OTHER NON-INTEREST INCOME AND OTHER NON-INTEREST EXPENSES - Schedule of Components of Other Non-Interest Income (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Other Noninterest Income [Abstract] | ||||
| Payment protection products | $ 46 | $ 29 | $ 124 | $ 85 |
| Paper statement fees | 20 | 21 | 62 | 58 |
| Other | 0 | 0 | 1 | 5 |
| Total other non-interest income | $ 66 | $ 50 | $ 187 | $ 148 |