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DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Asset and Liability Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Derivative assets    
Derivative assets $ 261 $ 307
Counterparty netting (34) (92)
Cash collateral netting (195) (147)
Total amounts offset (229) (239)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 32 68
Financial instruments (2) (1)
Total 30 67
Derivative liabilities    
Derivative liabilities 272 313
Counterparty netting (34) (92)
Cash collateral netting (23) (31)
Total amounts offset (57) (123)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition 215 190
Financial instruments 0 0
Total 215 190
Notional amount 22,029 24,173
Derivatives not designated as hedging instruments    
Derivative assets    
Derivative assets 260 306
Derivative liabilities    
Derivative liabilities 272 313
Notional amount 20,482 22,081
Derivatives not designated as hedging instruments | Interest rate    
Derivative assets    
Derivative assets 260 306
Derivative liabilities    
Derivative liabilities 271 309
Notional amount 19,145 20,446
Derivatives not designated as hedging instruments | Foreign exchange    
Derivative assets    
Derivative assets 0 0
Derivative liabilities    
Derivative liabilities 1 2
Notional amount 416 539
Derivatives not designated as hedging instruments | Other    
Derivative assets    
Derivative assets 0 0
Derivative liabilities    
Derivative liabilities 0 2
Notional amount 921 1,096
Derivatives designated as hedging instruments    
Derivative assets    
Derivative assets 1 1
Derivative liabilities    
Derivative liabilities 0 0
Notional amount 1,547 2,092
Derivatives designated as hedging instruments | Interest rate    
Derivative assets    
Derivative assets 0 0
Derivative liabilities    
Derivative liabilities 0 0
Notional amount 300 850
Derivatives designated as hedging instruments | Foreign exchange    
Derivative assets    
Derivative assets 1 1
Derivative liabilities    
Derivative liabilities 0 0
Notional amount $ 1,247 $ 1,242