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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2024
Investments [Abstract]  
Schedule of Amortized Cost and Fair Value of Investment Securities
The following tables include the amortized cost and fair value of investment securities at September 30, 2024 and December 31, 2023.

Amortized Cost and Fair Value - Investment Securities
dollars in millions September 30, 2024
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Investment securities available for sale
U.S. Treasury$11,765 $78 $(26)$11,817 
Government agency87 — (2)85 
Residential mortgage-backed securities13,201 234 (419)13,016 
Commercial mortgage-backed securities2,925 25 (172)2,778 
Corporate bonds507 — (30)477 
Municipal bonds17 — — 17 
Total investment securities available for sale$28,502 $337 $(649)$28,190 
Investment in marketable equity securities$70 $18 $(6)$82 
Investment securities held to maturity
U.S. Treasury$482 $— $(27)$455 
Government agency1,512 — (99)1,413 
Residential mortgage-backed securities4,667 37 (545)4,159 
Commercial mortgage-backed securities3,429 — (564)2,865 
Supranational securities299 — (25)274 
Other2 — — 2 
Total investment securities held to maturity$10,391 $37 $(1,260)$9,168 
Total investment securities$38,963 $392 $(1,915)$37,440 
December 31, 2023
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Investment securities available for sale
U.S. Treasury$10,554 $34 $(80)$10,508 
Government agency120 — (3)117 
Residential mortgage-backed securities7,154 72 (540)6,686 
Commercial mortgage-backed securities2,319 9 (197)2,131 
Corporate bonds529 — (47)482 
Municipal bonds12 — — 12 
Total investment securities available for sale$20,688 $115 $(867)$19,936 
Investment in marketable equity securities$75 $17 $(8)$84 
Investment securities held to maturity
U.S. Treasury$479 $— $(40)$439 
Government agency1,506 — (143)1,363 
Residential mortgage-backed securities4,205 — (644)3,561 
Commercial mortgage-backed securities3,489 — (614)2,875 
Supranational securities298 — (35)263 
Other2 — — 2 
Total investment securities held to maturity$9,979 $— $(1,476)$8,503 
Total investment securities$30,742 $132 $(2,351)$28,523 
Schedule of Investment Securities Maturity Information
The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Residential and commercial mortgage-backed and government agency securities are stated separately as they are not due at a single maturity date.

Maturities - Debt Securities
dollars in millionsSeptember 30, 2024December 31, 2023
Amortized CostFair ValueAmortized CostFair Value
Investment securities available for sale
Non-amortizing securities maturing in:
One year or less$6,014 $6,013 $5,674 $5,658 
After one through five years5,880 5,925 4,996 4,959 
After five through 10 years373 352 408 369 
After 10 years22 21 17 16 
Government agency87 85 120 117 
Residential mortgage-backed securities13,201 13,016 7,154 6,686 
Commercial mortgage-backed securities2,925 2,778 2,319 2,131 
Total investment securities available for sale$28,502 $28,190 $20,688 $19,936 
Investment securities held to maturity
Non-amortizing securities maturing in:
One year or less$186 $182 $27 $26 
After one through five years1,564 1,477 1,636 1,508 
After five through 10 years545 485 622 533 
Residential mortgage-backed securities4,667 4,159 4,205 3,561 
Commercial mortgage-backed securities3,429 2,865 3,489 2,875 
Total investment securities held to maturity$10,391 $9,168 $9,979 $8,503 
Schedule of Interest and Dividends on Investment Securities
The following table presents interest and dividend income on investment securities:

Interest and Dividends on Investment Securities
dollars in millionsThree Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Interest income - taxable investment securities$357 $178 $967 $402 
Interest income - nontaxable investment securities— 2 1 4 
Dividend income - marketable equity securities1 — 2 1 
Interest on investment securities$358 $180 $970 $407 
Schedule of Realized Losses The following table presents the gross realized losses on the sales of investment securities available for sale.
Realized Losses on Debt Securities Available For Sale
dollars in millionsThree Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Gross realized gains on sales of investment securities available for sale$— $— $— $— 
Gross realized losses on sales of investment securities available for sale— (12)— (26)
Net realized losses on sales of investment securities available for sale$— $(12)$— $(26)
Schedule of Unrealized Losses on Available-for-sale Securities
The following table provides information regarding investment securities available for sale with unrealized losses:

Gross Unrealized Losses on Debt Securities Available For Sale
dollars in millionsSeptember 30, 2024
Less than 12 months12 months or moreTotal
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Investment securities available for sale
U.S. Treasury$304 $— $1,370 $(26)$1,674 $(26)
Government agency— — 85 (2)85 (2)
Residential mortgage-backed securities260 (1)3,816 (418)4,076 (419)
Commercial mortgage-backed securities91 (1)1,314 (171)1,405 (172)
Corporate bonds4 — 456 (30)460 (30)
Total$659 $(2)$7,041 $(647)$7,700 $(649)
December 31, 2023
Less than 12 months12 months or moreTotal
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Investment securities available for sale
U.S. Treasury$955 $— $1,919 $(80)$2,874 $(80)
Government agency23 — 94 (3)117 (3)
Residential mortgage-backed securities293 (3)4,073 (537)4,366 (540)
Commercial mortgage-backed securities157 (1)1,386 (196)1,543 (197)
Corporate bonds89 (9)393 (38)482 (47)
Total$1,517 $(13)$7,865 $(854)$9,382 $(867)