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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Electric Power Supply Agreements The following table presents the specified performance period, amount of MWhs, and average price per MWh included in the agreements:
IPA Procurement EventPerformance PeriodMWhsAverage Price per MWh
September 2020September 2021 – November 2022204,80031 
April 2021July 2022 – November 202233,60034 
September 2021January 2022 – September 2023136,00037 
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, 2024 and 2023:
20242023
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $32 $— $2 
Income taxes receivable from parent(b)
28 — 56 22 
(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, 2024, 2023, and 2022:
202420232022
Ameren Missouri(a)
$476 $— $— 
Ameren Illinois(a)
36 91 15 
(a)Includes capital contributions made as a result of the tax allocation agreement.
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2024, 2023, and 2022. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.
AgreementIncome Statement Line ItemAmeren
Missouri		Ameren
Illinois
Ameren Missouri power supply agreementsOperating Revenues2024$— $(a)
with Ameren Illinois20232 (a)
  20229 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues202431 1 
rent and facility services202332 (b)
  202225 (b)
Ameren Missouri and Ameren IllinoisOperating Revenues20242 2 
miscellaneous support services2023(b)2 
2022(b)2 
Total Operating Revenues2024$33 $3 
202334 2 
  202234 2 
Ameren Illinois power supplyPurchased Power2024$(a)$— 
agreements with Ameren Missouri2023(a)2 
  2022(a)9 
Ameren Missouri and Ameren IllinoisPurchased Power20249 2 
transmission services from ATXI20232 1 
20221 (b)
Total Purchased Power2024$9 $2 
20232 3 
20221 9 
Ameren Missouri and Ameren IllinoisOther Operations and 2024$1 $1 
rent and facility servicesMaintenance2023(b)3 
2022(b)3 
Ameren Services support servicesOther Operations and2024169 158 
agreementMaintenance2023148 138 
  2022150 141 
Total Other Operations and2024$170 $159 
Maintenance Expenses2023148 141 
  2022150 144 
Money pool borrowings (advances)(Interest Charges)2024$(4)$(b)
Other Income, Net2023(b)(b)
  2022(b)(b)
Long-term debt, net - related parties(Interest Charges)2024(b)(b)
2023(a)(a)
2022(a)(a)
(a)Not applicable.
(b)Amount less than $1 million.