v3.26.1
FAIR VALUE, Recurring and Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Assets at fair value on a recurring basis:    
Available-for-sale securities, fair value $ 6,402 $ 6,888
Total derivative assets 285 307
Netting adjustments (214) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 71 68
Liabilities at fair value on a recurring basis:    
Derivative liabilities 281 313
Netting adjustments (83) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 198 190
Recurring    
Assets at fair value on a recurring basis:    
Total debt securities 1,395 1,495
Equity securities 18 20
Brokered certificates of deposit 19 19
Other 2 4
Total trading assets 1,434 1,538
Available-for-sale securities, fair value 6,402 6,888
Netting adjustments (214) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 71 68
Total all other investments 288 285
Other assets – client-owned fractional shares 188 171
Total assets at fair value on a recurring basis 8,494 9,055
Other investments – private equity – measured at net asset value (“NAV”) 111 105
Liabilities at fair value on a recurring basis:    
Total debt securities 685 860
Equity securities 40 31
Other liabilities 1  
Total trading liabilities 726 891
Netting adjustments (83) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition   190
Other payables – repurchase liabilities related to client-owned fractional shares 188 171
Total liabilities at fair value on a recurring basis 1,112 1,252
Recurring | Interest rate    
Assets at fair value on a recurring basis:    
Netting adjustments (214) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 61 67
Liabilities at fair value on a recurring basis:    
Netting adjustments (83) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 198 186
Recurring | Foreign exchange    
Assets at fair value on a recurring basis:    
Netting adjustments 0  
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 10 1
Liabilities at fair value on a recurring basis:    
Net amounts presented on the Condensed Consolidated Statements of Financial Condition   2
Recurring | Other    
Liabilities at fair value on a recurring basis:    
Net amounts presented on the Condensed Consolidated Statements of Financial Condition   2
Recurring | Municipal and provincial obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 4 3
Recurring | Corporate obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 469 651
Recurring | Government and agency obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 212 164
Recurring | Agency MBS and CMOs    
Liabilities at fair value on a recurring basis:    
Total debt securities   42
Recurring | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 317 409
Recurring | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 595 670
Recurring | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 127 149
Total all other investments 86 92
Recurring | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 214 231
Recurring | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 142 36
Recurring | Other    
Assets at fair value on a recurring basis:    
Total all other investments 202 193
Recurring | Assets at Fair Value on a Recurring Basis, Before Investments Measured at NAV    
Assets at fair value on a recurring basis:    
Total assets at fair value on a recurring basis 8,383 8,950
Recurring | Level 1    
Assets at fair value on a recurring basis:    
Total debt securities 66 58
Equity securities 12 17
Brokered certificates of deposit 0 0
Other 0 0
Total trading assets 78 75
Available-for-sale securities, fair value 423 430
Total derivative assets 12 2
Total all other investments 279 277
Other assets – client-owned fractional shares 188 171
Total assets at fair value on a recurring basis 980 955
Liabilities at fair value on a recurring basis:    
Total debt securities 216 167
Equity securities 39 31
Other liabilities 0  
Total trading liabilities 255 198
Derivative liabilities   3
Other payables – repurchase liabilities related to client-owned fractional shares 188 171
Total liabilities at fair value on a recurring basis 452 372
Recurring | Level 1 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 12 2
Liabilities at fair value on a recurring basis:    
Derivative liabilities 9 3
Recurring | Level 1 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Liabilities at fair value on a recurring basis:    
Derivative liabilities   0
Recurring | Level 1 | Other    
Liabilities at fair value on a recurring basis:    
Derivative liabilities   0
Recurring | Level 1 | Municipal and provincial obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 4 3
Recurring | Level 1 | Corporate obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 1 | Government and agency obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 212 164
Recurring | Level 1 | Agency MBS and CMOs    
Liabilities at fair value on a recurring basis:    
Total debt securities   0
Recurring | Level 1 | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 11 6
Recurring | Level 1 | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 15 11
Recurring | Level 1 | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 40 41
Total all other investments 86 92
Recurring | Level 1 | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 1 | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 1 | Other    
Assets at fair value on a recurring basis:    
Total all other investments 193 185
Recurring | Level 2    
Assets at fair value on a recurring basis:    
Total debt securities 1,329 1,437
Equity securities 6 3
Brokered certificates of deposit 19 19
Other 0 0
Total trading assets 1,354 1,459
Available-for-sale securities, fair value 5,979 6,458
Total derivative assets 273 305
Total all other investments 2 1
Other assets – client-owned fractional shares 0 0
Total assets at fair value on a recurring basis 7,608 8,223
Liabilities at fair value on a recurring basis:    
Total debt securities 469 693
Equity securities 1 0
Other liabilities 0  
Total trading liabilities 470 693
Derivative liabilities   308
Other payables – repurchase liabilities related to client-owned fractional shares 0 0
Total liabilities at fair value on a recurring basis 742 1,001
Recurring | Level 2 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 263 304
Liabilities at fair value on a recurring basis:    
Derivative liabilities 272 306
Recurring | Level 2 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 10 1
Liabilities at fair value on a recurring basis:    
Derivative liabilities   2
Recurring | Level 2 | Other    
Liabilities at fair value on a recurring basis:    
Derivative liabilities   0
Recurring | Level 2 | Municipal and provincial obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 2 | Corporate obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 469 651
Recurring | Level 2 | Government and agency obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 2 | Agency MBS and CMOs    
Liabilities at fair value on a recurring basis:    
Total debt securities   42
Recurring | Level 2 | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 306 403
Recurring | Level 2 | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 580 659
Recurring | Level 2 | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 87 108
Total all other investments 0 0
Recurring | Level 2 | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 214 231
Recurring | Level 2 | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 142 36
Recurring | Level 2 | Other    
Assets at fair value on a recurring basis:    
Total all other investments 2 1
Recurring | Level 3    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Equity securities 0 0
Brokered certificates of deposit 0 0
Other 2 4
Total trading assets 2 4
Available-for-sale securities, fair value 0 0
Total derivative assets 0 0
Total all other investments 7 7
Other assets – client-owned fractional shares 0 0
Total assets at fair value on a recurring basis 9 11
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Equity securities 0 0
Other liabilities 1  
Total trading liabilities 1 0
Derivative liabilities   2
Other payables – repurchase liabilities related to client-owned fractional shares 0 0
Total liabilities at fair value on a recurring basis 1 2
Recurring | Level 3 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Liabilities at fair value on a recurring basis:    
Derivative liabilities 0 0
Recurring | Level 3 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Liabilities at fair value on a recurring basis:    
Derivative liabilities   0
Recurring | Level 3 | Other    
Liabilities at fair value on a recurring basis:    
Derivative liabilities   2
Recurring | Level 3 | Municipal and provincial obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Corporate obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Government and agency obligations    
Liabilities at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Agency MBS and CMOs    
Liabilities at fair value on a recurring basis:    
Total debt securities   0
Recurring | Level 3 | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Total all other investments 0 0
Recurring | Level 3 | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 0 0
Recurring | Level 3 | Other    
Assets at fair value on a recurring basis:    
Total all other investments $ 7 $ 7