BANK LOANS, NET, Credit Quality of Held for Investment Loan Portfolio (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held for investment	$ 26,440	$ 25,314
C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	293	999
Year two	1,042	1,273
Year three	1,316	1,260
Year four	1,186	1,492
Year five	1,421	961
Prior	2,353	1,715
Revolving loans	997	740
Total loans held for investment	8,608	8,440
C&I loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	293	999
Year two	1,042	1,273
Year three	1,316	1,180
Year four	1,108	1,408
Year five	1,382	935
Prior	2,260	1,633
Revolving loans	993	739
Total loans held for investment	8,394	8,167
C&I loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	41
Year four	40	0
Year five	0	26
Prior	76	54
Revolving loans	4	1
Total loans held for investment	120	122
C&I loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	24
Year four	24	84
Year five	39	0
Prior	17	28
Revolving loans	0	0
Total loans held for investment	80	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	0	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	14	15
CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	154	533
Year two	615	504
Year three	442	532
Year four	522	786
Year five	758	231
Prior	425	224
Revolving loans	76	62
Total loans held for investment	2,992	2,872
CRE loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	154	533
Year two	615	459
Year three	397	442
Year four	431	652
Year five	642	223
Prior	380	174
Revolving loans	76	62
Total loans held for investment	2,695	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	43	36
Year five	36	0
Prior	0	0
Revolving loans	0	0
Total loans held for investment	124	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	48	98
Year five	80	8
Prior	45	50
Revolving loans	0	0
Total loans held for investment	173	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	0	235
Year two	239	95
Year three	96	109
Year four	99	71
Year five	36	83
Prior	282	273
Revolving loans	437	246
Total loans held for investment	1,189	1,112
REIT loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	235
Year two	239	95
Year three	96	75
Year four	65	60
Year five	25	46
Prior	140	167
Revolving loans	429	237
Total loans held for investment	994	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	6	6
Total loans held for investment	168	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	158	57
Year three	57	124
Year four	118	204
Year five	200	272
Prior	757	506
Revolving loans	0	0
Total loans held for investment	1,290	1,321
Tax-exempt loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	158
Year two	158	57
Year three	57	124
Year four	118	204
Year five	200	272
Prior	757	506
Revolving loans	0	0
Total loans held for investment	1,290	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	562	1,861
Year two	1,822	1,266
Year three	1,182	640
Year four	583	387
Year five	349	453
Prior	1,050	691
Revolving loans	20	20
Total loans held for investment	5,568	5,318
Residential mortgage loans \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	562	1,861
Year two	1,822	1,266
Year three	1,182	640
Year four	581	386
Year five	349	451
Prior	1,023	666
Revolving loans	20	20
Total loans held for investment	5,539	5,290
Residential mortgage loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	2	0
Year five	0	0
Prior	5	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	0	2
Prior	22	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	0	3
Year two	6	45
Year three	45	12
Year four	12	0
Year five	0	0
Prior	0	0
Revolving loans	6,500	6,046
Total loans held for investment	6,563	6,106
SBL and other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	3
Year two	6	45
Year three	45	12
Year four	12	0
Year five	0	0
Prior	0	0
Revolving loans	6,500	6,046
Total loans held for investment	6,563	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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