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Related Party Transactions (Tables)
 12 Months Ended
Dec. 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 December 31, 2025 and 2024:
20252024
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $4 $— $32 
Income taxes receivable from parent(b)
3 7 28 — 
(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, 2025, 2024, and 2023:
202520242023
Ameren Missouri(a)
$28 $476 $— 
Ameren Illinois(a)
2 36 91 
(a)Includes capital contributions made as a result of the tax allocation agreement.
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2025, 2024, and 2023. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.
AgreementIncome Statement Line ItemAmeren
Missouri		Ameren
Illinois
Ameren Missouri power supply agreementsOperating Revenues2025$— $(a)
with Ameren Illinois2024— (a)
  20232 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues202531 1 
rent and facility services202431 1 
  202332 (b)
Ameren Illinois interconnection agreementOperating Revenues2025(a)1 
with Ameren Missouri2024(a)(b)
2023(a)— 
Ameren Missouri and Ameren IllinoisOperating Revenues20251 5 
miscellaneous support services20242 2 
2023(b)2 
Total Operating Revenues2025$32 $7 
202433 3 
  202334 2 
Ameren Illinois power supplyPurchased Power2025$(a)$— 
agreements with Ameren Missouri2024(a)— 
  2023(a)2 
Ameren Missouri interconnection agreementPurchased Power20251 (a)
with Ameren Illinois2024(b)(a)
2023— (a)
Ameren Missouri and Ameren IllinoisPurchased Power202510 2 
transmission services from ATXI20249 2 
20232 1 
Total Purchased Power2025$11 $2 
20249 2 
20232 3 
Ameren Missouri and Ameren IllinoisOther Operations and 2025$(b)$3 
rent and facility servicesMaintenance20241 1 
2023(b)3 
Ameren Services support servicesOther Operations and2025177 164 
agreementMaintenance2024169 158 
  2023148 138 
Total Other Operations and2025$177 $167 
Maintenance Expenses2024170 159 
  2023148 141 
Money pool borrowings (advances)(Interest Charges)2025$(1)$1 
Other Income, Net2024(4)(b)
  2023(b)(b)
Long-term debt, net - related parties(Interest Charges)2025$(3)$(b)
2024(b)(b)
2023(a)(a)
(a)Not applicable.
(b)Amount less than $1 million.