Short-Term Debt And Liquidity (Narrative) (Details) $ in Billions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2025
USD ($)
|
Jun. 30, 2024 |
Jun. 30, 2025
USD ($)
|
Jun. 30, 2024 |
|
| Credit Agreements | ||||
| Short-term Debt [Line Items] | ||||
| Net Liquidity Available | $ 1.4 | $ 1.4 | ||
| Actual debt-to-capital ratio | 0.61 | 0.61 | ||
| Utilities | ||||
| Short-term Debt [Line Items] | ||||
| Short-term Debt, Weighted Average Interest Rate, over Time | 4.64% | 5.51% | 4.58% | 5.41% |
| Union Electric Company | Missouri Credit Agreement | ||||
| Short-term Debt [Line Items] | ||||
| Actual debt-to-capital ratio | 0.50 | 0.50 | ||
| Ameren Illinois Company | Illinois Credit Agreement | ||||
| Short-term Debt [Line Items] | ||||
| Actual debt-to-capital ratio | 0.45 | 0.45 | ||