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AVAILABLE-FOR-SALE SECURITIES (Tables)
 6 Months Ended
Mar. 31, 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
March 31, 2023    
Agency residential MBS$5,272 $1 $(520)$4,753 
Agency commercial MBS1,477 — (178)1,299 
Agency CMOs1,545 — (218)1,327 
Other agency obligations760 — (23)737 
Non-agency residential MBS518 — (39)479 
U.S. Treasuries1,043 — (22)1,021 
Corporate bonds145 — (5)140 
Other17 — — 17 
Total available-for-sale securities$10,777 $1 $(1,005)$9,773 
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
March 31, 2023
Agency residential MBS
$673 $(40)$4,018 $(480)$4,691 $(520)
Agency commercial MBS
145 (4)1,154 (174)1,299 (178)
Agency CMOs
40 (1)1,287 (217)1,327 (218)
Other agency obligations386 (11)301 (12)687 (23)
Non-agency residential MBS469 (39)— — 469 (39)
U.S. Treasuries749 (16)247 (6)996 (22)
Corporate bonds125 (5)— — 125 (5)
Other 13 — — — 13 — 
Total$2,600 $(116)$7,007 $(889)$9,607 $(1,005)
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 March 31, 2023, the weighted-average life of our available-for-sale securities portfolio was approximately 4.38 years.
 March 31, 2023
$ in millionsWithin one yearAfter one but
within five years		After five but
within ten years		After ten yearsTotal
Agency residential MBS
     
Amortized cost
$— $138 $2,332 $2,802 $5,272 
Carrying value
$— $134 $2,120 $2,499 $4,753 
Weighted-average yield
— %2.47 %1.30 %1.90 %1.65 %
Agency commercial MBS
Amortized cost
$— $876 $550 $51 $1,477 
Carrying value
$— $797 $459 $43 $1,299 
Weighted-average yield
— %1.63 %1.25 %1.87 %1.50 %
Agency CMOs
 
Amortized cost
$— $11 $41 $1,493 $1,545 
Carrying value
$— $10 $37 $1,280 $1,327 
Weighted-average yield
— %2.28 %1.51 %1.61 %1.61 %
Other agency obligations
Amortized cost
$35 $609 $105 $11 $760 
Carrying value
$34 $594 $99 $10 $737 
Weighted-average yield
2.16 %3.42 %3.58 %3.07 %3.38 %
Non-agency residential MBS
Amortized cost
$— $— $— $518 $518 
Carrying value
$— $— $— $479 $479 
Weighted-average yield
— %— %— %4.13 %4.13 %
U.S. Treasuries
Amortized cost
$191 $852 $— $— $1,043 
Carrying value
$188 $833 $— $— $1,021 
Weighted-average yield
2.28 %2.78 %— %— %2.69 %
Corporate bonds
Amortized cost
$1 $116 $28 $— $145 
Carrying value
$1 $112 $27 $— $140 
Weighted-average yield
2.88 %5.80 %4.95 %— %5.61 %
Other
Amortized cost
$— $5 $5 $7 $17 
Carrying value
$— $5 $4 $8 $17 
Weighted-average yield
— %6.66 %5.23 %7.47 %6.67 %
Total available-for-sale securities
Amortized cost
$227 $2,607 $3,061 $4,882 $10,777 
Carrying value
$223 $2,485 $2,746 $4,319 $9,773 
Weighted-average yield
2.27 %2.66 %1.42 %2.06 %2.03 %