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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
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 December 31, 2023 and 2022.

Amortized Cost and Fair Value - Investment Securities
dollars in millions 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 
December 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Investment securities available for sale
U.S. Treasury$2,035 $— $(137)$1,898 
Government agency164 — (2)162 
Residential mortgage-backed securities5,424 1 (630)4,795 
Commercial mortgage-backed securities1,774 — (170)1,604 
Corporate bonds570 — (34)536 
Total investment securities available for sale$9,967 $1 $(973)$8,995 
Investment in marketable equity securities$75 $21 $(1)$95 
Investment securities held to maturity
U.S. Treasury$474 $— $(50)$424 
Government agency1,548 — (186)1,362 
Residential mortgage-backed securities4,605 — (723)3,882 
Commercial mortgage-backed securities3,355 — (484)2,871 
Supranational securities295 — (41)254 
Other2 — — 2 
Total investment securities held to maturity$10,279 $— $(1,484)$8,795 
Total investment securities$20,321 $22 $(2,458)$17,885 
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 millionsDecember 31, 2023December 31, 2022
CostFair ValueCostFair Value
Investment securities available for sale
Non-amortizing securities maturing in:
One year or less$5,674 $5,658 $37 $37 
After one through five years4,996 4,959 2,068 1,928 
After five through 10 years408 369 483 455 
After 10 years17 16 17 14 
Government agency120 117 164 162 
Residential mortgage-backed securities7,154 6,686 5,424 4,795 
Commercial mortgage-backed securities2,319 2,131 1,774 1,604 
Total investment securities available for sale$20,688 $19,936 $9,967 $8,995 
Investment securities held to maturity
Non-amortizing securities maturing in:
One year or less$27 $26 $51 $51 
After one through five years1,636 1,508 1,479 1,328 
After five through 10 years622 533 789 663 
Residential mortgage-backed securities4,205 3,561 4,605 3,882 
Commercial mortgage-backed securities3,489 2,875 3,355 2,871 
Total investment securities held to maturity$9,979 $8,503 $10,279 $8,795 
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 millionsYear Ended December 31,
202320222021
Interest income - taxable investment securities$642 $352 $143 
Interest income - nontaxable investment securities4 — — 
Dividend income - marketable equity securities2 2 2 
Interest on investment securities$648 $354 $145 
Schedule of Realized Gain (Loss) The following table presents the gross realized losses and gains on the sales of investment securities available for sale.
Realized Losses on Debt Securities Available For Sale
dollars in millionsYear Ended December 31,
202320222021
Gross realized gains on sales of investment securities available for sale$— $— $33 
Gross realized losses on sales of investment securities available for sale(26)— — 
Net realized (losses) gains on sales of investment securities available for sale$(26)$— $33 
Schedule of Unrealized Loss 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 millionsDecember 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)
December 31, 2022
Less than 12 months12 months or moreTotal
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Investment securities available for sale
U.S. Treasury$403 $(27)$1,495 $(110)$1,898 $(137)
Government agency65 (1)62 (1)127 (2)
Residential mortgage-backed securities1,698 (165)3,001 (465)4,699 (630)
Commercial mortgage-backed securities836 (53)752 (117)1,588 (170)
Corporate bonds499 (30)37 (4)536 (34)
Total$3,501 $(276)$5,347 $(697)$8,848 $(973)