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Related Party Transactions (Tables) | 6 Months Ended
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Jun. 30, 2024
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 June 30, 2024, and December 31, 2023:
| June 30, 2024 |  |  | December 31, 2023
| Ameren Missouri | Ameren Illinois |  |  | Ameren Missouri | Ameren Illinois
Income taxes payable to parent(a) | $ | — | $ | 44 |  |  | $ | — | $ | 2
Income taxes receivable from parent(b) | 54 | — |  |  | 56 | 22
(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 and six months ended June 30, 2024 and 2023:
|  |  |  | Three Months |  | Six Months
Agreement | Income Statement Line Item |  |  | Ameren Missouri |  | Ameren Illinois |  | Ameren Missouri |  | Ameren Illinois
Ameren Missouri power supply | Operating Revenues | 2024 | $ | (b) | $ | (a) | $ | (b) | $ | (a)
agreements with Ameren Illinois |  | 2023 |  | (b) |  | (a) |  | (b) |  | (a)
Ameren Missouri and Ameren Illinois | Operating Revenues | 2024 | $ | 8 |  | $ | (b) | $ | 15 |  | $ | (b)
rent and facility services |  | 2023 |  | 8 |  |  | (b) |  | 18 |  |  | (b)
Ameren Missouri and Ameren Illinois miscellaneous | Operating Revenues | 2024 | $ | 1 |  | $ | (b) | $ | 1 |  | $ | 1 |
support services |  | 2023 |  | (b) |  | (b) |  | (b) |  | (b)
Total Operating Revenues |  | 2024 | $ | 9 |  | $ | (b) | $ | 16 |  | $ | 1 |
|  | 2023 |  | 8 |  |  | (b) |  | 18 |  |  | (b)
Ameren Illinois power supply | Purchased Power | 2024 | $ | (a) | $ | (b) | $ | (a) | $ | (b)
agreements with Ameren Missouri |  | 2023 |  | (a) |  | (b) |  | (a) |  | (b)
Ameren Missouri and Ameren Illinois | Purchased Power | 2024 | $ | 2 |  | $ | 1 |  | $ | 4 |  | $ | 1 |
transmission services from ATXI |  | 2023 |  | 1 |  |  | (b) |  | 1 |  |  | (b)
Total Purchased Power |  | 2024 | $ | 2 |  | $ | 1 |  | $ | 4 |  | $ | 1 |
|  | 2023 |  | 1 |  |  | (b) |  | 1 |  |  | (b)
Ameren Missouri and Ameren Illinois | Other Operations and Maintenance | 2024 | $ | (b) | $ | (b) | $ | (b) | $ | (b)
rent and facility services |  | 2023 |  | (b) |  | (b) |  | (b) |  | 2 |
Ameren Services support services | Other Operations and Maintenance | 2024 | $ | 43 |  | $ | 40 |  | $ | 81 |  | $ | 77 |
agreement |  | 2023 |  | 35 |  |  | 33 |  |  | 70 |  |  | 68 |
Total Other Operations and |  | 2024 | $ | 43 |  | $ | 40 |  | $ | 81 |  | $ | 77 |
Maintenance |  | 2023 |  | 35 |  |  | 33 |  |  | 70 |  |  | 70 |
Money pool interest | (Interest Charges)/Other Income, Net | 2024 | $ | (b) | $ | (b) | $ | (3) |  | $ | (2) |
|  | 2023 |  | (b) |  | (b) |  | (b) |  | (b)
(a)Not applicable. (b)Amount less than $1 million.

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- 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
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