FAIR VALUE MEASUREMENT - Market Valuation Adjustments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Credit and funding valuation adjustments contra-liability (contra-asset) | |||||
| Counterparty CVA | $ (583) | $ (583) | $ (561) | ||
| Asset FVA | (709) | (709) | (573) | ||
| Citigroup (own credit) CVA | 304 | 304 | 331 | ||
| Liability FVA | 174 | 174 | 185 | ||
| Total CVA and FVA—derivative instruments | (814) | (814) | $ (618) | ||
| Credit, Funding and Debt Valuation Adjustments Gain (Loss) [Abstract] | |||||
| Counterparty CVA | (23) | $ (37) | (88) | $ (61) | |
| Asset FVA | 77 | (40) | 22 | (3) | |
| Own credit CVA | (99) | (27) | (2) | 19 | |
| Liability FVA | (20) | 12 | 28 | 17 | |
| Derivative Credit Risk and Funding Valuation Adjustment, Gain (Loss), Net | (65) | (92) | (40) | (28) | |
| DVA related to own FVO liabilities | (1,403) | (391) | 429 | 609 | |
| Total CVA, DVA and FVA | $ (1,468) | $ (483) | $ 389 | $ 581 | |