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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 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 June 30, 2024 and December 31, 2023. Amortized Cost and Fair Value - Investment Securities
dollars in millions | June 30, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 11,818 |  |  | $ | 3 |  |  | $ | (70) |  |  | $ | 11,751 |
Government agency | 99 |  |  | — |  |  | (2) |  |  | 97 |
Residential mortgage-backed securities | 12,561 |  |  | 33 |  |  | (619) |  |  | 11,975 |
Commercial mortgage-backed securities | 2,938 |  |  | 1 |  |  | (212) |  |  | 2,727 |
Corporate bonds | 526 |  |  | — |  |  | (40) |  |  | 486 |
Municipal bonds | 17 |  |  | — |  |  | — |  |  | 17 |
Total investment securities available for sale | $ | 27,959 |  |  | $ | 37 |  |  | $ | (943) |  |  | $ | 27,053 |
Investment in marketable equity securities | $ | 75 |  |  | $ | 13 |  |  | $ | (10) |  |  | $ | 78 |
Investment securities held to maturity |  |  |  |  |  |  |
U.S. Treasury | $ | 481 |  |  | $ | — |  |  | $ | (41) |  |  | $ | 440 |
Government agency | 1,510 |  |  | — |  |  | (143) |  |  | 1,367 |
Residential mortgage-backed securities | 4,793 |  |  | 5 |  |  | (705) |  |  | 4,093 |
Commercial mortgage-backed securities | 3,450 |  |  | — |  |  | (668) |  |  | 2,782 |
Supranational securities | 299 |  |  | — |  |  | (37) |  |  | 262 |
Other | 2 |  |  | — |  |  | — |  |  | 2 |
Total investment securities held to maturity | $ | 10,535 |  |  | $ | 5 |  |  | $ | (1,594) |  |  | $ | 8,946 |
Total investment securities | $ | 38,569 |  |  | $ | 55 |  |  | $ | (2,547) |  |  | $ | 36,077 |
| December 31, 2023
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 10,554 |  |  | $ | 34 |  |  | $ | (80) |  |  | $ | 10,508 |
Government agency | 120 |  |  | — |  |  | (3) |  |  | 117 |
Residential mortgage-backed securities | 7,154 |  |  | 72 |  |  | (540) |  |  | 6,686 |
Commercial mortgage-backed securities | 2,319 |  |  | 9 |  |  | (197) |  |  | 2,131 |
Corporate bonds | 529 |  |  | — |  |  | (47) |  |  | 482 |
Municipal bonds | 12 |  |  | — |  |  | — |  |  | 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 agency | 1,506 |  |  | — |  |  | (143) |  |  | 1,363 |
Residential mortgage-backed securities | 4,205 |  |  | — |  |  | (644) |  |  | 3,561 |
Commercial mortgage-backed securities | 3,489 |  |  | — |  |  | (614) |  |  | 2,875 |
Supranational securities | 298 |  |  | — |  |  | (35) |  |  | 263 |
Other | 2 |  |  | — |  |  | — |  |  | 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 millions | June 30, 2024 |  | December 31, 2023
| Cost |  | Fair Value |  | Cost |  | Fair Value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 5,995 |  |  | $ | 5,961 |  |  | $ | 5,674 |  |  | $ | 5,658 |
After one through five years | 5,962 |  |  | 5,921 |  |  | 4,996 |  |  | 4,959 |
After five through 10 years | 382 |  |  | 351 |  |  | 408 |  |  | 369 |
After 10 years | 22 |  |  | 21 |  |  | 17 |  |  | 16 |
Government agency | 99 |  |  | 97 |  |  | 120 |  |  | 117 |
Residential mortgage-backed securities | 12,561 |  |  | 11,975 |  |  | 7,154 |  |  | 6,686 |
Commercial mortgage-backed securities | 2,938 |  |  | 2,727 |  |  | 2,319 |  |  | 2,131 |
Total investment securities available for sale | $ | 27,959 |  |  | $ | 27,053 |  |  | $ | 20,688 |  |  | $ | 19,936 |
Investment securities held to maturity |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 27 |  |  | $ | 26 |  |  | $ | 27 |  |  | $ | 26 |
After one through five years | 1,641 |  |  | 1,514 |  |  | 1,636 |  |  | 1,508 |
After five through 10 years | 624 |  |  | 531 |  |  | 622 |  |  | 533 |
Residential mortgage-backed securities | 4,793 |  |  | 4,093 |  |  | 4,205 |  |  | 3,561 |
Commercial mortgage-backed securities | 3,450 |  |  | 2,782 |  |  | 3,489 |  |  | 2,875 |
Total investment securities held to maturity | $ | 10,535 |  |  | $ | 8,946 |  |  | $ | 9,979 |  |  | $ | 8,503 |
Schedule of Interest and Dividends on Investment Securities | T he following table presents interest and dividend income on investment securities: Interest and Dividends on Investment Securities
dollars in millions | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023 |  |
Interest income - taxable investment securities | $ | 330 |  |  | $ | 118 |  |  | $ | 611 |  |  | $ | 224 |  |  |
Interest income - nontaxable investment securities | — |  |  | 2 |  |  | — |  |  | 2 |  |  |
Dividend income - marketable equity securities | — |  |  | — |  |  | 1 |  |  | 1 |  |  |
Interest on investment securities | $ | 330 |  |  | $ | 120 |  |  | $ | 612 |  |  | $ | 227 |  |  |
Schedule of Realized Losses | 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 millions | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023 |  |
Gross realized gains on sales of investment securities available for sale | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |
Gross realized losses on sales of investment securities available for sale | — |  |  | — |  |  | — |  |  | (14) |  |  |
Net realized losses on sales of investment securities available for sale | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (14) |  |  |
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 millions | June 30, 2024
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 7,954 |  |  | $ | (18) |  |  | $ | 1,745 |  |  | $ | (52) |  |  | $ | 9,699 |  |  | $ | (70) |
Government agency | — |  |  | — |  |  | 97 |  |  | (2) |  |  | 97 |  |  | (2) |
Residential mortgage-backed securities | 5,129 |  |  | (42) |  |  | 3,884 |  |  | (577) |  |  | 9,013 |  |  | (619) |
Commercial mortgage-backed securities | 822 |  |  | (6) |  |  | 1,322 |  |  | (206) |  |  | 2,144 |  |  | (212) |
Corporate bonds | 71 |  |  | (7) |  |  | 399 |  |  | (33) |  |  | 470 |  |  | (40) |
Total | $ | 13,976 |  |  | $ | (73) |  |  | $ | 7,447 |  |  | $ | (870) |  |  | $ | 21,423 |  |  | $ | (943) |
| December 31, 2023
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 955 |  |  | $ | — |  |  | $ | 1,919 |  |  | $ | (80) |  |  | $ | 2,874 |  |  | $ | (80) |
Government agency | 23 |  |  | — |  |  | 94 |  |  | (3) |  |  | 117 |  |  | (3) |
Residential mortgage-backed securities | 293 |  |  | (3) |  |  | 4,073 |  |  | (537) |  |  | 4,366 |  |  | (540) |
Commercial mortgage-backed securities | 157 |  |  | (1) |  |  | 1,386 |  |  | (196) |  |  | 1,543 |  |  | (197) |
Corporate bonds | 89 |  |  | (9) |  |  | 393 |  |  | (38) |  |  | 482 |  |  | (47) |
Total | $ | 1,517 |  |  | $ | (13) |  |  | $ | 7,865 |  |  | $ | (854) |  |  | $ | 9,382 |  |  | $ | (867) |

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