FAIR VALUE MEASUREMENT - Market Valuation Adjustments (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Credit and funding valuation adjustments contra-liability (contra-asset) | |||
| Counterparty CVA | $ (561) | $ (561) | |
| Asset FVA | (573) | (539) | |
| Citigroup (own credit) CVA | 331 | 346 | |
| Liability FVA | 185 | 209 | |
| Total CVA and FVA—derivative instruments | (618) | (545) | |
| Credit, Funding and Debt Valuation Adjustments Gain (Loss) [Abstract] | |||
| Counterparty CVA | (90) | (63) | $ (31) |
| Asset FVA | 22 | 68 | 64 |
| Own credit CVA | (18) | (56) | (212) |
| Liability FVA | 14 | (46) | (23) |
| Total CVA and FVA—derivative instruments | (72) | (97) | (202) |
| DVA related to own FVO liabilities | (1,285) | (573) | (2,078) |
| Total CVA, DVA and FVA | $ (1,357) | $ (670) | $ (2,280) |