v3.26.1
BANK LOANS, NET, Held for Investment Residential Mortgage Loan Portfolio by FICO Score and by LTV Ratio (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Total loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans held for investment $ 55,075 $ 51,603
Residential mortgage loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,066 1,810
Fiscal year before current fiscal year 1,729 1,206
Fiscal year two years before current fiscal year 1,114 1,465
Fiscal year three years before current fiscal year 1,369 2,518
Fiscal year four years before current fiscal year 2,427 1,390
Prior 3,046 1,864
Revolving loans 38 42
Total loans held for investment 10,789 10,295
Residential mortgage loans | Total loans held for investment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,066 1,810
Fiscal year before current fiscal year 1,729 1,206
Fiscal year two years before current fiscal year 1,114 1,465
Fiscal year three years before current fiscal year 1,369 2,518
Fiscal year four years before current fiscal year 2,427 1,390
Prior 3,046 1,864
Revolving loans 38 42
Total loans held for investment 10,789 10,295
Residential mortgage loans | Total loans held for investment | Below 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 708 1,271
Fiscal year before current fiscal year 1,212 874
Fiscal year two years before current fiscal year 804 1,037
Fiscal year three years before current fiscal year 968 1,926
Fiscal year four years before current fiscal year 1,864 1,100
Prior 2,364 1,432
Revolving loans 37 41
Total loans held for investment 7,957 7,681
Residential mortgage loans | Total loans held for investment | 80%+    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 358 539
Fiscal year before current fiscal year 517 332
Fiscal year two years before current fiscal year 310 428
Fiscal year three years before current fiscal year 401 592
Fiscal year four years before current fiscal year 563 290
Prior 682 432
Revolving loans 1 1
Total loans held for investment 2,832 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 5 5
Fiscal year two years before current fiscal year 4 11
Fiscal year three years before current fiscal year 11 17
Fiscal year four years before current fiscal year 16 7
Prior 24 18
Revolving loans 0 0
Total loans held for investment 62 63
Residential mortgage loans | Total loans held for investment | 600 - 699    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 64 74
Fiscal year before current fiscal year 74 60
Fiscal year two years before current fiscal year 57 66
Fiscal year three years before current fiscal year 60 96
Fiscal year four years before current fiscal year 90 43
Prior 120 90
Revolving loans 3 5
Total loans held for investment 468 434
Residential mortgage loans | Total loans held for investment | 700 - 799    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 791 1,424
Fiscal year before current fiscal year 1,364 747
Fiscal year two years before current fiscal year 698 815
Fiscal year three years before current fiscal year 762 1,419
Fiscal year four years before current fiscal year 1,366 744
Prior 1,657 1,026
Revolving loans 28 29
Total loans held for investment 6,666 6,204
Residential mortgage loans | Total loans held for investment | 800 +    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 208 306
Fiscal year before current fiscal year 286 392
Fiscal year two years before current fiscal year 353 572
Fiscal year three years before current fiscal year 536 986
Fiscal year four years before current fiscal year 955 594
Prior 1,242 727
Revolving loans 7 8
Total loans held for investment 3,587 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