XML 59 R30.htm IDEA: XBRL DOCUMENT
v3.25.1

Related Party Transactions (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Related Party Transactions [Abstract] |
Schedule of Affiliate Receivables and Payables | The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of March 31, 2025, and December 31, 2024:
| March 31, 2025 |  |  | December 31, 2024
| Ameren Missouri | Ameren Illinois |  |  | Ameren Missouri | Ameren Illinois
Income taxes payable to parent(a) | $ | — | $ | 32 |  |  | $ | — | $ | 32
Income taxes receivable from parent(b) | 29 | — |  |  | 28 | —
(a)Included in “Accounts payable – affiliates” on the balance sheet. (b)Included in “Accounts receivable – affiliates” on the balance sheet.
Schedule of Related Party Transactions | The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2025 and 2024:
|  |  |  |  |  | Three Months
Agreement | Income Statement Line Item |  |  |  |  |  |  | Ameren Missouri |  | Ameren Illinois
Ameren Missouri power supply | Operating Revenues | 2025 |  |  |  |  | $ | (a) | $ | (a)
agreements with Ameren Illinois |  | 2024 |  |  |  |  |  | (b) |  | (a)
Ameren Missouri and Ameren Illinois | Operating Revenues | 2025 |  |  |  |  | $ | 7 |  | $ | (b)
rent and facility services |  | 2024 |  |  |  |  |  | 7 |  |  | (b)
Ameren Missouri and Ameren Illinois miscellaneous | Operating Revenues | 2025 |  |  |  |  | $ | (b) | $ | 2 |
support services |  | 2024 |  |  |  |  |  | (b) |  | 1 |
Total Operating Revenues |  | 2025 |  |  |  |  | $ | 7 |  | $ | 2 |
|  | 2024 |  |  |  |  |  | 7 |  |  | 1 |
Ameren Illinois power supply | Purchased Power | 2025 |  |  |  |  | $ | (a) | $ | (a)
agreements with Ameren Missouri |  | 2024 |  |  |  |  |  | (a) |  | (b)
Ameren Missouri and Ameren Illinois | Purchased Power | 2025 |  |  |  |  | $ | 3 |  | $ | (b)
transmission services from ATXI |  | 2024 |  |  |  |  |  | 2 |  |  | (b)
Total Purchased Power |  | 2025 |  |  |  |  | $ | 3 |  | $ | (b)
|  | 2024 |  |  |  |  |  | 2 |  |  | (b)
Ameren Missouri and Ameren Illinois | Other Operations and Maintenance | 2025 |  |  |  |  | $ | (b) | $ | 1 |
rent and facility services |  | 2024 |  |  |  |  |  | (b) |  | (b)
Ameren Services support services | Other Operations and Maintenance | 2025 |  |  |  |  | $ | 44 |  | $ | 40 |
agreement |  | 2024 |  |  |  |  |  | 38 |  |  | 37 |
Total Other Operations and |  | 2025 |  |  |  |  | $ | 44 |  | $ | 41 |
Maintenance |  | 2024 |  |  |  |  |  | 38 |  |  | 37 |
Money pool interest | (Interest Charges)/Other Income, Net | 2025 |  |  |  |  | $ | (b) | $ | (b)
|  | 2024 |  |  |  |  |  | (3) |  |  | (2) |
Long-term debt, net - related parties | (Interest Charges) | 2025 |  |  |  |  |  | (b) |  | (b)
|  | 2024 |  |  |  |  |  | — |  |  | — |
(a)Not applicable. (b)Amount less than $1 million.

X
- Definition [Table Text Block] for Schedule of Affiliate Receivables and Payables + References No definition available. + Details
Name: | aee_ScheduleofAffiliateReceivablesandPayablesTableTextBlock
Namespace Prefix: | aee_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration