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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2025, and December 31, 2024:
September 30, 2025December 31, 2024
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$3$67$—$32
Income taxes receivable from parent(b)
2—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 and nine months ended September 30, 2025 and 2024:
Three MonthsNine Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois		Ameren
Missouri		Ameren
Illinois
Ameren Missouri and Ameren IllinoisOperating Revenues2025$8 $(b)$23 $1 
rent and facility services
20248 (b)23 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2025$1 $(b)$1 $5 
support services20241 (b)2 1 
Total Operating Revenues2025$9 $(b)$24 $6 
20249 (b)25 1 
Ameren Missouri and Ameren IllinoisPurchased Power2025$2 $1 $7 $2 
transmission services from ATXI20243 1 7 2 
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2025$(b)$(b)$(b)$3 
rent and facility services
2024(b)(b)(b)(b)
Ameren Services support servicesOther Operations and Maintenance2025$42 $39 $130 $119 
agreement
202441 38 122 115 
Total Other Operations and2025$42 $39 $130 $122 
Maintenance202441 38 122 115 
Money pool interest(Interest Charges)/Other Income, Net2025$(b)$(b)$(b)$(b)
2024(b)(b)(3)(2)
Long-term debt, net - related parties(Interest Charges)2025$(1)$(b)$(2)$(b)
2024— — — — 
(a)Not applicable.
(b)Amount less than $1 million.