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v3.23.3

Related Party Transactions (Tables) | 9 Months Ended
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Sep. 30, 2023
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 September 30, 2023, and December 31, 2022:
| September 30, 2023 |  |  | December 31, 2022
| Ameren Missouri | Ameren Illinois |  |  | Ameren Missouri | Ameren Illinois
Income taxes payable to parent(a) | $ | 29 | $ | 81 |  |  | $ | — | $ | 50
Income taxes receivable from parent(b) | — | — |  |  | 39 | —
(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 nine months ended September 30, 2023 and 2022:
|  |  |  | Three Months |  | Nine Months
Agreement | Income Statement Line Item |  |  | Ameren Missouri |  | Ameren Illinois |  | Ameren Missouri |  | Ameren Illinois
Ameren Missouri power supply | Operating Revenues | 2023 | $ | 2 |  | $ | (a) | $ | 2 |  | $ | (a)
agreements with Ameren Illinois |  | 2022 |  | 2 |  |  | (a) |  | 7 |  |  | (a)
Ameren Missouri and Ameren Illinois | Operating Revenues | 2023 | $ | 7 |  | $ | (b) | $ | 25 |  | $ | (b)
rent and facility services |  | 2022 |  | 6 |  |  | (b) |  | 18 |  |  | (b)
Ameren Missouri and Ameren Illinois miscellaneous | Operating Revenues | 2023 | $ | (b) | $ | 2 |  | $ | (b) | $ | 2 |
support services |  | 2022 |  | (b) |  | (b) |  | (b) |  | 1 |
Total Operating Revenues |  | 2023 | $ | 9 |  | $ | 2 |  | $ | 27 |  | $ | 2 |
|  | 2022 |  | 8 |  |  | (b) |  | 25 |  |  | 1 |
Ameren Illinois power supply | Purchased Power | 2023 | $ | (a) | $ | 2 |  | $ | (a) | $ | 2 |
agreements with Ameren Missouri |  | 2022 |  | (a) |  | 2 |  |  | (a) |  | 7 |
Ameren Missouri and Ameren Illinois | Purchased Power | 2023 | $ | (b) | $ | 1 |  | $ | 1 |  | $ | 1 |
transmission services from ATXI |  | 2022 |  | 1 |  |  | (b) |  | 1 |  |  | (b)
Total Purchased Power |  | 2023 | $ | (b) | $ | 3 |  | $ | 1 |  | $ | 3 |
|  | 2022 |  | 1 |  |  | 2 |  |  | 1 |  |  | 7 |
Ameren Missouri and Ameren Illinois | Other Operations and Maintenance | 2023 | $ | (b) | $ | (b) | $ | (b) | $ | 2 |
rent and facility services |  | 2022 |  | (b) |  | 1 |  |  | (b) |  | 2 |
Ameren Services support services | Other Operations and Maintenance | 2023 | $ | 36 |  | $ | 33 |  | $ | 106 |  | $ | 101 |
agreement |  | 2022 |  | 38 |  |  | 36 |  |  | 109 |  |  | 103 |
Total Other Operations and |  | 2023 | $ | 36 |  | $ | 33 |  | $ | 106 |  | $ | 103 |
Maintenance |  | 2022 |  | 38 |  |  | 37 |  |  | 109 |  |  | 105 |
Money pool borrowings (advances) | (Interest Charges)/Other Income, Net | 2023 | $ | (b) | $ | (b) | $ | (b) | $ | (b)
|  | 2022 |  | (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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