SEGMENT REPORTING - Schedule of Assets by Jurisdiction (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Total assets | $ 205,704 | $ 157,181 |
| U.S. | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 143,145 | 141,613 |
| U.K. | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 46,245 | 264 |
| Canada | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 8,530 | 5,582 |
| Bermuda and others | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | $ 7,784 | $ 9,722 |