INVESTMENT SECURITIES (Schedule of Investment Securities, Taxable and Nontaxable) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Net Investment Income [Line Items] | ||||
| Available-for-sale | $ 72 | $ 83 | $ 144 | $ 168 |
| Held-to-maturity | 51 | 56 | 104 | 113 |
| Interest on securities | 123 | 139 | 248 | 281 |
| Taxable | ||||
| Net Investment Income [Line Items] | ||||
| Available-for-sale | 65 | 75 | 130 | 152 |
| Held-to-maturity | 50 | 55 | 102 | 111 |
| Interest on securities | 115 | 130 | 232 | 263 |
| Nontaxable | ||||
| Net Investment Income [Line Items] | ||||
| Available-for-sale | 7 | 8 | 14 | 16 |
| Held-to-maturity | 1 | 1 | 2 | 2 |
| Interest on securities | $ 8 | $ 9 | $ 16 | $ 18 |