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AVAILABLE-FOR-SALE SECURITIES (Tables)
 9 Months Ended
Jun. 30, 2022
Debt Securities, Available-for-Sale [Abstract]  
Amortized Cost and Estimated Fair Values of Available-For-Sale Securities, and Continuous Unrealized Loss Position
The following table details the amortized costs and fair values of our available-for-sale securities.
$ in millionsCost basisGross
unrealized gains		Gross
unrealized losses		Fair value
June 30, 2022    
Agency residential MBS$5,903 $— $(390)$5,513 
Agency commercial MBS1,428 — (144)1,284 
Agency CMOs1,706 1 (161)1,546 
Other agency obligations578 — (11)567 
Non-agency residential MBS496 — (11)485 
U.S. Treasuries919 — (7)912 
Corporate bonds140 1 (1)140 
Other19 — (2)17 
Total available-for-sale securities$11,189 $2 $(727)$10,464 
September 30, 2021    
Agency residential MBS$5,168 $46 $(25)$5,189 
Agency commercial MBS1,285 7 (28)1,264 
Agency CMOs1,854 9 (16)1,847 
U.S. Treasuries15 — — 15 
Total available-for-sale securities$8,322 $62 $(69)$8,315 
The following table details the gross unrealized losses and fair values of securities that were in a loss position at the reporting period end, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position.
 Less than 12 months12 months or moreTotal
$ in millionsEstimated
fair value		Unrealized
losses		Estimated
fair value		Unrealized
losses		Estimated
fair value		Unrealized
losses
June 30, 2022
Agency residential MBS
$4,288 $(267)$1,149 $(123)$5,437 $(390)
Agency commercial MBS
607 (44)649 (100)1,256 (144)
Agency CMOs
961 (85)547 (76)1,508 (161)
Other agency obligations487 (11)— — 487 (11)
Non-agency residential MBS471 (11)— — 471 (11)
U.S. Treasuries776 (7)— — 776 (7)
Corporate bonds120 (1)— — 120 (1)
Other 18 (1)— (1)18 (2)
         Total
$7,728 $(427)$2,345 $(300)$10,073 $(727)
September 30, 2021
Agency residential MBS
$3,155 $(25)$18 $— $3,173 $(25)
Agency commercial MBS
645 (13)353 (15)998 (28)
Agency CMOs
918 (12)231 (4)1,149 (16)
U.S. Treasuries3 — — — 3 — 
Total
$4,721 $(50)$602 $(19)$5,323 $(69)
Contractual Maturities, Amortized Cost, Carrying Values, and Current Yields for Available-For-Sales Securities
The following table details the contractual maturities, amortized costs, carrying values and current yields for our available-for-sale securities.  Since our MBS and CMO available-for-sale securities are backed by mortgages, actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations without prepayment penalties. As a result, as of June 30, 2022, the weighted-average life of our available-for-sale securities portfolio was approximately 4.75 years.
 June 30, 2022
$ in millionsWithin one yearAfter one but
within five years		After five but
within ten years		After ten yearsTotal
Agency residential MBS
     
Amortized cost
$— $135 $2,621 $3,147 $5,903 
Carrying value
$— $133 $2,468 $2,912 $5,513 
Agency commercial MBS
Amortized cost
$19 $481 $853 $75 $1,428 
Carrying value
$19 $452 $746 $67 $1,284 
Agency CMOs
 
Amortized cost
$— $8 $34 $1,664 $1,706 
Carrying value
$— $8 $32 $1,506 $1,546 
Other agency obligations
Amortized cost
$— $467 $99 $12 $578 
Carrying value
$— $456 $98 $13 $567 
Non-agency residential MBS
Amortized cost
$— $— $— $496 $496 
Carrying value
$— $— $— $485 $485 
U.S. Treasuries
Amortized cost
$— $915 $4 $— $919 
Carrying value
$— $909 $3 $— $912 
Corporate bonds
Amortized cost
$— $78 $62 $— $140 
Carrying value
$— $77 $63 $— $140 
Other
Amortized cost
$1 $5 $— $13 $19 
Carrying value
$1 $4 $— $12 $17 
Total available-for-sale securities
Amortized cost
$20 $2,089 $3,673 $5,407 $11,189 
Carrying value
$20 $2,039 $3,410 $4,995 $10,464 
Weighted-average yield
2.15 %2.23 %1.33 %1.89 %1.76 %