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BANK LOANS, NET, Credit Quality of Held for Investment Loan Portfolio (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2026
Sep. 30, 2025
SBL    
Loans by origination fiscal year    
Current fiscal year $ 17 $ 21
Fiscal year before current fiscal year 11 62
Fiscal year two years before current fiscal year 43 30
Fiscal year three years before current fiscal year 31 20
Fiscal year four years before current fiscal year 24 29
Prior 70 43
Revolving loans 24,571 19,570
Total loans held for investment 24,767 19,775
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Gross charge-offs 0 0
SBL | Pass    
Loans by origination fiscal year    
Current fiscal year 17 21
Fiscal year before current fiscal year 11 62
Fiscal year two years before current fiscal year 43 30
Fiscal year three years before current fiscal year 31 20
Fiscal year four years before current fiscal year 24 29
Prior 70 43
Revolving loans 24,532 19,485
Total loans held for investment 24,728 19,690
SBL | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 39 85
Total loans held for investment 39 85
SBL | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
SBL | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
C&I loans    
Loans by origination fiscal year    
Current fiscal year 559 746
Fiscal year before current fiscal year 577 744
Fiscal year two years before current fiscal year 705 382
Fiscal year three years before current fiscal year 300 1,017
Fiscal year four years before current fiscal year 879 851
Prior 3,353 3,559
Revolving loans 3,667 3,478
Total loans held for investment 10,040 10,777
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 1 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 1 0
Prior 7 32
Revolving loans 0 1
Gross charge-offs 9 33
C&I loans | Pass    
Loans by origination fiscal year    
Current fiscal year 559 746
Fiscal year before current fiscal year 576 743
Fiscal year two years before current fiscal year 704 366
Fiscal year three years before current fiscal year 288 1,016
Fiscal year four years before current fiscal year 879 849
Prior 3,301 3,495
Revolving loans 3,658 3,455
Total loans held for investment 9,965 10,670
C&I loans | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 1 0
Fiscal year two years before current fiscal year 0 16
Fiscal year three years before current fiscal year 12 1
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 3
Total loans held for investment 13 20
C&I loans | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 1
Fiscal year two years before current fiscal year 1 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 2
Prior 32 64
Revolving loans 8 20
Total loans held for investment 41 87
C&I loans | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 20 0
Revolving loans 1 0
Total loans held for investment 21 0
CRE loans    
Loans by origination fiscal year    
Current fiscal year 870 1,333
Fiscal year before current fiscal year 1,486 789
Fiscal year two years before current fiscal year 553 1,075
Fiscal year three years before current fiscal year 877 1,874
Fiscal year four years before current fiscal year 1,400 599
Prior 1,684 1,558
Revolving loans 819 612
Total loans held for investment 7,689 7,840
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 19 0
Prior 3 11
Revolving loans 0 1
Gross charge-offs 22 12
CRE loans | Pass    
Loans by origination fiscal year    
Current fiscal year 870 1,333
Fiscal year before current fiscal year 1,486 789
Fiscal year two years before current fiscal year 527 1,023
Fiscal year three years before current fiscal year 773 1,698
Fiscal year four years before current fiscal year 1,227 599
Prior 1,534 1,473
Revolving loans 819 612
Total loans held for investment 7,236 7,527
CRE loans | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 4 25
Fiscal year three years before current fiscal year 54 90
Fiscal year four years before current fiscal year 90 0
Prior 0 7
Revolving loans 0 0
Total loans held for investment 148 122
CRE loans | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 22 27
Fiscal year three years before current fiscal year 50 86
Fiscal year four years before current fiscal year 83 0
Prior 127 55
Revolving loans 0 0
Total loans held for investment 282 168
CRE loans | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 23 23
Revolving loans 0 0
Total loans held for investment 23 23
REIT loans    
Loans by origination fiscal year    
Current fiscal year 231 289
Fiscal year before current fiscal year 304 128
Fiscal year two years before current fiscal year 68 177
Fiscal year three years before current fiscal year 109 59
Fiscal year four years before current fiscal year 58 226
Prior 284 241
Revolving loans 617 570
Total loans held for investment 1,671 1,690
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Gross charge-offs 0 0
REIT loans | Pass    
Loans by origination fiscal year    
Current fiscal year 231 289
Fiscal year before current fiscal year 304 128
Fiscal year two years before current fiscal year 68 158
Fiscal year three years before current fiscal year 109 59
Fiscal year four years before current fiscal year 58 113
Prior 284 241
Revolving loans 617 570
Total loans held for investment 1,671 1,558
REIT loans | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
REIT loans | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 19
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 113
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 132
REIT loans | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
Residential mortgage loans    
Loans by origination fiscal year    
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
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 1
Revolving loans 0 0
Gross charge-offs 0 1
Residential mortgage loans | Pass    
Loans by origination fiscal year    
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 1,072 1,465
Fiscal year three years before current fiscal year 1,316 2,511
Fiscal year four years before current fiscal year 2,365 1,389
Prior 2,925 1,849
Revolving loans 40 42
Total loans held for investment 11,197 10,272
Residential mortgage loans | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 1 0
Fiscal year three years before current fiscal year 1 1
Fiscal year four years before current fiscal year 4 1
Prior 5 3
Revolving loans 0 0
Total loans held for investment 11 5
Residential mortgage loans | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 1 6
Fiscal year four years before current fiscal year 4 0
Prior 10 12
Revolving loans 0 0
Total loans held for investment 15 18
Residential mortgage loans | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
Tax-exempt loans    
Loans by origination fiscal year    
Current fiscal year 55 49
Fiscal year before current fiscal year 49 62
Fiscal year two years before current fiscal year 0 57
Fiscal year three years before current fiscal year 57 215
Fiscal year four years before current fiscal year 185 144
Prior 755 699
Revolving loans 0 0
Total loans held for investment 1,101 1,226
Gross charge-offs    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Gross charge-offs 0 0
Tax-exempt loans | Pass    
Loans by origination fiscal year    
Current fiscal year 55 49
Fiscal year before current fiscal year 49 62
Fiscal year two years before current fiscal year 0 57
Fiscal year three years before current fiscal year 57 215
Fiscal year four years before current fiscal year 185 144
Prior 755 699
Revolving loans 0 0
Total loans held for investment 1,101 1,226
Tax-exempt loans | Special mention    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
Tax-exempt loans | Substandard    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment 0 0
Tax-exempt loans | Doubtful    
Loans by origination fiscal year    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Fiscal year two years before current fiscal year 0 0
Fiscal year three years before current fiscal year 0 0
Fiscal year four years before current fiscal year 0 0
Prior 0 0
Revolving loans 0 0
Total loans held for investment $ 0 $ 0