XML 119 R39.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Derivative Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
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, 2023 and 2022. As of December 31, 2023, these contracts extended through October 2026, October 2029, May 2032, and March 2024 for fuel oils, natural gas, power, and uranium, respectively.
| Quantity (in millions, except as indicated)
| 2023 | 2022
Commodity | Ameren Missouri | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois | Ameren
Fuel oils (in gallons) | 17 |  | — |  | 17 |  | 18 |  | — |  | 18 |
Natural gas (in mmbtu) | 53 |  | 218 |  | 271 |  | 48 |  | 157 |  | 205 |
Power (in MWhs) | — |  | 5 |  | 5 |  | 1 |  | 6 |  | 7 |
Uranium (pounds in thousands) | 186 |  | — |  | 186 |  | 514 |  | — |  | 514 |
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, 2023 and 2022:
| 2023 |  |  | 2022
Commodity | Balance Sheet Location |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren |  |  |  | Ameren Missouri |  |  | Ameren Illinois |  |  | Ameren
Fuel oils | Other current assets |  | $ | 2 |  |  |  | $ | — |  |  |  | $ | 2 |  |  |  |  | $ | 13 |  |  |  | $ | — |  |  |  | $ | 13 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 3 |  |  |  | — |  |  |  | 3 |
Natural gas | Other current assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 7 |  |  |  | 23 |  |  |  | 30 |
| Other assets |  | 3 |  |  |  | 3 |  |  |  | 6 |  |  |  |  | 9 |  |  |  | 11 |  |  |  | 20 |
Power | Other current assets |  | 5 |  |  |  | — |  |  |  | 5 |  |  |  |  | 14 |  |  |  | 2 |  |  |  | 16 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | 4 |  |  |  | 4 |
Uranium | Other current assets |  | 9 |  |  |  | — |  |  |  | 9 |  |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
| Other assets |  | — |  |  |  | — |  |  |  | — |  |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
| Total assets |  | $ | 19 |  |  |  | $ | 3 |  |  |  | $ | 22 |  |  |  |  | $ | 49 |  |  |  | $ | 40 |  |  |  | $ | 89 |
Fuel oils | Other current liabilities |  | $ | 1 |  |  |  | $ | — |  |  |  | $ | 1 |  |  |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | — |
| Other deferred credits and liabilities |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  |  | — |  |  |  | — |  |  |  | — |
Natural gas | Other current liabilities |  | 12 |  |  |  | 45 |  |  |  | 57 |  |  |  |  | 7 |  |  |  | 20 |  |  |  | 27 |
| Other deferred credits and liabilities |  | 10 |  |  |  | 30 |  |  |  | 40 |  |  |  |  | 2 |  |  |  | 9 |  |  |  | 11 |
Power | Other current liabilities |  | 1 |  |  |  | 12 |  |  |  | 13 |  |  |  |  | 59 |  |  |  | 2 |  |  |  | 61 |
| Other deferred credits and liabilities |  | — |  |  |  | 56 |  |  |  | 56 |  |  |  |  | — |  |  |  | 37 |  |  |  | 37 |
| Total liabilities |  | $ | 25 |  |  |  | $ | 143 |  |  |  | $ | 168 |  |  |  |  | $ | 68 |  |  |  | $ | 68 |  |  |  | $ | 136 |
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 December 31, 2023 and 2022:
|  |  |  | 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
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 |
2022 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 49 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 40 |
Ameren Illinois | 40 |  |  | 20 |  |  | — |  |  | 20 |
Ameren | $ | 89 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 60 |
Liabilities: |  |  |  |  |  |  |  |
Ameren Missouri | $ | 68 |  |  | $ | 9 |  |  | $ | 56 |  |  | $ | 3 |
Ameren Illinois | 68 |  |  | 20 |  |  | — |  |  | 48 |
Ameren | $ | 136 |  |  | $ | 29 |  |  | $ | 56 |  |  | $ | 51 |
(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 “Current collateral assets” and “Other assets” on the balance sheet for Ameren and Ameren Missouri and “Other current assets” and “Other assets” for Ameren Illinois.
Derivative Credit Risk Related Contingent Features | The following table presents, as of December 31, 2023, 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 | $ | 24 |  |  | $ | — |  |  | $ | 19 |
Ameren Illinois | 74 |  |  | 6 |  |  | 66 |
Ameren | $ | 98 |  |  | $ | 6 |  |  | $ | 85 |
(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.

X
- Definition Derivative Instruments with Credit Risk Related Contingent Features + References No definition available. + Details
Name: | aee_DerivativeCreditRiskRelatedContingentFeaturesTableTextBlock
Namespace Prefix: | aee_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Offsetting Assets and Liabilities + References No definition available. + Details
Name: | aee_OffsettingAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | aee_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration