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The amount of reserve for unfunded lending commitments.

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

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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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BANK LOANS, NET, Allowance for Loan Losses, Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Recorded investment [Abstract]
Total loans held for investment	$ 21,452	$ 20,979	$ 19,578	$ 17,158	$ 15,235
Reserve for unfunded lending commitments [Abstract]
Reserve for unfunded lending commitments	12	9
C&I loans
Recorded investment [Abstract]
Total loans held for investment	7,450	8,098	7,786	7,386	7,470
CRE construction
Recorded investment [Abstract]
Total loans held for investment	177	185	151	113	123
CRE loans
Recorded investment [Abstract]
Total loans held for investment	3,534	3,652	3,624	3,106	2,554
Tax-exempt
Recorded investment [Abstract]
Total loans held for investment	1,259	1,241	1,227	1,018	741
SBL and other
Recorded investment [Abstract]
Total loans held for investment	4,085	3,349	3,033	$ 2,386	$ 1,905
Loans held for investment
Allowance for loan losses:
Individually evaluated for impairment	1	7
Collectively evaluated for impairment	353	211
Total allowance for loan losses	354	218	203
Recorded investment [Abstract]
Individually evaluated for impairment	41	55
Collectively evaluated for impairment	21,411	20,924
Total loans held for investment	21,452	20,979
Loans held for investment \| C&I loans
Allowance for loan losses:
Individually evaluated for impairment	0	6
Collectively evaluated for impairment	200	133
Total allowance for loan losses	200	139	123
Recorded investment [Abstract]
Individually evaluated for impairment	2	19
Collectively evaluated for impairment	7,448	8,079
Total loans held for investment	7,450	8,098
Loans held for investment \| CRE construction
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3	3
Total allowance for loan losses	3	3	3
Recorded investment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	177	185
Total loans held for investment	177	185
Loans held for investment \| CRE loans
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	114	46
Total allowance for loan losses	114	46	47
Recorded investment [Abstract]
Individually evaluated for impairment	14	8
Collectively evaluated for impairment	3,520	3,644
Total loans held for investment	3,534	3,652
Loans held for investment \| Tax-exempt
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	14	9
Total allowance for loan losses	14	9	9
Recorded investment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,259	1,241
Total loans held for investment	1,259	1,241
Loans held for investment \| Residential mortgage loans
Allowance for loan losses:
Individually evaluated for impairment	1	1
Collectively evaluated for impairment	17	15
Total allowance for loan losses	18	16	17
Recorded investment [Abstract]
Individually evaluated for impairment	25	28
Collectively evaluated for impairment	4,922	4,426
Total loans held for investment	4,947	4,454
Loans held for investment \| SBL and other
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	5	5
Total allowance for loan losses	5	5	$ 4
Recorded investment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,085	3,349
Total loans held for investment	$ 4,085	$ 3,349