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Related Party Transactions
 3 Months Ended
Mar. 31, 2024
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 $28 million and $31 million, respectively, as of March 31, 2024, and $31 million and $34 million, respectively, as of December 31, 2023, related to Ameren Services’ allocated portion of Ameren’s pension and postretirement benefit plans.
In December 2023, ATXI placed in service a transmission operations control center. Rental revenues received by ATXI from Ameren Services associated with this facility are affiliate transactions and are eliminated in consolidation for Ameren’s consolidated financial statements. Ameren Services’ rental expenses incurred are subsequently allocated to Ameren Missouri and Ameren Illinois as part of the Ameren Services support agreement.
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, 2024, and December 31, 2023:
March 31, 2024December 31, 2023
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$—$43$—$2
Income taxes receivable from parent(b)
32—5622
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Effects of Related-party Transactions on the Statement of Income
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2024 and 2023:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2024$(b)$(a)
agreements with Ameren Illinois
2023(b)(a)
Ameren Missouri and Ameren IllinoisOperating Revenues2024$7 $(b)
rent and facility services
202310 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2024$(b)$1 
support services2023(b)(b)
Total Operating Revenues2024$7 $1 
202310 (b)
Ameren Illinois power supplyPurchased Power2024$(a)$(b)
agreements with Ameren Missouri
2023(a)(b)
Ameren Missouri and Ameren IllinoisPurchased Power2024$2 $(b)
transmission services from ATXI2023(b)(b)
Total Purchased Power2024$2 $(b)
2023(b)(b)
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2024$(b)$(b)
rent and facility services
2023(b)2 
Ameren Services support servicesOther Operations and Maintenance2024$38 $37 
agreement
202335 35 
Total Other Operations and2024$38 $37 
Maintenance202335 37 
Money pool interest(Interest Charges)/Other Income, Net2024$(3)$(2)
2023(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.