BANK LOANS, NET, Credit Quality of Held for Investment Loan Portfolio (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held for investment	$ 28,211	$ 25,314
C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	415	999
Year two	1,173	1,273
Year three	1,359	1,260
Year four	1,236	1,492
Year five	1,441	961
Prior	2,386	1,715
Revolving loans	1,057	740
Total loans held for investment	9,067	8,440
C&I loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	415	999
Year two	1,173	1,273
Year three	1,326	1,180
Year four	1,159	1,408
Year five	1,391	935
Prior	2,317	1,633
Revolving loans	1,050	739
Total loans held for investment	8,831	8,167
C&I loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	30	41
Year four	39	0
Year five	0	26
Prior	69	54
Revolving loans	7	1
Total loans held for investment	145	122
C&I loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	3	24
Year four	24	84
Year five	41	0
Prior	0	28
Revolving loans	0	0
Total loans held for investment	68	136
C&I loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	15
Year four	14	0
Year five	9	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	23	15
CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	616	533
Year two	578	504
Year three	427	532
Year four	471	786
Year five	765	231
Prior	383	224
Revolving loans	81	62
Total loans held for investment	3,321	2,872
CRE loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	616	533
Year two	578	459
Year three	382	442
Year four	399	652
Year five	649	223
Prior	340	174
Revolving loans	81	62
Total loans held for investment	3,045	2,545
CRE loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	45
Year three	45	58
Year four	27	36
Year five	36	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	108	139
CRE loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	32
Year four	45	98
Year five	80	8
Prior	43	50
Revolving loans	0	0
Total loans held for investment	168	188
CRE loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
REIT loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	94	235
Year two	238	95
Year three	103	109
Year four	95	71
Year five	36	83
Prior	282	273
Revolving loans	560	246
Total loans held for investment	1,408	1,112
REIT loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	94	235
Year two	238	95
Year three	103	75
Year four	61	60
Year five	25	46
Prior	140	167
Revolving loans	553	237
Total loans held for investment	1,214	915
REIT loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	13
Year four	13	11
Year five	11	33
Prior	138	106
Revolving loans	5	6
Total loans held for investment	167	169
REIT loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	21
Year four	21	0
Year five	0	4
Prior	4	0
Revolving loans	2	3
Total loans held for investment	27	28
REIT loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
Tax-exempt loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	158
Year two	170	57
Year three	58	124
Year four	117	204
Year five	197	272
Prior	745	506
Revolving loans	0	0
Total loans held for investment	1,287	1,321
Tax-exempt loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	158
Year two	170	57
Year three	58	124
Year four	117	204
Year five	197	272
Prior	745	506
Revolving loans	0	0
Total loans held for investment	1,287	1,321
Tax-exempt loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
Tax-exempt loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
Tax-exempt loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,250	1,861
Year two	1,767	1,266
Year three	1,105	640
Year four	518	387
Year five	322	453
Prior	964	691
Revolving loans	19	20
Total loans held for investment	5,945	5,318
Residential mortgage loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,250	1,861
Year two	1,766	1,266
Year three	1,105	640
Year four	516	386
Year five	321	451
Prior	939	666
Revolving loans	19	20
Total loans held for investment	5,916	5,290
Residential mortgage loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	1	0
Year three	0	0
Year four	2	0
Year five	0	0
Prior	4	5
Revolving loans	0	0
Total loans held for investment	7	5
Residential mortgage loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	1
Year five	1	2
Prior	21	20
Revolving loans	0	0
Total loans held for investment	22	23
Residential mortgage loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
SBL and other
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5	3
Year two	11	45
Year three	24	12
Year four	12	0
Year five	0	0
Prior	0	0
Revolving loans	6,852	6,046
Total loans held for investment	6,904	6,106
SBL and other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5	3
Year two	11	45
Year three	24	12
Year four	12	0
Year five	0	0
Prior	0	0
Revolving loans	6,852	6,046
Total loans held for investment	6,904	6,106
SBL and other \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
SBL and other \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	0	0
SBL and other \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	$ 0	$ 0

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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