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Related Party Transactions
 3 Months Ended
Mar. 31, 2025
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS RELATED-PARTY TRANSACTIONS
In the ordinary course of business, Ameren Missouri and Ameren Illinois have engaged in, and may in the future engage in, affiliate transactions. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between Ameren’s subsidiaries are reported as affiliate transactions on their individual financial statements, but those transactions are eliminated in consolidation for Ameren’s consolidated financial statements. For a discussion of material related-party agreements and money pool agreements, see Note 13 – Related-party Transactions and Note 4 – Short-term Debt and Liquidity under Part II, Item 8, of the Form 10-K.
Support Services Agreements
Ameren Missouri and Ameren Illinois had long-term receivables included in “Other assets” from Ameren Services of $27 million and $30 million, respectively, as of March 31, 2025, and $29 million and $32 million, respectively, as of December 31, 2024, related to Ameren Services’ allocated portion of Ameren’s pension and postretirement benefit plans.
Tax Allocation Agreement
See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for a discussion of the tax allocation agreement. The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of March 31, 2025, and December 31, 2024:
March 31, 2025December 31, 2024
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$—$32$—$32
Income taxes receivable from parent(b)
29—28—
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Effects of Related-party Transactions on the Statement of Income
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2025 and 2024:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2025$(a)$(a)
agreements with Ameren Illinois
2024(b)(a)
Ameren Missouri and Ameren IllinoisOperating Revenues2025$7 $(b)
rent and facility services
20247 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2025$(b)$2 
support services2024(b)1 
Total Operating Revenues2025$7 $2 
20247 1 
Ameren Illinois power supplyPurchased Power2025$(a)$(a)
agreements with Ameren Missouri
2024(a)(b)
Ameren Missouri and Ameren IllinoisPurchased Power2025$3 $(b)
transmission services from ATXI20242 (b)
Total Purchased Power2025$3 $(b)
20242 (b)
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2025$(b)$1 
rent and facility services
2024(b)(b)
Ameren Services support servicesOther Operations and Maintenance2025$44 $40 
agreement
202438 37 
Total Other Operations and2025$44 $41 
Maintenance202438 37 
Money pool interest(Interest Charges)/Other Income, Net2025$(b)$(b)
2024(3)(2)
Long-term debt, net - related parties(Interest Charges)2025(b)(b)
2024— — 
(a)Not applicable.
(b)Amount less than $1 million.