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BANK LOANS, NET, Held for Investment Residential Mortgage Loan Portfolio by FICO Score and by LTV Ratio (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans held for investment $ 50,050 $ 46,267
Residential mortgage loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,252 1,373
Fiscal year before current fiscal year 1,246 1,637
Fiscal year two years before current fiscal year 1,509 2,734
Fiscal year three years before current fiscal year 2,585 1,494
Fiscal year four years before current fiscal year 1,413 858
Prior 1,932 1,277
Revolving loans 39 39
Total loans held for investment 9,976 9,412
Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,252 1,373
Fiscal year before current fiscal year 1,246 1,637
Fiscal year two years before current fiscal year 1,509 2,734
Fiscal year three years before current fiscal year 2,585 1,494
Fiscal year four years before current fiscal year 1,413 858
Prior 1,932 1,277
Revolving loans 39 39
Total loans held for investment 9,976 9,412
Below 80% | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 878 988
Fiscal year before current fiscal year 899 1,155
Fiscal year two years before current fiscal year 1,071 2,104
Fiscal year three years before current fiscal year 1,977 1,182
Fiscal year four years before current fiscal year 1,120 665
Prior 1,487 973
Revolving loans 38 38
Total loans held for investment 7,470 7,105
80%+ | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 374 385
Fiscal year before current fiscal year 347 482
Fiscal year two years before current fiscal year 438 630
Fiscal year three years before current fiscal year 608 312
Fiscal year four years before current fiscal year 293 193
Prior 445 304
Revolving loans 1 1
Total loans held for investment 2,506 2,307
Below 600 | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 4 1
Fiscal year before current fiscal year 5 7
Fiscal year two years before current fiscal year 11 13
Fiscal year three years before current fiscal year 17 5
Fiscal year four years before current fiscal year 7 3
Prior 19 14
Revolving loans 0 0
Total loans held for investment 63 43
600 - 699 | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 46 79
Fiscal year before current fiscal year 60 52
Fiscal year two years before current fiscal year 67 107
Fiscal year three years before current fiscal year 102 52
Fiscal year four years before current fiscal year 43 44
Prior 94 124
Revolving loans 4 5
Total loans held for investment 416 463
700 - 799 | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 991 1,093
Fiscal year before current fiscal year 765 992
Fiscal year two years before current fiscal year 846 1,564
Fiscal year three years before current fiscal year 1,465 793
Fiscal year four years before current fiscal year 759 469
Prior 1,058 636
Revolving loans 27 23
Total loans held for investment 5,911 5,570
800 + | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 211 197
Fiscal year before current fiscal year 414 584
Fiscal year two years before current fiscal year 585 1,050
Fiscal year three years before current fiscal year 1,001 642
Fiscal year four years before current fiscal year 602 341
Prior 758 499
Revolving loans 8 10
Total loans held for investment 3,579 3,323
FICO score not available | Residential mortgage loans | Loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 3
Fiscal year before current fiscal year 2 2
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 2
Fiscal year four years before current fiscal year 2 1
Prior 3 4
Revolving loans 0 1
Total loans held for investment $ 7 $ 13