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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Open Gross Derivative Volumes By Commodity Type | The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of December 31, 2024 and 2023. As of December 31, 2024, these contracts extended through October 2028, October 2029, and May 2032 for fuel oils, natural gas, and power, respectively.
| Quantity (in millions, except as indicated)
| 2024 | 2023
Commodity | Ameren Missouri | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois | Ameren
Fuel oils (in gallons) | 23 |  | — |  | 23 |  | 17 |  | — |  | 17 |
Natural gas (in mmbtu) | 45 |  | 213 |  | 258 |  | 53 |  | 218 |  | 271 |
Power (in MWhs) | — |  | 4 |  | 4 |  | — |  | 5 |  | 5 |
Uranium (pounds in thousands) | — |  | — |  | — |  | 186 |  | — |  | 186 |
Derivative Instruments Carrying Value | The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of December 31, 2024 and 2023:
| 2024 |  |  | 2023
Commodity | Balance Sheet Location |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren |  |  |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren
Fuel oils | Other current assets |  | $ | — |  |  |  | $ | — |  |  |  | $ | — |  |  |  |  | $ | 2 |  |  |  | $ | — |  |  |  | $ | 2 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  | — |
Natural gas | Other current assets |  | 2 |  |  |  | 2 |  |  |  | 4 |  |  |  |  | — |  |  |  | — |  |  |  | — |
| Other assets |  | 2 |  |  |  | 4 |  |  |  | 6 |  |  |  |  | 3 |  |  |  | 3 |  |  |  | 6 |
Power | Other current assets |  | 6 |  |  |  | — |  |  |  | 6 |  |  |  |  | 5 |  |  |  | — |  |  |  | 5 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  | — |
Uranium | Other current assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  | — |
| Total assets |  | $ | 10 |  |  |  | $ | 6 |  |  |  | $ | 16 |  |  |  |  | $ | 19 |  |  |  | $ | 3 |  |  |  | $ | 22 |
Fuel oils | Other current liabilities |  | $ | 2 |  |  |  | $ | — |  |  |  | $ | 2 |  |  |  |  | $ | 1 |  |  |  | $ | — |  |  |  | $ | 1 |
| Other deferred credits and liabilities |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Natural gas | Other current liabilities |  | 5 |  |  |  | 22 |  |  |  | 27 |  |  |  |  | 12 |  |  |  | 45 |  |  |  | 57 |
| Other deferred credits and liabilities |  | 6 |  |  |  | 13 |  |  |  | 19 |  |  |  |  | 10 |  |  |  | 30 |  |  |  | 40 |
Power | Other current liabilities |  | — |  |  |  | 10 |  |  |  | 10 |  |  |  |  | 1 |  |  |  | 12 |  |  |  | 13 |
| Other deferred credits and liabilities |  | — |  |  |  | 43 |  |  |  | 43 |  |  |  |  | — |  |  |  | 56 |  |  |  | 56 |
| Total liabilities |  | $ | 15 |  |  |  | $ | 88 |  |  |  | $ | 103 |  |  |  |  | $ | 25 |  |  |  | $ | 143 |  |  |  | $ | 168 |

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