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AVAILABLE-FOR-SALE SECURITIES (Tables)
 3 Months Ended
Dec. 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
December 31, 2023    
Agency residential MBS$4,665 $2 $(451)$4,216 
Agency commercial MBS1,457 — (162)1,295 
Agency CMOs1,407 — (213)1,194 
Other agency obligations694 — (17)677 
Non-agency residential MBS550 1 (37)514 
U.S. Treasuries1,161 — (12)1,149 
Corporate bonds140 — (5)135 
Other18 — — 18 
Total available-for-sale securities$10,092 $3 $(897)$9,198 
September 30, 2023    
Agency residential MBS$4,865 $— $(654)$4,211 
Agency commercial MBS1,464 — (211)1,253 
Agency CMOs1,448 — (265)1,183 
Other agency obligations710 — (31)679 
Non-agency residential MBS527 — (64)463 
U.S. Treasuries1,261 — (21)1,240 
Corporate bonds140 — (6)134 
Other18 — — 18 
Total available-for-sale securities$10,433 $— $(1,252)$9,181 
Contractual Maturities, Amortized Cost, Carrying Values, and Current Yields for Available-For-Sales Securities
The following table details the contractual maturities, amortized costs, fair 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, the weighted-average life of our available-for-sale securities portfolio, after factoring in estimated prepayments, was approximately 4.0 years as of December 31, 2023.
 December 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
$1 $112 $2,033 $2,519 $4,665 
Fair value$1 $108 $1,865 $2,242 $4,216 
Weighted-average yield
2.11 %2.53 %1.31 %1.95 %1.68 %
Agency commercial MBS
Amortized cost
$18 $933 $457 $49 $1,457 
Fair value$18 $856 $380 $41 $1,295 
Weighted-average yield
3.45 %1.60 %1.20 %1.87 %1.51 %
Agency CMOs
 
Amortized cost
$— $7 $39 $1,361 $1,407 
Fair value$— $7 $35 $1,152 $1,194 
Weighted-average yield
— %2.39 %1.52 %1.58 %1.58 %
Other agency obligations
Amortized cost
$79 $525 $80 $10 $694 
Fair value$79 $513 $76 $9 $677 
Weighted-average yield
2.08 %3.26 %3.43 %3.07 %3.15 %
Non-agency residential MBS
Amortized cost
$— $— $— $550 $550 
Fair value$— $— $— $514 $514 
Weighted-average yield
— %— %— %4.33 %4.33 %
U.S. Treasuries
Amortized cost
$821 $340 $— $— $1,161 
Fair value$811 $338 $— $— $1,149 
Weighted-average yield
2.67 %4.64 %— %— %3.25 %
Corporate bonds
Amortized cost
$31 $86 $23 $— $140 
Fair value$30 $84 $21 $— $135 
Weighted-average yield
4.73 %5.58 %5.02 %— %5.30 %
Other
Amortized cost
$— $5 $5 $8 $18 
Fair value$— $5 $4 $9 $18 
Weighted-average yield
— %7.39 %5.22 %8.32 %7.26 %
Total available-for-sale securities
Amortized cost
$950 $2,008 $2,637 $4,497 $10,092 
Fair value$939 $1,911 $2,381 $3,967 $9,198 
Weighted-average yield
2.70 %2.79 %1.39 %2.14 %2.13 %
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
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 millionsFair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
December 31, 2023
Agency residential MBS
$18 $— $4,121 $(451)$4,139 $(451)
Agency commercial MBS
— — 1,292 (162)1,292 (162)
Agency CMOs
— — 1,194 (213)1,194 (213)
Other agency obligations63 — 614 (17)677 (17)
Non-agency residential MBS17 — 430 (37)447 (37)
U.S. Treasuries245 — 904 (12)1,149 (12)
Corporate bonds15 — 81 (5)96 (5)
Other 8 — 9 — 17 — 
Total$366 $— $8,645 $(897)$9,011 $(897)
September 30, 2023
Agency residential MBS
$73 $(3)$4,119 $(651)$4,192 $(654)
Agency commercial MBS
3 — 1,250 (211)1,253 (211)
Agency CMOs
— — 1,183 (265)1,183 (265)
Other agency obligations97 (1)582 (30)679 (31)
Non-agency residential MBS62 (1)401 (63)463 (64)
U.S. Treasuries120 — 995 (21)1,115 (21)
Corporate bonds13 — 78 (6)91 (6)
Other5 — 9 — 14 — 
Total
$373 $(5)$8,617 $(1,247)$8,990 $(1,252)