BANK LOANS, NET, Held for Sale and Held for Investment (Details) $ in Millions	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 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	$ 21,452	$ 20,979	$ 19,578	$ 17,158	$ 15,235
Net unearned income and deferred expenses	(13)	(12)	(21)	(31)	(41)
Total loans held for investment, net	21,439	20,967	19,557	17,127	15,194
Loans held for sale, net	110	142	164
Loans held for sale, net				70	214
Total loans held for sale and investment	21,549	21,109	19,721	17,197	15,408
Allowance for loan losses	(354)	(218)	(203)	(190)	(197)
Bank loans, net	$ 21,195	$ 20,891	$ 19,518	$ 17,007	$ 15,211
Associated percentage of each major loan category in loan portfolios [Abstract]
Total loans held for sale and investment (in hundredths)	100.00%	100.00%	100.00%	100.00%	100.00%
C&I loans
Loans held for investment:
Total loans held for investment	$ 7,450	$ 8,098	$ 7,786	$ 7,386	$ 7,470
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	34.00%	38.00%	40.00%	43.00%	48.00%
CRE construction loans
Loans held for investment:
Total loans held for investment	$ 177	$ 185	$ 151	$ 113	$ 123
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	1.00%	1.00%	1.00%	1.00%	1.00%
CRE loans
Loans held for investment:
Total loans held for investment	$ 3,534	$ 3,652	$ 3,624	$ 3,106	$ 2,554
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	16.00%	17.00%	18.00%	18.00%	17.00%
Tax-exempt loans
Loans held for investment:
Total loans held for investment	$ 1,259	$ 1,241	$ 1,227	$ 1,018	$ 741
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	6.00%	6.00%	6.00%	6.00%	5.00%
Residential mortgage loans
Loans held for investment:
Total loans held for investment	$ 4,947	$ 4,454	$ 3,757	$ 3,149	$ 2,442
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	23.00%	21.00%	19.00%	18.00%	16.00%
SBL and other
Loans held for investment:
Total loans held for investment	$ 4,085	$ 3,349	$ 3,033	$ 2,386	$ 1,905
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	19.00%	16.00%	15.00%	14.00%	12.00%
Loans held for sale, net
Associated percentage of each major loan category in loan portfolios [Abstract]
Loans held for investment (in hundredths)	1.00%	1.00%	1.00%	0.00%	1.00%

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Number of segments in which the loan portfolio is segregated.

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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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