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FAIR VALUE, Recurring and Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Assets at fair value on a recurring basis:    
Available-for-sale securities, fair value $ 6,496 $ 6,888
Total derivative assets 261 307
Netting adjustments (229) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 32 68
Derivative liabilities    
Derivative liabilities 272 313
Netting adjustments (57) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 215 190
Recurring    
Assets at fair value on a recurring basis:    
Total debt securities 1,552 1,495
Equity securities 14 20
Brokered certificates of deposit 58 19
Other 3 4
Total trading assets 1,627 1,538
Available-for-sale securities, fair value 6,496 6,888
Netting adjustments (229) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 32 68
Total all other investments 271 285
Other assets – client-owned fractional shares 216 171
Total assets at fair value on a recurring basis 8,754 9,055
Other investments – private equity – measured at net asset value (“NAV”) 112 105
Trading liabilities:    
Total debt securities 823 860
Equity securities 68 31
Total trading liabilities 891 891
Derivative liabilities    
Netting adjustments (57) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 215 190
Other payables:    
Repurchase liabilities related to client-owned fractional shares 216 171
Acquisition-related contingent consideration 180  
Total other payables 396  
Total liabilities at fair value on a recurring basis 1,502 1,252
Recurring | Interest rate    
Assets at fair value on a recurring basis:    
Netting adjustments (229) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 31 67
Derivative liabilities    
Netting adjustments (57) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 214 186
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 1 1
Derivative liabilities    
Netting adjustments 0  
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 1 2
Recurring | Other    
Derivative liabilities    
Net amounts presented on the Condensed Consolidated Statements of Financial Condition   2
Recurring | Municipal and provincial obligations    
Trading liabilities:    
Total debt securities 4 3
Recurring | Corporate obligations    
Trading liabilities:    
Total debt securities 481 651
Recurring | Government and agency obligations    
Trading liabilities:    
Total debt securities 215 164
Recurring | Agency MBS and CMOs    
Trading liabilities:    
Total debt securities 123 42
Recurring | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 407 409
Recurring | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 553 670
Recurring | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 120 149
Total all other investments 60 92
Recurring | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 379 231
Recurring | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 93 36
Recurring | Other    
Assets at fair value on a recurring basis:    
Total all other investments 211 193
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 8,642 8,950
Recurring | Level 1    
Assets at fair value on a recurring basis:    
Total debt securities 72 58
Equity securities 10 17
Brokered certificates of deposit 0 0
Other 0 0
Total trading assets 82 75
Available-for-sale securities, fair value 531 430
Total derivative assets 3 2
Total all other investments 259 277
Other assets – client-owned fractional shares 216 171
Total assets at fair value on a recurring basis 1,091 955
Trading liabilities:    
Total debt securities 219 167
Equity securities 68 31
Total trading liabilities 287 198
Derivative liabilities    
Derivative liabilities 3 3
Other payables:    
Repurchase liabilities related to client-owned fractional shares 216 171
Acquisition-related contingent consideration 0  
Total other payables 216  
Total liabilities at fair value on a recurring basis 506 372
Recurring | Level 1 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 3 2
Derivative liabilities    
Derivative liabilities 3 3
Recurring | Level 1 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Derivative liabilities    
Derivative liabilities 0 0
Recurring | Level 1 | Other    
Derivative liabilities    
Derivative liabilities   0
Recurring | Level 1 | Municipal and provincial obligations    
Trading liabilities:    
Total debt securities 4 3
Recurring | Level 1 | Corporate obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 1 | Government and agency obligations    
Trading liabilities:    
Total debt securities 215 164
Recurring | Level 1 | Agency MBS and CMOs    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 1 | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 13 6
Recurring | Level 1 | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 14 11
Recurring | Level 1 | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 45 41
Total all other investments 60 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 199 185
Recurring | Level 2    
Assets at fair value on a recurring basis:    
Total debt securities 1,480 1,437
Equity securities 4 3
Brokered certificates of deposit 58 19
Other 0 0
Total trading assets 1,542 1,459
Available-for-sale securities, fair value 5,965 6,458
Total derivative assets 258 305
Total all other investments 5 1
Other assets – client-owned fractional shares 0 0
Total assets at fair value on a recurring basis 7,770 8,223
Trading liabilities:    
Total debt securities 604 693
Equity securities 0 0
Total trading liabilities 604 693
Derivative liabilities    
Derivative liabilities 269 308
Other payables:    
Repurchase liabilities related to client-owned fractional shares 0 0
Acquisition-related contingent consideration 0  
Total other payables 0  
Total liabilities at fair value on a recurring basis 873 1,001
Recurring | Level 2 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 257 304
Derivative liabilities    
Derivative liabilities 268 306
Recurring | Level 2 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 1 1
Derivative liabilities    
Derivative liabilities 1 2
Recurring | Level 2 | Other    
Derivative liabilities    
Derivative liabilities   0
Recurring | Level 2 | Municipal and provincial obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 2 | Corporate obligations    
Trading liabilities:    
Total debt securities 481 651
Recurring | Level 2 | Government and agency obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 2 | Agency MBS and CMOs    
Trading liabilities:    
Total debt securities 123 42
Recurring | Level 2 | Municipal and provincial obligations    
Assets at fair value on a recurring basis:    
Total debt securities 394 403
Recurring | Level 2 | Corporate obligations    
Assets at fair value on a recurring basis:    
Total debt securities 539 659
Recurring | Level 2 | Government and agency obligations    
Assets at fair value on a recurring basis:    
Total debt securities 75 108
Total all other investments 0 0
Recurring | Level 2 | Agency MBS and CMOs    
Assets at fair value on a recurring basis:    
Total debt securities 379 231
Recurring | Level 2 | Non-agency CMOs and ABS    
Assets at fair value on a recurring basis:    
Total debt securities 93 36
Recurring | Level 2 | Other    
Assets at fair value on a recurring basis:    
Total all other investments 5 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 3 4
Total trading assets 3 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 10 11
Trading liabilities:    
Total debt securities 0 0
Equity securities 0 0
Total trading liabilities 0 0
Derivative liabilities    
Derivative liabilities 0 2
Other payables:    
Repurchase liabilities related to client-owned fractional shares 0 0
Acquisition-related contingent consideration 180  
Total other payables 180  
Total liabilities at fair value on a recurring basis 180 2
Recurring | Level 3 | Interest rate    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Derivative liabilities    
Derivative liabilities 0 0
Recurring | Level 3 | Foreign exchange    
Assets at fair value on a recurring basis:    
Total derivative assets 0 0
Derivative liabilities    
Derivative liabilities 0 0
Recurring | Level 3 | Other    
Derivative liabilities    
Derivative liabilities   2
Recurring | Level 3 | Municipal and provincial obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 3 | Corporate obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 3 | Government and agency obligations    
Trading liabilities:    
Total debt securities 0 0
Recurring | Level 3 | Agency MBS and CMOs    
Trading liabilities:    
Total debt securities 0 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