investment:
Total loans held for investment	$ 4,864	$ 4,454
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	22.00%	21.00%
SBL and other
Loans held for investment:
Total loans held for investment	$ 3,546	$ 3,349
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	16.00%	16.00%

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

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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