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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, 2026
Sep. 30, 2025
Total loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans held for investment $ 56,491 $ 51,603
Residential mortgage loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,802 1,810
Fiscal year before current fiscal year 1,677 1,206
Fiscal year two years before current fiscal year 1,073 1,465
Fiscal year three years before current fiscal year 1,318 2,518
Fiscal year four years before current fiscal year 2,373 1,390
Prior 2,940 1,864
Revolving loans 40 42
Total loans held for investment 11,223 10,295
Residential mortgage loans | Total loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,802 1,810
Fiscal year before current fiscal year 1,677 1,206
Fiscal year two years before current fiscal year 1,073 1,465
Fiscal year three years before current fiscal year 1,318 2,518
Fiscal year four years before current fiscal year 2,373 1,390
Prior 2,940 1,864
Revolving loans 40 42
Total loans held for investment 11,223 10,295
Residential mortgage loans | Total loans held for investment | Below 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,178 1,271
Fiscal year before current fiscal year 1,178 874
Fiscal year two years before current fiscal year 775 1,037
Fiscal year three years before current fiscal year 930 1,926
Fiscal year four years before current fiscal year 1,823 1,100
Prior 2,280 1,432
Revolving loans 40 41
Total loans held for investment 8,204 7,681
Residential mortgage loans | Total loans held for investment | 80%+    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 624 539
Fiscal year before current fiscal year 499 332
Fiscal year two years before current fiscal year 298 428
Fiscal year three years before current fiscal year 388 592
Fiscal year four years before current fiscal year 550 290
Prior 660 432
Revolving loans 0 1
Total loans held for investment 3,019 2,614
Residential mortgage loans | Total loans held for investment | Below 600    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 2 5
Fiscal year before current fiscal year 4 5
Fiscal year two years before current fiscal year 10 11
Fiscal year three years before current fiscal year 9 17
Fiscal year four years before current fiscal year 16 7
Prior 25 18
Revolving loans 0 0
Total loans held for investment 66 63
Residential mortgage loans | Total loans held for investment | 600 - 699    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 77 74
Fiscal year before current fiscal year 61 60
Fiscal year two years before current fiscal year 44 66
Fiscal year three years before current fiscal year 67 96
Fiscal year four years before current fiscal year 111 43
Prior 116 90
Revolving loans 7 5
Total loans held for investment 483 434
Residential mortgage loans | Total loans held for investment | 700 - 799    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,412 1,424
Fiscal year before current fiscal year 982 747
Fiscal year two years before current fiscal year 636 815
Fiscal year three years before current fiscal year 721 1,419
Fiscal year four years before current fiscal year 1,293 744
Prior 1,585 1,026
Revolving loans 27 29
Total loans held for investment 6,656 6,204
Residential mortgage loans | Total loans held for investment | 800 +    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 310 306
Fiscal year before current fiscal year 630 392
Fiscal year two years before current fiscal year 381 572
Fiscal year three years before current fiscal year 521 986
Fiscal year four years before current fiscal year 953 594
Prior 1,211 727
Revolving loans 6 8
Total loans held for investment 4,012 3,585
Residential mortgage loans | Total loans held for investment | FICO score not available    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1 1
Fiscal year before current fiscal year 0 2
Fiscal year two years before current fiscal year 2 1
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 2
Prior 3 3
Revolving loans 0 0
Total loans held for investment $ 6 $ 9