MODERNIZATION - Schedule of Rollforward of Reserves (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Modernization Reserve Rollforward [Roll Forward] | ||
| Modernization expenses | $ 16 | $ 10 |
| SBO Initiatives | ||
| Modernization Reserve Rollforward [Roll Forward] | ||
| Beginning balance | 26 | |
| Modernization expenses | 16 | |
| Cash payments | (17) | |
| Ending balance | $ 25 | |