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Related Party Transactions (Tables)
 3 Months Ended
Mar. 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 March 31, 2025, and December 31, 2024:
March 31, 2025December 31, 2024
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$—$32$—$32
Income taxes receivable from parent(b)
29—28—
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2025 and 2024:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2025$(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.