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AVAILABLE-FOR-SALE SECURITIES, Gross Unrealized Losses and Fair Value and Significant Assumptions (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months $ 1,075 $ 241
Unrealized losses less than 12 months (8) 0
Fair value 12 months or more 4,740 5,737
Unrealized losses 12 months or more (488) (532)
Fair value 5,815 5,978
Unrealized losses (496) (532)
Agency residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 365 23
Unrealized losses less than 12 months (3) 0
Fair value 12 months or more 2,526 2,994
Unrealized losses 12 months or more (244) (265)
Fair value 2,891 3,017
Unrealized losses (247) (265)
Agency commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 5 0
Unrealized losses less than 12 months 0 0
Fair value 12 months or more 871 1,129
Unrealized losses 12 months or more (70) (85)
Fair value 876 1,129
Unrealized losses (70) (85)
Agency CMOs    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 401 2
Unrealized losses less than 12 months (3) 0
Fair value 12 months or more 871 978
Unrealized losses 12 months or more (139) (147)
Fair value 1,272 980
Unrealized losses (142) (147)
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 243 215
Unrealized losses less than 12 months (1) 0
Fair value 12 months or more 8 9
Unrealized losses 12 months or more 0 0
Fair value 251 224
Unrealized losses (1) 0
Other agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 43 0
Unrealized losses less than 12 months (1) 0
Fair value 12 months or more 95 227
Unrealized losses 12 months or more (1) (2)
Fair value 138 227
Unrealized losses (2) (2)
Non-agency residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 12 0
Unrealized losses less than 12 months 0 0
Fair value 12 months or more 355 380
Unrealized losses 12 months or more (33) (32)
Fair value 367 380
Unrealized losses (33) (32)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 5 0
Unrealized losses less than 12 months 0 0
Fair value 12 months or more 9 15
Unrealized losses 12 months or more 0 (1)
Fair value 14 15
Unrealized losses 0 (1)
Other    
Debt Securities, Available-for-sale [Line Items]    
Fair value less than 12 months 1 1
Unrealized losses less than 12 months 0 0
Fair value 12 months or more 5 5
Unrealized losses 12 months or more (1) 0
Fair value 6 6
Unrealized losses $ (1) $ 0