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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2024, and December 31, 2023. As of June 30, 2024, these contracts extended through October 2027, October 2029 and May 2032 for fuel oils, natural gas and power, respectively.
| Quantity (in millions)
| June 30, 2024 | December 31, 2023
Commodity | Ameren Missouri | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois | Ameren
Fuel oils (in gallons) | 20 |  | — |  | 20 |  | 17 |  | — |  | 17 |
Natural gas (in mmbtu) | 52 |  | 221 |  | 273 |  | 53 |  | 218 |  | 271 |
Power (in MWhs) | — |  | 5 |  | 5 |  | — |  | 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 June 30, 2024, and December 31, 2023:
|  |  | June 30, 2024 | December 31, 2023
| Balance Sheet Location |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren |  |  |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren
Fuel oils | Other current assets |  | $ | 2 |  |  |  | $ | — |  |  |  | $ | 2 |  |  |  |  | $ | 2 |  |  |  | $ | — |  |  |  | $ | 2 |
Natural gas | Other current assets |  | 1 |  |  |  | 3 |  |  |  | 4 |  |  |  |  | — |  |  |  | — |  |  |  | — |
| Other assets |  | 2 |  |  |  | 1 |  |  |  | 3 |  |  |  |  | 3 |  |  |  | 3 |  |  |  | 6 |
Power | Other current assets |  | 15 |  |  |  | — |  |  |  | 15 |  |  |  |  | 5 |  |  |  | — |  |  |  | 5 |
Uranium | Other current assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
| Total assets |  | $ | 20 |  |  |  | $ | 4 |  |  |  | $ | 24 |  |  |  |  | $ | 19 |  |  |  | $ | 3 |  |  |  | $ | 22 |
Fuel oils | Other current liabilities |  | $ | 1 |  |  |  | $ | — |  |  |  | $ | 1 |  |  |  |  | $ | 1 |  |  |  | $ | — |  |  |  | $ | 1 |
| Other deferred credits and liabilities |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Natural gas | Other current liabilities |  | 9 |  |  |  | 33 |  |  |  | 42 |  |  |  |  | 12 |  |  |  | 45 |  |  |  | 57 |
| Other deferred credits and liabilities |  | 8 |  |  |  | 28 |  |  |  | 36 |  |  |  |  | 10 |  |  |  | 30 |  |  |  | 40 |
Power | Other current liabilities |  | 1 |  |  |  | 11 |  |  |  | 12 |  |  |  |  | 1 |  |  |  | 12 |  |  |  | 13 |
| Other deferred credits and liabilities |  | — |  |  |  | 50 |  |  |  | 50 |  |  |  |  | — |  |  |  | 56 |  |  |  | 56 |
| Total liabilities |  | $ | 19 |  |  |  | $ | 122 |  |  |  | $ | 141 |  |  |  |  | $ | 25 |  |  |  | $ | 143 |  |  |  | $ | 168 |
Offsetting Assets and Liabilities | The following table provides the recognized gross derivative balances and the net amounts of those derivatives subject to an enforceable master netting arrangement or similar agreement as of June 30, 2024, and December 31, 2023:
|  |  |  | Gross Amounts Not Offset in the Balance Sheet |  |
Commodity Contracts Eligible to be Offset |  | Gross Amounts Recognized in the Balance Sheet |  | Derivative Instruments |  | Cash Collateral Received/Posted(a) |  | Net Amount
June 30, 2024 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Ameren Missouri |  | $ | 20 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 15 |
Ameren Illinois |  | 4 |  |  | 2 |  |  | — |  |  | 2 |
Ameren |  | $ | 24 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 17 |
Liabilities: |  |  |  |  |  |  |  |
Ameren Missouri |  | $ | 19 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 14 |
Ameren Illinois |  | 122 |  |  | 2 |  |  | — |  |  | 120 |
Ameren |  | $ | 141 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 134 |
December 31, 2023 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Ameren Missouri |  | $ | 19 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 13 |
Ameren Illinois |  | 3 |  |  | 1 |  |  | — |  |  | 2 |
Ameren |  | $ | 22 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 15 |
Liabilities: |  |  |  |  |  |  |  |
Ameren Missouri |  | $ | 25 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 19 |
Ameren Illinois |  | 143 |  |  | 1 |  |  | 6 |  |  | 136 |
Ameren |  | $ | 168 |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 155 |
(a)Cash collateral received reduces gross asset balances and is included in “Other current liabilities” and “Other deferred credits and liabilities” on the balance sheet. Cash collateral posted reduces gross liability balances and is included in “Other current assets” and “Other assets” on the balance sheet.
Derivative Instruments With Credit Risk-Related Contingent Features | The following table presents, as of June 30, 2024, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that counterparties could require:
| Aggregate Fair Value of Derivative Liabilities(a) |  | Cash Collateral Posted |  | Potential Aggregate Amount of Additional Collateral Required(b)
Ameren Missouri | $ | 19 |  |  | $ | — |  |  | $ | 13 |
Ameren Illinois | 61 |  |  | — |  |  | 59 |
Ameren | $ | 80 |  |  | $ | — |  |  | $ | 72 |
(a)Before consideration of master netting arrangements or similar agreements. (b)As collateral requirements with certain counterparties are based on master netting arrangements or similar agreements, the aggregate amount of additional collateral required to be posted is determined after consideration of the effects of such arrangements.

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- Definition The table presents the aggregate fair value of all derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that could be required to be posted with counterparties. The additional collateral required is the net liability position allowed under the master trading and netting agreements assuming (1) the credit risk-related contingent features underlying these agreements were triggered on the reporting date and (2) those counterparties with rights to do so required collateral. + References No definition available. + Details
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- Definition Tabular disclosure of derivative and other financial assets/liabilities that are subject to offsetting, including master netting arrangements. + References No definition available. + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
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