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AVAILABLE-FOR-SALE SECURITIES (Tables)
 9 Months Ended
Jun. 30, 2023
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. See Note 3 for additional information regarding the fair value of available-for-sale securities.
$ in millionsCost basisGross
unrealized gains		Gross
unrealized losses		Fair value
June 30, 2023    
Agency residential MBS$5,064 $1 $(560)$4,505 
Agency commercial MBS1,469 — (197)1,272 
Agency CMOs1,497 — (245)1,252 
Other agency obligations710 — (28)682 
Non-agency residential MBS509 — (44)465 
U.S. Treasuries1,265 — (27)1,238 
Corporate bonds140 — (6)134 
Other18 — — 18 
Total available-for-sale securities$10,672 $1 $(1,107)$9,566 
September 30, 2022    
Agency residential MBS$5,662 $— $(668)$4,994 
Agency commercial MBS1,518 — (208)1,310 
Agency CMOs1,637 — (233)1,404 
Other agency obligations613 — (31)582 
Non-agency residential MBS492 — (41)451 
U.S. Treasuries1,014 — (28)986 
Corporate bonds146 — (5)141 
Other18 — (1)17 
Total available-for-sale securities$11,100 $— $(1,215)$9,885 
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, 2023
Agency residential MBS
$190 $(8)$4,274 $(552)$4,464 $(560)
Agency commercial MBS
136 (5)1,136 (192)1,272 (197)
Agency CMOs
26 (1)1,226 (244)1,252 (245)
Other agency obligations208 (3)474 (25)682 (28)
Non-agency residential MBS53 (2)412 (42)465 (44)
U.S. Treasuries325 (6)763 (21)1,088 (27)
Corporate bonds26 (1)65 (5)91 (6)
Other 5 — 13 — 18 — 
Total$969 $(26)$8,363 $(1,081)$9,332 $(1,107)
September 30, 2022
Agency residential MBS
$2,165 $(226)$2,829 $(442)$4,994 $(668)
Agency commercial MBS
494 (41)816 (167)1,310 (208)
Agency CMOs
337 (32)1,067 (201)1,404 (233)
Other agency obligations582 (31)— — 582 (31)
Non-agency residential MBS451 (41)— — 451 (41)
U.S. Treasuries982 (28)4 — 986 (28)
Corporate bonds128 (5)— — 128 (5)
Other17 (1)— — 17 (1)
Total
$5,156 $(405)$4,716 $(810)$9,872 $(1,215)
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.  Weighted-average yields are calculated on a taxable-equivalent basis based on estimated annual income divided by the average amortized cost of these 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. The weighted-average life of our available-for-sale securities portfolio, after factoring in estimated prepayments, was approximately 4.30 years as of June 30, 2023.
 June 30, 2023
$ in millionsWithin one yearAfter one but
within five years		After five but
within ten years		After ten yearsTotal
Agency residential MBS
     
Amortized cost
$— $127 $2,240 $2,697 $5,064 
Carrying value
$— $122 $2,011 $2,372 $4,505 
Weighted-average yield
— %2.46 %1.29 %1.90 %1.65 %
Agency commercial MBS
Amortized cost
$— $919 $499 $51 $1,469 
Carrying value
$— $824 $406 $42 $1,272 
Weighted-average yield
— %1.61 %1.21 %1.87 %1.48 %
Agency CMOs
 
Amortized cost
$— $10 $45 $1,442 $1,497 
Carrying value
$— $8 $40 $1,204 $1,252 
Weighted-average yield
— %2.27 %1.54 %1.57 %1.58 %
Other agency obligations
Amortized cost
$60 $560 $80 $10 $710 
Carrying value
$59 $539 $74 $10 $682 
Weighted-average yield
2.54 %3.24 %3.44 %3.07 %3.20 %
Non-agency residential MBS
Amortized cost
$— $— $— $509 $509 
Carrying value
$— $— $— $465 $465 
Weighted-average yield
— %— %— %4.10 %4.10 %
U.S. Treasuries
Amortized cost
$417 $848 $— $— $1,265 
Carrying value
$408 $830 $— $— $1,238 
Weighted-average yield
2.40 %3.51 %— %— %3.14 %
Corporate bonds
Amortized cost
$25 $87 $28 $— $140 
Carrying value
$25 $84 $25 $— $134 
Weighted-average yield
4.79 %6.32 %4.90 %— %5.76 %
Other
Amortized cost
$— $5 $5 $8 $18 
Carrying value
$— $5 $5 $8 $18 
Weighted-average yield
— %7.05 %5.23 %8.05 %7.06 %
Total available-for-sale securities
Amortized cost
$502 $2,556 $2,897 $4,717 $10,672 
Carrying value
$492 $2,412 $2,561 $4,101 $9,566 
Weighted-average yield
2.54 %2.81 %1.38 %2.05 %2.07 %