REGULATORY MATTERS (2025 Rate Case) (Details) - Arizona Corporation Commission - Subsequent Event $ in Millions |
Apr. 13, 2026
USD ($)
|
|---|---|
| Public Utilities, General Disclosures [Line Items] | |
| Original cost rate base (percentage) | 7.73% |
| Original cost rate base | $ 4,300 |
| Return on equity (percentage) | 10.50% |
| Average original cost of debt (percentage) | 4.28% |
| Capital structure equity percentage | 55.00% |
| Capital structure debt percentage | 45.00% |
| Proposed earnings test deadband | 0.20% |
| Retail Revenues | |
| Public Utilities, General Disclosures [Line Items] | |
| Non-fuel base rate increase (decrease) | $ 159 |
| Non-Fuel Retail Revenues | |
| Public Utilities, General Disclosures [Line Items] | |
| Non-fuel base rate increase (decrease) | 205 |
| Fuel-Related Retail Revenues | |
| Public Utilities, General Disclosures [Line Items] | |
| Non-fuel base rate increase (decrease) | (26) |
| Revenue from Contract with Customer | |
| Public Utilities, General Disclosures [Line Items] | |
| Non-fuel base rate increase (decrease) | $ (20) |