INVESTMENT SECURITIES (Schedule of Investment Securities, Taxable and Nontaxable) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Net Investment Income [Line Items] | ||||
| Available-for-sale | $ 73 | $ 83 | $ 217 | $ 251 |
| Held-to-maturity | 51 | 55 | 155 | 168 |
| Interest on securities | 124 | 138 | 372 | 419 |
| Taxable | ||||
| Net Investment Income [Line Items] | ||||
| Available-for-sale | 66 | 75 | 196 | 227 |
| Held-to-maturity | 49 | 54 | 151 | 165 |
| Interest on securities | 115 | 129 | 347 | 392 |
| Nontaxable | ||||
| Net Investment Income [Line Items] | ||||
| Available-for-sale | 7 | 8 | 21 | 24 |
| Held-to-maturity | 2 | 1 | 4 | 3 |
| Interest on securities | $ 9 | $ 9 | $ 25 | $ 27 |