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AVAILABLE-FOR-SALE SECURITIES (Tables)
 3 Months Ended
Dec. 31, 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. 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
December 31, 2022    
Agency residential MBS$5,486 $1 $(588)$4,899 
Agency commercial MBS1,484 — (199)1,285 
Agency CMOs1,585 — (240)1,345 
Other agency obligations692 — (29)663 
Non-agency residential MBS495 — (41)454 
U.S. Treasuries1,016 — (29)987 
Corporate bonds146 — (4)142 
Other18 — — 18 
Total available-for-sale securities$10,922 $1 $(1,130)$9,793 
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
December 31, 2022
Agency residential MBS
$1,322 $(99)$3,516 $(489)$4,838 $(588)
Agency commercial MBS
322 (21)963 (178)1,285 (199)
Agency CMOs
247 (24)1,098 (216)1,345 (240)
Other agency obligations615 (28)19 (1)634 (29)
Non-agency residential MBS454 (41)— — 454 (41)
U.S. Treasuries981 (28)6 (1)987 (29)
Corporate bonds107 (4)— — 107 (4)
Other 18 — — — 18 — 
         Total
$4,066 $(245)$5,602 $(885)$9,668 $(1,130)
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. As a result, as of December 31, 2022, the weighted-average life of our available-for-sale securities portfolio was approximately 4.49 years.
 December 31, 2022
$ in millionsWithin one yearAfter one but
within five years		After five but
within ten years		After ten yearsTotal
Agency residential MBS
     
Amortized cost
$— $142 $2,427 $2,917 $5,486 
Carrying value
$— $137 $2,189 $2,573 $4,899 
Weighted-average yield
— %2.47 %1.28 %1.88 %1.63 %
Agency commercial MBS
Amortized cost
$2 $803 $607 $72 $1,484 
Carrying value
$2 $725 $497 $61 $1,285 
Weighted-average yield
1.90 %1.67 %1.23 %1.55 %1.48 %
Agency CMOs
 
Amortized cost
$— $11 $29 $1,545 $1,585 
Carrying value
$— $11 $25 $1,309 $1,345 
Weighted-average yield
— %2.22 %1.56 %1.57 %1.57 %
Other agency obligations
Amortized cost
$— $567 $114 $11 $692 
Carrying value
$— $544 $108 $11 $663 
Weighted-average yield
— %2.64 %3.55 %2.94 %2.80 %
Non-agency residential MBS
Amortized cost
$— $— $— $495 $495 
Carrying value
$— $— $— $454 $454 
Weighted-average yield
— %— %— %4.06 %4.06 %
U.S. Treasuries
Amortized cost
$107 $909 $— $— $1,016 
Carrying value
$104 $883 $— $— $987 
Weighted-average yield
2.22 %2.69 %— %— %2.63 %
Corporate bonds
Amortized cost
$1 $117 $28 $— $146 
Carrying value
$1 $114 $27 $— $142 
Weighted-average yield
2.83 %5.51 %4.86 %— %5.37 %
Other
Amortized cost
$— $5 $5 $8 $18 
Carrying value
$— $5 $5 $8 $18 
Weighted-average yield
— %5.79 %5.23 %7.17 %6.30 %
Total available-for-sale securities
Amortized cost
$110 $2,554 $3,210 $5,048 $10,922 
Carrying value
$107 $2,419 $2,851 $4,416 $9,793 
Weighted-average yield
2.22 %2.48 %1.39 %2.01 %1.94 %