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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2023
Related Party Transactions [Abstract] |
Schedule of Related Party Electric Power Supply Agreements | The following table presents the specified performance period, average price per MWh, and amount of MWhs included in the agreements:
IPA Procurement Event | Performance Period | MWhs |  | Average Price per MWh
April 2019 | January 2020 – December 2021 | 288,000 |  | $ | 35 |
September 2019 | April 2020 – November 2021 | 170,800 |  | 29 |
September 2020 | September 2021 – November 2022 | 204,800 |  | 31 |
April 2021 | July 2022 – November 2022 | 33,600 |  | 34 |
September 2021 | January 2022 – September 2023 | 136,000 |  | 37 |
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 December 31, 2023 and 2022:
| 2023 |  |  | 2022
| Ameren Missouri | Ameren Illinois |  |  | Ameren Missouri | Ameren Illinois
Income taxes payable to parent(a) | $ | — |  | $ | 2 |  |  |  | $ | — |  | $ | 50 |
Income taxes receivable from parent(b) | 56 |  | 22 |  |  |  | 39 |  | — |
(a)Included in “Accounts payable – affiliates” on the balance sheet. (b)Included in “Accounts receivable – affiliates” on the balance sheet
Schedule of Capital Contributions | The following table presents cash capital contributions received from Ameren (parent) by Ameren Missouri and Ameren Illinois for the years ended December 31, 2023, 2022, and 2021:
| 2023 |  | 2022 |  | 2021 |
Ameren Missouri(a) | $ | — |  |  | $ | — |  |  | $ | 207 |  |
Ameren Illinois(a) | 91 |  |  | 15 |  |  | 262 |  |
(a)Includes capital contributions made as a result of the tax allocation agreement.
Schedule of Related Party Transactions | The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2023, 2022, and 2021. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.
Agreement | Income Statement Line Item |  |  |  | Ameren Missouri |  | Ameren Illinois
Ameren Missouri power supply agreements | Operating Revenues |  | 2023 | $ | 2 |  | $ | (a)
with Ameren Illinois |  |  | 2022 |  | 9 |  |  | (a)
|  |  | 2021 |  | 16 |  |  | (a)
Ameren Missouri and Ameren Illinois | Operating Revenues |  | 2023 |  | 32 |  |  | (b)
rent and facility services |  |  | 2022 |  | 25 |  |  | (b)
|  |  | 2021 |  | 26 |  |  | 1 |
Ameren Missouri and Ameren Illinois | Operating Revenues |  | 2023 |  | (b) |  | 2 |
miscellaneous support services |  |  | 2022 |  | (b) |  | 2 |
|  |  | 2021 |  | (b) |  | 5 |
Total Operating Revenues |  |  | 2023 | $ | 34 |  | $ | 2 |
|  |  | 2022 |  | 34 |  |  | 2 |
|  |  | 2021 |  | 42 |  |  | 6 |
Ameren Illinois power supply | Purchased Power |  | 2023 | $ | (a) | $ | 2 |
agreements with Ameren Missouri |  |  | 2022 |  | (a) |  | 9 |
|  |  | 2021 |  | (a) |  | 16 |
Ameren Missouri and Ameren Illinois | Purchased Power |  | 2023 |  | 2 |  |  | 1 |
transmission services from ATXI |  |  | 2022 |  | 1 |  |  | (b)
|  |  | 2021 |  | 4 |  |  | 1 |
Total Purchased Power |  |  | 2023 | $ | 2 |  | $ | 3 |
|  |  | 2022 |  | 1 |  |  | 9 |
|  |  | 2021 |  | 4 |  |  | 17 |
Ameren Missouri and Ameren Illinois | Other Operations and |  | 2023 | $ | (b) | $ | 3 |
rent and facility services | Maintenance |  | 2022 |  | (b) |  | 3 |
|  |  | 2021 |  | 1 |  |  | 4 |
Ameren Services support services | Other Operations and |  | 2023 |  | 148 |  |  | 138 |
agreement | Maintenance |  | 2022 |  | 150 |  |  | 141 |
|  |  | 2021 |  | 147 |  |  | 137 |
Total Other Operations and |  |  | 2023 | $ | 148 |  | $ | 141 |
Maintenance Expenses |  |  | 2022 |  | 150 |  |  | 144 |
|  |  | 2021 |  | 148 |  |  | 141 |
Money pool borrowings (advances) | (Interest Charges) |  | 2023 | $ | (b) | $ | (b)
| Other Income, Net |  | 2022 |  | (b) |  | (b)
|  |  | 2021 |  | (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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