INVESTMENT SECURITIES - Realized and Unrealized Gain (Loss) on Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Net unrealized gains (losses) for equity securities with readily determinable fair value (RDFV) | $ (378) | $ 522 | $ 62 | $ 6,562 |
| Proceeds from debt/equity securities sales and early redemptions | 1,083 | 3,745 | 4,278 | 6,754 |
| Gross realized gains on debt securities | 9 | 26 | 17 | 38 |
| Gross realized losses on debt securities | $ (28) | $ (25) | $ (38) | $ (46) |